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Thèses sur le sujet « Ultramafic rock »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 31 juillet 2025

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1

SCARSI, MARCO. "Faulting, fluid-rock interaction and hydrothermal mineralisation in ultramafic rocks (Voltri Massif, Ligurian Alps)." Doctoral thesis, Università degli studi di Genova, 2018. http://hdl.handle.net/11567/929962.

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This study deals with reverse faults within intensely carbonated metalherzolites, with related gold mineralisations, from the Voltri Massif, and in particular within the Lavagnina Lakes area, in the Gorzente Valley. This area is located in northwest Italy among the municipalities of Casaleggio Boiro, Lerma, Mornese, and Bosio (Alessandria, Italy; GPS coordinates WGS84, 44.600685° N, 8.784286° E). The Voltri Massif is a metaophiolitic complex, which occurs within the Eastern edges of the Ligurian Alps. It is made up of of metaophiolitic rocks associated with metasediments and slices of

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2

Scoon, Roger N. "Discordant bodies of postcumulis, ultramafic rock in the upper critical zone of the Bushveld complex : iron-rich ultramafic pegmatite bodies at Amandelbult and the Driekop platiniferous ultramafic pipe." Thesis, Rhodes University, 1986. http://hdl.handle.net/10962/d1004912.

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From the abstract: In the layered sequence of the Bushveld Complex a number of distinct, but possibly genetically related groups of transgressive, postcumulus, ultramafic and mafic rock are recognised. The main part of this thesis investigates a suite of postcumulus rocks for which the name iron-rich ultramafic pegmatite is proposed. The majority of iron-rich ultramafic pegmatite bodies examined are from the upper critical zone of the layered sequence at Rustenburg Platinum Mines Amandelbult Section, in the northern sector of the western Bushveld Complex. Field relationships imply that the iro

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3

Berly, Thomas. "Ultramafic and mafic rock types from Choiseul, Santa Isabel and santa Jorge (Northeastern Solomon Islands) : origins and significance." Grenoble 1, 2005. http://www.theses.fr/2005GRE10223.

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Les Iles Salomon forment une double chaîne d'îles située au nord-est de l'Australie entre la Papousie Nouvelle Guinée et les Iles Vanuatu (Océan Pacifique), résultant de la récente collision (<10 Ma) du plus grand plateau océanique au monde - Ontong Java (OJP) avec l'arc volcanique des Iles Salomon, issu de la subduction de la plaque Pacifique sous la plaque indo-australienne (depuis 43 Ma). Résultant de cette collision, des écailles de roches ultramafiques (péridotites et pyroxénites) et mafiques (basaltes et gabbros) ont été obductées et affleurent au nord-est des Iles Salomon. L'objectif

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4

Clark, David 1979. "Petrogenetic and economic significance of the whole-rock chemistry of ultramafic cumulates in the Cape Smith foldbelt, northern Quebec." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=112390.

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The ultramafic cumulate rocks of the Raglan horizon in the Proterozoic Cape Smith fold belt of northern Quebec have a common parental liquid in equilibrium with olivine of Fo89 composition. Cumulate olivines have experienced a trapped liquid shift to lower forsterite composition proportionally to the fraction of trapped liquid in the cumulate. Anomalously low nickel contents in analyses of both olivine and whole-rock chemistries are observed only in cumulates with the most modal olivine and which are proximal to known Ni-Cu-(PGE) deposits. The calculated compositions of the trapped liquid frac

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5

Sterritt, Victoria Athena. "Understanding physical property : mineralogy relationships in the context of geologic processes in the ultramafic rock-hosted mineral deposit environment : aiding interpretation of geophysical data." Thesis, University of British Columbia, 2006. http://hdl.handle.net/2429/32686.

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Inversion of potential field geophysical data to generate physical property models is becoming increasingly common in the exploration industry. This study aimed to develop relationships between physical properties and mineralogy in ultramafic rock-hosted mineral deposits, based on an analysis of the crater facies-dominated Anuri kimberlite (Canada) and the intrusive magmatic sulfide deposit at Kabanga (Tanzania). Physical property distributions for rock types and minerals that contribute to density and magnetic susceptibility were characterized in both deposits. Magnetic susceptibility

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6

Souza, Thamy Lara. "Controles mineralógicos e geoquímicos do níquel não sulfetado em rochas ultramáficas no Escudo Sul-Riograndense." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2014. http://hdl.handle.net/10183/94678.

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Este trabalho tem como objetivo investigar os processos controladores da mobilidade e concentração de níquel (Ni) em rochas ultramáficas serpentinizadas no Escudo Sul-Riograndense (ESrg), Rio Grande do Sul (RS), Brasil. A composição primária das rochas ultramáficas hospedeiras de Ni constitui um parâmetro relevante, mas os processos secundários são os controladores mais importantes dessas mineralizações, principalmente a serpentinização, pressupondo-se que o Ni possa migrar da olivina ou metamórfica para os minerais do grupo das serpentinas. Para a caracterização mineralógica e textural das ro

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7

GUERINI, SARA SIBIL GIUSEPPINA. "STRUCTURE, GEOCHEMISTRY AND PETROLOGY OF SERPENTINITES AND LISTVENITES IN THE WESTERN ALPS: CONSTRAINTS ON CARBONATION AND ELEMENT MOBILIZATION FROM SUBDUCTION TO OPHIOLITE EMPLACEMENT." Doctoral thesis, Università degli Studi di Milano, 2022. http://hdl.handle.net/2434/927547.

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This Ph.D. Thesis is intended as a multidisciplinary research work on the Zermatt-Saas (Western Alps) serpentinites and associated carbonated rocks. The main goal of this thesis is to decipher the carbonation processes involving serpentinites and the concomitant element mobilization, while also attempting at defining the serpentinites’ subduction-to emplacement- evolution. To address these aims, field work activities, spanning from acquisition of macro-structural data to sampling of representative lithologies, and detailed petrography were carried out on a sequence of serpentinites, carbonat

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8

de, Oliveira Elson Paiva. "Petrogenesis of mafic-ultramafic rocks from the Precambrian Curaca terrane, Brazil." Thesis, University of Leicester, 1990. http://hdl.handle.net/2381/35079.

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The Caraiba copper-rich hypersthenite-norite complex in the Early Proterozoic Curaca terrane of northern Bahia, Brazil, is not a tholeiitic layered sill as has been previously suggested. It is re-interpreted as a series of multiple dyke-like intrusions, possibly derived through partial melting of an incompatible element enriched harzburgitic to orthopyroxenitic lithospheric mantle source region. It contains peridotitic and gabbroic xenoliths. Copper-rich gabbroic xenoliths may represent volcanic rocks taken to upper mantle depths by a process of subduction. The chemistry of some of the regiona

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9

Kieser, Nigel Bernard John. "Platinum-group element dispersion associated with mafic and ultramafic rocks in Alaska." Thesis, Imperial College London, 1996. http://hdl.handle.net/10044/1/8235.

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10

Power, Matthew R. "Models for the genesis of industrial minerals in mafic and ultramafic rocks." Thesis, University of Exeter, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245925.

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11

Craven, John Anthony. "The petrogenesis of some ultramafic rocks from the Gardar Province, S.W. Greenland." Thesis, University of Edinburgh, 1985. http://hdl.handle.net/1842/12171.

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12

Ford, Frederick Dean Carleton University Dissertation Geology. "Petrology of the Flinton Creek ultramafic rocks, central metasedimentary belt, Grenville province." Ottawa, 1989.

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13

Nagy, Laszlo. "Ecological investigations on selected species at the Meikle Kilrannoch Ultramafic Outcrops, Scotland." Thesis, University of Stirling, 1994. http://hdl.handle.net/1893/11843.

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Ecological and ecophysiological investigations carried out at the ultramafic outcrop near Meikle Kilrannoch, Angus, Scotland are reported. The outcrop is botanically famous for its rare plant species, particularly the endemic Cerastium fontanum ssp. scoticum and the nationally rare Lychnis alnina. The studies were made on the main outcrop (called MK1) which is dome shaped, and on a much smaller low-lying area (called MK1.5) about 300 m from it. The overall aim of the studies was to investigate the relationship between the soil physico-chemical environment and species distribution on the open a

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14

Stern, Fabio G. "Geochemistry of the Ultramafic Rocks from the Bay of Island Ophiolitic Complex, Newfoundland." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24159.

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The Bay of Islands Ophiolitic Complex (BOIC) is one of most well preserved and well-exposed ophiolites in the world. The BOIC consist of four massifs; these are the Table Mountain (TBL), North Arm Mountain (NAM), Blow-Me-Down Mountain (BMD) and Lewis Hills massifs. Proposed geological environments of the BOIC in Newfoundland are diverse; ranging from oceanic spreading ridge to supra-subduction setting. The BOIC has a complete ophiolite sequence as defined at the Penrose Conference (Anonymous, 1972) including ultramafic mantle rocks, ultramafic to gabbroic cumulate rocks, sheeted dikes, pill

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15

Berry, Neil Howard. "The significance of mafic and ultramafic rocks in the crustal development of northern Greece." Thesis, University of Leicester, 1997. http://hdl.handle.net/2381/30450.

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That there are a number of distinct ophiolitic belts separating some of the major tectonic zones of Greece and the eastern Mediterranean is generally well known. These have previously been interpreted as the remnants of back-arc basins, Mesozoic rifts, and supra-subduction zone type ophiolites. However mafic and ultramafic rocks present in the region of the Serbo-Macedonian Massif, northern Greece, do not appear to fit this model, and have generally been neglected in tectonic interpretations. The aim of this study is to determine how these bodies arrived at their current position, what is thei

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16

Koksal(toksoy), Fatma. "Petrology Of The Phlogopite-bearing Ultramafic-mafic Plutonic Rocks Within Central Anatolian Crystalline Complex, Turkey." Phd thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/4/655178/index.pdf.

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The aim of this study is to define mineralogical and geochemical characteristics of phlogopite-pargasite enriched ultramafic-mafic cumulate rocks from Kuran&ccedil<br>ali (Kirsehir) and their implications for petrology and regional geological setting. The Kuran&ccedil<br>ali rocks, found within an allochthonous sliver, are representative for the isolated members of the Central Anatolian Ophiolites, derived from closure of Izmir-Ankara-Erzincan branch of Alpine Neotethys. The rocks overthrust the Metamorphic Ophiolitic M&eacute<br>lange (the uppermost part of the Central Anatolian Metamorphics)

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17

Phillips, David. "Mineralogy and petrology of the Townlands iron-rich ultramafic pegmatite." Thesis, Rhodes University, 1985. http://hdl.handle.net/10962/d1007617.

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The Townlands iron-rich ultramafic pegmatite is a relatively large pipelike body situated in the western corner of Rustenburg Section, Rustenburg Platinum Mines. It is characterised by a strong negative magnetic signature and transgresses the noritic layered sequence of the upper critical zone of the Bushveld Complex. The layered rocks are downwarped in the vicinity of the pipe and are in sharp contact with the pegmatitic material. The pegmatite varies in composition between dunite and wehrlite, with the marginal zones being more wehrlitic in composition. Olivine (Fo₃₀ - Fo₅₂) and clinopyroxen

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18

Burnham, Oliver Marcus. "The geochemistry of Re and Os in ultramafic rocks from the Pyrenees and Massif Central, France." Thesis, Open University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283166.

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19

Kawase, Daiju. "Phylogenetic differentiation and population genetic structure of plants distributed in specific soils derived from ultramafic rocks." 京都大学 (Kyoto University), 2008. http://hdl.handle.net/2433/136935.

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20

Hussey, Michael Charles. "Surface detection of alkaline ultramafic rocks in semi-arid and arid terrains using spectral geological techniques." Thesis, Open University, 1998. http://oro.open.ac.uk/54178/.

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Studies have been completed into the spectral response of alkaline and other ultramafic rocks from arid and semi-arid regions. To date these rocks have not been investigated spectrally in a systematic fashion using the latest field and airborne imaging spectrometers. The objective was to determine how spectral geological techniques could be used to locate these rock types when they are exposed, weathered and reduced to residual soil. The data used in this study were spectra obtained from field spectrometers (PIMA and GER IRIS MkIV) and airborne scanners (GEOSCAN MkII, GER IS and HyMap). These

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21

Delgado-Argote, Luis Alberto 1953. "Geologic and economic study of ultramafic complexes of the coast of Guerrero, Mexico." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/558060.

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22

Farough, Aida. "An experimental study on characterization of physical properties of ultramafic rocks and controls on evolution of fracture permeability during serpentinization at hydrothermal conditions." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/76669.

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Serpentinization is a complex set of hydration reactions, where olivine and pyroxene are replaced by serpentine, magnetite, brucite, talc and carbonate minerals. Serpentinization reactions alter chemical, mechanical, magnetic, seismic, and hydraulic properties of the crust. To understand the complicated nature of serpentinization and the linkages between physical and chemical changes during the reactions, I performed flow-through laboratory experiments on cylindrically cored samples of ultramafic rocks. Each core had a well-mated through-going tensile fracture, to investigate evolution of fra

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23

Yang, Shenghong, and 杨胜洪. "The permian Pobei mafic-ultramafic intrusion (NE Tarim, NW China) and associated sulfide mineralization." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B45874219.

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24

FORNASARO, SILVIA. "Potentially toxic elements in ultramafic rocks and soils: A case study from the Voltri Massif (NW Italy)." Doctoral thesis, Università degli studi di Genova, 2019. http://hdl.handle.net/11567/944849.

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High concentrations of potentially toxic elements (PTEs) in surface and near-surface environment may be attributed to both anthropogenic sources, including industrial and agricultural activity, and geogenic source, mainly due to natural weathering of rocks. Considering the geogenic sources, ultramafic rocks (e.g., dunite, peridotite, pyroxenite, and serpentinites) are among the most critical from the environmental point of view; in fact, they are characterized by high contents of Cr, Ni, Co, and other PTEs which can have potential harmful impact on ecosystems and human health if released int

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25

Chevet, June. "Intrusive basaltic rocks and associated mafic / ultramafic cumulates from the thickened oceanic crust of the Kerguelen archipelago." Saint-Etienne, 2009. http://www.theses.fr/2009STET4012.

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This study presents mineralogical, geochemical and Sr, Nd, Hf, Pb, O isotopic results for intrusive rocks and ultramafic-mafic xenoliths that represent different levels of the thickened Kerguelen Archipelago crust. These results show that intrusive rocks have origins similar to those of the Kerguelen flood basalts. They have undergone fractional crystallisation surimposed on a general magmatic evolution from tholeiitic-transitional to alkaline affinities. Mafic and ultramafic xenoliths are cumulates from deep and shallow levels. They mostly crystallised from early tholeiitic-transitional serie

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26

Franchuk, Anatoliy. "HIGH TENOR NI-PGE SULFIDE MINERALIZATION OF THE SOUTH MANASAN ULTRAMAFIC INTRUSION, THOMPSON NICKEL BELT, MANITOBA." Thesis, Laurentian University of Sudbury, 2014. https://zone.biblio.laurentian.ca/dspace/handle/10219/2195.

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The South Manasan ultramafic intrusion (ca. 1880 Ma) located in the Early Proterozoic Thompson Nickel Belt (TNB) contains Ni and platinum group element (PGE) mineralization hosted by disseminated sulfide. Whole-rock Ni values range from 0.3 to 1.7 wt. % and total precious metals (TPMs) range from 0 to 1.3 ppm Pt + Pd + Au and equate to tenor values (i.e., metal in 100% sulfide) of 11-39 wt. % Ni and 8-27 ppm TPMs. The South Manasan intrusion is a steeply dipping sill-like body with a boudinaged outline having a strike length of approximately 1200 m, average width of 125 m and a minimum depth e

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Cox, Richard Alexander. "Eclogite facies metamorphism of mafic and ultramafic rocks in the Tshenukutish terrane, Manicouagan Imbricate Zone, eastern Grenville Province." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ54832.pdf.

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28

Lacinska, Alicja M. "Mineralogical and experimental study of serpentine minerals and ultramafic rocks with application to carbon capture and storage by mineralisation." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/32938/.

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The type of feedstock and host rock utilised in ex situ and in situ Carbon Capture and Storage by Mineralisation (CCSM) is an important aspect of these technologies, and detailed appraisal of candidate mineral/rock performance in the presence of CO2 may greatly improve CCSM efficiency. Here, a detailed mineralogical and geochemical investigation of serpentine minerals and ultramafic rocks under laboratory-controlled experiments simulating ex situ and in situ process conditions is presented. Feedstock serpentine minerals were analysed comprehensively, prior to experimental processing. The ident

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29

Gao, Jianfeng, and 高剑峰. "Petrogenesis of permian sulfide-bearing mafic-ultramafic intrusions insoutheast Chinese Altay and east Tianshan, NW China." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B49617801.

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The Central Asia Orogenic Belt is one of the largest accretionary orogenic belts in the world. In this belt, many sulfide‐bearing mafic‐ultramafic intrusions occur along faults, including the Kalatongke complex in southeast Chinese Altay and the Huangshandong intrusion in east Tianshan. The Kalatongke complex is a composite body including ~308Ma dioritic intrusion and 287Ma sulfide‐bearing mafic intrusion. The dioritic intrusion consists of biotite‐hornblende gabbro, diorite and quartz diorite. This intrusion was formed from a mixture of an evolved mantle‐derived magma and a crust‐derived ad

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SESSA, GIANLUCA. "GEOCHEMISTRY OF AMPHIBOLE FROM ARCHEAN AND EARLY PROTEROZOIC ULTRAMAFIC ROCKS: IMPLICATIONS FOR THE SECULAR EVOLUTION OF THE EARTH¿S MANTLE." Doctoral thesis, Università degli Studi di Milano, 2019. http://hdl.handle.net/2434/609805.

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Since its formation at 4.5 Ga, the Earth underwent a complex evolution that progressively differentiated its original composition into the reservoirs that we presently know. Our knowledge on the composition and differentiation mechanisms active in the Early and Ancient Earth are still fragmentary for the paucity of suitable preserved rock records. The poor knowledge on the Archean mantle composition arises a series of problems spanning from the effective chondritic composition of the Earth to how volatile elements (hydrogen, oxygen, chlorine and fluorine) were added to the Earth. For the unava

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Pearson, David Graham. "The petrogenesis of pyroxenites containing octahedral graphite and associated mafic and ultramafic rocks of the Beni Bousera peridotite massif, n. Morocco." Thesis, University of Leeds, 1989. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.442187.

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Anders, Heike Verfasser], Wolfgang [Akademischer Betreuer] Bach, and R. X. [Akademischer Betreuer] [Fischer. "Experimental investigations of interactions between saltwater and ultramafic rocks in hydrothermal systems / Heike Anders. Gutachter: Wolfgang Bach ; Reinhard X. Fischer. Betreuer: Wolfgang Bach." Bremen : Staats- und Universitätsbibliothek Bremen, 2012. http://d-nb.info/1071993593/34.

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Jeanpert, Julie. "Structure et fonctionnement hydrogéologiques des massifs de péridotites de Nouvelle-Calédonie." Thesis, La Réunion, 2017. http://www.theses.fr/2017LARE0047/document.

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Le fonctionnement et la structure hydrogéologiques des aquifères de socle des granites et des gneiss sont aujourd'hui relativement bien compris. En revanche, dans cet ensemble, les aquifères dans les péridotites sont très peu étudiés et mal compris. Dans ce contexte, les massifs obductés de Nouvelle-Calédonie présentent un laboratoire naturel exceptionnel pour améliorer la connaissance de cet hydrosystème original en contexte tropical. Ainsi l'objectif du présent travail de thèse est d'approfondir la connaissance de la structure et du fonctionnement hydrogéologiques de ces massifs. L'analyse p

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Ueda, Tadamasa. "Seismogenic deformation structures in the brittle-ductile transition regime: a case study of ultramafic pseudotachylytes and related deformed rocks in the Balmuccia peridotite body, Italy." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/204571.

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Mora, John Moises Guevara. "Metamorfismo das rochas ultramáficas de Olaria e Lima Duarte, Minas Gerais." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/44/44144/tde-08012011-205247/.

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A Nappe Lima Duarte, localizada na porção oriental do sistema orogênico Tocantins Meridional, sudoeste do estado de Minas Gerais, é constituída por rochas supracrustais de alto grau (gnaisses e micaxistos com e sillimanita e quartzitos) com lascas de ortognaisses arqueanos tonalíticos - granodioríticos (antigos terrenos TTG) tectônicamente intercaladas. É nesta Nappe de Lima Duarte que ocorrem os dois corpos metaultramáficos tema deste estudo. O corpo ultra máfico de Lima Duarte, bandado - estratificado, sem foliação evidente, encontra-se encaixado em uma zona de cisalhamento entre hornblend

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Denis, Carole. "Comportement de l'Hydrogène lors des processus mantelliques." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS036/document.

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Ces travaux de thèse apportent de nouvelles contraintes sur la concentration et le comportement de l’H dans le manteau lithosphérique et reposent sur l’étude pétro-géochimique de trois séries de xénolites de péridotites à spinelle, associant les concentrations en élément majeurs et en traces y compris l’H dans les minéraux dits anhydres (les NAMs, ici, olivine, pyroxènes) et hydratés (amphibole). Les effets de la remontée des xénolites dans du magma hôte sur les concentrations en H des NAMs ont pu être étudiés sur une série de xénolites de péridotite du champ volcanique d’Eifel (Allemagne). Un

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Xie, Qianli. "Trace element systematics of mafic-ultramafic volcanic rocks from the Archean Abitibi greenstone belt, Canada, implications for chemical evolution of the mantle and archean greenstone belt development." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq24020.pdf.

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ʻĀrif, Muḥammad Muḥammad. "Mineralogy, geochemistry and stable isotope studies of the ultramafic rocks from the Swat Valley Ophiolite, northwestern Pakistan : implications for the genesis of emerald and nickeliferous opaque phases." Thesis, University of Leicester, 1994. http://hdl.handle.net/2381/33625.

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The ulttamafic and related lithologies of the Swat valley ophiolite lie along the Main Mantle Thrust (MMT) between the Kohistan island arc and Indo-Pakistan plate. The textural and mineralogical characteristics of the ultramafic rocks seem to be the result of a complex interplay of a number of processes including partial melting, serpentinization, metamorphism, carbonation and late-stage hydrothermal alteration. The modal mineralogy of the least modified varieties (non-carbonated serpentinized) of the ultramafic rocks indicate that the majority of them them are harzburgites. The chemical compo

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Sossi, Paolo. "Petrogenesis of ultramafic rocks and an experimental and natural investigation of non-traditional stable isotope fractionation at high temperatures : implications for the chemical evolution of the earth and planets." Phd thesis, Canberra, ACT : The Australian National University, 2015. http://hdl.handle.net/1885/124061.

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The fractionation of stable isotopes at high temperatures offers a unique insight into the sources and processes operative during planetary accretion. Through analysis of meteorites and samples that are representative of planetary reservoirs, a coherent picture is built of the isotopic variation present in solar system materials. However, this objective is complicated by the selection of samples appropriate to characterise the isotopic composition of the entire Earth. In minimising the uncertainty in this assumption, ultramafic (olivine-rich) rocks are used, as these are most representati

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LUONI, PIETRO. "MULTISCALE STRUCTURAL ANALYSIS OF ULTRAMAFIC ROCKS IN THE DIFFERENT STRUCTURAL DOMAINS OF THE ALPS, INTEGRATED WITH PETROLOGY AND GEOCHEMISTRY: A KEY TO UNRAVEL THE GEODYNAMIC INTERPRETATION OF COLLISIONAL BELTS." Doctoral thesis, Università degli Studi di Milano, 2020. http://hdl.handle.net/2434/718368.

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In questa tesi si applica un’indagine multidisciplinare guidata dall’analisi strutturale per studiare l’evoluzione tettono-metamorfica di rocce ultrafemiche appartenenti a unità ofiolitiche affiorati nella parte occidentale delle Alpi o intrappolate nel basamento prealpino durante la collisione varisica. L’analisi si focalizza sulla Zona Zermatt-Saas (ZSZ) in alta Valtournanche (AO), al contatto di questa zona e la parte esterna del bordo meridionale della Zona Sesia Lanzo nella Valli del Tesso e del Tessuolo (TO) e nel Massiccio dell’Argentera, in alta Valle Gesso (CN). Le prime due aree si t

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Almada, Jennifer Cardoso Farias. "Evidências petrográfica, geoquímica e geocronológica do magmatismo alcalino do arco magmático de Goiás na região de Cocalinho, na porção leste do estado de MT." Universidade Federal de Mato Grosso, 2015. http://ri.ufmt.br/handle/1/172.

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Oliveira, Regiane Ferreira de. "Petrografia, geoquímica e geocronologia Sm/Nd das rochas do complexo máfico - ultramáficos trincheira : divisa Mato Grosso-Rondônia, Sw do Cráton Amazônico." Universidade Federal de Mato Grosso, 2014. http://ri.ufmt.br/handle/1/587.

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Rochette, Pierre. "La susceptibilité anisotrope des roches faiblement magnétiques : origines et applications : [thèse soutenue sur un ensemble de travaux]." Phd thesis, Grenoble 1, 1988. http://tel.archives-ouvertes.fr/tel-00745513.

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La susceptibilité des roches faiblement magnétiques a une origine complexe : aux grains ferromagnétiques se rajoutent des contributions dla-, para-, et antlferromagnétiques. Celles-ci ont été mises en évidence grâce à de nouvelles techniques de mesures magnétiques en champ fort et température variable. Les propriétés liées aux phyllosilicates et carbonates ferromagnétiques, à la pyrrhotite et à la goethite ont été particulièrement étudiées. La susceptibilité magnétique ainsi analysée permet de suivre l'évolution pétrologique des roches, en particulier en fonction du métamorphisme et de l'altér

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Ben, Jamaa Néjib. "Les peridotites de bay-of-islands (terre neuve) et de cap ortegal (espagne) : approche petro-structurale." Paris 7, 1988. http://www.theses.fr/1988PA077010.

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Une nouvelle approche petrologique pour definir l'evolution des roches ultramafiques des massifs ophiolitiques est etablie, par l'etude petrochimique d'une serie harzburgitique de cherzolitique situe a terre neuve et par l'etude structurale et petrologique des peridotites et websterites du complexe du cap ortegal (espagne). Ce travail sert de support pour definir la methodologie permettant de suivre l'evolution des parametres chimiques lors d'une fusion partielle

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Pasquet, Camille. "Evaluation de la biodisponibilité du nickel, cobalt et manganèse dans les poussières de sols ultramafiques et développement d'un outil de bioindication lichénique des poussières émises par les activités minières en Nouvelle Calédonie." Thesis, Nouvelle Calédonie, 2016. http://www.theses.fr/2016NCAL0008/document.

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Les terrains ultramafiques de Nouvelle-Calédonie, riches en Ni, Co, Mn et Cr sont exploités par des mines à ciel ouvert, ce qui génère l'émission de poussières riches en métaux. L'objectif de ce travail est de développer des approches pour estimer le risque environnemental lié aux poussières émises par les mines à ciel ouvert et les usines de traitement du minerai de nickel. L'estimation de la fraction biodisponible des métaux contenus dans deux fractions granulométriques de poussières, celle inférieure à 100 ~m mobilisable par le vent (F<1 OO~m.) et celle susceptible de pénétrer le système

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Labou, Ibrahima. "Les complexes mafiques et ultramafiques birimiens de la ceinture de Mako (Sénégal oriental) témoins d'une évolution d'un domaine intra-océanique vers un domaine d'arc insulaire." Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30306.

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Les données isotopiques et en éléments en traces sur roches et minéraux de la région de Mako au Sénégal, mettent en évidence l'existence au sein de la croûte birimienne de roches magmatiques diversement différenciées (de cumulats ultramafiques à rhyolite) provenant de trois sources magmatiques parfaitement identifiées : une source déprimée plus juvénile à l'origine de la lignée tholéiitique 1 ; une source faiblement enrichie à l'origine de la lignée tholéiitique 2 et une source très enrichie dont est issue la lignée calco-alcaline. On peut ainsi proposer pour le groupe de Mako l'évolution géod

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Georgiou, Elena. "Geologie, petrologie et petrochimie du complexe plutonique de la foret d'akapnou, chypre, et des gites de chromite associes." Orléans, 1987. http://www.theses.fr/1987ORLE2033.

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L'etude cartographique en depit d'un tectonique complexe, a permis d'observer de bas en haut: sequence mantelique (harzburgites a enclaves dunitiques); sequence cumulative (dunite principale, plastiquement deformee, wchrlites, pyroxenites, gabbros et plangiogranites)

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BENOIT, VINCENT. "Etat d'equilibre de peridotites du manteau superieur : application au plateau du colorado." Paris 7, 1987. http://www.theses.fr/1987PA077186.

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Deux nouvelles calibrations de methodes thermobarometriques a partir de donnees experimentales. La premiere basee sur la solubilite de diopside entre clinopyroxene et orthopyroxene. Elle prend en compte l'effet d'elements mineurs tels que na et fe. Ce thermobarometre, combine avec le thermometre base sur la solubilite de l'enstatite dans les deux pyroxenes fournit un bon outil pour tester l'etat d'equilibre des peridotites a spinelle. La deuxieme calibration est basee sur la solubilite du chrome dans la spinelle et le grenat coexistants

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Edou-Minko, Ambroise. "Pétrologie et géochimie des latérites à "stone-line" du gite d'or d'Ovala : application à la prospection en milieu équatorial humide (Gabon)." Poitiers, 1988. http://www.theses.fr/1988POIT2333.

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Des ensembles d'alterations sont distingues, et les processus majeurs de formations des horizons type isalterite a kaolinite, gibbsite, hematite et goethite sont decrits. Les mineralisations en or associees a ces formations sont de differents types. Une methode de prospection de l'or dans les materiaux lateritiques en milieu equatorial humide est proposee

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Frison, Jean-Yves. "Les peridotites du massif ophiolitique du vourinos (grece) : etude petro-structurale, mise en evidence d'une structure diapirique." Paris 7, 1987. http://www.theses.fr/1987PA077112.

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L'etude petrographique des facies permet de scinder le vourinos en trois unites lithologiques. L'analyse des donnees structurales, texturales et petrologiques conduit a interpreter le vourinos en terme de diapirisme. Par ailleurs, la determination de la composition chimique des differentes phases minerales et des conditions thermobarometriques revelent que les peridotites ont subi une rehomogeneisation a basse temperature et sous l'effet de le percolation de phase fluide. On considere que le cortege ophiolitique du vourinos resulte d'une refusion locale d'un manteau oceanique deja appauvri, vr

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