To see the other types of publications on this topic, follow the link: Intrusive complex.
Dissertations / Theses on the topic 'Intrusive complex'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Intrusive complex.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Johannesen, A. (Anne). "Orthomagmatic Ni-Cu mineralisation in the Palaeoproterozoic Johan Petersen Intrusive Centre, Ammassalik Intrusive Complex, South-East Greenland." Master's thesis, University of Oulu, 2016. http://urn.fi/URN:NBN:fi:oulu-201604191511.
Full textAbstract:
The Palaeoproterozoic Johan Petersen Intrusive Centre (JPIC) formed as a continental arc at the North Atlantic Craton margin during the formation of the ca. 1.9 Ga Nagssugtoqidian Orogen (NO) in SE Greenland. Magmatic Ni-Cu deposits in the coeval Trans-Hudson and Svecofennian Orogens (THO and SFO) make the NO the primary target for Ni-Cu deposits in Greenland. Using mapping, petrography, geochemistry, and multiple sulphur isotope geochemistry, this thesis deals with the formation of the JPIC and related mineralisation, and compares it with previously discovered Ni-Cu mineralisation in the NO and Trans-Hudson and Svecofennian Orogens.
The JPIC formed from an early series of dioritic to granitic magmas intruding into paragneiss under granulite facies conditions. A mafic series of gabbroic rocks intruded into both the paragneiss and the earlier felsic series rocks. Late mafic-ultramafic sheets and magmatic breccias intruded predominantly into the mafic series rocks. Two episodes of intrusion by mafic-ultramafic stringers happened when the felsic and mafic series rocks were semi-solid. Late granite likely formed from back-veining of residual melts. Uplift during orogenesis caused retrograde amphibolite facies metamorphism, and late hydrothermal alteration of both intrusive rocks and their mineralisation took place under temperature conditions corresponding to amphibolite- to mid greenschist facies.
The mineralised rocks in the JPIC occur as contact mineralisation between the intrusive rocks and the adjacent paragneiss, as mineralisation in the stringers mingling with the mafic series rocks, and as accumulated sulphide liquids in the later sheets and breccias. In the contact style mineralisation, sulphides are disseminated, network-like or semi- massive and show S isotopic compositions indicating a Palaeoproterozoic sedimentary sulphur source. Ni and Cu contents in the sulphide phase are low. Sulphides in the mineralised stringers and mafic-ultramafic sheets and breccias are disseminated to network-like, and have mantle-like isotopic compositions of sulphur. The ultramafic sheets and breccias have higher Ni-Cu contents and tenors and currently form the primary targets. The JPIC mineralisation is similar to that in the Kotalahti-Vammala belt of the SFO, and although sub-economic at the moment, possible existence of deeper-seated sulphides would give the area an upside potential for more discoveries.
2
Allan, Murray Masson. "Hydrothermal processes in the Mount Leyshon Intrusive Complex, Australia : microanalytical insights." Thesis, University of Leeds, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.427766.
Full text
3
Tarnocai, David M. "Petrogenesis of the Late Archean Lac Simard Intrusive Complex, Pontiac Subprovince, Quebec." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0001/MQ46612.pdf.
Full text
4
Cole, Shawn Edward. "Non-intrusive detection of concealed weapons by excitation of their complex natural resonances." Thesis, Manchester Metropolitan University, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.591099.
Full textAbstract:
A novel set of techniques have been developed and utilized for the detection and identification of concealed objects such as guns and knives. It is envisaged that such a device would be deployed in sensitive security areas such as those found in airports, banks and conferences. Identification of weapons that are most likely to be concealed on-body, such as guns and knives has been demonstrated in an anechoic environment at stand-off distances. The identification of concealed weapons such as guns and knives relies on the excitation of these objects complex natural resonances (CNR). The CNR are excited by an incident Ultra-Wide band (UWB) electromagnetic pulse (or by frequency domain pulse synthesis), were the equivalent wavelengths are commensurate to the linear dimensions of the object and is thus closely related to, the comprehensively studied and reported, Mie scattering for a conducting sphere. An object's CNR spectrum is strongly independent of the orientation of the object, and therefore the CNR may be used as an aspect independent identification system. Initial experiments and finite element simulations clearly demonstrated the limitations of a bi-static radar method and a different approach was investigated which uses an phased array of UWB antennae consisting of multiple transceivers. With a phased array antenna system it is possible to spatially locate metallic object(s) and identify them based upon their characteristic CNR. Spatial location of conducting objects is achieved by locating significant 'Late Time Response' (LTR). Once an object is spatially located by the presence of a significant L TR, the transient may then he analysed to reveal the object's CNR and identification can then be made. The aspect independent CNR of an object are more prominent and obtainable when using a phased array system in comparison to a conventional hi-static radar setup.
5
Olianti, Camille Andrea Elisa. "A low - δ 18 O intrusive breccia from the Koegel Fontein complex, South Africa." Master's thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/20270.
Full textAbstract:
Includes bibliographical referencesThe ~135 Ma Koegel Fontein complex, 350 km north of Cape Town, has rocks with abnormally low δ 18 O values, as low as - 5.2 ‰. The rocks with the lowest δ 18 O values belong to an intrusive breccia and have a fine - grained, black matrix. The silica content of these breccia rocks ranges between 44 - 68 wt %, their whole - rock δ 18 O values vary between - 5.2 ‰ and +1.8 ‰ , and their water content is between 0.2 - 1.1 wt %. The major and trace element composition of the breccia rocks is consistent with them containing variable proportions of bentonite, alkali basalt, gneiss, and epidote - and xenolith - rich material. Mapping indicates that the initial intrusion was an alkali basalt dyke and a bostonite dyke that were then intruded by two breccia plugs that extended along the planes of weakness created by the pre - existing dykes, forming two sub - parallel breccia dykes. The water content of the breccia rocks is low (average <1.0 wt %) and is consistent with interaction with fluids at a relatively high temperature (> 300°C). These fluids interacted with the rocks from both dykes and are responsible for their 18 O - depletion. On the basis of the O - and H - isotope composition of the breccia rocks, the δ 18 O value calculated for the fluids in equilibrium with the breccia rock s is approximately - 10.8 ± 0.2 ‰. This low δ 18 O value of the meteoric fluids is too low for the low latitude and warm climate at ~135 Ma and indicates that 18 O - depletion at Koegel Fontein predates the intrusion of the complex in the Cretaceous. It is possible that low - δ 18 O fluids circulated through the country rock during the Pan African when crustal reworking enabled deep circulation of surface water. This period of crustal reworking coincides with a 'Snowball Earth' event and would have been accompanied by 18 O - depleted meteoric water. In the Cretaceous, it is assumed that a mantle plume heated the crust, causing dehydration before partial melting of the crust. The initial low - δ 18 O fluids are effectively metamorphic fluids in equilibrium with the rock. It i s proposed that the initial loss of these fluids became explosive. These fluids migrated along the pre - existing alkali basalt and bentonite dykes, incorporating fragments of alkali basalt, bostonite, and country rock gneiss. This xenolith - rich fluidised material was then emplaced rapidly into the crust
6
Meenakshi, Sundaram Vignesh. "Developing Bleeding-edge microservice solutions for complex problems : Non-intrusive technology in Walking Meetings." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-214670.
Full textAbstract:
The last decade has seen an emergence of various types of cloud services and development frameworks offered by leading companies in the software industry. While each of these services has been used to solve specific tasks, their specifications have changed over time as they have matured. Therefore, integrating these components to solve a whole new task tends to get tricky due to their incompatible and experimental nature. While some technology components might continue to be developed, others might deprecate. In this thesis, using a user-centered design and agile development approach, we have attempted to develop a cloud solution using microservice software architecture by integrating state-of-the-art technology components to solve a totally new task of providing a non-intrusive technology experience during walking meetings. We present our results based on interaction with the research group, user studies as a part of the research study “Movement of the mind”, and expectations of the working prototype within the context of walking meetings. We also present the features of the prototype and our motivation for choosing the tools to develop them. Finally, we discuss the development challenges faced during our attempt and conclude whether it is plausible to integrate various components of bleeding-edge technology to solve complex real-life problems or rather wait for these technologies to mature.Under det senaste decenniet har marknaden erbjudits en mängd olika typer av molntjänster och utvecklings-ramverk framtagna av ledande företag inom mjukvaruindustrin. Dessa tjänster har ofta använts för att lösa specifika uppgifter. Olika komponenterna som ingår i dessa specifika lösningar har med tiden utvecklats ändrats allteftersom de har mognat. Att integrera dessa komponenter för att lösa en helt ny uppgift tenderar därför att bli svårt på grund av deras instabila, inkompatibla och experimentella karaktär. Medan vissa teknikkomponenter kan fortsätta att utvecklas kan andra avstanna och utgå. Vi har närmat oss detta problemområde genom agil och iterativ utveckling samt användar-centrerad design-metod. En moln-baserad lösning som bland annat integrerat bleeding-edge teknikkomponenter har utvecklats och utvärderats med syfte att ge en icke-påträngande tekniskt support för gå-möten. De resultat som här presenteras och diskuteras baseras på interaktion med forskargruppen inom projektet "Med rörelse i tankarna", användarstudier och användartesteter i fält på olika arbetsplatser där den prototyp som utvecklats sökt motsvara användarnas utryckta förväntningar på tekniskt support för gångmöten. Vi diskuterar också prototypens egenskaper och vår motivation för val av metoder för att utveckla den. Slutligen diskuterar vi de utvecklingsutmaningar vi ställdes inför under vårt försök och om det är rimligt att integrera olika bleeding-edge komponenter för att lösa komplexa verkliga problem eller huruvida man hellre bör vänta på att dessa teknologier nått en stabilare mognadsgrad.
7
Dodd, Zachary Caleb. "Petrogenesis and rare earth element economic potential of Pilot Knob, a Pliocene (?) alkaline intrusive complex in the Togwotee Pass region, northwestern Wyoming (U.S.A)." Thesis, Kansas State University, 2015. http://hdl.handle.net/2097/20380.
Full textAbstract:
Master of ScienceGeology
Matthew E. Brueseke
Previous K-Ar dating and petrography (Obradovich, 1978) have identified Pilot Knob as an ~3.4 (±0.06) Ma alkaline intrusive body. Bulk rock geochemistry obtained via XRF from four samples of Pilot Knob verifies the transitionally alkaline composition of the body, and new REE data also show enriched La, Ce, and Nd concentrations, consistent with rare earth element (REE) enrichment. Given the increased demand for REEs over the past ~30 years and China accounting for > 90% of global REE production (Kynicky, et al. 2012), it is important to evaluate new domestic REE sources. This includes those associated with alkaline intrusive complexes, because they are demonstrated to host high REE concentrations (Verplanck and Van Gosen, 2011). Such alkaline igneous occurrences show complex mineralization and consist of many minerals containing substitutional REEs (Mariano and Mariano, 2012). This study evaluates the petrogenesis and mineralogy of Pilot Knob (and a secondary field site, Wildcat Hill) and determines whether the intrusive body is consistent with an economically viable REE deposit. Additionally, given its geographic location and Pliocene faulting and magmatism (e.g., predating the earliest volcanism at Yellowstone), Pilot Knob may represent one of the earliest structural manifestations of the “arrival” of the Yellowstone hotspot at its current location under the North American lithosphere or magmatism associated with lithospheric extension to the south at the Leucite Hills, WY. Inspection of satellite imagery, which has been verified with field data, shows that other intrusive igneous bodies (e.g. - Wildcat Hill) exist, along an apparent normal fault zone along strike with a major extensionally related fault zone documented ~10 km northwest of Pilot Knob. Clinopyroxene geobarometry, coupled with Nd isotope data (εNd[subscript 3.5Ma] = -21.9), indicates that Pilot Knob formed via a multi-stage development history that initiated with melting of ancient lithospheric mantle, where crystallization occurred at a variety of depths. As an alkaline intrusive complex, Pilot Knob has been identified, based on mineral and chemical compositions, as a kersantite, and has been found to contain approximately 600 ppm total light-rare earth element ore lode with ~150 ppm Nd, ~175 ppm La, and ~338 ppm Ce enrichment. Apatite was found to be the primary REE-bearing mineral via petrography and electron microprobe analyses. Based on current technology and processing methods, REE concentrations were not found to be significant enough to denote an economically viable REE ore deposit at Pilot Knob.
8
Haq, Anwar Ul [Verfasser], Hans-Arno [Akademischer Betreuer] Jacobsen, Georg [Gutachter] Carle, and Hans-Arno [Gutachter] Jacobsen. "Appliance Event Detection for Non-Intrusive Load Monitoring in Complex Environments / Anwar Ul Haq ; Gutachter: Georg Carle, Hans-Arno Jacobsen ; Betreuer: Hans-Arno Jacobsen." München : Universitätsbibliothek der TU München, 2018. http://d-nb.info/1176107224/34.
Full text
9
Chitt, Mira. "Simultaneous measurements of velocity and temperature by non-intrusive optical methods in a complex geometry : Application to the upper plenum of the sodium cooled reactor ASTRID." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS598.
Full textAbstract:
Des problématiques thermo-hydrauliques du plénum supérieur d'ASTRID ne peuvent être étudiés à partir du retour d’expérience des réacteurs et des simulations numériques puisque les codes de calcul ne permettent pas de modéliser ces problèmes avec une confiance suffisante. Pour valider les approches numériques et la conception d'ASTRID, il a été identifié des besoins en maquettes expérimentales. La maquette MICAS représentative du plenum supérieur a été conçue à cette fin. Pour valider les codes numériques, les champs de vitesse et de température sont très importants. Si la mesure de champ de vitesse par PIV est fréquemment utilisée au LTHC, la méthode LASER Induced Fluorescence (LIF) a nécessité de développement et mise en œuvre. La fluorescence induite par laser consiste en l'émission spontanée de photons par les molécules d'un traceur, à la suite de l'absorption d'un rayonnement laser. Des expériences d'étalonnage de LIF à un colorant ont été réalisées pour étudier leur réponse en fluorescence. La LIF à deux colorants est très intéressante aussi. PIV et LIF à deux colorants sont appliquées sur une nouvelle installation expérimentale (géométrie complexe à deux jets) conçue pendant cette thèse afin de permettre une représentative de la maquette MICASThermal hydraulic problems of the upper plenum of ASTRID cannot be studied from the feedback of the reactors and the numerical simulations since the codes do not make it possible to model these problems with a sufficient confidence. To validate the numerical approaches and the design of ASTRID, needs have been identified for experimental models. The representative MICAS model of the upper plenum has been designed for this purpose. To validate the numeric codes, the velocity and temperature fields are mustbe measured. While PIV technique is frequently used at the LTHC, the LASER Induced Fluorescence (LIF) method required development and implementation. The principle of LIF is based on the spontaneous emission of photons by the molecules of a tracer, as a result of the absorption of laser radiation. LIF calibration experiments with a dye were performed to study their fluorescence response. The LIF with two dyes is very interesting too. PIV and LIF with two dyes are applied on a new experimental installation (complex geometry with two jets) conceived during this thesis in order to allow a representative of the model MICAS
10
Congedo, Pietro Marco. "Contributions to the reliability of numerical simulations in fluid mechanics. Application to the flow simulation of thermodynamically complex gases." Habilitation à diriger des recherches, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00940088.
Full textAbstract:
At the interface of physics, mathematics, and computer science, Uncertainty Quanti cation (UQ) aims at developing a more rigorous framework and more reliable methods to characterize the impact of uncertainties on the prediction of Quantities Of Interest (QOI). Despite signi cant improvements done in the last years in UQ methods for Fluid Mechanics, there is nonetheless a long way to go before there can be talk of an accurate prediction when considering all the numerous sources of uncertainties of the physical problem (boundary conditions, physical models, geometric tolerances, etc), in particular for shock-dominated problems. This manuscript illustrates my main contributions for improving the reliability of the numerical simulation in Fluid Mechanics: i) the development of e cient and exible schemes for solving at low-cost stochastic partial di erential equations for compressible ows, ii) various works concerning variancebased and high-order analysis, iii) the design of some low-cost techniques for the optimization under uncertainty. The application of interest is the robust design of turbines for Organic Rankine Cycles (ORC). Some contributions to the numerical ow prediction of the thermodynamically complex gases involved in ORC will be presented. This manuscript is divided in two parts. In the rst part, some intrusive algorithms are introduced that feature an innovative formulation allowing the treatment of discontinuities propagating in the coupled physical/stochastic space for shock-dominated compressible ows. Then, variance and higher-order based decompositions are described, that could alleviate problems with large number of uncertainties by performing a dimension reduction with an improved control. Some ANOVAbased analyses are also applied to several ows displaying various types of modeling uncertainties, be it cavitation, thermodynamic or turbulence modeling. Two algorithms for handling stochastic inverse problems are then introduced for improving input uncertainty characterization by directly using experimental data. Finally, robust-optimization algorithms are introduced, that are e cient when dealing with a large number of uncertainties, relying on di erent formulations, i.e. with decoupled/ coupled approaches between the stochastic and the optimization solvers. The second part is devoted to the study of dense gas ow in ORC-cycles, which represent a highly demanding eld of application as far as ow simulation reliability is concerned. The numerical ingredients necessary for this kind of simulation are described. Then, some recent results are illustrated : i) high- delity turbine computations; ii) a feasibility study concerning the appearance and the occurrence of a Rarefaction Shock Wave, using experimental data and di erent operating conditions (in monophasic and two-phase ows); iii) a stochastic study concerning the thermodynamic model uncertainties. This set of research works has produced several papers in international journals and peer-reviewed conferences.
11
Stewart, Nick. "Doctorate in Clinical Psychology : main research portfolio." Thesis, University of Bath, 2018. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.761009.
Full textAbstract:
Critical Review of the LiteratureCan Borderline Personality Disorder be treated effectively in forensic settings? A systematic reviewBorderline Personality Disorder (BPD) is a common diagnosis in forensic settings. Certain features of BPD, such as impulsivity and emotional dysregulation, can create a vulnerability to impulsive acts. The condition is also associated with poor mental and physical health, making the treatment of BPD and its clinical features an important goal in forensic settings. This paper reviews evidence for the effectiveness of treating BPD and its symptoms using psychological approaches in forensic settings. A systematic search found 2913 papers, of which 13 met the inclusion criteria. The papers reported nine separate studies (six controlled) that implemented four distinct interventions, often adapted for particular forensic settings. Improvements in overall BPD symptomatology and specific BPD symptoms were reported for all types of intervention, although few differences in outcome between intervention and control groups were found. There were also reported improvements in BPD-related behaviours, but data on offending behaviour were absent. Heterogeneity in study quality and design makes it challenging to draw any firm conclusions about the effectiveness of any one form of treatment over another, nor about which treatment may best suit a particular setting. Further randomised controlled trials are needed to answer these questions. Service Improvement ProjectEvaluation of a brief educational intervention for clinical staff aimed at promoting trauma-informed approaches to careThere is growing evidence that trauma plays an important role in the aetiology of severe and enduring mental health problems. Yet staff can be reluctant to ask patients about trauma for reasons such as anxiety about harming patients and limited access to training. Where services have adopted trauma-informed approaches (TIAs) to mental health care (i.e., considering the ways in which trauma affects individuals when planning and delivering services), improved clinical outcomes have been observed. With this in mind, a new educational video was developed for mental health staff at an NHS trust. The video was intended to be (a) brief (10 minutes); (b) contemporary and engaging; and (c) accessible using computers, smartphones and tablets. Forty-one multidisciplinary staff viewed the video. Quantitative and qualitative evaluation indicated improvements in self-reported knowledge and confidence with regard to trauma, and a decrease in worries with regard to asking patients about such experiences. Participants found the video to be enjoyable, understandable and informative. Importantly, many indicated that it spurred them to further action, such as further training and asking patients about possible trauma. These findings indicate that a video of this type can offer an important ‘taster’ of trauma-related learning, constituting an important step towards embedding trauma-informed ways of working at a service. Main Research ProjectThe Role of Intrusive Imagery in Hoarding DisorderThe cardinal feature of Hoarding Disorder (HD) is persistent difficulty discarding possessions, with the resulting clutter compromising the intended use of living areas. Within the dominant cognitive-behavioural model of hoarding (Frost & Hartl, 1996), hoarding behaviours are positively and negatively reinforced in the context of certain object-related beliefs. Available treatments for HD have so far yielded modest outcomes, indicating a need for new approaches. Intrusive imagery has so far been neglected in HD research, despite the frequency of trauma in the histories of people with the condition. To address this, 27 individuals who met the DSM-5 criteria for HD and 28 community controls (CCs) were interviewed about their everyday experiences of mental imagery. Participants were also asked about the images they experienced during two recent real-life examples of actual or attempted discard of (1) an object of low subjective value; and (2) an object of high subjective value. Everyday imagery in the HD group commonly reflected themes of illness, death and reminiscence. Imagery in HD participants tended to carry negative emotional valence in comparison with CCs, and was associated with greater interference in everyday life and attempts to avoid the imagery. HD participants reported more negative experiences of intrusive imagery in comparison with CCs during recent episodes of discarding objects of low subjective value. However, HD participants experienced positive imagery when discarding, or trying to discard, high value objects. These findings indicate that although people with HD frequently report traumatic histories, this is not reflected in the everyday imagery that they experience. There is some evidence to suggest that the negative and positive memories experienced in relation to low and high value objects may aid our understanding of discarding and saving behaviour in HD. The theoretical and clinical implications of these findings are further discussed.
12
Abarca, Cameo Elena. "Seawater intrusion in complex geological environments." Doctoral thesis, Universitat Politècnica de Catalunya, 2006. http://hdl.handle.net/10803/6243.
Full textAbstract:
Modelling seawater intrusion (SWI) has evolved from a tool for understanding to a water management need. Yet, it remains a challenge. Difficulties arise from the assessment of dispersion coefficients and the complexity of natural systems that results in complicated aquifer geometries and heterogeneity in the hydraulic parameters. Addressing such difficulties is the objective of this thesis. Specifically, factors that may affect the flow and transport in coastal aquifers and produce heterogeneous salinity distributions are studied.First, a new paradigm for seawater intrusion is proposed since the current paradigm (the Henry problem) fails to properly reproduce observed SWI wedges. Mixing is represented by means of a velocity dependent dispersion tensor in the new proposed problem. Thereby, we denote it as "dispersive Henry problem". SWI is characterized in terms of the wedge penetration, width of the mixing zone and influx of seawater. We find that the width of the mixing zone depends basically on dispersion, with longitudinal and transverse dispersion controlling different parts of the mixing zone but displaying similar overall effects. The wedge penetration is mainly controlled by the horizontal permeability and by the geometric mean of the dispersivities. Transverse dispersivity and the geometric mean of the hydraulic conductivity are the leading parameters controlling the amount of salt that enters the aquifer.
Second, the effect of heterogeneity was studied by incorporating heterogeneity in the hydraulic permeability into the modified Henry problem. Results show that heterogeneity causes the toe to recede while increases both the width and slope of the mixing zone. The shape of the interface and the saltwater flux depends on the distribution of the permeability in each realization. However, the toe penetration and the width of the mixing zone do not show large fluctuations. Both variables are satisfactorily reproduced, in cases of moderate heterogeneity, by homogeneous media with equivalent permeability and either local or effective dispersivities.
Third, the effect of aquifer geometry in horizontally large confined aquifers was analyzed. Lateral slope turned out to be a critical factor. Lateral slopes in the seaside boundary of more than 3% cause the development of horizontal convection cells. The deepest zones act as preferential zones for seawater to enter the aquifer and preferential discharging zones are developed in the upwards lateral margins. A dimensionless number, Nby, has been defined to estimate the relative importance of this effect.
All these factors can be determinant to explain the evolution of salinity in aquifers such as the Main aquifer of the Llobregat delta. Finally, a management model of this aquifer is developed to optimally design corrective measures to restore the water quality of the aquifer. The application of two different optimization methodologies, a linear and a non-linear optimization method, allowed (1) to quantify the hydraulic efficiency of two potential corrective measures: two recharge ponds and a seawater intrusion barrier; (2) to determine the water necessary to be injected in each of these measures to restore the water quality of the aquifer while minimizing changes in the pumping regime and (3) to assess the sustainable pumping regime (with and without the implementation of additional measures) once the water quality has been restored. Shadow prices obtained from linear programming become a valuable tool to quantify the hydraulic efficiency of potential corrective measures to restore water quality in the aquifer.
13
Panichprecha, Sorot. "Abstracting and correlating heterogeneous events to detect complex scenarios." Queensland University of Technology, 2009. http://eprints.qut.edu.au/26737/.
Full textAbstract:
The research presented in this thesis addresses inherent problems in signaturebased intrusion detection systems (IDSs) operating in heterogeneous environments. The research proposes a solution to address the difficulties associated with multistep attack scenario specification and detection for such environments. The research has focused on two distinct problems: the representation of events derived from heterogeneous sources and multi-step attack specification and detection. The first part of the research investigates the application of an event abstraction model to event logs collected from a heterogeneous environment. The event abstraction model comprises a hierarchy of events derived from different log sources such as system audit data, application logs, captured network traffic, and intrusion detection system alerts. Unlike existing event abstraction models where low-level information may be discarded during the abstraction process, the event abstraction model presented in this work preserves all low-level information as well as providing high-level information in the form of abstract events. The event abstraction model presented in this work was designed independently of any particular IDS and thus may be used by any IDS, intrusion forensic tools, or monitoring tools. The second part of the research investigates the use of unification for multi-step attack scenario specification and detection. Multi-step attack scenarios are hard to specify and detect as they often involve the correlation of events from multiple sources which may be affected by time uncertainty. The unification algorithm provides a simple and straightforward scenario matching mechanism by using variable instantiation where variables represent events as defined in the event abstraction model. The third part of the research looks into the solution to address time uncertainty. Clock synchronisation is crucial for detecting multi-step attack scenarios which involve logs from multiple hosts. Issues involving time uncertainty have been largely neglected by intrusion detection research. The system presented in this research introduces two techniques for addressing time uncertainty issues: clock skew compensation and clock drift modelling using linear regression. An off-line IDS prototype for detecting multi-step attacks has been implemented. The prototype comprises two modules: implementation of the abstract event system architecture (AESA) and of the scenario detection module. The scenario detection module implements our signature language developed based on the Python programming language syntax and the unification-based scenario detection engine. The prototype has been evaluated using a publicly available dataset of real attack traffic and event logs and a synthetic dataset. The distinct features of the public dataset are the fact that it contains multi-step attacks which involve multiple hosts with clock skew and clock drift. These features allow us to demonstrate the application and the advantages of the contributions of this research. All instances of multi-step attacks in the dataset have been correctly identified even though there exists a significant clock skew and drift in the dataset. Future work identified by this research would be to develop a refined unification algorithm suitable for processing streams of events to enable an on-line detection. In terms of time uncertainty, identified future work would be to develop mechanisms which allows automatic clock skew and clock drift identification and correction. The immediate application of the research presented in this thesis is the framework of an off-line IDS which processes events from heterogeneous sources using abstraction and which can detect multi-step attack scenarios which may involve time uncertainty.
14
Clark, Christopher R. "Design of Efficient FPGA Circuits For Matching Complex Patterns in Network Intrusion Detection Systems." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5137.
Full textAbstract:
The objective of this research is to design and develop a reconfigurable string matching co-processor using field-programmable gate array (FPGA) technology that is capable of matching thousands of complex patterns at gigabit network rates for network intrusion detection systems (NIDS). The motivation for this work is to eliminate the most significant bottleneck in current NIDS software, which is the pattern matching process. The tasks involved with this research include designing efficient, high-performance hardware circuits for pattern matching and integrating the pattern matching co-processor with other NIDS components running on a network processor. The products of this work include a system to translate standard intrusion detection patterns to FPGA pattern matching circuits that support all the functionality required by modern NIDS. The system generates circuits efficient enough to enable the entire ruleset of a popular NIDS containing over 1,500 patterns and 17,000 characters to fit into a single low-end FPGA chip and process data at an input rate of over 800 Mb/s. The capacity and throughput both scale linearly, so larger and faster FPGA devices can be used to further increase performance. The FPGA co-processor allows the task of pattern matching to be completely offloaded from a NIDS, significantly improving the overall performance of the system.
15
Downs-Rose, Katrina. "The geology of the Roundstone intrusion, Connemara, Ireland." Thesis, University of Glasgow, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.258764.
Full text
16
Lu, Chunhui. "Mixing in complex coastal hydrogeologic systems." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39600.
Full textAbstract:
The mixing zone developed at freshwater-seawater interface is one of the most important features in complex coastal hydrogeologic systems, which controls subsurface flow and reactive transport dynamics. Freshwater-seawater mixing-zone development is influenced by many physical and chemical processes, such as characteristics of geologic formation, hydrodynamic fluctuations of groundwater and seawater levels, fluid-rock interactions, and others. Wide mixing zones have been found in many coastal aquifers all over the world. However, the mechanisms responsible for wide mixing zones are not well understood. In this thesis, two hypotheses were proposed to explain wide mixing zones in coastal aquifers: (1) kinetic mass transfer coupled with transient conditions, which create the movement of the mixing zone, may widen mixing zones; and (2) aquifer stratification may widen the mixing zone.
The hypotheses were tested by both multiscale numerical simulations and laboratory experiments. Numerical simulations were based on a variable-density groundwater model by varying mass transfer parameters, including immobile porosity, mobile porosity, and mass transfer coefficient, and the hydraulic conductivity contrast between aquifer layers. Laboratory experiments were conducted in a quasi-two-dimensional tank, where real beach sands were installed and foodstuff dyes were used to visualize the development of freshwater-seawater mixing zone. Major conclusions included (1) the mixing zone can be significantly widened when the mass transfer timescale and the period of transient boundary is comparable due to the nonequilibrium mass transfer effects; and (2) a thick mixing zone occurs in low-permeability layer when it overlays upon a fast flow layer. These results not only improve the understanding of the dynamics of mixing-zone development and its associated geochemical processes in coastal aquifers, but also identify hydrogeologic conditions for the model of sharp-interface approximation to be valid.
In addition to better understanding the mechanisms and dynamics of mixing zone, this thesis also investigates cost-effective management of coastal groundwater resources. To protect and conserve limited water recourses in coastal regions, interest in aquifer storage and recovery (ASR) has been growing in recent years. ASR is a promising strategy for water resources management and has been widely used in many contaminated and saline aquifers. However, its performance may be significantly constrained by mass transfer effects due to the mobilization of solutes initially residing in immobile domains. Better understanding of kinetic mass transfer effects on ASR is needed in order to aid the decision-making process. A numerical model is developed to simulate ASR performance by combining the convergent and divergent dispersion models with a first-order mass transfer model. By analyzing the concentration history at the pumping well, we obtain simple and effective relationships for investigating ASR efficiency under various mass transfer parameters, including capacity ratio and mass transfer timescales, and operational parameters. Based on such relationships, one can conveniently determine whether a site with mass transfer limitations is appropriate or not for ASR and how many ASR cycles are required for achieving a positive recovery efficiency (RE).
17
Lydon, Andrew. "Compilation For Intrusion Detection Systems." Ohio University / OhioLINK, 2004. http://www.ohiolink.edu/etd/view.cgi?ohiou1088179093.
Full text
18
Centeno, Adrio Peixoto. "Os granitóides sintectônicos pós-colisionais Sanga do Areal, intrusivos no Complexo Arroio dos Ratos, na Região de Quitéria, RS." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/70407.
Full textAbstract:
Esta dissertação faz parte de um projeto que tem como objetivo investigar a origem e evolução do magmatismo de arco e pós-colisional do Escudo Sul-rio-grandense (ESRG), caracterizando a partir de estudos geoquímicos, estruturais e petrográficos os Granitóides Sanga do Areal (GSA), localizados na região de Quitéria, porção leste do Escudo Sul-rio-grandense. Estes granitóides consistem de dois corpos principais, alongados na direção NE-SW, com aproximadamente 14 km de extensão e 2 km de largura, e também de diversas intrusões menores, posicionadas, preferencialmente, na porção mediana de alta deformação cisalhante do Complexo Arroio dos Ratos. Estão em contato na porção NW com metatonalitos, metagranodioritos e gnaisses tonalíticos a dioríticos de idade paleoproterozóica do referido complexo e com horblenda-biotita granodioritos da unidade neoproterozóica Granodiorito Cruzeiro do Sul. Na porção SE o contato se dá com tonalitos a dioritos relacionados aos Granitóides Arroio Divisa de idade neoproterozóica. Os GSA são biotita monzogranitos de textura porfirítica em seu termo principal, com cerca de 30% de megacristais de até 5 cm de comprimento de plagioclásio e K-feldspato. A matriz heterogranular média a grossa é composta por quartzo fitado, feldspato parcialmente recristalizado e biotita. Subordinadamente, observam-se corpos de espessura centimétrica a métrica de biotita granodiorito equigranular médio, com fenocristais esparsos de feldspatos alinhados na foliação. Raramente ocorrem enclaves microgranulares máficos. A foliação milonítica é bem marcada pela orientação da biotita, dos megacristais lenticulares e do quartzo fitado e tem direção E-W, com alto ângulo de mergulho para N e para S, contendo lineação de estiramento direcional, com baixo caimento para W a SW. A foliação ígnea primária, concordante a sub-concordante com a foliação milonítica, tem ocorrência restrita e é marcada pela orientação dos megacristais não deformados e das lamelas de biotita. Estruturas S-C, caudas assimétricas em porfiroclastos de feldspatos, biotita fish e fitas assimétricas de quartzo são consistentes e indicam movimento transcorrente sinistral. Os Granitóides Sanga do Areal têm afinidade sub-alcalina médio a alto K, provavelmente toleítica, compatível com ambiente pós-colisional, onde foram deformados e controlados por zonas de cisalhamento transcorrente sub-verticais. Foi obtida uma idade U-Pb em zircão dos granitóides de 626,6±4,9 Ma (MSWD=2.2), coerente com as relações de campo.This research investigates the evolution of arc to post-collisional magmatism in the Sul-rio-grandense Shield (ESGR), using geochemistry, structural and petrographic studies of the Sanga do Areal Granitoids (GSA). These granitoids are located in the Quitéria region, east of ESRG. The GSA form two main, NE-striking intrusions, and several other small ones, mainly within the shear zone croscutting the central portion of the Arroio dos Ratos Complex. The two main bodies are about 14 km long and 2 km wide. To the northwest, the GSA rocks are in contact with Paleoproterozoic metatonalites, metagranodiorites, tonalitic to dioritic gneisses of the Complex, and Neoproterozoic horblende-biotite granodiorites of the Cruzeiro do Sul unit. To the southeast, they are surrounded by tonalitic to dioritic rocks, related to the Neoproterozoic Arroio da Divisa Granitoids. The GSA rocks are composed mainly of porphyritic biotite monzogranites, with about 30% megacrysts of plagioclase and 5 cm long K-feldspar. The medium to coarse grained heterogranular groundmass is composed of microcrystalline ribbon quartz, partially re-crystallized feldspar and biotite. Medium-grained equigranular granodiorite occurs as centimeter to meter- thick bodies, with sparse feldspar megacrysts aligned on the foliation plane. Microgranular mafic enclaves are rarely observed within the GSA rocks. The mylonitic foliation is well-developed and marked by biotite, oriented lenticular megacrysts, as well as quartz ribbons. It strikes E-W and dips at high angles either N or S. The stretching lineation within the foliation shows shallow plunges, preferentially W-SW. A primary igneous foliation is sometimes observed, and it is concordant or sub-concordant with the mylonitic one, and marked by orientation of igneous megacrysts and biotite lamellae. S-C structures, asymetric tails in feldspar porphyroclasts, biotite fish, and asymetric quartz ribbons indicate transcurrent movement with consistent sinistral shear sense. The Sanga do Areal Granitoids show subalkaline medium- to high-K affinity, probably tholeiitic, and trace element composition consistent with sources related to post-collisional settings, which were deformed and controlled by E-NE and NE sub-vertical transcurrent shear zones. A U-Pb age in zircon grains from Sanga do Areal Granitoids of 626.6 ± 4.6Ma ((MSWD=2.2) was obtained and considered coherent with stratigraphic relations.
19
Butak, Kevin Clifford. "Multi-Scale Magnetic Stratification of an Ultramafic-Mafic Complex: Example of the Great Dyke of Zimbabwe and Implications for Magmatic Differentiation." OpenSIUC, 2011. https://opensiuc.lib.siu.edu/theses/726.
Full textAbstract:
Layered mafic intrusions represent an important aspect of magmatism on earth and have occurred from Archean to present times. Literature on the geochemistry and petrology of these intrusions abounds but their physical properties, which could provide significant constraints on their formation, have seldom been investigated. Classic petrological methods such as whole-rock geochemistry, textural analysis and mineral chemistry have been applied to several intrusions of various ages. Most of these methods are relatively expensive or time intensive which limits high resolution studies. On the contrary, magnetic methods are typically inexpensive and fast and have been successfully applied to various occurrences of mafic rocks. In this study, several magnetic methods have been applied to a 600 m-long continuous borehole core drilled through one of the world's largest layered mafic intrusion, the Great Dyke of Zimbabwe. The main goal of this study is to constrain the magmatic history of the intrusion. More specifically, it is important to determine if the intrusion functioned as an open system, characterized by multiple magma pulses, or as a closed system, undergoing differentiation after a single magmatic pulse. The magnetic methods have also been validated by other independent approaches including image analysis, and electron microprobe. This study demonstrates that magnetic methods can be used to rapidly obtain critical information on the internal structure of this type of intrusion before applying more costly chemical analyses. The main scientific result of this study is to document the closed system nature of the Great Dyke of Zimbabwe, at least throughout the sequence investigated.
20
Zhang, Tao. "RADAR: compiler and architecture supported intrusion prevention, detection, analysis and recovery." Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-08042006-122745/.
Full textAbstract:
Thesis (Ph. D.)--Computing, Georgia Institute of Technology, 2007.Ahamad, Mustaque, Committee Member ; Pande, Santosh, Committee Chair ; Lee, Wenke, Committee Member ; Schwan, Karsten, Committee Member ; Yang, Jun, Committee Member.
21
Yao, Sai-Nan. "Troubles cognitifs dans les obsessions-compulsions - etude controlee des itnerpretations des pensees intrusives dans trois dimensions : responsabilite, culpabilite et inferiorite." Lyon 2, 1999. http://theses.univ-lyon2.fr/documents/lyon2/1999/syao.
Full textAbstract:
Le modele cognitif des troubles obsessionnels-compulsifs (toc) suggere que les interpretations irrationnelles vis-a-vis des pensees intrusives pourraient etre des structures cognitives sous-jacentes aux obsessions compulsions. Les etudes recentes sur les interpretations des pensees intrusives se sont focalisees sur trois domaines: la responsabilite, la culpabilite et l'inferiorite. Notre travail a pour but d'etudier les pensees intrusives et leurs interpretations dans ces trois dimensions chez 48 patients presentant des toc, compares a 36 patients phobiques sociaux et a 48 sujets non-cliniques. Le questionnaire des pensees intrusives et de leurs interpretations -version revisee (qpii-r) et l'echelle d'inferiorite sont utilises. Nos resultats mettent en evidence que les pensees intrusives et leurs interpretations, ainsi que les trois dimensions d'interpretations irrationnelles: responsabilite, culpabilite et inferiorite sont toutes significativement plus elevees chez les patients presentant les toc que chez les patients phobiques sociaux et chez les sujets non-cliniques. Les regressions multiples montrent qu'elles sont toutes particulierement liees a la pathologie obsessionnelle compulsive. Plus les pensees intrusives sont frequentes, plus les interpretations irrationnelles sont elevees. Certains types de pensees intrusives ont un lien particulier avec certaines dimensions d'interpretations sur les pensees intrusives: les pensees intrusives a theme d'agressivite ont un lien particulier avec l'interpretation de responsabilite; les pensees intrusives a theme de perfectionnisme et a theme de perte sont surtout liees a l'interpretation d'inferiorite; et les pensees intrusives a theme de sexualite seraient liees aux interpretations de culpabilite et d'inferiorite. Le sentiment d'inferiorite est plus eleve chez les patients obsessionnels et phobiques sociaux que chez les sujets non-cliniques et plus eleve chez les patients avec des troubles de personnalite associes que chez les patients sans troubles de personnalite. Il serait un trait commun a la phobie sociale et aux troubles obsessionnels compulsifs. Mais les sujets obsessionnels se differencient des sujets phobiques sociaux par un sentiment d'inferiorite plus specifique vis-a-vis de leurs pensees intrusives. Nos resultats confirment le modele cognitif du toc, qui presume et souligne l'existence et l'importance
22
Loureiro, Gustavo Lopes. "Complexo Anelar Caramuru paleozóico do tipo- A no domínio Seridó, Província Borborema, NE- Brasil." reponame:Repositório Institucional da UnB, 2012. http://repositorio.unb.br/handle/10482/18572.
Full textAbstract:
Dissertação (mestrado)—Universidade de Brasília, Instituto de Geociências, Programa de Pós-Graduação, 2012.Submitted by Raquel Viana (raquelviana@bce.unb.br) on 2015-10-07T13:09:52Z No. of bitstreams: 1 2012_GustavoLopesLoureiro.pdf: 13984114 bytes, checksum: 5cd6b20189d20cc90cedc9e4db3b0db0 (MD5)
Approved for entry into archive by Raquel Viana(raquelviana@bce.unb.br) on 2015-10-07T13:53:05Z (GMT) No. of bitstreams: 1 2012_GustavoLopesLoureiro.pdf: 13984114 bytes, checksum: 5cd6b20189d20cc90cedc9e4db3b0db0 (MD5)
Made available in DSpace on 2015-10-07T13:53:05Z (GMT). No. of bitstreams: 1 2012_GustavoLopesLoureiro.pdf: 13984114 bytes, checksum: 5cd6b20189d20cc90cedc9e4db3b0db0 (MD5)
A Província Borborema é uma unidade geotectônica Brasiliana-PanAfricano formada como resultado da convergência dos cratons Amazônico, São Luis, Africa Oeste e São Francisco-Congo. Ele consiste de partes de núcleos arqueanos e um embasamento gnáissico-migmatítico Paleoproterozóico, sobrepostos por sequências supracrustais meso-neoproterozóicas. A Província Borborema é caracterizada por um extenso e diversificado plutonismo neoproterozoico-cambriano. A área de estudo está localizada no Rio Grande do Norte, onde foram reconhecidos dois complexos intrusivos de tipo anelares não deformados. Os dois complexos são constituídos por um monzo-sienogranito rosa na parte interna e por um monzogranito cinza na parte externa. Ambos os granitos são subalcalinos e ligeiramente peraluminous com alto teor de K2O. Os monzogranitos cinza é caracterizado por forte fracionamento das Terras Raras pesadas (HREE) e valores εNd variando de -22,4 para -22,9. O sienogranito rosa é caracterizado por um fraco fracionamento das HREE e εNd variando de -16,1 para -21,4. Uma fácies sienítica com caráter shoshonítico e metaluminoso tem sido reconhecida em um dos complexos. Abundante inclusões microgranulares máficas hospedadas nos granitos rosa e cinza, e nos sienitos tem caráter shoshonítico e metaluminoso com fraco fracionamento das HREE e εNd variando de -11,4 para -14,2. Duas datações U-Pb em zircão foram realizadas em diferentes facies dos dois complexos: monzogranito cinza e sienito. Medidas de isótopos de Hf foram realizadas em zircão da amostra sienítica. As análises foram realizadas usando LA-MC-ICP-MS Neptune no Laboratório de Geocronologia do Instituto de Geociências da Universidade de Brasília, e forneceram duas idades de 481 ± 6 Ma 492 ± 9 Ma. Os valores de εHf de zircões magmaticos analisados variam de -0,11 a -8,71. Nossos dados sugerem que essas intrusões representam três diferentes tipos de magma: um magma básico para intermediário com afinidade shoshonítica e derivação do manto litosférico, e dois magmas graníticos diferentes com assinatura de crosta inferior e crosta superior, respectivamente. ______________________________________________________________________________________________ ABSTRACT
The Borborema Province is a Brasilian-Pan-African geotectonic unit formed as a result of the convergence of the Amazonian, West African–São Luis, and São Francisco–Congo cratons. It consists of portions of Archeans cores and gneissicmigmatitic Paleoproterozoic basement, superimposed by Mezoproterozoic to Neoproterozoic supracrustal sequences. The Borborema Province is characterized by an extensive and diversified Nneoproterozoic to Cambrian plutonism. The study area is located in Rio Grande do Norte state where two undeformed ring-complex type intrusives were recognized. Both complexes are constituted by a pink monzo-syenogranite in the inner part and by a grey monzogranite in outer rims. Both granites are subalkaline and slight peraluminous with high K2O content. The grey monzogranites is characterized by strong HREE fractionation and εNd values varying from -22.4 to -22.9. Pink syenogranite is characterized by slight HREE fractionation and εNd varying from -16.1 to -21.4. A syenitic facies with shoshonitic and metaluminous character have been recognized in one of the complexes. Abundant mafic microgranular inclusions hosted in the pink and gray granites, and in the syenites have shoshonitic and metaluminous character, slight HREE fractionation and εNd varying from -11.4 to -14.2. Two U-Pb datings on zircons were carried out on different facies from the two complexes: the grey monzogranite and syenite. Hf isotope measurements were carried out on zircons from the syenitic sample. Analyses were carried out using LA-MC-ICPMS Neptune at the Laboratory of Geochronology of the Geosciences Institute at the University of Brasilia, and gave two ages of 481±6 Ma 492±9 Ma. The εHf values of analyzed magmatic zircons vary from -0.11 to -8.71. Our data suggest that these intrusives represent three different types of magma: a basic to intermediate magma with shoshonitic affinity and lithospheric mantle derivation, and two different granitic magmas with lower crust and the upper crust signature respectively.
23
Wnukowski, Joseph Daniel. "Magnetic investigations in the J-M reef section of the Stillwater Complex, Montana." OpenSIUC, 2015. https://opensiuc.lib.siu.edu/theses/1641.
Full textAbstract:
The Stillwater Complex J-M reef, the only economic platinum deposit in the United States, consists of a 0.5 to 4 m-thick stratiform horizon of PGE-rich sulfides in an Archean layered mafic intrusion. The origin of this reef has been studied extensively using geochemical methods, yet remains highly debated. Dynamic magmatic processes have been virtually ignored in these geochemical studies. Magnetic methods provide a proven inexpensive approach to offer rapid, and reproducible results to deliver insight into these dynamic processes. I propose to investigate the variations of magnetic properties of layered rocks of the Stillwater Complex in the stratigraphic vicinity of the J-M reef. In this study, detailed magnetic methods were performed on a 115 ft core containing the J-M reef and adjacent rocks. A previously undiscovered cyclicity of magnetic susceptibility was found in the hanging wall and J-M reef section. Further tests were performed to determine the origin of the magnetic cycles. The footwall section lacked the magnetic properties seen in the J-M reef and hanging wall rocks. Both anisotropy of magnetic susceptibility, and high field magnetic data was collected at a high resolution interval along the core. It is possible that the results of this study can be used to constrain the origin of the ore body.
24
Langin, Chester Louis. "A SOM+ Diagnostic System for Network Intrusion Detection." OpenSIUC, 2011. https://opensiuc.lib.siu.edu/dissertations/389.
Full textAbstract:
This research created a new theoretical Soft Computing (SC) hybridized network intrusion detection diagnostic system including complex hybridization of a 3D full color Self-Organizing Map (SOM), Artificial Immune System Danger Theory (AISDT), and a Fuzzy Inference System (FIS). This SOM+ diagnostic archetype includes newly defined intrusion types to facilitate diagnostic analysis, a descriptive computational model, and an Invisible Mobile Network Bridge (IMNB) to collect data, while maintaining compatibility with traditional packet analysis. This system is modular, multitaskable, scalable, intuitive, adaptable to quickly changing scenarios, and uses relatively few resources.
25
Masmejean, Bruno. "Le Complexe granito-anatectique sombre du Vivarais et les granites intrusifs associés pétrologie et signification géodynamique /." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37607747n.
Full text
26
Masmejean, Bruno. "Le complexe granito-anatectique sombre du Vivarais et les granites intrusifs associés : pétrologie et signification géodynamique." Lyon 1, 1987. http://www.theses.fr/1987LYO10131.
Full textAbstract:
L'etablissement d'une carte a 1/25 000 de la region de st felicien et d'une synthese a 1/100 000 du vivarais permet de cerner les importances respectives et les relations des diverses formations sombres affleurant dans la partie orientale du vivarais. L'etude petrographique et geochimique de chacune d'entre elles conduit a la determination de leur origine et de leur histoire
27
Silveira, Carlos José Sobrinho da. "Geocronologia U-Pb em zircão de rochas intrusivas e de embasamento na região do Vale do Jacurici, Cráton São Francisco, Bahia." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/132001.
Full textAbstract:
O Complexo Jacurici, localizado no NE do Craton São Francisco, hospeda o maior depósito de cromita do Brasil. O Complexo é constituído de várias corpos N-S, possivelmente fragmentos de um único grande sill rompido durante deformação. A idade das rochas hospedeiras é assunto de debate. Alguns trabalhos sugerem que está intruso no Bloco Arqueano Serrinha enquanto outros acreditam que é parte do Cinturão Salvador-Curaçá. Mapeamento está em desenvolvimento pela CPRM e FERBASA. Entretanto, poucos dados geocronológicos estão disponíveis para a área específica onde as rochas máfica-ultramáficas afloram. O terreno é dividido em dois segmentos chamados informalmente de paragnaisses e ortognaisses, o último supostamente mais jovem considerando estar menos deformado. Os ortognaisses ocorrem na parte norte do cinturão. Petrografia revelou que alguns dos paragnaisses são álcali-feldspato granitos fortemente milonitizados. Estes afloram relacionadas às bordas da intrusão máfica-ultramáfica na área de Ipueira. Ainda, os ortognaisses consistem, ao menos em parte, de monzogranitos com deformação de baixa temperatura. Datações de zircão por LAM-MC-ICP-MS foram realizadas para cinco amostras consideradas representativas. Apenas três resultaram em boas idades Concordia: uma rocha máfica, um monzogranito e um álcali-feldspato granito. Uma rocha máfica supostamente do embasamento produziu uma idade de 2102±5Ma e é petrograficamente similar aos metanorites descritos no Complexo Jacurici. A rocha é interpretada como registro dos primeiros pulsos do magmatismo máfico. O monzogranito gerou uma idade de 2995±15Ma, sendo mais antigo do que o esperado, relacionado ao Bloco Serrinha. O álcali-feldspato granito produziu uma idade de 2081±3Ma. O Sienito Itiúba e os pegmatitos que cortam o Complexo Jacurici tem idades semelhantes. Isto mostra uma relação muito estreita entre todas estas rochas. Considerando a falta de informações sobre a seqüência supracrustal que hospeda as rochas alcalinas e máfica-ultramáficas intrusivas nas áreas de Ipueira e Medrado, é possível que parte do terreno pertença ao Cinturão Salvador-Curaçá. Sugerimos que o Complexo Jacurici possa ter sido intrudido após a colagem tectônica entre o Bloco Serrinha e a parte mais antiga do Cinturão Salvador-Curaçá e, portanto, poderia ser hospedado por ambos.The Jacurici Complex, located in the NE of the São Francisco Craton, hosts the largest chromite deposit of Brazil. The Complex is constituted by several N-S bodies, possible fragments of a single larger sill disrupted during deformation. The age of the host rocks is still debatable. Some works suggest it is intruded on the Serrinha Archean Block while others believe it is part of the Salvador-Curaçá Belt. Mapping is under development by CPRM and FERBASA. Nevertheless, few geochronological data is available for the specific area where the mafic-ultramafic rocks outcrop. The terrain is broadly divided in two segments called informally as paragneisses and orthogneisses, the last is supposed to be younger considering it is less deformed. The othogneisses occur at the northern part of the belt. Petrography revealed that some of the believed paragneisses are actually an alkali feldspar granite strongly milonitized. It outcrops closely related to the borders of the mafic-ultramafic intrusion in the Ipueira area. Also, the orthogneisses consist, at least in part, of monzogranites with low temperature deformation. Zircon LAM-MC-ICP-MS dating were performed for five samples considered representative. Just three provided good Concordia ages: one mafic rock, one monzogranite and one alkali feldspar granite. A supposed basement mafic rock produced a 2102±5Ma age and is petrographyly similar to the metanorites described in the Jacurici Complex. The rock is interpreted as the record of the first pulses of mafic magmatism. A monzogranite yields a 2995±15Ma age, older than expected, related to the Serrinha Block. The alkali feldspar granite yields a 2081±3Ma age. The Itiúba Syenite, the Jacurici Complex and pegmatites that crosscut the Complex have similar ages. It shows a very close relationship between all these rocks. Considering the lack of information about the supracrustal sequence that hosts the intrusive alkaline and mafic-ultramafic rocks at the Ipueira and the Medrado areas, it is possible that part of the terrain belongs to the Salvador-Curaçá Belt. We suggest that the Jacurici Complex can be intruded after the tectonic amalgamation of the Serrinha Block and the older part of the Salvador-Curaçá Belt and, therefore, could be hosted by both terrains.
28
Mock, Alexander. "Quantitative petrographic investigations of porphyritic rhyolitic laccoliths of the Halle Volcanic Complex, Germany." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2009. http://nbn-resolving.de/urn:nbn:de:swb:105-26297.
Full textAbstract:
Felsic phenocrysts of the laccoliths have straight size distributions (characteristic lengths 3.4 to 36 mm) and R-values from 1.34 to 0.78 (randomly distributed, no touching frameworks). Laccoliths have crystallinities from 10 to 30%. Textural coarsening possibly played a role in crystallization history. Serial sectioning reveals true shapes, sizes and three dimensional size distributions, non-touching frameworks, aspect ratios from 1.7:1.5:1 to 8.7:1.9:1 and a minimum sampling size of ~200 crystals. Different textural varieties develop late in system evolution and differed in density (~1%), viscosity and, thus, level of emplacement. Phenocryst populations formed on a timescale between 10 days and 2000 years, growth during emplacement is negligible. Models for filling and cooling of laccoliths suggest timescales from few 100 to ~20000 years. Contacts of laccoliths appear brecciated and sometimes show intercalation of magma and host sediment under ductile deformation. Dimensions of laccoliths plot in the field for such intrusions on a logarithmic width vs. thickness plot. Laccoliths intruded as distinct magma batches. More laccoliths than recognised before can be distinguished. Comparing felsic laccolith complexes in Late Palaeozoic transtensional basins, gives rise to new types of laccolith complexes termed Donnersberg and Halle type.
29
Polivchuk, Matthew. "The Formation of Vanadium Deposits in the Archean Rivière Bell Complex, Quebec: Insights from Fe-Ti Oxide Chemistry." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37071.
Full textAbstract:
Cryptic trends in the trace element chemistry of Fe-Ti oxide minerals have been used to elucidate the magmatic processes responsible for the formation of Fe-Ti-V deposits in the Rivière Bell Complex layered mafic-ultramafic intrusion near Matagami, Quebec, Canada. Although metamorphism at greenschist-amphibolite facies conditions has modified the primary igneous compositions of magnetite and ilmenite, their Cr and V contents appear to have been unaffected. Chemostratigraphic variations of these elements in Fe-Ti oxides therefore remain valid tracers of magmatic differentiation, even in metamorphosed settings. Injections of compositionally evolved, Fe-Ti oxide-laden magma into a more primitive ferrogabbroic host are presumably responsible for sharp decreases in the Cr and V concentrations of Fe-Ti oxides that coincide with lithostratigraphic changes from predominantly disseminated gabbros to ultramafic sequences closely interlayered with massive oxides. These injections highlight the multistage magmatic history of the layered series of the Rivière Bell Complex and its vanadium ore horizons.
30
Mock, Alexander. "Quantitative petrographic investigations of porphyritic rhyolitic laccoliths of the Halle Volcanic Complex, Germany." Doctoral thesis, [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=972002898.
Full text
31
Rajagopalan, Mohan. "Optimizing System Performance and Dependability Using Compiler Techniques." Diss., Tucson, Arizona : University of Arizona, 2006. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu%5Fetd%5F1439%5F1%5Fm.pdf&type=application/pdf.
Full text
32
Serrano-Cases, Alejandro. "Fault tolerance in critical aerospace embedded systems: Multi-threaded mitigation, non-intrusive compiler-guided hardening, and early prediction of proton and neutron induced soft errors." Doctoral thesis, Universidad de Alicante, 2020. http://hdl.handle.net/10045/114836.
Full textAbstract:
Hoy día, existe una creciente demanda de las capacidades computacionales en sistemas críticos, donde los estados inesperados o inoperantes no son aceptables. Algunos de estos sistemas funcionan en entornos hostiles, sufriendo un comportamiento anómalo (faults), tanto en el software como en el hardware. Con objeto de solucionar esta problemática, se está recurriendo a la utilización de soluciones de computación, que explotan las nuevas características presentes en los microprocesadores de última generación. Entre estas características, destaca un mayor número de núcleos, mejor rendimiento computacional y menor consumo energético. Esta evolución de los microprocesadores es debida, entre otros factores, a la mejora en el proceso de fabricación fotolitográfico, sin embargo, este proceso está reduciendo progresivamente la tolerancia de los nuevos microprocesadores a los fallos inducidos por la radiación, conocidos como Efecto de Evento Único (Single Event Effect - SEE). Destacando, entre las fuentes que generan un comportamiento anómalo, las fuentes naturales de radiación, como los rayos cósmicos, o las fuentes de radiación artificial, como las producidas por máquinas de radio-diagnóstico. En esta tesis, se propone varias estrategias para mejorar la fiabilidad de los sistemas críticos que operan en presencia de radiación ionizante, tanto en el espacio, como a nivel terrestre. En este contexto, la radiación ionizante puede alterar la salida de un sistema digital creando interferencias, fallos y alteraciones permanentes en los circuitos, entre otras muchas incidencias. Como resultado, los sistemas críticos pueden comportarse de manera inesperada, produciendo resultados erróneos o entrando en estados no operativos, que requieran un mecanismo externo para recuperar un funcionamiento correcto (watchdogs, interrupciones temporizadas). En la bibliografía, se encuentra que las técnicas basadas en redundancia, aplicables tanto a hardware como a software, son las soluciones más efectivas para detectar y mitigar este tipo de comportamiento inesperado. Estas técnicas basadas en redundancia, presentan una alta variabilidad, dado que puede aplicarse a estructuras de diferente complejidad. En el caso de redundancia software, se puede utilizar a nivel de instrucciones de ensamblador, accesos de memoria, funciones o métodos, incluso a nivel de procesos o hilos. Es importante destacar que, la variabilidad de las diferentes técnicas de mitigación de fallos, provoca una alta complejidad de la predicción del efecto de estas técnicas en el conjunto del sistema. De manera paradójica, la aplicación de estas técnicas de endurecimiento a algunos elementos de un sistema, en ocasiones, puede dar lugar a un aumento de la susceptibilidad del sistema a fallos inducidos por radiación, por consiguiente, a una reducción significativa de la fiabilidad. Esta paradoja, es debida, al aumento de los sobrecostes en los recursos utilizados, o al incremento computacional de dicha técnica de endurecimiento. De manera general, con objeto de reducir la susceptibilidad a fallos inducidos por la radiación, en diferentes sistemas críticos, en esta tesis, se pretende mejorar la fiabilidad, adaptando o proporcionando nuevas técnicas y herramientas para el endurecimiento software en microprocesadores de última generación. Para ello, se han desarrollo dos técnicas, la primera se centra en la búsqueda automática de soluciones maximizando la fiabilidad; la segunda técnica desarrollada, consiste en un endurecimiento software basado en redundancia, optimizado para obtener un mayor rendimiento computacional. Además, se ha desarrollado un nuevo modelo matemático semi-empírico, para evaluar y predecir los fallos inducidos por radiación. La primera de las técnicas desarrolladas, explora, de manera eficiente, soluciones que maximicen la fiabilidad, buscando optimizaciones y endurecimientos que aumenten el rendimiento del sistema, reduzcan los recursos utilizados y, al mismo tiempo, aumenten la cobertura frente a fallos. Con objeto de optimizar el rendimiento y el uso de recursos de las aplicaciones y circuitos, en esta tesis, se utilizan técnicas de aprendizaje automático y algoritmos de búsqueda meta-heurísticos, inspirados en los sistemas naturales (algoritmos genéticos), optimizados con técnicas de optimización multiobjetivo basadas en el concepto de eficiencia de Pareto. Este algoritmo de búsqueda optimizado, permite mejorar al mismo tiempo el rendimiento del sistema, el uso de los recursos y la cobertura de fallos, ya que es capaz de explorar un espacio de soluciones multidimensional de manera eficiente. La aplicación de este algoritmo, permite alterar la generación de las aplicaciones, por parte del compilador, logrando obtener aplicaciones más fiables de forma no intrusiva, es decir, sin necesidad de modificar el código. La segunda de las técnicas desarrolladas, propone una mejora de las técnicas de endurecimiento clásicas, empleando esquemas paralelos basados en el multiprocesamiento simétrico y asimétrico (SMP y AMP, respectivamente). Con objeto de lograr un incremento en la fiabilidad, se han utilizado sistemas mononúcleo y multinúcleo, a los que se les ha eliminado la necesidad de un sistema operativo, con el fin de reducir los sobrecostes de recursos y aumentar el rendimiento, manteniendo la cobertura frente a fallos. Por último, se ha desarrollado un modelo semi-empírico que permite la evaluación y selección de las configuraciones más fiables. Además, el modelo también permite realizar un endurecimiento selectivo de los recursos críticos, antes de acometer una campaña de radiación acelerada. En el desarrollo del modelo, se emplea tanto datos históricos de campañas de radiación real, como los resultados de las campañas de inyección simulada de las aplicaciones. Así, el modelo es capaz de realizar una predicción temprana de la fiabilidad de las nuevas soluciones, antes de probarlas bajo radiación real en aceleradores de partículas. Para verificar el modelo, se realizaron pruebas de radiación acelerada de varias soluciones, desarrolladas en esta tesis, empleando protones en el Centro Nacional de Aceleradores (CNA) de Sevilla, y empleando neutrones en Los Álamos National Laboratory (LANL - USA).
33
Prout, Sarah Jane. "Petrology, geochemistry and mineralisation of the Ben Buie intrusion, Isle of Mull, and a brief survey of mineralisation in the Peridotite series, Cuillin Complex, Skye." Thesis, University of Exeter, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.403209.
Full text
34
Pires, Carlos Alberto da Fonseca. "Modelamento e avaliação de dados geofísicos e geoquímicos aplicada na pesquisa de metais básicos e Au no prospecto Volta Grande (complexo intrusivo Lavras do Sul, RS, Brasil)." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2002. http://hdl.handle.net/10183/3001.
Full textAbstract:
A modelagem, a correlação e a análise de dados geofísicos e geoquímicos, aplicados para avaliar/definir a distribuição e o controle de teores de minério num espaço 3D, não são procedimentos adotados para o caso de depósitos de metais básicos e Au. Essa tese de doutorado tem o objetivo de avaliar e definir uma metodologia de modelagem, correlação e análise de dados geofísicos e geoquímicos para controle de teores de metais básicos e Au. Tal metodologia foi aplicada no Prospecto Volta Grande (Lavras do Sul, RS). A região de Lavras do Sul (RS) possui uma série de ocorrências minerais do tipo veios de quartzo com metais básicos e Au, as quais estão relacionadas com o processo de alojamento do Complexo Intrusivo Lavras do Sul. Esse complexo é uma intrusão predominantemente granítica, zonada e multifásica, cujas rochas têm filiação com as séries shoshonítica a alcalina. As ocorrências de veios estão relacionadas a zonas de alteração hidrotermal controladas por fraturas predominantemente WNW-ESE. O Prospecto Volta Grande é constituído por uma série de tais veios alojados tanto no granito intrusivo, quanto nas rochas vulcânicas e vulcanoclásticas da Formação Hilário. A metodologia desenvolvida consiste: 1) da construção de uma base de dados comum para o georreferenciamento 3D dos dados; 2) processamento estatístico e geoestatístico das variáveis de interesse (dados geofísicos e geoquímicos); 3) modelagem 3D das variáveis de interesse para definir a distribuição espacial; e 4) análise da correlação entre as variáveis para definir o controle 3D dos teores de minério por meio de métodos indiretos. Essa metodologia, na medida em que haja a possibilidade de várias fontes de informação e a possibilidade de aplicar algorítmos de lógica matemática, poderá incorporar a integração de dados num espaço 3D A aplicação de tal metodologia no Prospecto Volta Grande (Lavras do Sul, RS) permitiu verificar que os dados geofísicos e geoquímicos se adaptam mais adequadamente a uma distribuição do tipo lognormal. Além disso, a comparação múltipla das médias de resistividade aparente permitiu distinguir um controle litológico sobre os dados geofísicos. Desse modo, foram definidos os procedimentos de análise variográfica e, então, os parâmetros para a modelagem 3D dos corpos condutores em cada área de pesquisa. A adequação do suporte amostral dos dados geofísicos e geoquímicos permitiu a correlação entre essas variáveis. A análise dos diagramas de correlação revelou superposição de pulsos de mineralização com distintas cargas metálicas. A utilização de métodos indiretos para controle de teores em depósitos sulfetados do tipo veios de quartzo com Au + Cu é, portanto, uma possibilidade concreta, garantida a adequada resolução espacial dos levantamentos geofísicos.
35
Zhao, Dan. "Study on the creep behavior of clay under complex triaxial loading in relation to the microstructure." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0372/document.
Full textAbstract:
Cette recherche vise à analyser et à identifier, par des essais, le comportement au fluage d'une argile de type kaolinite sous un état de contraintes triaxial. Une investigation fine de l’état microstructural, avant et après fluage, a par ailleurs été réalisée. Les résultats macroscopiques ont permis de constater que des phénomènes de dilatance et de contractante s’amplifient pendant le fluage. Les résultats montrent également que la position, sur le plan des contraintes (p'-q), du niveau de contrainte vis-à-vis des différents domaines volumétriques, contrôle le développement de la déformation au fluage et du taux de déformation. Les résultats de MEB ont montré que l'évolution microstructurale de l'argile, après le chargement mécanique, dépend fortement de l'histoire du chargementThe objective of this research is to analyze the creep behavior of a typical clay along triaxial tests, moreover, to analyze the microstructural mechanisms of creep. Analysis on the macroscopic results ascertained that both dilatancy and contractancy phenomena could occur during creep. The magnitude of the dilatancy/contractancy during creep was guided by the test conditions: stress level and the over consolidation ratio, which specifically governed the direction of the volumetric strain variations. The results of SEM indicated that the microstructural evolution of the clay after the mechanical loading depend on the stress history. Afterwards, the structural evolution in creep phase depends on the structural pattern developed in monotonic loading
36
Niegisch, Max, Andreas Kamradt, and Gregor Borg. "The upper zone of the Storkwitz Carbonatite: Geochemical and mineralogical characterization of the REE-mineralisation in the upper zone of the Storkwitz Carbonatite Complex from drill core SES-1/2012." Sächsisches Landesamt für Umwelt, Landwirtschaft und Geologie, 2020. https://slub.qucosa.de/id/qucosa%3A71506.
Full textAbstract:
Im Umfeld von Delitzsch befinden sich unter der etwa 100 m mächtigen Bedeckung aus tertiären Lockersedimenten mehrere magmatische Körper aus Karbonat. Im Jahr 2012 wurde durch die Deutsche Rohstoff AG bei Storkwitz eine 700 m tiefe Explorationsbohrung auf Seltene Erden Elemente abgeteuft. Im Rahmen eines Forschungsprojektes wurde der Frage nachgegangen, wie und woher die Seltenen Erden in das Gestein hineingelangten. Die Ergebnisse können Hinweise auf möglicherweise bisher unbekannte Anreicherungen von Seltenen Erden in anderen Nebengesteinen als den Karbonatiten geben.
Die Veröffentlichung liegt nur in englischer Sprache vor.The Storkwitz-Carbonatite is a Late Cretaceous intrusive complex, which is well-explored by a relatively large number of exploration bore holes both from the 1970ies, 1980ies and from one more recent bore hole, SES-1/2012. The carbonatite complex hosts a (currently) marginally economic mineralisation of rare earth elements (REE) and niobium, which is technically still difficult to recover. The upper part of the carbonatitic body is located some 100-120 m below the Pre-Cenozoic land surface, which in turn is overlain by approximately 100 m of glacial, fluvio-glacial, and fluviatile sediments. The aim of this study was to characterize the mineralisation in the upper part of the intrusion geochemically and mineralogically and to try to identify indications of a supergene overprint on the late magmatic to hydrothermal mineralisation. Fresh drill core samples from the exploration bore hole SES-1/2012 have revealed that the mineralisation is associated with a carbonatitic igneous breccia body and also with several alvikite veins. The breccia body is very heterogeneous, displays a variety of matrix colours and also a range of matrix-to-clast ratios.
37
Boulanger, Marine. "Le devenir des liquides au sein de la croûte océanique des dorsales à expansion lente : nouveaux apports de l'étude d'Atlantis Bank (dorsale Sud-Ouest Indienne)." Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0030.
Full textAbstract:
Les processus magmatiques qui régissent l'accrétion crustale au niveau des dorsales médio-océaniques à expansion lente restent à l'heure actuelle mal contraints. Parmi les processus potentiellement impliqués dans l'évolution des réservoirs de magma de la croûte inférieure, les réactions associées à des écoulements poreux réactifs au travers de bouillies cristallines - ou mush - tendent à supplanter les processus classiques de cristallisation simple des magmas. La part de ces processus dans la formation des gabbros cumulatifs de base de croûte est dépendante des modes de migration des liquides, qui sont eux-mêmes corrélés à la géométrie des réservoirs considérés. En combinant des études structurales, pétrographiques et géochimiques à haute résolution de sections in situ forées dans un corps complexe océanique de la dorsale Sud-Ouest indienne, j'ai pu apporter de nouvelles contraintes sur les modes de formation et d'évolution des réservoirs magmatiques impliqués lors de l'accrétion crustale. Le modèle de réservoir développé est généralisable, au moins en partie, à d'autres portions de croûte inférieure océanique. Ce modèle, ainsi que les nouvelles contraintes de l'étude expérimentale couplée des processus de cristallisation, ouvre la voie vers de nouvelles quantifications des processus d'interaction liquides-roches dans la différenciation des lithologies gabbroïques, et de manière plus générale dans l'évolution des liquides magmatiques de la croûte océanique. Ces développements vont de pair avec l'évolution au cours des dernières décennies de la vision des systèmes magmatiques crustaux, passant de chambres magmatiques constituées de liquides vers des modèles de réservoirs magmatiques majoritairement constitués de mush cristallinsMagmatic processes that govern crustal accretion at mid-ocean ridges still need to be better constrained. Among the processes potentially involved in the evolution of the lower crust magma reservoirs, reactions associated with reactive porous flow through crystal mushes tend to be considered as one of the predominant processes together with simple crystallization of magmas. The share of these processes during magma differentiation is dependent on the modes of melt migration and is thus correlated to the geometry of the reservoirs considered. By combining high-resolution structural, petrographic and geochemical studies of in situ sections drilled in an oceanic core complex of the Southwest Indian Ridge, I was able to bring new constraints on the formation and evolution of magmatic reservoirs involved in crustal accretion. All or part of the igneous reservoir model developed herein can be applied to other sections of lower oceanic crust. This model, together with additional constraints obtained by the coupled experimental petrology study of crystallization processes, paves the way for new quantifications of the involvement of melt-rock reactions in the differentiation of gabbroic lithologies, and more generally in the evolution of melts within the oceanic crust. Those developments are consistent with the constant evolution in recent decades of the understanding of crustal magmatic systems, which shifted from melt-filled magma chambers to igneous reservoir models mostly composed of crystal mushes
38
Costarella, René. "Le complexe annulaire alcalin de Combeynot ( Massifs cristallins externes, Alpes françaises), témoin d'un magmatisme en régime distensif. Pétrogéochimie et signification géodynamique." Phd thesis, Grenoble 1, 1987. http://tel.archives-ouvertes.fr/tel-00539879.
Full textAbstract:
Le massif de Combeynot, sur la bordure nord-orientale du massif du Haut-Dauphiné (massifs cristallins externes, Alpes Françaises) est constitué de deux unités fondamentales (1) un socle, déformé et métamorphisé, représenté par un ensemble migmatitique et un orthogneiss oeillé ; ce socle se rattache aux formations du noyau du massif du Haut-Dauphiné, (2) un complexe annulaire subvolcanique, intrusif dans le socle, composé de formations volcaniques et volcano-détritiques, d'un réseau filonien microgranitique et rhyolitique très dense, de deux unités granitiques disposées de manière concentrique et de filons doléritiques tardifs terminant l'épisode magmatique. Une étude comparative sur la pétrographie, la structure, la typologie des zircons et la géochimie des éléments majeurs, en traces (Y, Nb, Zr, Rb, Sr, U, Th, Hf, Sc, Cs et Ta) et Terres Rares du complexe de Combeynot ont permis de retracer l'histoire magmatique de la série et de tester sa signification géodynamique. Le magmatisme de Combeynot est de nature alcaline intraplaque et traduit un environnement géotectonique de distension. Il trouve son origine dans le manteau à partir duquel plusieurs magmas subcontemporains s'individualisent par des taux de fusion partielle différents et conduisent aux unités acides par cristallisation fractionnée. Leur mise en place superficielle dans une zone orogénique encore non consolidée, riche en fluides et la participation des phases fluides juvéniles et/ou des eaux météoriques conditionnent la nature pétrographique acide, sursaturée et subsolvus des unités granitiques du complexe ainsi que les processus d'altération hydrothermale post- et tardi- magmatiques.
39
Lemennicier, Yves. "Le complexe métamorphique du sud Karakorum dans le secteur du Chogo Lungma (Baltistan-Nord Pakistan) : étude structurale, métamorphique, géochimique et radiochronologique." Université Joseph Fourier (Grenoble), 1996. http://www.theses.fr/1996GRE10117.
Full textAbstract:
Les aspects tectonometamorphiques et plutoniques du complexe metamorphique du karakorum (kmc) on ete etudies dans le secteur du chogo lungma (n. Pakistan). Quatre ensembles d'orthogneiss, repris dans l'evolution tectonometamorphique, ont ete identifies, certains presentant des similitudes avec des granitoides deja connus plus au nord : l'ensemble bukpun est un equivalent des plutons de subduction cretaces de type hunza ou ghamu bar ; l'ensemble basha d'origine crustale probable presente quelques similitudes avec le granite oligo-miocene du baltoro ; l'ensemble bolocho a des caracteres intermediaires entre des complexes subalcalins et alcalins (d'ages cretaces a paleogenes). Les caracteristiques du quatrieme (aralter) sont originales dans le karakorum. L'histoire tectonometamorphique du kmc inclut : (i) des plis isoclinaux n100e a vergence sud associes a une schistosite s1 plan axial et formes dans un regime en aplatissement dominant. Ils correspondent au pic de metamorphisme (620 - 730c pour 7,5 - 11 kbar) ; (ii) des domes allonges n100e a n140e qui reprennent et deforment s1. Ils sont associes a une evolution metamorphique principalement en decompression (7,5 a 4 kbar). Ces domes seraient issus d'une deformation heterogene avec extrusion - a composantes verticale et decrochante - le long du mkt. Ils sont contemporains de la mise en place du pluton syenitique d'hemasil, magma potassique probablement issu d'une source mantellique enrichie et ayant certainement subi une contamination crustale. Les donnees #4#0ar/#3#9ar permettent d'estimer un age de mise en place a 9 ma. Il apparait donc qu'une partie de l'evolution tectonometamorphique et magmatique du kmc est tres recente et probablement en relation avec l'activation des grands decrochements regionaux. Elle est a rapprocher de celle du haut himalaya du nanga parbat situe au sud-ouest.
40
Van, Wagner Karen June. "Petrogenesis and Concentric Zonation of the Belchertown Intrusive Complex, West-Central Massachusetts." 2017. https://scholarworks.umass.edu/masters_theses_2/540.
Full textAbstract:
The Belchertown Intrusive Complex is a ~164 km2 Devonian pluton that intruded Paleozoic metasedimentary and metavolcanic rocks in west-central Massachusetts. Intrusion of the pluton was synchronous with Acadian deformation (Ashwal, 1974). The complex is concentrically zoned, with a core of orthopyroxene-biotite monzodiorite, a middle zone of clinopyroxene-hornblende-biotite granodiorite, and an outermost zone of hornblende-biotite granodiorite. Zoning from a more to less hydrous mineral suite from the outside to the inside of the pluton led Ashwal (1974) to suggest that metamorphic hydration most strongly affected the outermost zones of the complex. Basaltic inclusions occur most commonly near the edges of the pluton. Many of these inclusions preserve textures suggestive of mafic-felsic magma interaction. The abundance of basaltic enclaves on the edges of the complex may suggest a bowl-shaped structure, with lower more mafic-dominated rocks exposed on
the edges of the complex. Bulk rock major element analyses of granitoids, basalts and gabbros, and diorites from all zones of the complex show that intermediate samples, regardless of zone, plot on a mixing line between mafic and felsic end members, supporting a model in which mafic and felsic magmas may have mingled and mixed. Trace element analyses of intermediate-composition samples are similar across the entire complex, with enrichment in large ion lithophile elements and a pronounced Nb trough. In contrast, trace element concentrations in both the mafic rocks (basaltic enclaves and gabbroic inclusions), and in the granitoids, show considerable variation. The diversity of composition within both the mafic and felsic end-members suggests that either fractionation or differing degrees of partial melting of source rocks may account for these compositional ranges. Sanukitoids comprise a majority of the inner zone, and point to the mixing of parental melts at depth in a subduction tectonic regime as a likely model of petrogenesis for the complex.
41
Mandziuk, William Stanley. "Primary structures of the Falcon Lake Intrusive Complex, southeastern Manitoba." 2009. http://hdl.handle.net/1993/3645.
Full textAbstract:
The Falcon Lake Intrusive Complex is a composite intrusive body, approximately 10 square kilometers in area, located near the western edge of the Wabigoon Subprovince in the Superior Province of the Canadian Precambrian Shield. The complex has an elliptical shaped core, and tapering extensions to the southwest and northeast. The complex consists of a series of intrusions ranging from oldest gabbroic rocks in the extensions, through younger diorite-granodiorite in the outer areas of the core, to youngest quartz monzonite in the centre. All of the rocks of the complex are characterized by cumulate or porphyritic textures. The compositions, distribution, and relative ages of the component intrusions suggest a, separate differentiating magma chamber from which the intrusions were drawn sequentially. Successive intrusions of progressively more differentiated magma were intruded more or less into the centre of its less differentiated predecessor. The initial intrusion was dyke-like, and succeeding intrusions gave the complex a more equant and cylindrical shape. Relationships throughout the complex suggest that the complex was a magma conduit in which magmas were periodically transported from a source at depth to higher level intrusive or extrusive features. Each intrusion of the complex is characterized by its own set of primary fabric structures which may include the preferred orientation of primary minerals, layering, discordant intrusive contacts similar to angular unconformities, scour and trough-banded structures, mineral clots and segregations of various compositions, xenoliths and cognate inclusions, and breccia pipes. The form and arrangement of these primary structures. as well as relationships between structures, suggest that each intrusion initially consisted of a crystal-liquid mixture, and that magmatic flow processes were responsible for the development of the structures. The origin of the flow is related to intrusive emplacement mechanisms rather than convection processes after emplacement.
42
Tirschmann, Patricia A. "Geochemistry and fractional crystallization history of the Falcon Lake Intrusive Complex." 2009. http://hdl.handle.net/1993/3590.
Full textAbstract:
The Falcon Lake Intrusive Complex (FLIC) is a small (9 km2) compositionally zoned, composite intrusion located in the southwestern part of the Superior Structural Province. The complex was emplaced in Archean metavolcanic and metasedimentary rocks of the Lake of the Woods greenstone belt and represents a post-tectonic intrusion in its original intrusive orientation. The complex is comprised of six lithologic units: four outer gabbroic units (Gabbro #1-Gabbro #4), a central diorite-granodiorite unit and a quartz monzonite core. A K-AR (Wanless, 1963) date on biotite from the core rocks yielded a minimum age of 2.3 Ga. Geochemical data and field relationships indicate that the rock types comprising the FLIC represent a genetically-related magma suite derived from a LREE-enriched parental source with "alkaline-like" characteristics. The lithologies present, however do not represent a single continuous liquid line of descent. Gabbro #1 and Gabbro #2 are geochemically the most primitive rock types of the complex. Gabbro #3, Gabbro #4, as well as some of the more mafic dioritic rocks, are distinctly more evolved, but are geochemically indistinct from each other. The dioritic-granodioritic and quartz monzonitic rocks collectively display major and trace element trends consistent with a single liquid line of descent. The overall compositional zonation from oldest gabbroic rocks inward to youngest quartz monzonitic rocks can be explained by a combination of multiple intrusion and fractional crystallization processes. Formation of the mafic portions of the FLIC involved multiple intrusions of a) more primitive basic magma(s) and b) more evolved basic magmas. Evolution of the earlier, more primitive mafic units (Gabbro #1 and Gabbro #2) involved the fractionation of clinopyroxene and plagioclase while the later, more evolved, mafic units (Gabbro #3, Gabbro #4 and some of the diorites) were dominated by plagioclase crystallization and accumulation. Subsequent evolution of the intermediate to felsic portions of the complex appears to have taken place via inward fractional crystallization, the later stages of which involved upward movement and convective homogenization of mobile felsic differentiates followed by rapid cooling and crystallization forming the quartz monzonite core.
43
Fingler, Janice Lynn. "Precious metal mineralization related to the Falcon Lake Intrusive Complex, southeastern Manitoba." 2009. http://hdl.handle.net/1993/3628.
Full textAbstract:
The Falcon Lake Intrusive Complex (FLIC) is a composite pluton located in the Lake of the Woods greenstone belt of the Western Wabigoon Subprovince. Gold occurrences in the area are concentrated within the complex, itself, and in the country rock bordering the pluton to the north. Relationships between host rocks, structure, alteration, and mineralization suggest that the occurrences in the study area were formed during at least two mineralizing events. An early, pre-FLIC event localized low grade gold in zones of deformation in the country rocks. The intrusion of a diorite phase of the complex served to generate new structures, and remobilize and concentrate the gold precipitated during the early event. A later mineralization event giving rise to the interior occurrences is related to the final consolidation of quartz monzonite. Late stage magmatism coincident with tectonism produced structural traps such as breccia pipes, and may have been the source for the gold bearing fluids. FLIC had multiple roles in the development of the occurrences in the study area: as a host, the generation of structures during emplacement and consolidation, the initiation of orthomagmatic and convective hydrothermal systems, and as a source of mineralization. The interior occurrences can be considered as porphyry deposits in most aspects, except size. These occurrences may represent a small scale, gold dominated analogue of plutonic-type porphyry deposits.
44
Kressall, Ryan. "The petrology, mineralogy and geochemistry of the Cinder Lake alkaline intrusive complex, eastern Manitoba." 2012. http://hdl.handle.net/1993/5030.
Full textAbstract:
A suite of silica-undersaturated syenites outcrops along the margins of a monzogranite pluton emplaced in the Knee Lake greenstone belt at Cinder Lake, Manitoba. Alkali-feldspar syenitic pegmatite probably represents a cumulate unit derived from magma that subsequently evolved to fine-grained feldspathoid syenites. This evolution involved an increase in the degree of undersaturation from cancrinite-nepheline syenite to vishnevite syenite. Abundant calcite veinlets, showing a carbonatitic isotopic and trace-element signature, crosscut the pegmatite and are interpreted to have evolved from the syenites. The monzogranite and syenites gave similar radiometric ages (~2.72 Ga), but evidence of fenitization in the former suggests that the syenites are somewhat younger. The emplacement of these rocks was coeval with the collision of the North Caribou and North Superior superterranes during amalgamation of the Superior Province. The observed transition from granitic to alkaline magmatism is interpreted to mark the transition from a collisional to post-collisional tectonic regime.
45
Knight, Michael Don. "Volcanic evolution of the Koolau dike complex : determined from intrusive magma flow, anisotropy of magnetic susceptibility, and remanent magnetization directions." Thesis, 1989. http://hdl.handle.net/10125/9833.
Full text
46
Mysliveček, Jakub. "Petrologie a genetické vztahy alkalických intruzivních hornin roztockého intruzivního komplexu." Master's thesis, 2019. http://www.nusl.cz/ntk/nusl-411438.
Full textAbstract:
Roztoky Intrusive Center (33-28 Ma) is connected with tertiary volcanic activity in the territory of the Bohemian Massif (Czech Republic). It is located in the České středohoří volcanic complex on the tectonic line of the Ohře rift. The aim of this work was to petrologically describe local rocks and to verify the possible connection of the Roztoky Intrusive Center (RIC) with carbonatite magmatism, as could be suggested by the presence of alkaline rocks including their exotic types (essexites, monzodiorites, sodalitic syenites,…). It is assumed that there is a hidden carbonatite intrusion under the RIC caldera structure, which may also indicate geophysical manifestations of two hidden gravimetric minimas. In a detailed exploration of a drill core from the R-2 borehole from the 1960s, a petrographic rocks composition of a part of the caldera filling was described, including new find of xenolite of carbonatite in 286,5 m of R-2 borehole. By means of geochemical and micro-probe analyzes the well material including carbonatite was examined in detail. Carbonate mineralization with high REE contents was found in carbonatite, but also in the exocontact of the previously described silicocarbonatite (Rapprich et al. 2017). The discovery of carbonatite xenolite and the presence of minerals with high concentrations of...
47
Gleißner, Philipp [Verfasser]. "Petrogenesis of anorthosites of the Mesoproterozoic Kunene Intrusive Complex, NW Namibia: evidence from stable and radiogenic isotope and lithophile and highly siderophile trace element composition / vorgelegt von Philipp Gleißner." 2011. http://d-nb.info/1012215547/34.
Full text
48
"Seawater intrusion in complex geological environments." Universitat Politècnica de Catalunya, 2006. http://www.tesisenxarxa.net/TDX-0222107-105833/.
Full text
49
Fumerton, Stewart Lloyd. "The felsic intrusives In E.R.P.M., Boksburg." Thesis, 2015. http://hdl.handle.net/10539/17282.
Full text
50
Dunsworth, Sherry Mary. "Multiple intrusion and deformation within the northwestern quadrant of the plutonic complex, Troodos Ophiolite, Cyprus /." 1989. http://collections.mun.ca/u?/theses,74438.
Full text