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Dissertations / Theses on the topic 'Magmatic sources'

Author: Grafiati

Published: 11 December 2022

Last updated: 31 July 2025

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1

Mizzon, Hugau. "The magmatic crust of Vesta." Thesis, Toulouse 3, 2015. http://www.theses.fr/2015TOU30124/document.

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Les astéroïdes Cérès et Vesta ont motivé la mission spatiale Dawn parce qu'ils représentent deux embryons planétaires différents restés relativement intacts depuis leur formation. Vesta est large- ment considéré comme le corps parent des météorites HED témoins d'une activité magmatique probablement due à la présence de l'isotope radioactif 26Al qui était suffisamment abondant pour permettre la fusion interne des corps rocheux primitifs. La composition d'une surface planétaire peut être mesurée grâce à l'analyse des rayons gammas qu'elle produit. Pour la sonde Dawn cela est rendu possible par l

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2

Salters, Vincent J. M. "The use of Hf-isotopes and high field strength elements to constrain magmatic processes and magma sources." Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/58018.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1989.<br>Includes bibliographical references.<br>by Vincentius Johannes Maria Salters.<br>Ph.D.

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3

Achin, Isabelle. "Caractérisation des sources d'uranium à l'Archéen : mécanismes de genèse des gisements d'uranium les plus anciens (3,0 à 2,2 Ga) et des préconcentrations uranifères paléoprotérozoïques." Thesis, Nancy 1, 2010. http://www.theses.fr/2010NAN10045/document.

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Les plus anciens gisements d’uranium connus sur Terre sont les gisements de type paléo-placer hôtes de conglomérats à cailloux de quartz d’âge compris entre 3,09 et 2,2 Ga. Ces gisements représentent les reliques de l’ancienne croûte continentale archéenne maintenant érodée. L’origine de leurs concentrations primaires, correspondant à des accumulations de grains détritiques d’uraninite, est toujours sujette à controverse et la nature et les processus de formation des roches sources archéennes demeurent incertains.Ce travail présente l’analyse minéralogique et géochimique détaillée des minérali

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4

Beaumais, Aurélien. "Géochimie de l'arc du Vanuatu : évolution spatio-temporelle des édifices volcaniques et des sources mantelliques." Phd thesis, Université de Bretagne occidentale - Brest, 2013. http://tel.archives-ouvertes.fr/tel-00919413.

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L'archipel volcanique actif du Vanuatu s'édifie au coeur du pacifique sud-ouest au niveau de la frontière convergente des plaques australienne et pacifique. Je présente ici une nouvelle étude géochimique des laves du Vanuatu à partir de la détermination des compositions en éléments majeurs et traces, et des compositions isotopiques (Sr-Nd-Hf-Pb) d'une centaine d'échantillons de laves (< 2 Ma).L'étude des magmas les plus primitifs a permis de mettre en évidence la variation de composition des sources mantelliques le long de l'arc et d'individualiser 3 segments : "central", dans la zone de colli

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5

Romanova, Irina. "Volcanology and geochemistry of the Cretaceous volcaniclastic deposits and basalts from Ori Massif, Shatsky Rise Oceanic Plateau." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/108162/1/Irina_Romanova_Thesis.pdf.

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This study enhanced our understanding of the origin and evolution of Ori Massif, Shatsky Rise Oceanic Plateau. Key findings are: 1. Volcaniclastic deposits were formed by Surtseyan style phreatomagmatic activity, suggesting that the summit of Ori Massif was shallow-marine to near sea-level; 2. Basaltic fragments from the volcaniclastic deposits provide further evidence for geochemical variation of magmas from Ori Massif and indicate a significant involvement of depleted mantle in its source; 3. Element mobility during seawater alteration of basalts from Ori and Tamu Massifs depends on stratigr

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6

Hogan, John Patrick. "Mineralogical, chemical and isotopic diversity in plutonic rock suites from the Coastal Maine Magmatic Province:the role of source region heterogeneity, tectonic setting and magmatic processes." Diss., Virginia Tech, 1990. http://hdl.handle.net/10919/39074.

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This dissertation represents an investigation of the mid-Paleozoic tectono-thermal and kinematic evolution of the crust in eastern coastal Maine as recorded by the plutonic rocks of this region. The first chapter describes the plutonic rocks of the Coastal Maine Magmatic Province. A tectonic model is developed in which late Ordovician-Silurian bimodal magmatism is interpreted to reflect crustal melting as a result of intraplating of mantle melts at high crustal levels during a period of tension. Large scale melting of lower crustal source regions, represented by voluminous intrusion of Devoni

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7

Hogan, John Patrick. "Mineralogical, chemical and isotopic diversity in plutonic rock suites from the Coastal Maine Magmatic Province : the role of source region heterogeneity, tectonic setting and magmatic processes /." This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-08082007-114045/.

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8

Petford, Nicholas. "The relation between deformation, granite source type and crustal growth : Peru." Thesis, University of Liverpool, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316605.

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9

Harper, Caprise Steadman. "A LA-ICPMS Sr Isotope and Trace Element Study of Plagioclase and Clinopyroxene of the Higganum Dike, Connecticut: Determining the Magma Source of the Central Atlantic Magmatic Province." BYU ScholarsArchive, 2009. https://scholarsarchive.byu.edu/etd/2289.

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The Higganum dike of Connecticut is one of the earliest basaltic dikes of the Central Atlantic Magmatic province and is geochemically representative of the widespread low-Ti basaltic lavas (~1 wt % TiO2) that make up the majority of the province in North America. Liquid compositions calculated from Cr-rich clinopyroxene cores from the Higganum dike are significantly more primitive than the bulk rock with average Mg# s of 0.63 compared to the Higganum dike which has Mg #'s ~ 0.55. However, the negative Nb and positive Pb anomalies that are seen in trace element patterns of the low-Ti group are

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10

Hayes, Sarah Louise. "Subduction of Elements with Variable Oxidation State: Effects on the Source of Arc Magmatism." Thesis, Curtin University, 2017. http://hdl.handle.net/20.500.11937/68271.

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Subduction of sediments has had little influence on bulk rock, mineralogical and redox compositions. Fluid infiltration is the most significant driver in mass transfer and mineralogical changes are localised to lithological contacts and shear zones. The sediments are likely to have little influence on the redox state of the sub-arc mantle. The lack of decarbonation suggests that CO2 could potentially be sequestered in the deep mantle on the timescale of millions to billions of years.

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11

King, John Frederick. "Magmatic Evolution and Eruptive History of the Granitic Bumping Lake Pluton, Washington: Source of the Bumping River and Cash Prairie Tuffs." PDXScholar, 1994. https://pdxscholar.library.pdx.edu/open_access_etds/4765.

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The 25 Ma Bumping Lake pluton ranges in composition from quartz diorite to granite with the granitic facies comprising approximately 90% of the pluton's surface area. The granite may be classified as calcalkaline, peraluminous and I-type with some Stype characteristics. A late-stage, mafic-poor facies fills cooling related extensional fractures. The pluton was passively emplaced into the Ohanapecosh Formation at a shallow level in the crust. Contact relationships vary from sharp where the contact is vertical to gradational at the roof of the pluton. Where gradational, stoped xenoliths from the

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12

Georgiev, Svetoslav. "Sources and evolution of Late Cretaceous magmatism in Eastern Srednogorie, Bulgaria : constraints from petrology, isotope geochemistry and geochronology /." Zürich : ETH / Department of Earth Sciences Fluids and Mineral Deposits Group, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17778.

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13

Heath, Ben. "New Constraints on the Magmatic System beneath Newberry Volcano from the Analysis of Active and Passive Source Seismic Data and Ambient Noise." Thesis, University of Oregon, 2015. http://hdl.handle.net/1794/18744.

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Using joint P-wave seismic tomography, receiver functions, and ambient noise we image the magmatic structure beneath Newberry Volcano, located near Bend, Oregon. Use of active source and teleseismic events in a joint tomographic inversion provides the ray crossings necessary to resolve a low velocity body around 4 km depth. Receiver functions show large lateral heterogeneity and are consistent with the location of a low velocity body derived from the tomography but require a larger low velocity anomaly. Ambient noise autocorrelations are used to image a low velocity reflector, located at ~3 km

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14

VanderBeek, Brandon. "New Perspectives on Mid-Ocean Ridge Magmatic Systems and Deformation in the Uppermost Oceanic Mantle from Active- and Passive-Source Seismic Imaging in Cascadia." Thesis, University of Oregon, 2019. http://hdl.handle.net/1794/24205.

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In this dissertation, I use seismic imaging methods to constrain the evolution of the oceanic upper mantle across the Juan de Fuca (JdF) and Gorda plates. This work begins by studying the geometry of the mantle magmatic system and patterns of mantle flow beneath the northern JdF ridge in relation to ridge-parallel changes in accretionary processes. I find that the dynamics of lithospheric rifting exert the primary control on the distribution of shallow mantle melts and variations in crustal thickness and composition. The orientation of mantle divergence beneath the JdF ridge, as inferred from

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15

Parisio, Laura. "VOLCANISM AND INTRUSIONS OF THE DECCAN TRAPS, INDIA: GEOCHEMISTRY AND GEOCHRONOLOGY OF THE MAGMATIC ROCKS AND PALEOENVIRONMENTAL CONSEQUENCES." Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3423742.

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The Deccan Traps are one of the most important Large Igneous Provinces (LIP) in the world, they are mainly constituted by tholeiitic lava flows, now covering almost one sixth of the Indian continent, and reaching the maximum exposed thickness of 1300 m. The emplacement of such quantities of magma and its timing (ca. 66Ma) close to the Cretaceous-Paleogene (K-Pg) boundary, have led several authors to propose a causal link between the formation of the province and the K-Pg boundary mass extinction . Moreover, a distinctive feature of the province is the presence, beside the tholeiites, of severa

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16

Iovine, Raffaella Silvia [Verfasser], Gerhard [Akademischer Betreuer] Wörner, Gerhard [Gutachter] Wörner, Andreas [Gutachter] Pack, and Massimo [Gutachter] D’Antonio. "Source and magmatic evolution of the Neapolitan volcanoes through time (Southern Italy) / Raffaella Silvia Iovine ; Gutachter: Gerhard Wörner, Andreas Pack, Massimo D’Antonio ; Betreuer: Gerhard Wörner." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2019. http://d-nb.info/1186591307/34.

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17

PELLERITO, Andrea. "Redox estimates through trace elements partitioning: application on two Italian volcanoes, model comparison and overview on different geodynamic environments." Doctoral thesis, Università degli Studi di Palermo, 2021. http://hdl.handle.net/10447/498435.

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Oxygen fugacity of Earth’s mantle is one of the most debated issues of petrology. While is evident that the arc-related magmas are more oxidized than MORB and intraplate magmas, however, is not yet possible to produce a model that can uniquely determine this thermodynamic parameter for the depth of the Earth. Furthermore, there is not a clear cause that create this difference of redox conditions between volcanic products. Recently, several experimental models based on the V partitioning between olivine and mafic melt were published and proposed as tools for investigating the redox state

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18

Pflumio, Catherine. "Histoire volcanique et hydrothermale du massif de salahi : implications sur l'origine et l'evolution de l'ophiolite de semail (oman)." Paris, ENMP, 1988. http://www.theses.fr/1988ENMP0112.

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L'etude petrographique et geochimique de l'ophiolite de semail (massif salahi, oman) qui represente le plus vaste affleurement de lithosphere oceanique fossile permet de distinguer 3 phases de volcanisme, presentant des rapports ta/th anormaux qui sont interpretes comme les temoins d'une anomalie mantellaire regionale. Un modele d'evolution en contexte oceanique franc est propose. L'etude des differents episodes de circulation hydrothermale est egalement abordee

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19

Hansen, James W. L. "The petrology, geochemistry and petrogenesis of the Goomboorian intrusive complex, southeast Queensland." Thesis, Queensland University of Technology, 1997.

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20

ALMEIDA, CAROLINA. "MINERAL PARAGENESIS, GEOCHEMISTRY AND GEOCHRONOLOGY INVESTIGATIONS OF THE CARLIN-TYPE GOLD DEPOSITS AT THE GOLDSTRIKE PROPERTY, NORTHERN NEVADA: IMPLICATIONS FOR ORE GENESIS, IGNEOUS PETROGENESIS AND MINERAL EXPLORATION." Thesis, 2009. http://hdl.handle.net/1974/5231.

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The Goldstrike property is located in northern Nevada and contains one of the largest and highest-grade Carlin-type gold deposits. The majority of the Eocene Au mineralization (e.g., Ore I) is hosted in intensely altered Paleozoic lower-plate impure carbonate rocks, and is characterized by strong to moderate silicification, higher calculated pyrite and ore-related element concentrations (e.g., As, Cu, Hg, Ni, Tl, Sb, W, and Zn) than Ore II, which is weakly altered. However, both ore types contain similar Au concentration in whole rock and pyrite chemistry analyses. Lithogeochemical and micropr

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21

Iovine, Raffaella Silvia. "Source and magmatic evolution of the Neapolitan volcanoes through time (Southern Italy)." Doctoral thesis, 2018. http://hdl.handle.net/11858/00-1735-0000-002E-E634-E.

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22

Hung, Yu-chiao, and 洪于喬. "Chemical compositions and Sr-Nd-Hf isotopes of Lutao volcanic rocks: significances on magmatic processes and source characteristics." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/73428800862637361175.

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碩士<br>國立成功大學<br>地球科學系碩博士班<br>97<br>The chemical components involved in the mantle source of the North Luzon lavas have been an issue of debate. In existing mixing models, the depleted end-member was assigned to MORB source, while EMI, subducting sediments, and metasomatic fluids and melts were considered as enriched components. These models were all developed from chemical and isotope compositions of lavas from entire North Luzon arc without a detailed investigation on chemical variations of lavas in individual islands. In this study, the chemical compositions and Sr, Nd, and Hf isotope ratios

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23

Stoltze, Amanda M. "Is proximal carbonatite magmatism the source of gold at the Wallaby Deposit, Western Australia?" Phd thesis, 2006. http://hdl.handle.net/1885/150079.

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24

GRANATI, SERENA FRANCESCA. "The architecture of the magmatic feeding system of the Campi Flegrei Volcanic District: constraints from experimental petrology." Doctoral thesis, 2016. http://hdl.handle.net/11573/896203.

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This work is aimed to provide an experimental contribution to a better definition of the evolutionary processes of Phlaegrean Volcanic District (PVD). To reach this goal high pressure experiments were performed on a natural sample of mafic composition (K-basalt), at variable T, P, ƒO2 and XH2O conditions. Pressures of 800, 400 and 200 MPa have been chosen to simulate the magmatic differentiation in the PVD system, supposed to be a multilevel one. A temperature range of about 120°C starting from the liquidus temperature has been set up for the experimental runs. Water effect was evaluated by t

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25

"Mechanical Modeling of Natural and Anthropogenic Fluid-Rock Interactions: Volcano Deformation and Induced Seismicity." Doctoral diss., 2018. http://hdl.handle.net/2286/R.I.51147.

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abstract: The dynamic Earth involves feedbacks between the solid crust and both natural and anthropogenic fluid flows. Fluid-rock interactions drive many Earth phenomena, including volcanic unrest, seismic activities, and hydrological responses. Mitigating the hazards associated with these activities requires fundamental understanding of the underlying physical processes. Therefore, geophysical monitoring in combination with modeling provides valuable tools, suitable for hazard mitigation and risk management efforts. Magmatic activities and induced seismicity linked to fluid injection are two

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26

Brand, Natalie Bronwyn. "Isotopic fingerprinting (Sr-Nd-Hf-Os-C-O) of mantle source regions to kimberlite magmatism beneath the eastern Superior Craton, Canada." Thesis, 2016. http://hdl.handle.net/10539/21010.

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A dissertation submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of requirements for the degree of Master of Science. Johannesburg, 2016.<br>The northern sector of the Archaean Superior Craton has been a significant region for diamond exploration, hosting numerous alkaline intrusions of Proterozoic age. The focus of this study is on two kimberlite fields that are situated in eastern Canada, 400 km apart. These are the diamond-rich Renard pipes and dykes, and the Wemindji field, consisting of barren sheeted dykes. The nine diamondiferous Renard ig

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27

Robinson, Frank Alexander. "Geochronological and geochemical constraints on the lithospheric evolution of the Arabian shield, Saudi Arabia: understanding plutonic rock petrogenesis in an accretionary orogen." Thesis, 2014. http://hdl.handle.net/2440/84674.

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The Arabian-Nubian shield reflects the complex interplay between juvenile oceanic and continental arc fragments accreted during the final stages of Gondwanian super continental assembly. To date, much of the geochronological and geochemical data from the Arabian Shield, Saudi Arabia, is absent or poorly constrained and extrapolated from neighbouring Middle Eastern and African countries. Little attention has been paid to the petrogenesis and tectonic significance of the plutonic rocks pursuant to lithospheric orogenesis. A total of 137 samples from 26 geological units were collected from the Mi

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