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Tesi sul tema "REE geochemistry"

Autore: Grafiati
Pubblicato: 10 dicembre 2022
Ultima modifica: 31 luglio 2025

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1

Zhong, Shaojun. "Precipitation kinetics and partitioning of rare earth elements (REE) between calcite and seawater." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41198.

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Abstract (sommario):
A novel and simple "constant-addition" technique was used to study calcite precipitation kinetics and the partitioning of REE between calcite overgrowths and their parent seawater solutions under steady state conditions.<br>As a consequence of solute interactions in solution and at the growing mineral surface, the calcite precipitation mechanism in seawater is complex. It is dominated by the following reversible overall reaction: $ rm Ca sp{2+}+CO sbsp{3}{2-} rightleftharpoons CaCO sb3.$ A kinetic expression is proposed which describes the precipitation rate according to this reaction. A parti
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2

Ramirez-Caro, Daniel. "Rare earth elements (REE) as geochemical clues to reconstruct hydrocarbon generation history." Thesis, Kansas State University, 2013. http://hdl.handle.net/2097/16871.

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Master of Science<br>Department of Geology<br>Matthew Totten<br>The REE distribution patterns and total concentrations of the organic matter of the Woodford shale reveal a potential avenue to investigate hydrocarbon maturation processes in a source rock. Ten samples of the organic matter fraction and 10 samples of the silicate-carbonate fraction of the Woodford shale from north central Oklahoma were analyzed by methods developed at KSU. Thirteen oil samples from Woodford Devonian oil and Mississippian oil samples were analyzed for REE also. REE concentration levels in an average shale range fr
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3

Sahlström, Fredrik. "Ore Petrography and Geochemistry of some REE-bearing Fe-oxide Assemblages from the Idkerberget Deposit, Bergslagen, Sweden." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-182875.

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The mine dumps of Kiruna-type apatite-iron oxide ore in Bergslagen, South Central Sweden, contain elevated amounts of rare earth elements (REEs). A recently started project at Uppsala University has been initiated to study these ores among others in order to document occurrences of REEs and other critical elements in the mine dumps. In this study a selection of samples from the Idkerberget deposit have been studied with respect to their geochemistry and petrography with a special focus on REE-bearing phases. In addition, their mining potential and their relationship to related ore deposits suc
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4

Aiglsperger, Thomas Hans. "Mineralogy and geochemistry of the platinum group elements (PGE), rare earth elements (REE) and scandium in nickel laterites." Doctoral thesis, Universitat de Barcelona, 2015. http://hdl.handle.net/10803/396340.

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Abstract (sommario):
Ni laterites are considered worthy targets for critical metals (CM) exploration as rare earth elements (REE), Sc and platinum group elements (PGE) can be concentrated during weathering as a result of residual and secondary enrichment. In this investigation geochemical and mineralogical data of CM from two different nickel laterite types (i) from the Moa Bay mining area in Cuba (oxide type) and (ii) from the Falcondo mining area in the Dominican Republic (hydrous Mg silicate type) are presented. Emphasis is given on examining their potential to accumulate CM and on processes involved. Results s
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5

Inguaggiato, Claudio. "Geochemistry of Zr, Hf and REE in extreme water environments : hyperacid, hypersaline and lake waters in hydrothermal systems." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066007/document.

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Cette thèse de doctorat traite du comportement géochimique de Zr, Hf et Terres Rares dans des environnements aqueux extrêmes. Les études ont été effectuées dans les eaux hyper-salines long de la faille de la Mer Morte (Israël), les eaux hyper-acides dans le système volcanique hydrothermal du Nevado del Ruiz (Colombie) et les eaux riches en CO2 du système volcanique hydrothermal de l'île de Pantelleria, en comprenant le lac alcalin “Specchio di Venere”. Haute appauvrissement en Terres Rares légères a été trouvé dans les eaux acides dominées par le sulfate où on a reconnu la formation d’alunite
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6

Inguaggiato, Claudio. "Geochemistry of Zr, Hf and REE in extreme water environments : hyperacid, hypersaline and lake waters in hydrothermal systems." Electronic Thesis or Diss., Paris 6, 2016. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2016PA066007.pdf.

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Abstract (sommario):
Cette thèse de doctorat traite du comportement géochimique de Zr, Hf et Terres Rares dans des environnements aqueux extrêmes. Les études ont été effectuées dans les eaux hyper-salines long de la faille de la Mer Morte (Israël), les eaux hyper-acides dans le système volcanique hydrothermal du Nevado del Ruiz (Colombie) et les eaux riches en CO2 du système volcanique hydrothermal de l'île de Pantelleria, en comprenant le lac alcalin “Specchio di Venere”. Haute appauvrissement en Terres Rares légères a été trouvé dans les eaux acides dominées par le sulfate où on a reconnu la formation d’alunite
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7

Baldwin, Geoffrey James. "THE STRATIGRAPHY AND GEOCHEMISTRY OF THE RAPITAN IRON FORMATION, NORTHWEST TERRITORIES AND YUKON, CANADA." Thesis, Laurentian University of Sudbury, 2014. https://zone.biblio.laurentian.ca/dspace/handle/10219/2194.

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The Neoproterozoic was a time of major change in Earth’s surficial history, including a major rise in atmospheric oxygen, the first appearance of complex metazoan life, and a series of worldwide glaciations. A particular interesting element of these so called “snowball Earth” glacial deposits is the presence of iron formation, a distinctive Precambrian rock type that is largely absent from the post-Paleoproterozoic record. Despite being relatively poorly studied with respect to their geochemistry and sedimentology, Neoproterozoic iron formations are used to support many models for the record o
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8

Vanderstraeten, Aubry. "Advances in geochemical tracing of atmospheric dust in Antarctica." Doctoral thesis, Universite Libre de Bruxelles, 2020. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/312773.

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AbstractAtmospheric dust is a major component of the Earth System. The optical properties of dust and their roles in cloud nucleation processes have a major impact on Earth’s radiative budget and hydrological cycle. Dusts also take part in many biogeochemical cycles in surface waters of the oceans and on land through their capacity to supply key micronutrients (e.g. Fe, P) sustaining primary production. The aim of this thesis is to improve the understanding of dust cycle by creating new and innovative methods allowing to trace the source regions of dust and quantify their respective contributi
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9

Tourpin, Sylvie. "Perte des mémoires isotopiques (Nd, Sr, 0) et géochimiques (REE) primaires des komatiites au cours du métamorphisme : Exemple de la Finlande Orientale." Phd thesis, Université Rennes 1, 1991. http://tel.archives-ouvertes.fr/tel-00675899.

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Les komatiites ont souvent été considérées comme reflétant directement les compositions chimiques et isotopiques de leurs sources mantelliques. Cependant, l'utilisation de ces roches pour reconstituer la composition du manteau archéen apparaît abusive du fait que les komatiites montrent toutes des recristallisations métamorphiques, ce qui laisse subsister un doute profond quant à la préservation de leurs caractéristiques primaires. La possibilité d'une modification profonde des signatures isotopiques ainsi que des autres caractéristiques chimiques (incluant des éléments réputés immobiles, tels
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10

Paquette, Jean-Louis. "Comportement des systèmes isotopiques U-Pb et Sm-Nd dans le métamorphisme éclogitique. Chaîne Hercynienne et chaîne Alpine." Phd thesis, Université Rennes 1, 1987. http://tel.archives-ouvertes.fr/tel-00675107.

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Les éclogites témoignent, pour la plupart d'entre elles, de l'existence de lambeaux de paléocroûtes océaniques affectées par des conditions tectonométamorphiques très intenses. Ces roches représentent généralement les premiers épisodes de la formation des chaînes de montagne, avant les phénomènes de collision continentale. L'étude géochronologique et géochimique des éclogites est fondamentale car elle apporte d'une part de nombreuses contraintes à la géologie des massifs cristallins étudiés, et permet d'autre part de caractériser le comportement des systèmes isotopiques \ lors d'un métamorphis
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11

Martin, Hervé. "Nature, origine et évolution d'un segment de croûte continentale archéenne : contraintes chimiques et isotopiques. Exemple de la Finlande orientale." Phd thesis, Université Rennes 1, 1985. http://tel.archives-ouvertes.fr/tel-00655973.

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Le but de ce mémoire est d'aborder le problème de la genèse et de l'évolution de la croate continentale. Le support de terrain ayant servi de base à cette étude est le socle de Finlande orientale dont l'histoire archéenne se déroule sur plus de 500 m.a. L'analyse a été menée en 4 étapes successives : a) une étude de terrain permet de caractériser les matériaux et d'établir leur chronologie relative. b) la radiochronologie (Rb-Sr) précise l'enchainement et la durée des événements géologiques. c) les différents aspects de la genèse de chaque unité lithologique sont envisagés à l'aide de la géoch
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12

Godfrey, Linda Vivien. "Temporal changes in the geochemistry of North Pacific red clays." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359812.

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13

Haider, A. "Géologie de la formation ferrifère précambrienne et du complexe granulitique encaissant de Buur (Sud de la Somalie) : Implications sur l'évolution crustale du socle de Buur." Phd thesis, Institut National Polytechnique de Lorraine - INPL, 1989. http://tel.archives-ouvertes.fr/tel-00653755.

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Le socle Précambrien du Sud de la Somalie couvre environ 28.000 km 2 . Il forme une pénéplaine située au Nord-Ouest de Mogadisho, la région de Buur. Les affleurements y sont très limités. Ils form ent des inselbergs de gneiss granitiques et le fond de quelques oueds. Environ 98% de la région est ainsi couverte de sédiments détritiques, subactuels de type "red bed". Il faut donc souligner que les données acquises dans le cadre de ce travail sont fondées sur un nombre très limité d'affleurements. Ces affleurements sont constitués 1) d'un complexe de roches méta-ignées et méta-sédimentaires affec
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14

Hardman, Tristam Samuel. "Microfabrics and geochemistry of Holcene Halimeda bank sediments, northern Great Barrier Reef, Australia." Thesis, University of East Anglia, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389393.

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15

Evans, Carol Susan. "The Geology, Geochemistry, and Alteration of Red Butte, Oregon: A Precious Metal-Bearing Paleo Hot Spring System." PDXScholar, 1986. https://pdxscholar.library.pdx.edu/open_access_etds/3444.

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Red Butte is located 60 km south of Vale, Oregon, about 20 km west of the Oregon/Idaho border. The butte is within the Owyhee Upland physiographic province of eastern Oregon which lies at the intersection of the Western Snake River Plain, the High Lava Plains, and the Northern Basin and Range provinces. The butte is composed of Miocene to Pliocene lacustrine and fluvial volcaniclastic sediments. The topography of the butte is controlled by silicification of the sandstones and mudstones which cap it. Silicification and hydrothermal alteration are both structurally and stratigraphically controll
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16

Hibbard, Shannon Maria. "Trace Element Geochemistry of Compositionally Layered Impact Spherules." Master's thesis, Temple University Libraries, 2017. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/460665.

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Geology<br>M.S.<br>Impact spherules are sand-sized spherical particles that have been interpreted to have formed by the cooling, crystallization, and quenching of melt droplets condensed from vapor plumes that are created during large meteor impacts. Spherules may be deposited globally as unique marker beds, such as at the K-Pg boundary. A minimum of 11 spherule beds have been identified in the Archean and Paleoproterozoic, and provide a record of impact events that predate any known craters. This study of 3.24 Ga impact spherules from the S3 spherule layer in the Barberton Greenstone Belt (BG
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17

Ménot, René-Pierre. "Magmatismes paléozoiques et structuration carbonifère du Massif de Belledonne (Alpes Françaises). Contraintes nouvelles pour les schémas d'évolution de la chaîne varisque ouest-européenne." Phd thesis, Université Claude Bernard - Lyon I, 1987. http://tel.archives-ouvertes.fr/tel-00656012.

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Les Massifs cristallins externes (M.C.E) des Alpes occidentales sont des témoins de l' orogène hercynien s.1., repris dans la chaine alpine. Leur place et \ leur signification dans le cadre varisque sont mal cernées. Cette méconnaissance résulte essentiellement de la rareté des données pétrologiques, géochimiques et géochronologiques disponibles. L'étude concerne la chaîne de Belledonne et plus spécialement son extré mité méridionale. Ce secteur Sud-Ouest présente en effet une lithologie et une structuration atypiques par rapport à celles du secteur Nord-Est dont les caractères sont proches .
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18

Debnath, Sudeep. "Surface/Geochemistry of Iron and Manganese Oxide Nano-Materials in the Environment." Diss., Temple University Libraries, 2009. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/30879.

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Chemistry<br>Ph.D.<br>Nanomaterials possess physical and chemical properties that may benefit medicine, catalysis, and environmental remediation. Apart from understanding the structure of nanomaterials, significant amount of research has focused on understanding the structural properties of nanoparticles that lead to their unique reactivity. Ferric hydroxides are important mineral components and the subject of much scientific research in environmental and soil sciences because of their ubiquity in soil, ground water and aquatic sediments Iron oxide nanoparticles found in the environment exhibi
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19

Emmermann, Peter. "Mineralogy, geochemistry and microfacies of late Quaternary periplatform sediments carbonate export cycles and secondary processes - Sanganeb Atoll and Abington Reef, Sudan, Central Red Sea = Mineralogie, Geochemie und Mikrofazies spätquartärer Periplattformsedimente /." [S.l. : s.n.], 2000. http://e-diss.uni-kiel.de/diss%/d364.pdf.

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20

Narwich, Charles Bryan. "Event Stratigraphy Based on Geochemical Anomalies within a Mixed-Sediment Backbarrier Sequence, Southern New Jersey." Master's thesis, Temple University Libraries, 2012. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/194335.

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Geology<br>M.S.<br>Detection of large-magnitude coastal events, especially in wave-dominated retrograding barrier settings, has traditionally relied upon lithological evidence, such as distinct overwash sand layers within the muddy backbarrier sequences. In tide-dominated environments, unconformities in marsh stratigraphy have been interpreted as rapid drowning or erosion events caused by large storms. In transitional mixed-energy backbarrier environments, however, clearly identifiable event horizons are rare, due to unfavorable conditions for peat formation or to a lack of overwash. To addres
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21

Anné, Jennifer. "HISTOLOGICAL AND GEOCHEMICAL PROPERTIES OF PATHOLOGICAL VERSUS NORMAL BONE IN ALLOSAURUS FRAGILIS AND MODERN AVIANS." Master's thesis, Temple University Libraries, 2010. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/103924.

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Geology<br>M.S.<br>In modern organisms the structure and arrangement of bone apatite crystals is dependent on the arrangement of the organic collagen fibers. This is reflected in the formation of different types of bone tissue, such as woven (immature) or lamellar (mature), in pathological versus normal bone, or fast-growing (woven) versus slow-growing (lamellar) tissue. Because the basic physiological processes of fracture healing are similar in extant vertebrates, similar patterns may exist in fossil taxa. The three questions of interest for this study were the following: 1) Do differences e
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22

Finlay, Alyssa Jean. "Dissolution Kinetics of Bioapatite from pH 2 to 8 at 4° to 38°C." Master's thesis, Temple University Libraries, 2012. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/182799.

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Geology<br>M.S.<br>Dissolution experiments were conducted on bioapatite at 4°C, 21°C and 38°C and solution pH values between 2 and 8 in a stirred tank reactor. The bioapatite was obtained from modern white-tailed deer (Odocoileus virginianus) scapulae, crushed, and cleaned in 30% hydrogen peroxide to remove organic matter. The average BET specific surface area of the 75-106 and 106-246 μm particles was 255 m2 g-1. During experiments the ratio of Ca:P released became stoichiometric at ca. 1.44. The following dissolution rate law was derived from the experimental results: R = K1(H+)ⁿ+K2 in which
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23

Klein, Trevor Isaac. "Investigating nitrate attenuation in an urban stream using stable isotope geochemistry and continuous monitoring." Master's thesis, Temple University Libraries, 2015. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/319212.

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Geology<br>M.S.<br>Urbanization affects in-stream biogeochemical processes that control nutrient export. Attempts to restore urban streams will not be successful unless the biological and physical controls on water quality are thoroughly understood. The objective of this study was to identify the relative influences of tributary dilution, groundwater discharge, and biological processing on nitrate concentrations in an urban stream during high and low flow periods. A wastewater treatment plant (WTP) on Pennypack Creek, an urban stream near Philadelphia, PA, increases nitrate concentrations to a
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24

Gangloff, Sophie. "Evaluation of the mechanisms of trace elements transport (Pb, Rare Earth Elements,... ) and the elemental and isotopic fractionation (Ca and Sr) at the interface water-soil-plant." Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAH002/document.

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Ce travail est axé sur l’étude d’un profil de sol et des solutions de sol prélevés sur une parcelle expérimentale couvertes d’épicéas. Tous ces échantillons proviennent du Bassin Versant du Strengbach (Observatoire HydroGéochimique de l’Environnement – OHGE), ont été échantillonnés à différentes profondeurs (5, 10, 30 et 60 cm) et durant la période comprise entre 2009 et 2013.Les caractérisations des extraits des sols par spectroscopie Infra-Rouge ont permis de mettre en évidence les modifications des groupements fonctionnels organiques avec la profondeur et que ces modifications ont une forte
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25

Peterson, Stephen Patrick. "THE GEOLOGIC, GEOMORPHIC, AND GEOGRAPHIC INFLUENCE ON LEAD AND OTHER HEAVY METAL CONCENTRATIONS IN THE SOILS OF FAIRMOUNT PARK, PHILADELPHIA." Master's thesis, Temple University Libraries, 2014. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/270852.

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Geology<br>M.S.<br>The city of Philadelphia is an amalgamation of extremely diverse land uses, both currently and historically, including: transportation, industrial, commercial, parks and residential areas. This urban tapestry of historical and current land use creates the potential for human exposure to heavy metals in contaminated soils. In order to evaluate this potential public health hazard, soil samples from open spaces in Philadelphia's Fairmount Park (the largest inner-city park system in the U.S.) were analyzed using a handheld x-ray fluorescence (XRF) analyzer and inductively couple
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26

Mahizhnan, Annamalai. "Red-brown hardpan: distribution, origin and exploration implications for gold in the Yilgarn Craton of Western Australia." Thesis, Curtin University, 2004. http://hdl.handle.net/20.500.11937/1732.

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Red-brown hardpan occurs extensively in Western Australia in the arid and semi-arid regions of the Murchison, Pilbara and Eastern Goldfields divisions, between longitudes 115ºE and 124ºE and latitudes 23ºs and 30ºs. It occupies an area of about 360,000 sq. km, two thirds of which occurs in the Yilgarn Craton. The purpose of this research is to map the distribution of red-brown hardpan in the Yilgarn Craton of Western Australia; study the relationship between landscape, soil texture and vegetation; investigate the physical characteristics, petrology, mineralogy, geochemistry and cementing agent
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27

Murphy, Riley Tomas. "Reactivity of Iron-Bearing Minerals Under Carbon Sequestration Conditions." Diss., Temple University Libraries, 2011. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/140596.

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Chemistry<br>Ph.D.<br>The rise in anthropogenic carbon dioxide in the atmosphere has caused the pursuit of adequate methods to alleviate the resulting strain on the world's ecosystem. A promising strategy is the geological sequestration of carbon dioxide, in which carbon dioxide emitted from large point sources is injected underground for storage. Under storage, carbon dioxide trapped as a carbonate mineral may be stable for geological time periods. Experiments were conducted to test the potential of ferric-bearing minerals to sequester carbon as a ferrous carbonate mineral (siderite). The for
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28

Banuchi, Victoria B. Beatriz. "Ultraviolet Photooxidation and O2 Chemical Oxidation of Fe2+ -Smectites and Implications for Mars." Master's thesis, Temple University Libraries, 2018. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/520832.

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Geology<br>M.S.<br>Clay minerals detected in ancient Martian terrains help constrain Mars’ climate and aqueous alteration history. Since Mars’ primordial origin, atmospheric redox conditions have evolved from reducing to oxidizing and clay minerals may record the effects of that transition. Ferrous trioctahedral smectites of varying iron content were synthesized and subjected to oxidation by O2 and by UV irradiation to address these as potential oxidizing agents. UV irradiation (112.77 hours with 450 W Hg lamp) of smectites equivalent to approximately four years of flux on the Martian surface
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Moore, Nicole E. DeBari Susan M. "Origin and geochemical evolution of mafic magmas from Mount Baker in the northern Cascade arc, Washington : probes into mantle and crustal processes /." Online version, 2010. http://content.wwu.edu/cdm4/item_viewer.php?CISOROOT=/theses&CISOPTR=345&CISOBOX=1&REC=14.

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30

Myer, Caroline Amelia. "Sedimentology, Stratigraphy, and Organic Geochemistry of the Red Pine Shale, Uinta Mountains, Utah: A Prograding Deltaic System in a Mid-Neoproterozoic Interior Seaway." DigitalCommons@USU, 2008. https://digitalcommons.usu.edu/etd/167.

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Abstract (sommario):
The Red Pine Shale (RPS; ~1120m), uppermost formation of the Neoproterozoic Uinta Mountain Group, Utah, is an organic-rich sedimentary succession that represents marine deltaic systems delivering mature sediment from the east and immature sediment from the north. Multiple data sets suggest regional climate and sea-level changes associated with changing organic carbon burial rates. Six facies identified represent wave-, tidal-, and river-influenced parts of the distal prodelta to delta front. The shale facies is interpreted as distal prodeltaic deposition in a marine environment. The concr
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31

Westfield, Isaac T. Dworkin Steve I. "Geochemical fingerprinting of sediments on the Pear Tree Bottom Reef, near Runaway Bay, Jamaica." Waco, Tex. : Baylor University, 2008. http://hdl.handle.net/2104/5289.

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32

Mahizhnan, Annamalai. "Red-brown hardpan: distribution, origin and exploration implications for gold in the Yilgarn Craton of Western Australia." Curtin University of Technology, Department of Applied Geology, 2004. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=15888.

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Abstract (sommario):
Red-brown hardpan occurs extensively in Western Australia in the arid and semi-arid regions of the Murchison, Pilbara and Eastern Goldfields divisions, between longitudes 115ºE and 124ºE and latitudes 23ºs and 30ºs. It occupies an area of about 360,000 sq. km, two thirds of which occurs in the Yilgarn Craton. The purpose of this research is to map the distribution of red-brown hardpan in the Yilgarn Craton of Western Australia; study the relationship between landscape, soil texture and vegetation; investigate the physical characteristics, petrology, mineralogy, geochemistry and cementing agent
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33

Cerkez, Elizabeth B. "Investigations of Surface Redox Chemistry on Environmentally Relevant Iron Oxides and Sulfides." Diss., Temple University Libraries, 2016. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/383744.

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Chemistry<br>Ph.D.<br>Important reactions in the environment often occur at the interface between a mineral surface and aqueous phase. Reactions occurring at this interface often control the uptake or release of harmful components resulting in the geochemical cycling of elements in the environment. Additionally, minerals are commonly used in the remediation of contaminated areas, where similar chemistry occurs at their interfaces. Thus, studies of the chemistry of these interfaces are essential to our understanding of complex environments. Many of these processes are controlled by electron tra
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34

NEMBRINI, MATTIA. "CONTROLLING FACTORS ON THE DEPOSITIONAL ARCHITECTURE OF CARBONATE SYSTEMS: SEDIMENTOLOGY, FACIES, GEOMETRY, DIAGENESIS AND GEOCHEMISTRY OF EASTERN SARDINIA JURASSIC CARBONATES." Doctoral thesis, Università degli Studi di Milano, 2021. http://hdl.handle.net/2434/829369.

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L’evoluzione temporale e spaziale delle piattaforme carbonatiche e delle biocostruzioni è controllata dall’interazione di fattori globali (clima, variazioni eustatiche), regionali (tettonica) e fattori ambientali locali (nutrienti, penetrazione della luce e profondità) che influiscono sulle variazioni dell’accomodamento e la natura delle carbonate factories. La riorganizzazione delle placche tettoniche legata all’apertura della Tetide Alpina e le variazioni climatiche hanno influenzato direttamente le successioni carbonatiche Giurassiche, le quali registrano uno dei maggiori momenti di abbonda
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35

Hausner, Douglas B. "Surface Science Investigations: Calcite Surface Reconstruction and Ferrihydrite Reactivity." Diss., Temple University Libraries, 2009. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/44342.

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Chemistry<br>Ph.D.<br>On surfaces and within interfaces occur some of the most important reactions in chemistry, from world changing industrial reactions to critical environmental processes. It is even hypothesized that the chiral nature of life arose from reactions occurring on chiral mineral surfaces. In any case adsorption typically plays a key role. Adsorption can occur on rapid time scales, particularly in catalytic systems, and it can be the precursor to highly stable surface interaction mechanisms such as surface precipitation. Surface adsorption can have a dramatic affect on the result
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36

Paulson, Benjamin D. DeBari Susan M. "Magmatic processes in the Jurassic Bonanza arc : insights from the Alberni region of Vancouver Island, Canada /." Online version, 2010. http://content.wwu.edu/cdm4/item_viewer.php?CISOROOT=/theses&CISOPTR=331&CISOBOX=1&REC=3.

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37

Lammers, Kristin D. "Carbon dioxide sequestration by mineral carbonation of iron-bearing minerals." Diss., Temple University Libraries, 2015. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/339925.

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Chemistry<br>Ph.D.<br>Carbon dioxide (CO2) is formed when fossil fuels such as oil, gas and coal are burned in power producing plants. CO2 is naturally found in the atmosphere as part of the carbon cycle, however it becomes a primary greenhouse gas when human activities disturb this natural balanced cycle by increasing levels in the atmosphere. In light of this fact, greenhouse gas mitigation strategies have garnered a lot of attention. Carbon capture, utilization and sequestration (CCUS) has emerged as a possible strategy to limit CO2 emissions into the atmosphere. The technology involves cap
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38

CHAKRABORTY, SUVANKAR. "THE GEOCHEMICAL EVOLUTION OF ALKALINE MAGMAS FROM THE CRARY MOUNTAINS, MARIE BYRD LAND, ANTARCTICA." Bowling Green State University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1174187928.

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39

Palin, Richard Mark. "Using metamorphic modelling techniques to investigate the thermal and structural evolution of the Himalayan-Karakoram-Tibetan orogen." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:f86580ad-c183-4ecd-bcbd-17f3a1b74548.

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Metamorphic rocks constitute a vast volumetric proportion of the Earth’s continental lithosphere and are invaluable recorders of the mechanisms and rates of deformation and metamorphism that occur at the micro-, meso- and macro-scale. As such, they have the potential to provide detailed insight into important tectonic processes such as the subductive transport of material into, and back from, mantle depths and also folding, faulting and thickening of crust that occurs during collisional orogeny. The Himalayan-Karakoram-Tibetan orogen is the youngest and most prominent example of a continent-co
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40

Berglund, James Lundstrom. "Karst Aquifer Recharge and Conduit Flow Dynamics From High-Resolution Monitoring and Transport Modeling in Central Pennsylvania Springs." Diss., Temple University Libraries, 2019. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/589966.

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Geoscience<br>Ph.D.<br>Karst aquifers are dynamic hydrologic systems which are sensitive to short-term recharge events (storms) and heterogeneous recharge characteristics (point recharge at sinks, irregular soil thicknesses). These aquifers are highly productive yet also vulnerable to contamination, in large part because the conduit network is a significant unknown for predicting karst flow paths. To address these uncertainties, two adjacent karst springs, Tippery Spring and Near Tippery Spring, were monitored to better understand flow and source mixing characteristics. The two springs in cent
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41

Silva, Renata Maria Goulart da. "Acúmulo de metais-traço no sedimento e em organismos da megafauna bentônica na Baía do Almirantado, Ilha Rei George, Antártica." Niterói, 2017. https://app.uff.br/riuff/handle/1/4783.

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Submitted by Biblioteca de Pós-Graduação em Geoquímica BGQ (bgq@ndc.uff.br) on 2017-10-04T15:44:46Z No. of bitstreams: 1 tese_renata_maria_completa.pdf: 1532064 bytes, checksum: db3c7a043c5eecc779b264a3e956dea2 (MD5)<br>Made available in DSpace on 2017-10-04T15:44:46Z (GMT). No. of bitstreams: 1 tese_renata_maria_completa.pdf: 1532064 bytes, checksum: db3c7a043c5eecc779b264a3e956dea2 (MD5)<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>Universidade Federal Fluminense. Instituto de Química. Programa de Pós-Graduação em Geoquímica, Niterói, RJ<br>Nos últimos anos observa-se
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42

Laubscher, Sydney. "MANGANESE UPTAKE IN RED MAPLE TREES IN RESPONSE TO MINERAL DISSOLUTION RATES IN SOIL." Kent State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=kent1574431912056187.

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43

Bostock, Helen C., and Helen Bostock@anu edu au. "Geochemically tracing the intermediate and surface waters in the Tasman Sea, southwest Pacific." The Australian National University. Faculty of Science, 2005. http://thesis.anu.edu.au./public/adt-ANU20061106.123254.

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The relatively understudied intermediate waters of the world have been implicated as an important part of the global ocean circulation. This thesis discusses the intermediate waters of the Pacific over space and time. Initially, by using geochemical tracers to look at the present distribution, sources and mixing of the water masses. Secondly, by using oxygen and carbon isotopes from sediment cores to study changes in Antarctic Intermediate Waters (AAIW) over the late Quaternary in the north Tasman Sea. The sediment cores also provide sedimentological data on the hemipelagic sedimentation in th
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44

Zheng, Xinyuan. "Oceanic cycling of rare earth elements and the application of Nd isotopes to assess changes in Mesozoic ocean circulation." Thesis, University of Oxford, 2016. http://ora.ox.ac.uk/objects/uuid:0b06129a-8f51-4421-a043-5eeb86cec972.

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Rare earth elements (REEs) and their isotopes (such as Nd isotopes) can be potentially used to trace a wide range of oceanic processes in both modern and ancient oceans, but their successful application as tracers requires a comprehensive understanding of REE cycling in the modern ocean. Previous studies of REEs in seawater were largely constrained by analytical difficulties in generating accurate and precise REE data from seawater, which typically contain REE concentrations at a sub-ppt to ppt level. A new, and relatively simple, analytical method for precise and accurate determination of all
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45

Bellefleur, Alexandre. "Cinétique de réaction et solubilité des produits de corrosion dans les conditions physico-chimiques du circuit primaire des réacteurs à eau sous pression (REP)." Phd thesis, Toulouse 3, 2012. http://thesesups.ups-tlse.fr/1767/.

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L'objectif du travail présenté est d'acquérir expérimentalement de nouvelles données thermodynamiques sur les espèces qui constituent les produits de corrosion présents dans le circuit primaire des REP. Le volet expérimental de cette étude se focalise sur deux phases solides du nickel : l'oxyde de nickel NiO (ou bunsenite) et le ferrite de nickel NiFe2O4. La vitesse de dissolution de l'oxyde de nickel a été mesurée jusqu'à 130°C en milieu acide (pH 3 à 5). Un modèle cinétique a été utilisé afin de décrire les vitesses de dissolution mesurées expérimentalement. Ce modèle a permis de déterminer
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46

Bellefleur, Alexandre. "Cinétique de réaction et solubilité des produits de corrosion dans les conditions physico-chimiques du circuit primaire des réacteurs à eau sous pression (REP)." Phd thesis, Université Paul Sabatier - Toulouse III, 2012. http://tel.archives-ouvertes.fr/tel-00767055.

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Abstract (sommario):
L'objectif du travail présenté est d'acquérir expérimentalement de nouvelles données thermodynamiques sur les espèces qui constituent les produits de corrosion présents dans le circuit primaire des REP. Le volet expérimental de cette étude se focalise sur deux phases solides du nickel : l'oxyde de nickel NiO (ou bunsenite) et le ferrite de nickel NiFe2O4. La vitesse de dissolution de l'oxyde de nickel a été mesurée jusqu'à 130°C en milieu acide (pH 3 à 5). Un modèle cinétique a été utilisé afin de décrire les vitesses de dissolution mesurées expérimentalement. Ce modèle a permis de déterminer
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47

Stepanov, Aleksandr S. "Monazite control on Th, U and REE redistribution during partial melting: experiment and application to the deeply subducted crust." Phd thesis, 2012. http://hdl.handle.net/1885/9432.

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Rare earth elements (REE), Th and U are elements with similar geochemical properties. In crustal rocks these elements are hosted by the light REE (LREE) phosphate mineral monazite. Piston-cylinder experiments were conducted to constrain monazite solubility and monazite/melt partitioning in hydrous granitic melts at conditions relevant to crustal anatexis and subduction zone melting. Monazite has strong preference for LREE and Th; REE heavier than Nd have decreasing compatibility in monazite, and U is less compatible than LREE and Th. New experimental data and reconciliation with previous studi
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48

Geer, Phillip. "Magnetite Mineralization of the Hammondville Pluton: Poly-Phase Kiruna Type IOCG Magnetite-Apatite Deposits in the Lyon Mountain Granite." 2020. https://scholarworks.umass.edu/masters_theses_2/965.

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Recent mapping of the Eagle Lake Quadrangle, NY, coupled with whole-rock geochemistry and microscopy has offered insight into the petrogenesis of the magnetite-apatite deposits of the Hammondville mining district in the eastern Adirondack Mountains. This study provides insight into the magmatic history of the ca. 1060-1050 Ma Lyon Mountain Granite (Hammondville Pluton) which is intimately related to, and hosts the deposits in this area. Magnetite seams are commonly surrounded by well layered magnetite gneiss, which typically parallel the seams, although in some outcrops appear to be slightly t
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49

Trestrail, J. L. "U-Pb detrital zircon, geochemical and Nd isotope constraints on sedimentary provenance of the Chewings Range Quartzite, Warumpi Province, Arunta Region, NT." Thesis, 2010. http://hdl.handle.net/2440/106279.

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This item is only available electronically.<br>The Chewings Range Quartzite is a meta-sedimentary cover sequence located in the Warumpi Province of the Arunta Region. U-Pb detrital Zircon analysis of the Chewings Range Quartzite indicates a minimum depositional age of ~ 1640Ma, with the main population of zircons residing within a range of 1700 – 1800Ma. Evidence from Sm-Nd isotopic data suggests that a series of Staurolite Garnet Schists, often grouped with the Chewings Range Quartzite, has a significantly more juvenile character. This suggests that it may represent a new unit with a signific
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50

Chapelle, Béatrice. "La lithosphére océanique de la Téthys ligure. Etude des magmatismes basiques et acides ( Massifs ophiolitiques du Montgenèvre et de Haute Ubaye)." Phd thesis, 1990. http://tel.archives-ouvertes.fr/tel-00536874.

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Les termes acides et basiques des massifs ophiolitiques du Montgenèvre et de Haute- Ubaye sont étudiés en parallèle dans ce travail. L'étude pétrographique (notamment l'étude typologique des zircons pour les albitites) et la géochimie des éléments majeurs confirment la nature tholéilique des magmasétudiés. L'étude du comportement des éléments traces (Zr, Y, Nb,Th, Cr, REE) permet de mettre en évidence, pour le Montgenèvre,une évolution continue des roches basiques conduisant de basaltes enrichis en LREE, situés à la base de la série, à des basaltes appauvris en LREE (N -MORB typiques) tardifs
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