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1
McQuarrie, Nadine, and Nadine McQuarrie. "The making of a high elevation plateau: Insights from the central Andean Plateau, Bolivia." Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/290035.
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The structural link that ties the formation of the central Andean plateau to the evolution of the Andean fold-thrust belt is formation and propagation of basement megathrusts. Balanced cross-sections through a regional west-vergent thrust system in the hinterland of the eastward-verging Andean fold-thrust belt suggest that the Altiplano basin is a crustal-scale, piggy-back basin created as a basement megathrust propagated up and over a half-crustal scale ramp located on the eastern edge of the Altiplano. The backthrust belt, detached above the basement thrust sheet, acted as a crustal-scale, passive-roof duplex building taper after the megathrust overextended the system eastward. Pervasive shortening and vertical elongation seen at the outcrop and regional scales supports the development of the backthrust belt as a taper-building mechanism. The interrelationship of the backthrust belt, basement megathrust, and Andean plateau is shown in a sequential, kinematic model based on balanced cross sections from the volcanic arc to the foreland. The model links the formation of the plateau to east- and west-verging portions of the Andean fold-thrust belt through the eastward propagation of two large basement megathrusts. The megathrusts can explain topographic and structural steps in the Andean fold-thrust belt and accommodate a minimum of 300-330 km of shortening which matches shortening estimates in the tightly folded and faulted cover rocks. To a first approximation, the eastern margin of the central Andean plateau (defined by the 3 km topographic contour) is contiguous with the leading edge of the upper basement megathrust. The relationship between the basement highs and the physiographic boundaries of the Andean plateau suggests that extensive megathrust sheets (involving strong rocks such as crystalline basement or quartzite) play an important role in the formation of the central Andean plateau. Combining the history of foreland basin migration with palinspastically restored regional cross sections across the Bolivian Andes between 18°-20°S argues for an eastward migrating fold-thrust belt/foreland basin system since the late Cretaceous. The longer time span for the Andean orogeny implies greater shortening amounts, a decrease in shortening rates with time and a high (3-4 km) Andean plateau by 20 Ma.
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Tallobre, Cedric. "Mise en évidence d’un système de dépôt contouritique et des processus sédimentaires associés sur le plateau de Demerara (marge guyanaise)." Thesis, Perpignan, 2017. http://www.theses.fr/2017PERP0002/document.
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Le plateau de Demerara est un plateau marginal situé le long de la marge de la Guyane française et du Surinam. Grâce aux données récentes acquises lors de la campagne IGUANES, avec des données géophysiques et des carottes sédimentaires, certaines structures sédimentaires illustrent une forte influence du courant sur la construction récente de cette marge.Les géométries sédimentaires suggèrent la présence d'un Système de Dépôt contouritique (CDS) sur ce plateau. Le fond marin est marqué par la présence de structures longitudinales formées par l'activité actuelle: « giant flute casts » ou queues de comètes et des « longitudinal waves ». Sur la base de l'analyse des données chirp et des carottes, la présence de processus contouritiques a été identifiée sur les plateaux marginaux intermédiaires et inférieurs. Cette contourite est probablement induite par la circulation de la NADW. Des structures sédimentaires sont présentes et enregistrées après cet événement : des « comet marks » et des « longitudinal waves ».Le contourite sur ce plateau est constitué de sédiments riches en illustrant le vannage induit par les courants de fond. L'étude des carottes sédimentaires associées à un cadre chrono-stratigraphique permet d'identifier les caractéristiques sédimentaires en fonction de l'intensité du courant. La glauconite, minéral authigénique, est utilisé comme un nouvel outil qui, couplé à des analyses granulométriques et de faciès, permet d’enregistrer les variations du vannage. Sur le plateau de Demerara, la sédimentation indiquent des taux d'accumulation sédimentaire faibles et des courants de fond intenses pendant les périodes glaciaires.La présence de contourites le long du plateau de Demerara et le long d'autres plateaux marginaux montre l'impact fort de tels reliefs bathymétriques sur la circulation océaniqueThe Demerara Plateau is a marginal plateau located along the French Guyana and Surinam margin. Thanks to the recent data acquired during the IGUANES cruise, with geophysical data and sedimentary cores, some sedimentary structures illustrate a strong current influence on the recent building of this margin. The sedimentary geometries suggest the presence of a Contourite Depositional System (CDS). The seafloor is marked by the presence of longitudinal structures formed by the current activity: giant flute clasts or comet marks, and longitudinal waves. Based on the chirp data analysis and on cores, some sedimentary domains are identified on the Demerara marginal plateau. The intermediate and the lower marginal plateaus are affected by contouritic process with two moats and a mounded elongated drift. This contourite is likely induced by the NADW circulation. The contourite on this plateau is made of glauconitic rich sediments inside the moat showing the winnowing effect induced by the bottom currents. The detailed study of sedimentary cores associated with a chronostratigraphic framework allows identifying the sedimentation features depending on current intensity through time. The glaucony authigenic mineral is used as a main proxy, coupled with grain-size and facies analyses, for inferring the degree of winnowing at the sediment-water interface. On the Demerara plateau, the sedimentation suggests low sediment accumulation rates and quite energetic bottom currents during ice periods.The presence of contourites along the Demerara Plateau and along other marginal plateaus shows the strong impact of such deep-sea marginal bathymetric reliefs on the oceanic circulation
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Cook, Kristen Lee. "The development of orogenic plateaus : Plateaus: case studies examining relationships between tectonics, crustal strength, surface deformation, and plateau morphology." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/45769.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2008.Includes bibliographical references.
This thesis addresses processes associated with the uplift, deformation, and erosion of orogenic plateaus. The timing and mechanisms of uplift of the Tibetan Plateau and the Altiplano are the subject of ongoing debate. Central issues include the strength of the lower crust and the role of lower crustal flow, the relative importance of continuous deformation versus block deformation, and the possibility of lithospheric delamination. The goal of this thesis is to further explore several of these issues using a combination of numerical modeling, field observations, and thermochronology. I investigate controls on the large-scale evolution of the Tibetan Plateau and the Altiplano using a new quasithree-dimensional viscous flow model that allows for both the development of a weak lower crust and lateral and temporal viscosity variations. Modeling motivated by the Tibetan Plateau shows that lateral variations in crustal strength can have a significant effect on surface velocities throughout the plateau, as well as on the location, shape, and slope of plateau margins and the overall plateau morphology. Model results suggest that crustal strength heterogeneities may be responsible for a number of seemingly unrelated aspects of Tibetan Plateau morphology and deformation. Modeling motivated by the Altiplano explores the relationship between subduction angle, the strength of the lower crust, crustal thickening, and surface shortening in the Central Andes. Model results illustrate that lower crustal flow above regions of steep-slab subduction can redistribute material along strike and can explain discrepancies between surface shortening and crustal thickness in the northern and southern Altiplano. I address the distribution of Middle Cenozoic deformation on the eastern margin of the Tibetan Plateau by using field observations and thermochronology to document an episode of extension and constrain its timing to the Oligocene. Finally, I examine the response of a major river system to flow over an abrupt plateau margin by using topographic data, cosmogenic nuclide dating, and numerical modeling to describe the incision history of the Colorado River into the southwestern Colorado Plateau.
by Kristen Lee Cook.
Ph.D.
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Mercier, de Lepinay Marion. "Inventaire mondial des marges transformantes et évolution tectono-sédimentaire des plateaux de Demerara et de Guinée." Thesis, Perpignan, 2016. http://www.theses.fr/2016PERP0004.
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Les marges transformantes, formées par le coulissage des plaques lors des premières étapes de l’ouverture océanique, ont été peu étudiées relativement aux marges divergentes. La marge de Côte d’Ivoire-Ghana fait figure d’exemple-type, et l’absence d’inventaire exhaustif ainsi que le peu d’étude de marges transformantes conjuguées entraîne une méconnaissance de la véritable diversité de ce type de marge. Deux approches ont été abordées dans ce mémoire. La première a consisté à les inventorier dans le monde à partir d’une méthodologie simple. Elles ont ensuite été comparées (physiographie et structure). La deuxième s’est concentrée sur l’étude tectono-sédimentaire des marges transformantes conjuguées des plateaux de Demerara et de Guinée. L’inventaire des marges transformantes a montré que les marges transformantes représentent 30% des marges passives. Leur distribution au sein de domaines océaniques ouverts de façon très oblique ou à l’intersection entre grands domaines reflète des conditions d’initiation spécifiques. 30% des marges transformantes se trouvent notamment en bordure d’un plateau marginal ; un type de bassin à l’histoire double nouvellement défini, qui semble associé à un fort amincissement crustal. Par ailleurs, on montre que les marges transformantes présentent des architectures diverses et sont souvent segmentées. L’étude des plateaux marginaux de Demerara et Guinée a permis de montrer qu’elles se mettent en place au niveau d’un domaine pré-aminci, sans doute guidées par des structures préexistantes. La nature du soubassement des plateaux est discutée : éventails sédimentaires ou volcaniques type SDR. La formation et l’évolution des marges transformantes en bordure des deux plateaux a été accompagnée de déformations intenses à l’approche des frontière océan-continents ainsi que de plusieurs épisodes de soulèvement et subsidence successifs de la bordure transformante, dont les origines et mécanismes sont discutésTransform margins form by transform motion between plates during early stages of oceanic spreading. They have been poorly studied in comparison with divergent margins, at least for the last 15 years. The Côte d’Ivoire-Ghana margin represents the best known example of a transform margin and is often considered as a model. However, the lack of a global complete inventory of such margins may lead to underestimate their diversity. Two approaches have been developed in this work. The first one consisted in a compiling world transform margins using a systematic and simple methodology. Those margins have then been compared (physiography, structure). In a second approach we analysed the tectono-sedimentary evolution of the Demerara and Guinea conjugated transform-derived plateaus. The worldwide review of transform margins shows that those represent 30% of the existing passive margins. Their distribution inside very oblique oceanic domains, and at the intersection between oceanic domains of contrasted ages, reflects specific initiation conditions. 30% of those transform margins locate on the edge of marginal plateaus —newly defined type of basins— that seem to be associated with important crustal thinning. Furthermore, this inventory shows that transform margins display a great variety of architectures. The Demerara and Guinea marginal plateaus are bounded by transform margins that occur on an already thinned crust, probably along a preexisting structure. The nature of these plateaus basement is discussed: sedimentary or volcanic SDRs fan-shaped units? During the Equatorial Atlantic opening, the formation and evolution of Demerara and Guinea transform margins were accompanied by intense deformations close to the continent-ocean boundary and by several successive uplift and subsidence phases along the plateaus borders. Their origin and mechanisms are discussed
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Vernon, Rowan Emma. "Tectonic evolution and plateau uplift around the Changma Basin in the Qilian Mountains, NE Tibetan Plateau." Thesis, University of Leicester, 2016. http://hdl.handle.net/2381/37964.
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The Qilian Mountains are one of the most actively uplifting regions of the Tibetan Plateau and may provide a type example for the early evolution of its older regions. The mountains form a 300 km wide, NW – SE trending fold-thrust belt which extends 1000 km along the northeast margin of the Plateau and over-thrust the Hexi Corridor to the northeast and the Qaidam Basin to the southwest. An early-mid Palaeozoic orogenic suture belt, composed of faulted terranes of Late Proterozoic to early-mid Palaeozoic meta-sedimentary and meta-volcanic strata, is exposed in the Qilian Mountains and has been previously suggested to be reactivated by Late Cenozoic deformation. NE-directed crustal shortening, associated with the far-field effects of the Indo-Asian collision, has been active in the Qilian Mountains since the early-mid Miocene. It is characterised by the uplift of high mountain ranges along crustal scale thrust faults which splay south-eastwards from the sinistral-slip, north-northeast trending Altyn Tagh Fault and are postulated to connect along a shallow-dipping decollement in the midlower crust. Initiation of uplift in the Qilian Mountains was associated with a considerable decrease in the slip rate along the eastern end of the Altyn Tagh Fault and coincides with a plateau-wide reorganisation of deformation. This project presents new field mapping and remote sensing analysis and integrates this with existing geophysical data to i) understand and constrain the tectonic evolution of the northeast corner of the Qilian Mountains and the northwest corner of the Hexi Corridor, ii) examine the structural and lithological control of the Palaeozoic accretionary crust over Late Cenozoic deformation within the mountain ranges, and iii) establish the spatial and temporal extent of different styles of deformation within the northeastern Qilian Mountains.
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Caporale, Roberto. "Problema di Plateau e superfici minime." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
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Il problema di Plateau, che prende il nome dal fisico belga Joseph Plateau, consiste nella ricerca della superficie che, tra tutte quelle aventi un determinato bordo, abbia area minima.
Già nel 1744 Eulero si era proposto di cercare la superficie di area minima avente come bordo due circonferenze poste su piani paralleli i cui centri appartengono ad una retta ortogonale ad entrambi. Tale superficie è la catenoide.
Molti matematici cercarono soluzioni del problema di Plateau: Lagrange nel 1762, introdusse il termine superfici minime e determinò l'equazione che doveva essere soddisfatta dalle superfici di area minima, la cosiddetta equazione di Eulero-Lagrange;
Mesnieur nel 1776 scoprì un'altra superficie minima, l'elicoide e dimostrò che le superfici di area minima hanno curvatura media nulla in ogni punto.
Monge nel 1783 dimostrò che, nel caso di superfici esprimibili come grafico di funzioni differenziabili, superfici con curvatura media nulla e superfici di area minima coincidono.
Solo nei primi anni del '900 si ebbero soluzioni generali del problema di Plateau, grazie ai lavori di Tibor Radò e Jesse Douglas. Quest'ultimo venne premiato nel 1936 con la medaglia Fields.
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Heyman, Jakob. "Palaeoglaciology of the northeastern Tibetan Plateau." Doctoral thesis, Stockholm : Department of Physical Geography and Quaternary Geology, Stockholm University, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-38689.
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Diss. (sammanfattning) Stockholm : Stockholms universitet, 2010.At the time of doctoral defence the following publications were unpublished and had a status as follows: Nr 1: Manuscript in press; Nr 2 and 3: Manuscripts.
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Morén, Björn. "Palaeoglaciology of the central Tibetan Plateau." Thesis, Stockholm University, Department of Physical Geography and Quaternary Geology (INK), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-43145.
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The glacial history of the Tibetan Plateau has long been a contentious topic with widely different reconstructions. For Tanggula Shan, an extensive mountain range on the central Tibetan Plateau, multiple glacial reconstruc- tions and studies on the glacial chronology have been presented. However, the glacial geomorphological record has been sparse resulting in insufficient data to fully infer the area’s palaeoglaciology. Focussing on four landform categories, glacial valleys, marginal moraines, hummocky terrain, and glacial lineations; a glacial geomorphological map was produced, using Landsat 7 ETM+ satellite imagery, SRTM digital elevation model, and Google Earth. This map, together with GIS analyses and available cosmogenic exposure and electron spin reso- nance ages from the study area, was used to investigate the extent of former glaciations. Cosmogenic exposure and electron spin resonance ages range from 18.4 ± 1.6 to 203.4 ± 33.2 ka (recalculated using the CRONUS calculator). The extent of the glacial footprint is restricted to the high mountain areas, and is similar in extent to earlier glacial reconstructions. This glacial footprint can tentatively be explained by a monsoonal influence in the southeast, with the influence diminishing to the northwest. Alternatively, the precipitation gradient might have resulted in cold-based ice in the west and warm-based ice in the east. These variations in ice regime could have left fewer traces of glaciation in the west, than in the east. There is no evidence supporting an ice sheet covering the entire Tibetan Plateau. Rather, the available data support a smaller ice field in the high mountain areas, with a maximum extent well before the Last Glacial Maximum.
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Sun, Zhian. "Radiation budget over the Tibetian Plateau." Thesis, University of Reading, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315561.
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Clément, Jean-Marie. "L'hôpital : de l'hébergement au plateau technique." Paris 1, 1986. http://www.theses.fr/1986PA010277.
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Institution séculaire, l'hôpital sous la pression des découvertes médicales et de l'élévation du niveau de vie de la population française s'est ouvert au milieu du vingtième siècle à toutes les classes de la société. De la loi du 21 décembre 1941 date la naissance juridique d'une nouvelle institution hospitalière désormais orientée principalement d'abord, puis exclusivement ensuite (loi du 31 décembre 1970), vers les soins. L'hôpital, institution charitable, devient une "entreprise" de soins bouleversant totalement son organisation et sa gestion. L'hôpital s'adapte aux besoins de la population, aux exigences de la science médicale et aux nécessités d'une gestion économe et participative. Cette évolution tend a séparer complètement voire à rendre financièrement antagoniste le rôle hôtelier originel et le rôle tout récent de prestataire de soins à haute valeur ajoutée. L'hôpital "hôtel" laisse place à l'hôpital "plateau technique". Cependant, pendant de nombreuses années ces deux activités coexisteront entraînant les adaptations juridiques idoinesUnder the pressure of medical discoveries and French people high standard of living, hospitals which are an age-long institution opened to all classes of society in the middle of the twentieth century. The legal birth of a new hospital institution dates from 1941 december 21st Law, it was first principally and now exclusively directed towards medical care. Hospitals, charity institution, become a care undertaking upsetting totally its organisation and management. Hospitals fit to population needs, medical science requirements and economical and participative management necessities. This evolution leads to keep completely apart and even financially opposed the original lodging part and the new highly specialized medical care part. "hotel" hospitals let place to medico-technical department. Meanwhile, for many years, these both activities will live together, involving juridical suitable accommodations
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Atwell, Ricky Gilmer. "Subsistence variability on the Columbia Plateau." PDXScholar, 1989. https://pdxscholar.library.pdx.edu/open_access_etds/4048.
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Long-term human dietary change is a poorly understood aspect of Columbia Plateau prehistory. Faunal assemblages from thirty-four archaeological sites on the Plateau are organized into fifteen aggregate assemblages that are defined spatially and temporally. These assemblages are examined in terms of a focal-diffuse model using ecological measures of diversity, richness and evenness. Variability and patterning in the prehistoric subsistence record is indicated. Major trends in human diet and shifts in subsistence economies are documented and the relationship between subsistence and some initial semi-sedentary adaptations on the Plateau is clarified.
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Schildgen, Taylor F. (Taylor Frances). "Surface uplift, fluvial incision, and geodynamics of plateau evolution, from the western margin of the Central Andean plateau." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/45774.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2008.Includes bibliographical references.
The Colca-Majes and Cotahuasi-Ocona rivers in southwest Peru that cut through the western margin of the Andean plateau en route to the Pacific Ocean incised canyons over 3 km deep in response to late Cenozoic surface uplift. This latest uplift represents a fundamental shift in the style and magnitude of surface deformation that had been ongoing since at least late Cretaceous time, but only relatively recently created what represents the only major barrier to atmospheric circulation in the Southern Hemisphere. Studying canyon incision history as a proxy for surface uplift offers a promising route to understanding how climate and tectonics have interacted throughout the evolution of the Central Andean plateau. In this thesis, a combination of bedrock low-temperature thermochronology (apatite and zircon (UTh)/He techniques), 40Ar/39Ar dating of valley-filling volcanic flows, and three-dimensional thermal modeling using a modified version of Pecube were applied to investigate the incision history of the rivers. Results suggested between 2.6 and 3.0 km of incision occurred in the deepest reaches of the canyons starting at ca. 10 to 11 Ma and ending between 2.3 and 3.5 Ma. The onset of surface uplift that is likely to have driven incision probably did not precede incision by more than one million years, although incision may have continued long after surface uplift ceased. The magnitude and timing of uplift that we infer is in broad agreement with uplift documented along the western margin in northern Chile, in the interior of the Andean plateau, and the eastern margin. Additional work on the style of structural accommodation of this uplift provide important context for interpreting what potential geodynamic mechanisms may have been responsible for this latest tectonic activity. Structural mapping revealed an early history of predominantly reverse fault activity that probably generated the first significant topography in the Central Andes. This compressional period was succeeded by a phase of longwavelenth warping deformation and normal kinematic movement on high-angle faults.
(cont.) This later activity appears to have continued through the latest phase of uplift documented through river incision history, hence was likely responsible for accommodating uplift. Given the broadly synchronous timing of late Cenozoic uplift across the Andean plateau and the style of structural accommodation documented on the western margin, two possible geodynamic mechanisms appear most feasible for generating this latest phase of uplift: lithospheric delamination, and redistribution of ductile material through mid- to lower-crustal flow. Our initial studies of coastal uplift suggest that each is likely to have played a role, although additional work is required to understand how important each may have been in generating uplift.
by Taylor F. Schildgen.
Ph.D.
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Yang, Chao. "Geology, geochronology, stable isotope, and sulfides of the Tiegelongnan porphyry-epithermal Cu (Au) deposit, Tibet, China." Doctoral thesis, Université Laval, 2020. http://hdl.handle.net/20.500.11794/67954.
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Yang, Wei-Ning. "'That's not what I signed up for!' : a longitudinal investigation of the impact of unmet expectation in the relation between career plateau and job outcomes." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/thats-not-what-i-signed-up-for-a-longitudinal-investigation-of-the-impact-of-unmet-expectation-in-the-relation-between-career-plateau-and-job-outcomes(b2561081-5a96-4665-9678-323a505aa8c8).html.
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The changing working environment and ageing workforce suggest that many workers will inevitably reach a career plateau, a stage where people regard future promotions as unlikely, or no longer feel challenged at work. Experiencing career plateau is found to be associated with negative job attitudes and performance in the workplace. However, existing studies have been mainly cross-sectional in design and few of them investigate the mechanisms and the conditions that influence the negative relationship. This study follows a quantitative longitudinal research design to further enhance the understanding of the relationships between career plateau and job outcomes. The job outcomes in this research include work attitudes such as job satisfaction, organisational commitment, turnover intentions and three aspects of job performance. Specifically, the three research aims of this thesis are: (1) to understand the causal directions between career plateau and job outcomes, (2) to examine whether employees’ unmet expectations may explain these relations and (3) to investigate whether employees’ age may modify the mediation effects of career plateau on job outcomes via unmet expectations. Three waves of data were collected from working individuals in various industries over an eight-month period. The majority of the participants were working in the UK or in Taiwan. Results showed that unmet expectations partially explain the negative relationship between career plateau and job attitudes over time but not for job performance. Furthermore, age did not affect the strength of the mediation effect of career plateau on the job outcomes through unmet expectations. The significance of this research is three-fold. First, it provides a new explanation for the unfavourable work attitudes of plateaued individuals. The findings that career plateaued employees have lower job satisfaction, lower organisational commitment and higher turnover intentions can partly be explained by unfulfilled expectations in receiving promotions or challenging tasks. Second, the study signals the danger of career plateau at any age, as younger and older workers were found to be equally influenced by career plateau. Finally, this is the first study in the area that seeks to resolve the debate over the directional relationship between career plateau and job outcomes. The implications in theory and in practice, limitations and suggestions for future research directions are discussed.
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Revillon, Sidonie. "Origine et composition du plateau océanique Caraïbe." Phd thesis, Université Rennes 1, 1999. http://tel.archives-ouvertes.fr/tel-00145360.
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Le plateau Caraïbe s'est formé, sans doute dans le Pacifique, par la fusion de la tête d'un panache mantellique. Il s'est ensuite accrété autour des Caraïbes et sur la côte ouest de l'Amérique du sud. Nous avons étudié des échantillons de l'île de Curaçao et de la ride de Béata, dans les Caraïbes, et de l'île de Gorgona dans le Pacifique. Ces échantillons sont des roches volcaniques (basaltes, komatiites et picrites) ou plutoniques (gabbros, dolérites, dunites et wehrlites). Nos méthodes sont celles de la pétrologie et de la géochimie élémentaire et isotopique (Nd, Sr, O).La ride de Béata est formée de gabbros et de dolérites. Ces roches, comme celles de Curaçao, dérivent de liquides basaltiques et montrent des spectres de terres rares (TR) plats. Leur source est isotopiquement appauvrie. L'âge des roches de Béata suggère une longue histoire magmatique pour la formation du plateau en trois épisodes (90 Ma, 76 Ma et 55 Ma).
Toutes les roches plutoniques de Gorgona (gabbros, dunites et wehrlites) dérivent de liquides basaltiques montrant des spectres de TR plats ou appauvris en TR légères. Les picrites et les komatiites dérivent de liquides ultra-magnésiens appauvris ou très appauvris en TR légères. Les compositions isotopiques de Nd indiquent deux sources mantelliques : une appauvrie et une plus enrichie (epsilon Nd +10 et +6). La similitude des rapports d'éléments incompatibles et des compositions isotopiques suggère que certaines roches plutoniques dérivent par différenciation des liquides komatiitiques. Ces magmas se mettent ensuite en place dans des sills à faible profondeur.
Les conclusions principales sont :
(a) le système d'alimentation du plateau est complexe
(b) les liquides parents sont hétérogènes : ultra-magnésiens ou basaltiques, appauvris ou non en éléments incompatibles. La source comprend un composant enrichi et un composant appauvri.
(c) la tête du panache est zonée. Ceci est lié au processus de fusion partielle. Au cœur, de haute température, les liquides ultra-magnésiens se forment. Un processus de fusion fractionnée avancé permet de former des liquides très appauvris et l'échantillonnage du composant appauvri. Dans les bordures, plus froides, les liquides basaltiques se forment par des taux de fusion fractionnée moindres, ce qui favorise l'échantillonnage du composant enrichi. Ces liquides sont ensuite homogénéisés et acquièrent des signatures géochimiques uniformes.
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Moss, Jasmin Elizabeth. "Canine echinococcosis in the eastern Tibetan plateau." Thesis, University of Salford, 2011. http://usir.salford.ac.uk/26828/.
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Echinococcosis caused by E.granulosus or E.multilocularis is a chronic, debilitating and potentially fatal zoonotic cestode disease of humans. The natural primary definitive host for E.granulosus is the domestic dog and for E.multilocularis it is wild foxes. In areas of the eastern Tibetan plateau, it was suspected that the domestic dog played a vital role in the transmission of both species of parasite to man, contributing to some of the highest prevalence rates globally. A new species, E.shiquicus is distributed sympatrically in the same location but its zoonotic potential was unknown. In order to investigate the role of canids in transmission of E.shiquicus, E.granulosus and E.multilocularis, 197 faecal samples from Tibetan foxes (Vulpes ferrilata) in Sichuan, Qinghai and Tibet Autonmous Region (TAR) and more than 600 faecal samples from owned domestic dogs in Sichuan were collected and analysed by an Echinococcus genus specific coproantigen- ELISA and three species specific copro-PCR tests. The copro-ELISA was shown to have a sensitivity of 86.6% for E.granulosus and 72.7% for E.multilocularis. The specificity was 100% when compared with faecal samples from other taeniid tapeworm infections. Copro-PCR tests were considered the most specific for use in the eastern Tibetan plateau co-endemic communities. The primary objective endeavoured to understand the role of the domestic dog in maintaining transmission of E.multilocularis in Shiqu County, Sichuan. A cohort of 308 dogs were followed up for one year after a single treatment with praziquantel for a re-infection study at 2 month, 5 months and 12 months. This research was the first to confirm E.multilocularis is found in foxes across the plateau into central TAR. The prevalence ranged from 2.6% to 25% dependant on location. In foxes E.shiquicus was distributed ~350 miles west of Shiqu County (where it was first described) at a prevalence of 6.1% and the prevalence appeared to be increasing along a gradient from north to south of the plateau. No dog faecal samples were positive for E.shiquicus DNA. The prevalence of E.multilocularis in dogs reached 8.9% in one endemic foci (Shiqu County) whilst E.granulosus was distributed evenly across the study sites. There was no significant difference between the prevalence of E.multilocularis in the dog and fox populations. The re-infection study of dogs demonstrated they are Echinococcus copro-ELISA test positive at a prevalence of 8.4% after 2 months, 2.2% after 5 months and 9.5% after 12 months. No positive copro-PCR results were obtained at 5 months and 12 month post treatment however knowledge of the parasite biology and host availability/behaviour meant that some assumptions could be made. It was considered that the infection pressure to dogs from small mammals infected with E.multilocularis is at a peak in the late spring to early summer whilst the infection pressure from livestock infected with E.granulosus to dogs is at a peak in late autumn to early winter. Furthermore, the data indicated that dogs may have the ability to maintain E.multilocularis transmission without the input of a fox definitive host. This was based on the significant reduction in copro-prevalence 12 months post treatment and the probable effect the dosing had on transmission of E.multilocularis to small mammals in the research area. The only significant risk factor for dog echinococcosis in the current study was the release of dogs at night by owners which allows them to roam in the villages. It was thought that these dogs have more access to small mammals or livestock carcasses infected with Echinococcus spp. Identification of peak Echinococcus transmission periods are discussed with a view to control via dog dosing schemes on the plateau.
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Middleton, Timothy A. "Active tectonics of the Ordos Plateau, China." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:d03e3b5b-6056-4021-bab2-85316d64bd1c.
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This thesis is concerned with the active tectonics of the Ordos Plateau in northern China, an apparently non-deforming portion of continental lithosphere that sits at the northeastern edge of the India-Eurasia collision zone. Numerous, large-magnitude, historical earthquakes have occurred at the margins of the plateau, including some of the deadliest earthquakes in recorded human history. Furthermore, the adjacent North China Plain is one of the most densely populated regions on the planet, meaning that reliable seismic hazard assessments are of paramount importance. We investigate the 1739 Yinchuan earthquake, on the western side of the Ordos Plateau, using 14C dating and a new high-resolution Pleiades DEM of the entire rupture. We find that the event took place on the East Helanshan Fault and had a magnitude in the range Mw 7.1 to Mw 7.6, smaller than previously suggested. We then use IRSL and 10Be dating, along with high-resolution Pleiades DEMs, to determine a right-lateral slip rate on the Luoshan Fault of 4.3±0.4 mm/a and a throw rate on the East Helanshan Fault of < 0.8±0.1 mm/a, indicating that north-south right-lateral shearing is the predominant tectonic motion on the western side of the Ordos Plateau. In the northern Shanxi Grabens, at the northeastern corner of the plateau, we observe good agreement between Quaternary, seismic and geodetic rates of strain, and we find that the region is extending at around 1 to 2 mm/a at an azimuth of approximately 151°. However, there is a notable seismic strain rate deficit since 1750, which could indicate that we are quite late in the earthquake cycle with the potential for large earthquakes in the relatively near future. Finally, we combine our results with information from the literature to propose a kinematic model for the whole Ordos Plateau. We suggest that the plateau behaves as a pinned block, rotating anticlockwise within a large-scale WNW-ESE left-lateral shear zone. The previously enigmatic normal faulting at the margins of the Ordos block can then be explained as wedge-shaped grabens that develop during widening of the overall zone, or en echelon features that accommodate principally right-lateral motion.
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Rea, Brice R. "Plucking and abrasion beneath temperate plateau icefields." Thesis, Queen's University Belfast, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239228.
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Chantong, Wanida. "Structural evolution of the Khorat Plateau, Thailand." Thesis, University of Leeds, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421979.
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BONAN, CATHERINE. "La reconstruction microchirurgicale du plateau maxillo-palatin." Amiens, 1993. http://www.theses.fr/1993AMIEM073.
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Revillon, Sidonie. "Origine et composition du plateau oceanique caraibe." Rennes 1, 1999. http://www.theses.fr/1999REN10120.
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Le plateau caraibe s'est forme, sans doute dans le pacifique, par la fusion de la tete d'un panache mantellique. Il s'est ensuite accrete autour des caraibes et sur la cote ouest de l'amerique du sud. Nous avons etudie des echantillons de l'ile de curacao et de la ride de beata, dans les caraibes, et de l'ile de gorgona dans le pacifique. Ces echantillons sont des roches volcaniques (basaltes, komatiites et picrites) ou plutoniques (gabbros, dolerites, dunites et wehrlites). Nos methodes sont celles de la petrologie et de la geochimie elementaire et isotopique (nd, sr, o). La ride de beata est formee de gabbros et de dolerites. Ces roches, comme celles de curacao, derivent de liquides basaltiques et montrent des spectres de terres rares (tr) plats. Leur source est isotopiquement appauvrie. L'age des roches de beata suggere une longue histoire magmatique pour la formation du plateau en trois episodes (90 ma, 76 ma et 55 ma). Toutes les roches plutoniques de gorgona (gabbros, dunites et wehrlites) derivent de liquides basaltiques montrant des spectres de tr plats ou appauvris en tr legeres. Les picrites et les komatiites derivent de liquides ultra-magnesiens appauvris ou tres appauvris en tr legeres. Les compositions isotopiques de nd indiquent deux sources mantelliques : une appauvrie et une plus enrichie (epsilon nd + 10 et + 6). La similitude des rapports d'elements incompatibles et des compositions isotopiques suggere que certaines roches plutoniques derivent par differenciation des liquides komatiitiques. Ces magmas se mettent ensuite en place dans des sills a faible profondeur. Les conclusions principales sont : (a) le systeme d'alimentation du plateau est complexe (b) les liquides parents sont heterogenes : ultra-magnesiens ou basaltiques, appauvris ou non en elements incompatibles. La source comprend un composant enrichi et un composant appauvri. (c) la tete du panache est zonee. Ceci est lie au processus de fusion partielle. Au cur, de haute temperature, les liquides ultra-magnesiens se forment. Un processus de fusion fractionnee avance permet de former des liquides tres appauvris et l'echantillonnage du composant appauvri. Dans les bordures, plus froides, les liquides basaltiques se forment par des taux de fusion fractionnee moindres, ce qui favorise l'echantillonnage du composant enrichi. Ces liquides sont ensuite homogeneises et acquierent des signatures geochimiques uniformes.
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Robinson, Danielle D. Sandvol Eric Alan. "Seismic anisotropy beneath the southern Puna Plateau." Diss., Columbia, Mo. : University of Missouri--Columbia, 2009. http://hdl.handle.net/10355/5362.
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The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Title from PDF of title page (University of Missouri--Columbia, viewed on December 30, 2009). Thesis advisor: Dr. Eric Sandvol. Includes bibliographical references.
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Cebula, Larry. "Religious change and Plateau Indians: 1500 -1850." W&M ScholarWorks, 2000. https://scholarworks.wm.edu/etd/1539623971.
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This study is an ethnohistorical examination of Indian religious responses to contact with Euroamericans on the Columbia Plateau, from 1600 to 1850. Plateau natives understood their encounter with European civilization primarily as a momentous spiritual event, and sought new sources of spiritual power to cope with their rapidly changing world. White people seemed to the Indians to have an abundance of spirit power, and many native religious efforts were aimed at capturing some of this power for themselves. These efforts included the protohistoric Prophet Dance, the syncretic "Columbian Religion" of the fur trade era, and the initial enthusiastic response to the first Christian missionaries on the Plateau. Each of these attempts was marked by great enthusiasm at first, and each was abandoned with bitter disappointment as the material condition of the natives worsened. By 1850, most Indians had abandoned the idea that the spirit power of the white people could ever be accessed by themselves, and new religious impulses took the form of nativist movements which sought to purge the natives of white influences.;Because both Roman Catholic and Protestant missionaries were active on the Plateau, I also compare the conversion efforts of the two faiths. to native eyes, the cultural flexibility, language skills, impressive ceremonies, and superior organizational structure of the Catholics compared favorably to the stem and incomprehensible doctrines of the Protestants. But in both cases most Indians accepted Christian doctrines only as a supplement, and not as a replacement of native beliefs. True converts proved rare before the reservation period.
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Chen, Peng. "Active Tectonics of the Northeastern Tibetan Plateau." Kyoto University, 2019. http://hdl.handle.net/2433/245308.
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Matsubara, Pereira Felipe <1991>. "Paleofire activity reconstruction in the Tibetan Plateau." Master's Degree Thesis, Università Ca' Foscari Venezia, 2017. http://hdl.handle.net/10579/10154.
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Biomass burning as a natural process producing greenhouse gases may influence both regional and global climate, and it has become of planetary concern due to anthropogenic activities (Simoneit, 2000; Hopmans et al., 2012; Zennaro et al., 2014). The present work gives information about past fire events in the Tibetan Plateau and helps to increase the understanding of the interaction between Holocene's climate and fire activity. Tibetan Plateau is located in Asia, which is known to be the Earth's largest and most populated continent, and its extension is approximately 1,000 km north to south and 2,500 km east to west, with an average elevation exceeding 4,500 m. We reconstructed biomass burning events of the last 10,500 years recorded in sediments collected from lake Paru Co (4,845 m above sea level), a small moraine dammed lake located on the South-Eastern Tibetan Plateau. Sediment samples were extracted using accelerate solvent extraction and different organic molecular proxies were analysed by GC-MS and IC-MS. We used monosaccharide anhydrides, levoglucosan and its isomers and polycyclic aromatic hydrocarbons as proxies for biomass burning. These are specific molecular markers originated from the pyrolysis of cellulose showing significant fire events and indicate changes in burned fuel. The relationship between this multi-proxy approach and climatic, meteorological and charcoal data allows the reconstruction and contextualization of past fire events and suggests a correspondence between dry climate period and presence of more intense fire events, especially in the Early Holocene.
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Mellmann-Brown, Sabine. "The regeneration of whitebark pine in the timberline ecotone of the Beartooth Plateau, Montana and Wyoming." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=967353505.
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Wang, Baolai. "Some aspects of plateau permafrost, Qinghai-Xizang (Tibet) Plateau, China, and a comparison with the Mackenzie Delta region, Canada." Thesis, University of Ottawa (Canada), 1993. http://hdl.handle.net/10393/6840.
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Differences in permafrost conditions between the Qinghai-Xizang (Tibet) Plateau and the Mackenzie Delta region primarily relate to their Quaternary histories and their current climates. For example, the Tibetan Plateau has experienced uplift of at least 3,000 m during the last 2 million years. Under the present climatic conditions, the lower altitudinal limit of the plateau permafrost in the north is at 4,150 m a.s.l. This suggests that if the Plateau were 1,000 m lower than its present elevation, there would be no permafrost. During the Quaternary, the Tibetan Plateau remained unglaciated. This has meant that little water was available for the formation of massive ground ice, in contrast to the Mackenzie Delta region. Located at 68-69$\sp\circ$N, the Mackenzie Delta region experiences a combination of low air temperature in winter, a long solar night and a short thaw period in summer. The result is a relatively thin active layer. Located at 30-34$\sp\circ$N, the Tibetan Plateau experiences much higher solar insolation, and a diurnal temperature rhythm. The thickness of the active layer is much greater than in the Mackenzie Delta region and varies between 1.3 and 3 m or more. Permafrost on the Tibetan Plateau is much warmer and thinner than that in the Mackenzie Delta region. One consequence is that it is more sensitive to any changes in climate and surface conditions. Deep ground temperatures in the Pleistocene Mackenzie Delta indicate a recent warming trend, while a cooling trend in the Modern Delta likely relates to local factors such as channel shifting and emergence and/or sedimentation in the Mackenzie River. Water bodies are a cause of geothermal disturbances common to both regions. Numerical simulation of rapid coastal retreat in the Mackenzie Delta region indicates that subsea permafrost is at least 3$\sp\circ$C warmer than adjacent terrestrial permafrost. On the Tibetan Plateau, faulting also disturbs the geothermal regime. Measurements of in situ permafrost creep in the Fenghuo Shan area are one indicator of the warmer permafrost temperatures on the Tibetan Plateau. The average creep velocity ranges from 0.16 cm/year at 2.8 m depth to 0.54 cm/year at 1.6 m depth. These velocities are greater than those recently obtained from the High Arctic of Canada and are approximately of the order of magnitude as those obtained in the Mackenzie Valley. Inter-continental comparison of creep data suggests that climate controls the regional (large scale) magnitude of creep, and that ground ice is a local factor controlling creep rate in a particular area or site. A constitutive relationship (secondary creep power flow law) was applied to the field creep data; and creep parameters A and n were determined for each of the three different depths in the West Valley, Fenghuo Shan area, Tibetan Plateau.
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Gabler, Brandon Michael. "PANARCHY ON THE PLATEAU: MODELING PREHISTORIC SETTLEMENT PATTERN, LAND USE, AND DEMOGRAPHIC CHANGE ON THE PAJARITO PLATEAU, NEW MEXICO." Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/195831.
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LA-UR-09-02500A wide range of theories - resilience theory and the study of complex adaptive systems, for example - are advancing our understanding of anthropological systems. Recently, anthropologists have applied the panarchy framework to study socionatural systems. This framework allows researchers to assess growth, conservation, release, and reorganization in this nested-cycle model that operates simultaneously at multiple spatio-temporal scales. The long time-depth of the archaeological record is a critical factor in our ability to investigate human behavior within the panarchy's set of nested adaptive cycles.Archaeological investigation in the US Southwest has focused on processes of aggregation and culture change due to varying environmental and social conditions; the Pajarito Plateau, NM, has been the subject of archaeological research since the late 1800s. The Los Alamos National Laboratory portion of the Plateau has been thoroughly surveyed for cultural resources, but has received less attention by scholars than surrounding areas, including Bandelier National Monument. I use the panarchy framework to build a model of Puebloan settlement, land use, demography, and adaptation to assess the utility of the panarchy model for anthropological systems and fill a void in archaeologists' understanding of the Puebloan Southwest.I analyze patterns of residential and agricultural land use during the Rio Grande Coalition and Classic periods (A.D. 1150-1600) for the Pajarito Plateau. I conclude that there is no major change in the use of various landscape ranges between these periods. I reconstruct regional Puebloan momentary population and investigate recent evidence that supports a San Juan Basin source of the dramatic population increase during the Late Coalition. I also investigate aggregation into large plaza pueblos, the development of craft specialization, agricultural intensification, architectural change, and increased participation in the wider Rio Grande marketplace economy as responses of households, clans, villages, and the entire Pajarito population to the highly fluctuating climate of the local landscape. I address these results within the panarchy framework. Further, I argue that the Pajarito Plateau system continued after the population dispersed into the Rio Grande Valley below, to be closer to reliable sources of water and the growing Rio Grande economy.
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Iskandar, Denise. "La diatomite miocène de la montagne d'Andance, carrière de Saint-Bauzile (Ardèche, France) : étude palynologique - écostratigraphie - paléoclimatologie." Lyon 1, 1988. http://www.theses.fr/1988LYO10135.
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Analyse palynologique de deux sondages et d'une coupe du turolien inferieur de la montagne d'andance. Description des differents types de formations vegetales d'apres les donnees des spectres polliniques. Definition d'assemblages palynologiques a partir de l'etude des variations quantitatives des faxons. Conclusions paleoclimatiques et paleoenvironnementales. Le milieu etait fluviolacustre, dans une zone temperee chaude avec une humidite importante
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Peng, Rong, and 彭蓉. "Erosion in the Loess Plateau : scales and silos of the grain to green project, 1999-2003." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/207139.
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This thesis explores the relationship between environmental restoration and social-economic factors. It focuses on the erosion treatment on the Loess Plateau, especially the Grain to Green Project (GGP), the biggest national-range environmental treatment program in China in recent years. GGP produced significant impact on local landform, landuse and livelihood. On one hand, the program effectively controlled torrent by increasing soil aggregation; on the other hand, it lacked long-term perspectives and had underestimated the complexity of the environment and of local residents.
The thesis seeks to bridge the gaps between soil treatment policy and the actual effect. Research was conducted on soil erosion across multiple scales and key issues are generated based on typical cases. Findings from the research serve as guidelines for the following design proposition. The design applies hierarchical method, including both top-down and bottom-up interventions. First, a division method for erosion states was developed which can divide the erosion problem within the range of the yellow river into small catchment basins. Second, a typical catchment basin was selected as an example to show proposed strategy in three scales: catchment, slope and patches. The core design idea is to conserve resources and maximize output in sustainable ways. The fragmented land patches are integrated to complete the production model. The study site is planned according to field condition, such as erosion process, slope ratio, lighting, water resource and distance to settlements. Patches were identified using vegetation coverage and appropriate planting strategies were proposed accordingly.
In sum, the thesis is a critique of existing GGP. A new solution is proposed that can mitigate the conflict of soil erosion treatment and socio-economic development of local communities.published_or_final_version
Architecture
Master
Master of Landscape Architecture
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Norwood, James Christopher. "Life History and Case Building Behaviors of Phylloicus ornatus (Banks) (Trichoptera: Calamoceratidae) In Two Spring Fed Tributaries in the Central Edwards Plateau Bioregion of Texas." Thesis, University of North Texas, 2000. https://digital.library.unt.edu/ark:/67531/metadc2555/.
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The life history and case-making behaviors of Phylloicus ornatus from two springfed first order streams in the Edwards Plateau Bioregion of Texas were studied from January 1998 to November 1999. Field larval, pupal and adult samples and laboratory rearings indicated a multivoltine cycle. First instars differ from late instars in number of labral setae and in having a unique spur-like claw on each lateral hump. Larval development was asynchronous with second through fifth instars and pupae present most months. First instars were present April through July, October and November. Case making of first instar and case reconstruction of later instars extracted from their cases was documented by videophotography.
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Carr, Carla B. "Biogeography of Montane Mammals on the Colorado Plateau and Adjacent Regions." Thesis, University of North Texas, 2004. https://digital.library.unt.edu/ark:/67531/metadc4467/.
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This study identifies the biogeographic factors that structure small mammal communities on mountains of the Colorado Plateau and adjacent regions. Forty six isolated ranges were characterized across a 5-state study area encompassing the Colorado Plateau, including the central high plateaus of Utah and the Basin and Range Province (i.e. the Great Basin and mountains of Arizona and New Mexico). Presence/absence data of 25 montane mammal species were used to explore the interactions between historical and ecological processes affecting local and regional diversity patterns. Multivariate analyses, such as non-metric dimensional scaling, were used to explore factors which influence community composition. Results of these analyses revealed the Colorado River as a significant biogeographic barrier that affects montane mammal community structure. MtDNA cytochrome b sequence variation was analyzed among populations of the long-tailed vole, Microtus longicaudus, sampled from five interior ranges of the Colorado Plateau- Abajo, LaSal, Henry, and Chuska Mts., and Boulder Mountain of the Aquarius Plateau-and analyzed using traditional phylogenetic approaches (parsimony and likelihood) as well as nested clade analysis. Results support previous documentation of a major east-west phylogeographic break occurring between populations southeast of the Colorado River (eastern Arizona, Colorado, Wyoming and New Mexico) and all other western populations, which include a central clade, a northwest clade, and an Alaskan island clade. Evidence also supports differentiation of a 'southern Rockies' clade and a distinct 'southwest island' clade. Populations of M. longicaudus north and west of the Colorado River (Boulder and Henry Mts.) share two haplotypes, form a well-supported subclade with populations from the Kaibab plateau, and are closely related to the Northwest clade. Past approaches to studying montane mammal communities utilizing theory based on island biogeography have overemphasized area and isolation as the only forces structuring insular communities. As a result, there has been a lack of recognition of the influences of environmental factors, species turnover, and barriers that create and maintain regional diversity on the Colorado Plateau and adjacent areas.
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Chiacchio, Gotardo Olivia. "3D geological model of the San Leo plateau." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/19747/.
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The town of San Leo, situated in the Northern Apennines in Italy, is subject to instability phenomena due to its particular geological nature, described as a highly fractured calcarenite slab embedded in clay-rich terrains. The 3D geological model of the San Leo plateau, comprehending the eastern zone of the rock slab, was developed through the integration of data obtained from laser scanning and photogrammetrical surveys, as well as surface and core drilling geomechanical surveys, into one single system that enables the visualization of all structural features of the plateau in association with one another, including superficial and in-depth fractures and the equipment from the monitoring system that surveils the rock mass behavior. In that manner, it was established that the area along the northeastern scarp formed by the 2014 landslide event is highly fractured, characterized by an extremely high number of closed and few open fractures, whereas the area surrounding the road to the San Leo fortress along the eastern cliffs present fewer fractures in general, located predominantly in the vicinity of the eastern lateral walls. Moreover, two possible collapse scenarios were evaluated in the northeastern cliffs, in which the failure mechanism corresponding to the 2014 event was emulated for fractures parallel to the scarp, resulting in the collapse of a rock volume equivalent to 428,913.804m3. The persistence and behavior of the fractures involved in these scenarios were also analyzed, indicating that such events are not imminent at the present time.
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Held, Rhiannon Kathryn. "Textiles and ethnic groupings on the Columbia Plateau." Online access for everyone, 2006. http://www.dissertations.wsu.edu/Thesis/Fall2006/r_held_121106.pdf.
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Fraser, Douglas Dale. "Cholinergic-dependent plateau potential in hippocampal pyramidal neurons." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq20735.pdf.
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Maguire, K. L. "Type II-plateau supernovae : their characteristics and applications." Thesis, Queen's University Belfast, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.546386.
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Dunbar, Sarah (Sarah Ford). "Programmed emptiness : research infrastructure on the Tibetan plateau." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/45968.
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Thesis (M. Arch.)--Massachusetts Institute of Technology, Dept. of Architecture, 2008.Includes bibliographical references (p. 194-195).
The recent completion of a rail line running from central China to Lhasa in the Tibet Autonomous Region has brought attention not only to China's Architecture and Urbanism questionable occupation of Tibet, but also to the face that modernization in the TAR has adopted and the accompanying implications of China's large infrastructural projects in the TAR and other provinces. The thesis asserts that the form of development that has been propagated in Tibet has been modernizing in terms of economic growth and the incorporation of Tibet into networks of moving capital, people, and goods, but not actually modern, as Tibetans have generally been forced to the sidelines in the development of Tibet, serving more as indigenous tourist attractions than active participants in the shaping of a modern culture. The resulting condition is a present day state that is at once premodern and postmodern, consisting of a population that is still rooted in ancient traditions but very much a part of the society of the spectacle. This contradictory condition is heightened by Tibet's tourism industry, which caters to those visiting Tibet for its larger than life landscape features, unique and ubiquitous religion, and what is perceived as an authentic folk culture. The highly controlled route of the tourist in Tibet becomes, to some extent, a site where Tibet happens. Beyond the tourist route there are nomads, farmers, vast landscapes (and extreme poverty), but also a growing network of mines, power plants, military sites, dumps, prisons, and other peripheral ...
by Sarah Dunbar.
M.Arch.
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Li, Zhigang. "Structure, origine et évolution du plateau de Kerguelen." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13242.
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La structure et l'evolution du plateau kerguelen sont determinees a partir de donnees geophysiques. Une carte bathymetrique est etablie. Les donnees en sismique reflexion verticale ont permis d'identifier 4 unites sismostratigraphiques. Les profils gravimetriques ont ete utilisees pour modeliser la structure profonde du plateau, les profils magnetiques ont permis de dater la separation broken ridge et du plateau kerguelen. Cet ensemble correspond a une structure volcanique formee en limite de plaques au cretace inferieur, elle est egalement marquee par des episodes de rifting et de subsidence conduisant a la separation
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Li, Zhi Gang. "Structure, origine et évolution du plateau de Kerguelen." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37615294h.
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Weniger, Bernard. "La médecine populaire dans le plateau central d'Haïti." Metz : Université de Metz, 2009. ftp://ftp.scd.univ-metz.fr/pub/Theses/1985/Weniger.Bernard.SMZ8510.pdf.
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Sefton, Caryll. "Site and artefact patterns on the Woronora Plateau." Thesis, The University of Sydney, 1990. http://hdl.handle.net/2123/7222.
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McCord, Robert Dudridge 1955. "Late Cretaceous microherpetofaunas of the Kaiparowits Plateau, Utah." Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/282518.
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The microherpetofaunas recovered from the Kaiparowits Plateau, Utah, are described. Small reptiles and amphibians from 16 families and at least 22 genera were obtained from the Cenomanian Dakota, Turonian to Santonian Straight Cliffs, the early Campanian Wahweap, and the Campanian (Judithian) Kaiparowits Formations. A new genus and species of polyglyphanodontine, Manangyasaurus saueri, is described. The function of the unusual teeth of polyglyphanodontines is uncertain, but may have been related to frugivory. The polyglyphanodontines, in the restricted sense, appear to be confined to the western localities of the "southern communities" in the Judithian and Lancian. The early occurrence (Turonian) of Paraglyphanodon in the Straight Cliffs Formation suggests that the polyglyphanodontines may have been widespread during earlier Ages, permitting their dispersal to or from Asia. The genus Albanerpeton is best considered a member of the Order Caudata and its provisional assignment to the Family Prosirenidae is reasonable. The Polyglyphanodontidae, as presently defined, consists of a holophyletic group consisting of Polyglyphanodon, Paraglyphanodon, Manangyasaurus, and Cherminsaurus, and a poorly defined group consisting of the Asian "Macrocephalosauridae" Peneteius may also be a polyglyphanodontine, as the subfamily is presently defined.
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Radeff, Giuditta. "Geohistory of the Central Anatolian Plateau southern margin (southern Turkey)." Phd thesis, Universität Potsdam, 2014. http://opus.kobv.de/ubp/volltexte/2014/7186/.
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The Adana Basin of southern Turkey, situated at the SE margin of the Central Anatolian Plateau is ideally located to record Neogene topographic and tectonic changes in the easternmost Mediterranean realm. Using industry seismic reflection data we correlate 34 seismic profiles with corresponding exposed units in the Adana Basin. The time-depth conversion of the interpreted seismic profiles allows us to reconstruct the subsidence curve of the Adana Basin and to outline the occurrence of a major increase in both subsidence and sedimentation rates at 5.45 – 5.33 Ma, leading to the deposition of almost 1500 km3 of conglomerates and marls. Our provenance analysis of the conglomerates reveals that most of the sediment is derived from and north of the SE margin of the Central Anatolian Plateau. A comparison of these results with the composition of recent conglomerates and the present drainage basins indicates major changes between late Messinian and present-day source areas. We suggest that these changes in source areas result of uplift and ensuing erosion of the SE margin of the plateau. This hypothesis is supported by the comparison of the Adana Basin subsidence curve with the subsidence curve of the Mut Basin, a mainly Neogene basin located on top of the Central Anatolian Plateau southern margin, showing that the Adana Basin subsidence event is coeval with an uplift episode of the plateau southern margin. The collection of several fault measurements in the Adana region show different deformation styles for the NW and SE margins of the Adana Basin. The weakly seismic NW portion of the basin is characterized by extensional and transtensional structures cutting Neogene deposits, likely accomodating the differential uplift occurring between the basin and the SE margin of the plateau. We interpret the tectonic evolution of the southern flank of the Central Anatolian Plateau and the coeval subsidence and sedimentation in the Adana Basin to be related to deep lithospheric processes, particularly lithospheric delamination and slab break-off.Il Bacino di Adana (Turchia meridionale) é situato in posizione esterna rispetto al margine sud-orientale del plateau anatolico centrale. Il bacino risulta ubicato in posizione strategica per registrare i principali cambiamenti della topografia e dell’assetto tettonico avvenuti durante il Neogene nel Mediterraneo orientale. Utilizzando dati sismici provenienti dall’industria petrolifera abbiamo correlato 34 profili sismici con le unitá corrispondenti affioranti nel Bacino di Adana. La conversione da tempi a profonditá dei profili sismici interpretati ci ha permesso di ricostruire la curva di subsidenza del Bacino di Adana e di individuare un evento caratterizato da un importante aumento della subsidenza associato ad un considerevole incremento del tasso di sedimentazione. Questo evento, avvenuto tra 5.45 e 5.33 Ma ha portato alla deposizione di quasi 1500 km3 di conglomerati e marne. La nostra analisi di provenienza della porzione conglomeratica mostra che la maggior parte del sedimento proviene dal margine sud-orientale del plateau anatolico centrale e dalle aree situate a nord di questo. La comparazione di questi risultati con la composizione litologica di conglomerati recenti e con le litologie affioranti nei bacini di drenaggio attuali mostra cambiamenti rilevanti tra le aree di provenienza del sedimento Messiniane e quelle attuali. Riteniamo che questi cambiamenti nelle aree sorgente siano il risultato del sollevamento e della successiva erosione del margine sud-orientale del plateau anatolico centrale. Questa ipotesi é supportata dal confronto delle curve di subsidenza del Bacino di Adana e del Bacino di Mut, un bacino principalmente neogenico situato sulla sommitá del margine meridionale del plateau. La comparazione delle due curve di subsidenza mostra che l’evento di forte subsidenza del Bacino di Adana é coevo ad un episodio di sollevamento del margine meridionale del plateau anatolico centrale. La raccolta di un fitto dataset strutturale acquisito nella regione di Adana mostra differenti stili deformativi per i margini nord-occidentale e sud-orientale del bacino. La porzione nord-occidentale del bacino, debolmente sismica, é caratterizzata da strutture estensionali e transtensive che tagliano I depositi neogenici, verosimilmente accomodando il sollevamento differenziale tra il bacino e il margine sud-orientale del plateau. Riteniamo che l’evoluzione tettonica del margine meridionale del plateau anatolico centrale e la contemporanea subsidenza e sedimentazione nel Bacino di Adana sia da ricondurre a processi litosferici profondi, in particolar modo delaminazione litosferica e slab break-off.
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John, Cédric Michaël. "Miocene climate as recorded on slope carbonates examples from Malta (central mediterranean) and Northeastern Australia (Marion Plateau, ODP LEG 194) /." [S.l. : s.n.], 2003. http://pub.ub.uni-potsdam.de/2003/0023/john.pdf.
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Browning, Helen. "Producing constellations : opening new documentary to rhizome theory." Thesis, Queensland University of Technology, 2004. https://eprints.qut.edu.au/15944/1/Helen_Browning_Thesis.pdf.
Full textAbstract:
Uncertainty is a documentary film about belief systems that human animals use to navigate the unknown and assign meaning to experiences. It acknowledges that we exist amidst the parameters of our own perceptual constructs. Our frameworks for navigation often range in degrees of openness to the unknown and to outside scrutiny.
I set out to explore these concepts through interactions with different individuals and social groups, each with their unique templates. I hoped to produce a stimulating film that engaged diverse audiences through diverse content.
Structural and stylistic considerations are paramount to my theoretical and post-production reflections on Uncertainty. Deleuze and Guattari's (1988) theory of rhizomes provides a good reference in terms of the cross-fertilisation of ideas, decentralised structure and different states of connection that I hoped to provoke through the film.
New documentary theory highlights a trend towards greater interaction between filmmaker, audience and subject (Bruzzi, 2000). This signals a growing understanding that striving for objectivity in documentary is redundant. Although it is a welcome development, discussion could be broadened in relation to filmmaker presence and interactivity, to include style and structure as modes of primary interaction for the filmmaker with the audience and subject. This exegesis approaches expanding the parameters for interaction to examples, such as Uncertainty, where the filmmaker is neither present in image or voice.
Texts that offer constellations of ideas, like a rhizome, provide an alternative to those following a more linear progression or centralised argument. Promoting greater connectivity and multiplicity in documentary is congruous with the current developments in communications and technologies.
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Browning, Helen. "Producing Constellations : Opening New Documentary To Rhizome Theory." Queensland University of Technology, 2004. http://eprints.qut.edu.au/15944/.
Full textAbstract:
Uncertainty is a documentary film about belief systems that human animals use to navigate the unknown and assign meaning to experiences. It acknowledges that we exist amidst the parameters of our own perceptual constructs. Our frameworks for navigation often range in degrees of openness to the unknown and to outside scrutiny. I set out to explore these concepts through interactions with different individuals and social groups, each with their unique templates. I hoped to produce a stimulating film that engaged diverse audiences through diverse content. Structural and stylistic considerations are paramount to my theoretical and post-production reflections on Uncertainty. Deleuze and Guattari's (1988) theory of rhizomes provides a good reference in terms of the cross-fertilisation of ideas, decentralised structure and different states of connection that I hoped to provoke through the film. New documentary theory highlights a trend towards greater interaction between filmmaker, audience and subject (Bruzzi, 2000). This signals a growing understanding that striving for objectivity in documentary is redundant. Although it is a welcome development, discussion could be broadened in relation to filmmaker presence and interactivity, to include style and structure as modes of primary interaction for the filmmaker with the audience and subject. This exegesis approaches expanding the parameters for interaction to examples, such as Uncertainty, where the filmmaker is neither present in image or voice. Texts that offer constellations of ideas, like a rhizome, provide an alternative to those following a more linear progression or centralised argument. Promoting greater connectivity and multiplicity in documentary is congruous with the current developments in communications and technologies.
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Elger, Kirsten [Verfasser]. "Analysis of deformation and tectonic history of the Southern Altiplano Plateau (Bolivia) and their importance for plateau formation / Geoforschungszentrum Potsdam. Kirsten Elger." Potsdam : Geoforschungszentrum, 2004. http://d-nb.info/971235333/34.
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Doura, Fred. "Hai͏̈ti-plateau central : dépendance et sous-développement, : ou la paysannerie dans l'économie rurale du plateau central d'Hai͏̈ti : une étude d'une économie dépendante." Paris 8, 1993. http://www.theses.fr/1993PA080789.
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Cette these sur l'economie rurale du plateau central couvre la periode historique allant de l'occupation americaine d'haiti de 1915 a 1934 jusqu'a nos jours. De cette periode remonte en grande partie son sous-developpement, sa desarticulation et sa dependance actuelle. Nous avons montre que la structure economique du plateau central presente toutes les caracteristiques d'une economie precapitaliste dominee et assujettie a l'economie de "la republique de port-au-prince" dependante du centre capitaliste. Les consequences de cette economie desarticulee sont: le non developpement des forces productives, des systemes d'education et de sante inadequats, l'analphabetisme, la malnutrition a l'etat endemique, l'absence d'infrastructure administrative et de transport dans la region. Nous avons d'autre part demontre que la paysannerie a toujours, a travers l'histoire d'haiti principalement celle du plateau central, par sa resistance armee et ou socio-economique, fait face a la spoliation et a l'exploitation. L'enjeu de cette resistance ou de cette strategie de survie a toujours ete la lutte pour la possession du principal moyen de production : la terre et l'elimination des principaux mecanismes d'extorision du surproduit. Finalement, nous avons etabli que cette resistance caracterise l'essentiel de la lutte des classes qui a oppose la paysannerie tant au niveau national qu'a celui du plateau central, aux oligarchies dominantes de la formation sociale haitienneThis thesis on rural economy of central plateau covers the historic period begining with the american occupation in haiti precicely from 1915 to 1934 up to nowadays. It's from that period of time that the major part of its underdevelopment, its dislocation and its actual dependance originates. We have demonstrated that the economy structure of the central plateau shows all the caracteristics of a pre-capitalis economy dominated and subjugated to the economy of the "republic of port-au-prince" dependant of the capitalist's center. The consequences of this desarticulation are : the non-development of the productive forces, the inadequate education and healt systems, illeteracy, the malnutrition to the endemic state, the absence of transport and administrative infrastructure in the region. We have also demonstrated, through haiti's history espacially central plateau, that the peasantry by its armed and or socioeconomic resistance, has always faced despoilment and exploitation. The stoke in this resistance or in this survival stategy has always been the strugle for the possession of the principal mean of production : the land and the elimination of the main mecanisms of the surproduct extorsion. We have also established that the resistance caracterizes the essential in the class strugle that has opposed peasantry on the national as well as on the central plateau's level, to the dominating oligarchy of haitian's social formation
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Laurens, Lucette. "Utiliser l'Aubrac, comment?" Lille 3 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37607068p.
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Heyman, Jakob. "Glacial geology of Bayan Har Shan, northeastern Tibetan Plateau." Licentiate thesis, Stockholm University, Department of Physical Geography and Quaternary Geology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-7507.
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The paleoglaciology of the Tibetan Plateau is still largely unexplored, despite its importance for regional and global climate reconstructions. In this thesis a comprehensive glacial geological record is presented from an extensive part of the northeastern Tibetan Plateau centred on the Bayan Har Shan. Glacial reconstructions for this region range from restricted mountain glaciers through the intermediate-size regional-scale Huang He ice sheet to a plateau-scale Tibetan ice sheet. To provide a robust basis for glacial reconstructions, this thesis provides conclusions based on two principle methods, remote sensing and field studies. The remote sensing of a 90 m resolution digital elevation model and 15- and 30 m resolution satellite imagery renders a detailed data set with complete spatial coverage of large- and medium-scale glacial landforms, and large-scale plateau geomorphology. Observations from fieldwork campaigns add detailed point information for the distribution of glacial deposits. Geomorphological glacial traces such as glacial valleys, glacial lineations, marginal moraines, meltwater channels, and hummocky terrain occur frequently in elevated mountain areas, indicating former alpine-style glaciations. Glacial deposits in the form of till, erratic boulders, and glaciofluvial sediments are common in areas with mapped glacial landforms, but also beyond, in areas lacking large-scale glacial landforms. For extensive plateau areas in-between formerly glaciated mountain blocks, there is a striking absence of glacial landforms and sediments, indicating that these areas, perhaps, never were ice covered. Interestingly, glacial deposits occur further away from the mountain blocks than the large- and medium-scale glacial landforms, indicating insignificant erosion beneath the maximum ice covers close to their margins.
The large-scale geomorphology of the northeastern Tibetan Plateau is characterised by a low-relief plateau surface with glacial valleys in elevated mountain blocks and marginal steep V-shaped valleys. This geographical distribution indicates a dominance of glacial erosion in the elevated mountain areas and a dominance of fluvial erosion along the steep plateau margins, dissecting a relict plateau surface. The outline of the relict plateau surface mimics the proposed outline of the Huang He ice sheet, suggesting that the inferred ice sheet may represent a misinterpreted relict surface with scattered glacial traces.
In conclusion, the glacial geology examined in the Bayan Har Shan region is consistent with paleo-glaciers of varying extent restricted to elevated mountain areas. Even though extensive icefields/ice caps were centred on discrete mountain areas, there is no indication that these ice masses merged but rather that they were separated from each other by unglaciated plateau areas. The presented glacial geological record will be used in further studies towards a robust paleoglaciological reconstruction for the northeastern Tibetan Plateau.