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Dissertations / Theses on the topic 'Rare earth minerals'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Cui, Jianlan. "Surface Spectroscopic Investigation of Rare Earth Minerals Flotation." Thesis, Griffith University, 2016. http://hdl.handle.net/10072/367258.

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This thesis describes fundamental studies of the surface interactions between rare earths and the collector hydroxamate to obtain a mechanistic understanding of the flotation process. A model and systematic investigation has been undertaken in order to ascertain the flotation mechanism and optimise flotation response and selectivity. Major constituent components (rare earth oxides, minerals and gangue minerals) in the flotation system were fully characterized individually prior to the interaction investigations. Six rare earth hydroxamate model compounds have been synthesized to characterize t

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2

Fathollahzadeh, Homayoun. "Biomining of Rare Earth Elements from Phosphate Ores and Minerals." Thesis, Curtin University, 2018. http://hdl.handle.net/20.500.11937/74946.

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Rare earth elements (REEs) are important for establishing a technology based society, however are difficult to process. The use of biomining for the extraction of REEs minerals offers a benign alternative to conventional hydrometallurgical routes with more selective solubilisation of REEs over radionuclides. The use of phosphate solubilising microorganisms in the bioleaching of REEs was investigated to gain a better understanding of the leaching behaviour of individual REEs and the mechanism attributed to their mobilisation.

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3

Heffernan, Karina May. "The Effect of Composition on the High-Pressure Behavior of Rare-Earth Phosphate Minerals." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/81910.

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A comprehensive study on the effect of composition on the structural and elastic properties of MPO4 (M = Ce3+, Gd3+, Tb3+, Y3+, Sc3+) compounds has been completed. CePO4 and GdPO4 are isostructural with monazite (P21/n), and TbPO4, YPO4, and ScPO4, are isostructural with xenotime (I41/amd). Raman spectra are consistent with previous studies and high-pressure spectra showed no phase transitions up to 10 GPa under hydrostatic conditions. The spectra were used to develop Kieffer-type lattice vibrational models to calculate heat capacities of CePO4 and YPO4 and the results lie within 1-3% of expe

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4

Kegley, Dalton Curtis. "Economic Potential of Rare Earth Elements Within Accessory Minerals of Granitic Pegmatite Mine Tailings." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/104065.

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Rare Earth elements (REEs) are economically important due to their critical applications within multiple industries. This study investigates the Spruce Pine district of North Carolina, testing the economic feasibility of repurposing current mine waste tailings as a rare earth element resource. Spruce Pine is home to several active quartz and feldspar mining operations, with large waste tailing piles generated during the separation process for quartz and feldspar. The mineralogy, composition, and REE budget of the tailings was examined to assess the economic viability of rare earth element extr

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5

Azizi, Dariush. "Phosphonium/ammonium-based ionic liquids for rare earth minerals beneficiation : case of monazite and bastnäsite." Doctoral thesis, Université Laval, 2018. http://hdl.handle.net/20.500.11794/29992.

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Tableau d'honneur de la Faculté des études supérieures et postdoctorales, 2017-2018<br>Cette thèse de doctorat porte sur l'application des liquides ioniques à base de phosphonium et d'ammonium pour l'enrichissement des minéraux à base d'éléments de terres rares. Le manuscrit de thèse a été divisé en quatre parties principales. Tout d'abord, l'utilisation des liquides ioniques à base de phosphonium et d'ammonium a été explorée dans trois procédés différents pour la valorisation des minéraux de terres rares. Ces trois approches ont été examinées pour des minéraux à base d’éléments de terres rare

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6

Lazo, Daniel Eduardo. "Selective Complexation Leaching of Rare Earth Minerals: A New Hydrometallurgical Route Inspired by Geochemical Process." Thesis, Curtin University, 2019. http://hdl.handle.net/20.500.11937/79965.

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This present study was intended to determine the potential of organic acids in REEs, specifically in monazite concentrate. The proposed process in this study consisted of a pre-treatment, leaching and RE hydroxide precipitation stages. The first stage consisted of producing rare earth (RE) oxalates by leaching monazite concentrate with oxalic acid. The second stage involved the extraction of the metals from the residue. The third stage involved the conversion of RE oxalate EDTA complex in the solution to a RE hydroxide.

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7

Vikström, Hanna. "Rare Metals: Energy Security and Supply." Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-168130.

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Lithium and neodymium are two critical materials in our modern society, many technological solutions depend on them. Lithium is used in batteries, which are used in cars and portable electronics. Neodymium, which is a rare earth element, is mainly used in permanent magnets which are used in smartphones, hard disc drives and turbines. There are many reports regarding the availability of the metals, with different results. The available data on the reserves varies considerably, from the few sources there are. In this report, based on geological availability, forecasts are done to investigate how

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8

Maskenskaya, Olga M. "Abundance and fractionation of rare earth elements in calcite and other secondary minerals in fractures in the upper kilometre of crystalline bedrock, SE Sweden." Doctoral thesis, Linnéuniversitetet, Institutionen för biologi och miljö (BOM), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-37547.

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This thesis focuses on the geochemistry of secondary minerals, mainly calcite but also others such as fluorite and Ca/Al silicates, precipitated throughout the last 1.5 billion years in fractures of crystalline rock, SE Sweden. The work was based on previous reconnaissance studies and has been possible thanks to access to high-quality drill cores and associated mapping data provided by the Swedish Nuclear Fuel and Waste Management Co (SKB). Concentrations of rare earth elements (REEs) and occasionally other metals were determined in a variety of secondary minerals from fractures (mainly open s

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9

Moorehead, Anthony J. "IGNEOUS INTRUSIONS AT HICKS DOME, SOUTHERN ILLINOIS, AND THEIR RELATIONSHIP TO FLUORINE-BASE METAL-RARE EARTH ELEMENT MINERALIZATION." OpenSIUC, 2013. https://opensiuc.lib.siu.edu/theses/1240.

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Hicks Dome is a mineralized intrusive center of alkaline ultramafic dikes, plugs and diatreme breccias that produced ~1200 m of structural doming of Paleozoic sedimentary rocks in southeastern Illinois. It is part of an igneous province referred to as the "Wauboukigou Alnöite Province" or "Middle Mississippi Alkaline Province". The 40Ar/39Ar dating of biotite and hornblende from igneous rocks throughout the region has consistently produced crystallization ages of 270 +/- 2 Ma (Early-Middle Permian). Hicks Dome lies near the intersection of two aulacogens, the Reelfoot Rift and the Rough Creek

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10

Lim, Hazel. "Leaching of Rare Earths from Eudialyte Minerals." Thesis, Curtin University, 2019. http://hdl.handle.net/20.500.11937/75841.

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The (a) sulfuric and (b) citric acid leaching of rare earths from two differently textured eudialyte minerals were investigated through leaching tests conducted using Taguchi and fractional factorial design of experiments. Results of the leaching studies showed that the use of novel method of citric acid yielded comparable leaching recoveries of 70-80 % to conventional sulfuric acid method on direct leaching of large-grained eudialyte. Fine-grained eudialyte required rigorous conditions for rare earths leaching.

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11

Buratovic, Emma, Dervis Cocalic, Kasper Eliasson, Matilda Danestig, and Linus Everlid. "Controversial Materials : Ethical issues in the production of mineral based raw materials." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-327393.

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This report has investigated the ethical issues associated with mining or processing of materials that make them considered as controversial. For each material, the main areas of use and the top producing countries are analysed, followed by social and/or environmental issues as well as potential problems in the future. In total, 13 materials are discussed, of which most are minerals. The overall issues, that are recurring throughout the report and are important to be aware of are: child labor, low safety standards, mining activity resulting in deforestation or harming biodiversity, mining proc

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Robinson, Katie Jane. "Electrochemical studies of rare earth and transition metals in molten NaCl-KCl." Thesis, Imperial College London, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296988.

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13

Turner, David James. "Reflectance spectroscopy and imaging spectroscopy of rare earth element-bearing mineral and rock samples." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/52954.

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A significant knowledge gap between the fields of reflectance spectroscopy and rare earth element (REE) mineralogy prompted this research effort. It narrows the knowledge gap through detailed study of thirty three samples representing three important mineral classes: REE fluorocarbonates (bastnaesite, synchysite, and parisite), REE phosphates (monazite, xenotime, and britholite), and REE-bearing silicates (cerite, mosandrite, kainosite, zircon and eudialyte). Reflectance spectroscopy was carried out in the visible to short wave infrared regions (500 nm to 2500 nm) and each sample was character

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14

Verrax, Fanny. "Making sense of rare earth elements : an interdisciplinary approach to mineral resources' ethics and governance." Versailles-St Quentin en Yvelines, 2013. http://www.theses.fr/2013VERS007S.

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This interdisciplinary PhD dissertation aims to identify and address the ethical challenges posed by rare earth elements, as a non-renewable, ill-distributed, and valuable resource. The overall theoretical framework iwhich this study is conducted is the one of Post-Normal Science (PNS), in which stakes are high, facts are uncertain and values are in dispute, a description that fits perfectly rare earth elements. One of the flagship recommendations of PNS is the need to rethink the way technocratic decisions are made, so as to involve more people, and more lay-people, when addressing an issue t

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15

Friis, Henrik. "Luminescence spectroscopy of natural and synthetic REE-bearing minerals." Thesis, St Andrews, 2009. http://hdl.handle.net/10023/756.

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16

Lozano, Letellier Alba. "Geochemistry of rare earth elements in acid mine drainage precipitates." Doctoral thesis, Universitat de Barcelona, 2019. http://hdl.handle.net/10803/668458.

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Rare earth elements (REE) are known as the lanthanide series (La-Lu) plus yttrium (Y) and scandium (Sc). REE are essential materials for modern industries and especially for green technologies (wind turbines, batteries, lasers, catalysts, etc.). However, despite their high global demand, their supply is limited such that the EU has cataloged it as critical raw materials. In order to ensure the supply of REE in the future, the search for alternative sources of these elements worldwide has been promoted in recent years. Acid mine drainage (AMD) produced by the Fe-sulphide weathering can effecti

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Wall, Frances. "Mineral chemistry and petrogenesis of rare earth-rich carbonates with particular reference to the Kangankunde carbonatite, Malawi." Thesis, University of London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393646.

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18

Antoniassi, Juliana Lívi. "Caracterização tecnológica de recursos minerais de terras raras em complexos alcalinos e alcalino-carbonatíticos do Brasil." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/3/3134/tde-27112017-143927/.

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Este trabalho enfocou o levantamento de informações químicas e mineralógicas de detalhe em amostras de depósitos alcalinos e alcalino carbonatíticos brasileiros contento terras raras, de modo a fornecer subsídios para o desenvolvimento de processos de aproveitamento. Estes depósitos apresentam elevados volumes de recursos, baixos teores de elementos de terras raras (essencialmente terras raras leves) e elevada complexidade mineralógica. As amostras estudadas são provenientes de depósitos lateríticos, com teor total de óxidos de terras raras entre 1,27 e 6,45%, sendo a monazita o principal mine

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19

Barth, Wolfgang H. "Geology of the Cleveland tin mine, Tasmania, Australia, with special reference to mineral chemistry and rare earth distribution /." Heidelberg : Mineralogisch-Petrographischen Instituts der Universität Heidelberg, 1986. http://catalogue.bnf.fr/ark:/12148/cb37428675x.

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20

Al-Ali, Safaa Hussein Ali. "Mineralogy and mineral processing to optimise recovery of synchysite-(Ce) and apatite from carbonatite at Songwe Hill, Malawi." Thesis, University of Exeter, 2016. http://hdl.handle.net/10871/28823.

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Rare earth elements (REE) are considered as critical and non-substitutable metals for electronics and green technology. A greater diversity of supply is needed and the REE occur in a wide range of REE- and REE-bearing minerals within different ore deposit types. The beneficiation processes for REE ores can vary widely based on their mineralogy and texture. It is, therefore, essential to understand the mineralogical characteristics when designing processing routes. Little research was carried out on this topic until the last few years, apart from bastnäsite, monazite, and xenotime, and most REE

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21

Alvarez, Helder Ivan. "Chemistry of brine in an unconventional shale dominated source bed understanding water- organic material-mineral interactions during hydrocarbon generation." Thesis, Kansas State University, 2015. http://hdl.handle.net/2097/19079.

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Master of Science<br>Department of Geology<br>Sambhudas Chaudhuri<br>The exploration and development of unconventional shale plays provide an opportunity to study the hydrocarbon generation process. These unconventional plays allow one to investigate the interactions between the fluid, mineral, and organic material that occur in a hydrocarbon-generating source bed, before any changes in composition that may occur during secondary migration or post migration processes. Previous studies have determined the chemical constituents of formation waters collected from conventional reservoirs after sec

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22

Ntiharirizwa, Seconde. "Les minéralisations en Eléments de Terres Rares de la région de Gakara (Burundi) : contrôle structural, caractérisation pétrologique et géochimique, modèle métallogénique." Thesis, Rennes 1, 2019. https://ged.univ-rennes1.fr/nuxeo/site/esupversions/2613ecfc-fc24-4a52-84c9-f0ea9d943359.

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Le gisement de Gakara au Burundi est l’un des plus riches gisements en Eléments de Terres Rares (ETR) au monde. La zone du rift est-africain est l’hôte bien connu de nombreuses carbonatites et complexes alcalins associés, mis en place de façon récurrente depuis plusieurs centaines de millions d’années. Les grands gisements d’ETR exploités aujourd’hui dans le monde sont associés à des complexes carbonatitiques. Dans ces complexes, les minéralisations font rarement partie de l’assemblage minéralogique primaire ; elles précipitent à partir des fluides évolués à partir des intrusions magmatiques.

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23

Adelman, Jessica. "Mineral interactions in a gold mining environment: change in oxidation rate of stibnite as affected by the addition of varying amounts of pyrite in an oxygenated flow through system." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=92390.

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It is thought that a significant mechanism of stibnite (Sb2S3) oxidation in mine wastes is through contact with a mineral of greater rest potential (whereby the outer valence shell electrons operate at a higher energy level), such as pyrite (FeS2). The goal of this research is to determine if the oxidation of stibnite in an oxygenated flow through system was increased through contact with minerals of greater rest potential such as pyrite and arsenopyrite (FeAsS) and whether this electro-chemical reaction was affected by various ratios of stibnite to pyrite (or arsenopyrite) and slightly acidic

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24

Holbik, Sven P. "Arc Crust-Magma Interaction in the Andean Southern Volcanic Zone from Thermobarometry, Mineral Composition, Radiogenic Isotope and Rare Earth Element Systematics of the Azufre-Planchon-Peteroa Volcanic Complex, Chile." FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1524.

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The Andean Southern Volcanic Zone (SVZ) is a vast and complex continental arc that has been studied extensively to provide an understanding of arc-magma genesis, the origin and chemical evolution of the continental crust, and geochemical compositions of volcanic products. The present study focuses on distinguishing the magma/sub-arc crustal interaction of eruptive products from the Azufre-Planchon-Peteroa (APP 35°15’S) volcanic center and other major centers in the Central SVZ (CSVZ 37°S - 42°S), Transitional SVZ (TSVZ 34.3-37.0°S), and Northern SVZ (NSVZ 33°S - 34°30’S). New Hf and Nd isotopi

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Veras, Moacir Medeiros. "Detecção de minério portador de elementos de terras raras do depósito de Pitinga/AM, Brasil assistido por tecnologia de sensor-based sorting." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2018. http://hdl.handle.net/10183/182326.

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Este trabalho avalia a afinidade da tecnologia de sensor-based sorting (SBS) assistido com sensor de imagem Charge Couple Device CCD e de Dual Energy-Xray Transmission (DE-XRT) para detectar minérios portadores de elementos de terras raras (ETR). As amostras foram coletadas in situ no depósito de Pitinga/AM-Brasil e enviadas para o LAPROM/UFRGS. Os testes foram realizados sob as mesmas condições operacionais com ambos sensores. As partículas examinadas estão na fração de tamanho entre -10 +5 (cm), limpas e secas antes dos testes. A alimentação para o sorting foi feita manualmente, uma partícul

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26

Griffault, Lise. "Bilan des transferts de matière (majeurs et terres rares) dans les altérations hydrothermales des granites : exemple du granite du ballon d'alsace (vosges méridionales)." Poitiers, 1987. http://www.theses.fr/1987POIT2302.

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Etude de deux systemes d'alteration hydrothermale: - une alteration pervasive, se manifestant par la chloritisation des ferromagnesiens, le formation d'illite dans les plagioclases et la cristallisation de calcite; - une alteration a illite dans les epontes de veines liees a la mise en place de filins de fluorine. Cette etude montre que le comportement geochimique des terres rares ne peut etre assimile au comportement des elements majeurs au cours des processus hydrothermaux ou des mineraux argileux sont formes. Les mecanismes de fixation des terres rares correspondent a des phenomenes de sorp

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Kahn, Henrique. "Caracterização e desenvolvimento de processo de beneficiamento do minério primário de Pitinga (AM) - criolita, estanho, zircônio, nióbio, ítrio e terras raras." Universidade de São Paulo, 1991. http://www.teses.usp.br/teses/disponiveis/3/3134/tde-20042017-091600/.

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Os estudos visando o aproveitamento dos minerais de interesse econômico associados ao Granito Madeira, Pitinga, AM, foram subdivididos em três etapas. A primeira etapa compreendeu a realização de estudos de caracterização tecnológica, com um detalhado estudo mineralógico enfocando a forma de ocorrência e granulometria de liberação dos minerais de interesse. Foi identificado pela primeira vez a presença de criolita, mineral raro, cujo valor agregado supera o conjunto de todos os demais minerais de interesse econômico. Verificou-se que a granulometria de liberação dos minerais pesados era muito

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Mohammad, Nour. "Géopolitique et géoéconomie des terres rares. La politique de relance de la production des « Terres Rares » par les États-Unis : enjeu géoéconomique, enjeu géopolitique ou enjeu environnementale ?" Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLV081.

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Cette thèse de doctorat se fixe tout particulièrement pour objectif d’apporter un éclairage sur la problématique de la production des éléments de terres rares aux États-Unis. Ces minéraux, aux qualités nucléaire très particulières, constituent des intrants cruciaux dans certaines technologies et industries stratégiques : technologies « vertes », technologies d’information et de communication, ainsi que dans les technologies militaires. Ces minéraux stratégiques constituent aujourd’hui un enjeu géoéconomique mais aussi géopolitique et environnemental majeur. En 2011, 97 % des éléments de terres

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Bosze, Stephanie Lynn. "SURFACE STRUCTURALLY CONTROLLED SECTORAL ZONING IN FLUORITE: IMPLICATIONS TO UNDERSTANDING HETEROGENEOUS REACTIVITY AT THE MINERAL-WATER INTERFACE." Oxford, Ohio : Miami University, 2001. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami981052842.

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Pereira, Fernando. "Production d'acide phosphorique par attaque chlorhydrique de minerais phosphatés avec réduction des nuisances environnementales et récupération des terres rares en tant que sous-produits." Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 2003. http://tel.archives-ouvertes.fr/tel-00802984.

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La voie sulfurique pour la production d'acide phosphorique (destiné à l'industrie des engrais) présente de nombreux inconvénients : impossibilité de récupération de sous-produits de haute valeur commerciale tels les terres rares, existence de fortes restrictions conditionnées par les lois de protection de l'environnement, 250 millions de tonnes de phosphogypse impur et radioactif annuellement produites, problèmes environnementaux liés au stockage du phosphogypse (pollution des nappes phréatiques, des cours d'eau, ). Cette technologie de traitement de la roche phosphatée est de loin la plus rép

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Rocha, B?rbara Gon?alves. "Avalia??o da efici?ncia qu?mica de catalisadores heterog?neos baseados em min?rios e rejeitos de minera??o nas rea??es de transesterifica??o de triacilglicer?is de bio-?leo." UFVJM, 2017. http://acervo.ufvjm.edu.br/jspui/handle/1/1732.

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?rea de concentra??o: Produtos e coprodutos.<br>Submitted by Jos? Henrique Henrique (jose.neves@ufvjm.edu.br) on 2018-06-22T19:43:47Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) barbara_goncalves_rocha.pdf: 2671242 bytes, checksum: 17dfa18bc6c5622c294695227a582c58 (MD5)<br>Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2018-07-18T12:29:56Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) barbara_goncalves_rocha.pdf: 2671242 bytes, checksum: 17dfa18bc6c56

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Malki, Mustapha. "Proprietes structurales, magnetiques et electroniques d'oxydes ternaires de terres-rares." Université Louis Pasteur (Strasbourg) (1971-2008), 1987. http://www.theses.fr/1987STR13143.

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Etude des composes limlno::(4), ou m = eu, sr; ln = eu, gd, dy, er, y. Mesures de susceptibilite et d'aimantation, mesures des interactions hyperfines au site des terres rares par effet moessbauer. Temperature de mise en ordre magnetique; structure cristallographique; moment magnetique; parametres de champ cristallin d'ordre 2 au site des lanthanides

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Ralph, Martin I. "Towards establishing a fit-for-purpose regulatory framework for radiation protection in Western Australia's mining industry: Evaluating mine worker exposures to naturally occurring radionuclides." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2023. https://ro.ecu.edu.au/theses/2642.

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Mining in the state of Western Australia (WA) formally commenced in the 1840s, and over the ensuing 180 years has evolved to be the epicentre of the Australian mining industry and a significant contributor to the national economy. The lithology of WA is replete with mineralisation that hosts uranium and “critical minerals” required for the global renewable energy sector. The state’s first uranium mine is under development, and high levels of activity are occurring in the state’s nascent critical minerals sector, with 168 WA-based companies pursuing rare earths-bearing minerals, 51 of which are

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Nasraoui, Mohamed. "Le gisement de niobium de Lueshe (Nord Est du Zaïre). Evolution géochimique et minéralogique d'un complexe carbonatitique en contextes hydrothermal et supergène." Phd thesis, Ecole Nationale Supérieure des Mines de Paris, 1996. http://tel.archives-ouvertes.fr/tel-01044772.

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Le complexe plutonique (5 16 Ma ± 26) alcalin de Lueshe (NE Zaïre) est composé d'un corps syénitique bordé de carbonatites (sovite et béforsites). Des inclusions de composition minéralogique proche des syénitiques (nodules centimétriques à métrique) sont sporadiquement distribuées dans la sovite. Les nodules correspondraient à des fragments de composition syénitique incorporés et partiellement assimilées par le magma carbonatitique lors de sa mise en place. Leur composition chimique est intermédiaire entre celle des syénites et celle des carbonatites, alors que leur rapport TaINb est proche de

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Thorette, Jacques. "Contribution à l'étude de l'hydrothermalisme océanique : exemple du district minéralisé de York-Harbour (massif ophiolitique de Blow-Me-Down, Bay-of-Islands, Terre-Neuve)." Brest, 1986. http://www.theses.fr/1986BRES2002.

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Les mineralisations a cu-fe-zn de york-harbour sont encaissees dans l'unite volcanique situee au sommet de l'ophiolite cambrienne de blow-me-down. Celle-ci s'est formee a l'axe d'une dorsale oceanique a proximite d'une faille transformante. L'organisation en synclinal du secteur mineralise resulte du rejet des failles synvolcaniques en direction nord 135 et nord 45

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Moulahoum, Omar. "Dualité du magmatisme d'âge pan-africain : Aspects structuraux et pétrologiques des granites subalcalins et alumineux de la région de Tamanrasset (Hoggar central, Algérie." Nancy 1, 1988. http://www.theses.fr/1988NAN10049.

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Durant l'orogène du "Pan-Africain" (~ 600 Ma), la région du Hoggar central, à l'instar de l'ensemble du Bouclier Touareg, a été intensément affectée. Cet évènement est accompagné de la mise en place d'ensembles magmatiques variés. Dans la région de Tamanrasset, deux magmatismes de nature différente sont mis en évidence : magmatisme subalcalin et magmatisme alumineux. Le premier est représenté par les massifs syn à tardi-orogéniques (Anfeg - Tifferkit), voire post-orogénique (Aheleheg') tandis que le second est exclusivement constitué par les plutons post-orogéniques (In-Tounine et intrusions g

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Mackay, Duncan Alisdair Robert. "Development of mineralogical and geochemical exploration techniques for carbonatite-related Nb (±Ta) and REE deposits in the Canadian Cordillera." Thesis, 2015. http://hdl.handle.net/1828/5991.

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Niobium and rare earth elements (REE) are considered as strategic metals in industrialised countries, and are mainly derived from carbonatite-related deposits. Indicator mineral methods for carbonatites using of portable XRF and Quantitative Evaluation of Materials by Scanning Electron Microscopy (QEMSCAN®), shows promise in exploration for Nb and REE. Portable XRF analysis of stream sediments from the Aley, Lonnie, and Wicheeda carbonatites identified 125-250 μm as the ideal size fraction for indicator mineral studies. QEMSCAN® provides (with no additional processing) detection and characteri

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Schmandt, Daniella Sierra. "Mineralogical distributions of radionuclides in copper-uranium ores, Olympic Dam, South Australia." Thesis, 2019. http://hdl.handle.net/2440/120092.

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Deposits of iron-oxide-copper-gold (IOCG) type are the most important copper resource in South Australia. These deposits also contain uranium and other minor non-target elements which need to be removed for the successful generation of clean concentrates. This necessitates a sound understanding of the physical location and chemical speciation of non-target elements in ore and throughout processing. This information is only achievable through detailed mineralogy and understating of changes to mineral chemistry during processing. The research composing this thesis is a contribution to a larger i

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Ismail, Roniza. "Spatial-temporal evolution of skarn alteration in IOCG systems: evidence from petrography, mineral trace element signatures and fluid inclusion studies at Hillside, Yorke Peninsula, South Australia." Thesis, 2016. http://hdl.handle.net/2440/112582.

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Hillside is a newly-discovered, undeveloped copper resource related to Mesoproterozoic Hiltaba Suite intrusives along the crustal-scale Pine Point fault on the eastern margin of the Yorke Peninsula, South Australia. Mineralogical and petrographic study was undertaken on ~100 samples representative of all lithologies, parts of the deposit, and evolution from magmatic through prograde and retrograde skarn to late-stage hydrothermal overprint. Emphasis was placed on distributions of REE+Y and other trace elements in main minerals, and on the constraints these patterns provide for processes associ

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Alexander, Brian W. Brantley Susan Louise. "Controls on groundwater chemistry in the Cape Cod Aquifer, Massachusetts the impact of accessory mineral phases on solute concentrations, 87sr/86sr, and rare earth element distributions /." 2009. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-3742/index.html.

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