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Dissertations / Theses on the topic 'Sulfur isotopes'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 June 2024

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1

Pruett, Lee. "Stable Sulfur Isotope Rations from West Antarctica and the Tien Shan Mountains: Sulfur Cycle Characteristics from Two Environmentally Distinct Areas." Fogler Library, University of Maine, 2003. http://www.library.umaine.edu/theses/pdf/PruettL2003.pdf.

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2

Cousineau, Mélanie L. "Tracing Biogeochemical Processes Using Sulfur Stable Isotopes: Two Novel Applications." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/23714.

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Abstract Dissimilatory microbial sulfate reduction (MSR) The specific objectives of the study were to provide the first measurements of sulfur isotope fractionation associated with acidophilic sulfate reducing-microorganisms, and to examine whether pH influences sulfur fractionation during MSR. The fractionation associated with the strains investigated was comparable to that of neutrophilic strains with similar metabolisms (4-12‰), but varied with pH. Two fractionation regimes were identified: one regime is consistent with fractionation during exponential growth, while the other – not identifi

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3

Meyer, Amanda Lynn. "Biogeochemistry of Sulfur Isotopes in Crystal Lake, Clark County, West-Central Ohio." Wright State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=wright1420911116.

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4

Leavitt, William Davie. "On the mechanisms of sulfur isotope fractionation during microbial sulfate reduction." Thesis, Harvard University, 2014. http://dissertations.umi.com/gsas.harvard:11511.

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Underlying all applications of sulfur isotope analyses is our understanding of isotope systematics. This dissertation tests some fundamental assumptions and assertions, drawn from equilibrium theory and a diverse body of empirical work on biochemical kinetics, as applied to the multiple sulfur isotope systematics of microbial sulfate reduction. I take a reductionist approach, both in the questions addressed and experimental approaches employed. This allows for a mechanistic, physically consistent interpretation of geological and biological sulfur isotope records. The goal of my work here i

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5

Jamieson, John William. "Tracing sulfur sources in an Archean hydrothermal system using sulfur multiple isotopes a case study from the Kidd Creek volcanogenic massive sulfide deposit /." College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/2697.

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Thesis (M.S.) -- University of Maryland, College Park, 2005<br>Thesis research directed by: Geology. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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6

Edwards, Cole T. "Carbon, sulfur, and strontium isotope stratigraphy of the Lower-Middle Ordovician, Great Basin, USA: Implications for oxygenation and causes of global biodiversification." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1405797089.

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7

Friedman, Carrie T. 1972. "Analysis of stable sulfur isotopes and trace cobalt on sulfides from the TAG hydrothermal mound." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/53034.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1998.<br>Includes bibliographical references (leaves 86-90).<br>by Carrie T. Friedman.<br>M.S.

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8

Sparks, Janine M. "Characterizing Spatial Patterns for Natural and Anthropogenic Atmospheric Sulfur in Terrestrial Biological Systems." University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1527606422395088.

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9

Rennie, Victoria Christian Frances. "Carbonate associated sulfate as a proxy for the isotopic composition of Cenozoic seawater sulfate." Thesis, University of Cambridge, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708258.

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10

Howard, Bret Harmon. "The hydrodesulfurization of thiophene by Mo/Co treated oxyaluminum pillared montimorillonites." Diss., This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-07122007-103926/.

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11

BONILLA, ALEJANDRA. "GEOCHEMISTRY OF ARSENIC AND SULFUR IN SOUTHWEST OHIO: BEDROCK, OUTWASH DEPOSITS AND GROUNDWATER." University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1132088950.

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12

Kitayama, Yumi. "Les quatre isotopes du soufre dans les kimberlites de Sibérie, traceurs du recyclage de croûte océanique et de sédiments Archéens dans le manteau terrestre." Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0244.

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Héritées de l’atmosphère primitive, des anomalies dans les abondances relatives des isotopes du soufre (32S, 33S, 34S et 36S) sont enregistrées dans les sédiments terrestres d’il y a plus de 2,5 milliards d’années (i.e. archéens). Nous évaluons ici la robustesse des isotopes du soufre à tracer le recyclage précoce de croûte océanique et de sédiments, transférés dans le manteau profond ou stockés dans le manteau lithosphérique depuis la mise en place de la subduction. En Sibérie, le manteau lithosphérique a été naturellement échantillonné par l’éruption de la kimberlite d’Udachnaya-Est. Extrême

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13

Kitayama, Yumi. "Les quatre isotopes du soufre dans les kimberlites de Sibérie, traceurs du recyclage de croûte océanique et de sédiments Archéens dans le manteau terrestre." Electronic Thesis or Diss., Université de Lorraine, 2018. http://www.theses.fr/2018LORR0244.

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Héritées de l’atmosphère primitive, des anomalies dans les abondances relatives des isotopes du soufre (32S, 33S, 34S et 36S) sont enregistrées dans les sédiments terrestres d’il y a plus de 2,5 milliards d’années (i.e. archéens). Nous évaluons ici la robustesse des isotopes du soufre à tracer le recyclage précoce de croûte océanique et de sédiments, transférés dans le manteau profond ou stockés dans le manteau lithosphérique depuis la mise en place de la subduction. En Sibérie, le manteau lithosphérique a été naturellement échantillonné par l’éruption de la kimberlite d’Udachnaya-Est. Extrême

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14

Lang, James Robert 1961. "A GEOCHEMICAL STUDY OF ALTERATION AND MINERALIZATION IN THE WALLAPAI MINING DISTRICT, MOHAVE COUNTY, ARIZONA (MINERAL PARK, FLUID INCLUSIONS, SULFUR ISOTOPES)." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/275536.

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15

Zamotaeva, Valeriya. "High-resolution FTIR spectra analysis of sulfur dioxide isotopologues." Thesis, Bourgogne Franche-Comté, 2019. http://www.theses.fr/2019UBFCK053.

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Dans cette thèse, nous avons examiné les propriétés spectrales de l’anhydride sulfureux. Les spectres FTIR expérimentaux de nombreux isotopologues du dioxyde de soufre, 32S16O2, 34S16O2, 32S18O2 et 32S16O18O, ont été enregistrés pour la première fois dans les régions des bandes fondamentales, «chaudes», harmoniques et de combinaison. La grande variabilité des conditions expérimentales a permis d’observer et d’identifier pour la première fois des transitions appartenant aux ban¬des ro-vibrationnelles suivantes : 3v2, 3v2 - v2, 2v2 - v2 bandes de 32S16O2 ; 2v2 - v2 bande de 34S16O2 ; v1 + v2, v2

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16

Thibon, Fanny. "Chimie des océans au Paléoprotérozoïque." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEN008/document.

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Les conditions oxydantes de la surface terrestre actuelle sont dues à la teneur élevée en dioxygène de l’atmosphère. Au début de l’histoire de la Terre il y a 4.54 milliards d'années (Ga), l’oxygène n’était pas stable dans l’atmosphère. Il a fallu deux épisodes d’augmentation brutale de ce gaz atmosphérique pour qu’il atteigne son niveau actuel : l’un vers 2.4 Ga, nommé le Grand Evènement Oxydant (GOE) qui fait l’objet de ce projet, l’autre 2 milliards d’années plus tard, nommé l’Evènement Oxydant Néo-protérozoïque (NOE). Le GOE est vraisemblablement le résultat de l’émersion généralisée de la

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17

Foley, Derek J. "Analysis of the Point Pleasant/Lexington/Trenton Formations: Sulfides, Mineralogy, and Trace Elements as Geochemical Proxies." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1461333436.

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18

Diekrup, David. "Depositional Pathways and the Post-Depositional History of the Neoarchean Algoma-Type BIF in Temagami, ON." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39875.

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Algoma-type banded iron formation is common in Neoarchean greenstone belts, and many of its distinctive features such as the banding of iron-rich and silica-rich material and deposition in volcanic terranes have been ascribed to their deposition related to volcanic-hydrothermal activity and cyclic variability in depositional pathways. The work presented in this thesis tests these assumptions and presents a model for the deposition and post-depositional processes now represented by the petrography and geochemistry of a 2.73 Ga type-locality of Algoma-type BIF in Temagami, ON. Adsorption of comp

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19

Reed, Alan Thomas. "Decay studies of neutron-rich nuclei." Thesis, University of Liverpool, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367175.

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20

Cendón, Sevilla Dionisio Ignacio. "Evolución geoquímica de cuencas evaporíticas terciarias: implicaciones en la composición isotópica disuelto en el océano durante el terciario." Doctoral thesis, Universitat de Barcelona, 1999. http://hdl.handle.net/10803/81705.

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Esta memoria trata de la evolución geoquímica de cuencas evaporíticas terciarias y de su utilidad en la reconstrucción de la evolución isotópica (delta(34)S y delta(18)O) del sulfato disuelto en el océano durante el Terciario. Para ello se ha dividido el texto en tres partes principales: Parte 1. Se tratan los aspectos metodológicos y se describen las técnicas empleadas. El microanálisis de inclusiones fluidas mediante Cryo-SEM-EDS, permite el análisis cuantitativo de los solutos en inclusiones fluidas congeladas de tamaños de hasta 15 delta m. Los electrolitos analizados son los componente

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21

Ullrich, Maria K. [Verfasser], and Britta [Akademischer Betreuer] Planer-Friedrich. "Preservation and analysis of sulfur isotopes in thioarsenates : New methods for the investigation of abiotic and biotic transformation processes / Maria K. Ullrich ; Betreuer: Britta Planer-Friedrich." Bayreuth : Universität Bayreuth, 2017. http://d-nb.info/1143013964/34.

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22

Pasquier, Virgil. "Climate and sea level variations in the Gulf of Lion : coupling stable and radiogenic isotopes proxies." Thesis, Brest, 2017. http://www.theses.fr/2017BRES0094/document.

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De par sa position, le Golfe du Lion est un site idéal pour l’investigation des changements paléo-environnementaux et des processus affectant le dépôt sédimentaire. Les travaux antérieurs ont permis de mettre en évidence les impacts de la variabilité climatique et glacioeustatique sur l’organisation stratigraphique de la marge, mais également sur les exports terrestres de matière organique.L’étude isotopique du carbone organique et de l’azote de la matière organique dans les sédiments du forage PRGL1-4 nous a permis de mettre en évidence de forts exports fluviaux lors des interstades survenus

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23

Whitehill, Andrew (Andrew Richard). "Mass-independent sulfur isotope fractionation during photochemistry of sulfur dioxide." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/97334.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2015.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 161-175).<br>Mass-independent sulfur isotope signatures are observed in Archean and early Paleoproterozoic sedimentary sulfate and sulfide minerals, and provide the most robust constraints on early atmospheric oxygen levels. Smaller mass-independent sulfur isotope anomalies are observed in ice cores and interpreted as a tracer of stratospheric volcanic loading. Photochemistry of sulfur dioxi

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24

El, Kilany Aïda. "Hydrologie et cycles biogéochimiques du soufre dans deux bassins marginaux de Méditerranée pendant la Crise de Salinité Messinienne." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCC107/document.

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La formation du gypse (CaSO4.2H2O) dans les bassins marginaux méditerranéens au cours du Messinien est contrôlée par la restriction des bassins et par le cycle hydrologique local. La compétition entre l’évaporation et l’apport d’eau douce par les rivières, en association avec des échanges limites avec la Méditerranée, ont permis la mise en place de conditions chimiques favorables à la formation du gypse. La restriction des bassins entraine, de plus, l’augmentation de la consommation de l’oxygène par les microorganismes, l’anoxie, et la mise en place d’un cycle biogéochimique actif du soufre. A

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25

Nannan, He. "Compound-specific Sulfur Isotope Study of Petroleum." Thesis, Curtin University, 2020. http://hdl.handle.net/20.500.11937/80115.

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This PhD project progressed petroleum applications of compound specific sulfur isotope analysis. Standard compounds and high S petroleum samples were studied. New discoveries included an enrichment effect on the ?34S values of organic sulfur compounds during petroleum biodegradation; and preservation of the ?34S of organic sulfur compounds in the asphaltene fraction of oils impacted by thermochemical sulfate reduction. Field studies helped identify the source inputs of mixed oils and S-availability during deposition.

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26

Gälman, Veronika. "Varved lake sediments and diagenetic processes." Doctoral thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-5724.

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Varved (annually laminated) sediments are of great interest for inference of past environmental conditions, as they provide dated records with high time resolution. After deposition, the sediment varves are affected by diagenesis; i.e., chemical, physical and biological changes that occur within the sediment. An important premise when reconstructing past environmental conditions using lake sediments is that the signal of interest is preserved in the sediment. In this thesis I have used a unique collection of ten stored freeze cores of varved lake sediment from Nylandssjön in northern Sweden, c

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27

Fiege, Adrian [Verfasser]. "Sulfur and sulfur isotope distribution between fluids and silicate melts : an experimental investigation / Adrian Fiege." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover (TIB), 2013. http://d-nb.info/1043725067/34.

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28

Unal, Ezgi. "Genetic Investigation And Comparison Of Kartaldag And Madendag Epithermal Gold Mineralization In Canakkale-region, Turkey." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612369/index.pdf.

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This thesis study is concerned with the genetic investigation of two epithermal gold deposits (Madendag and Kartaldag) in &Ccedil<br>anakkale, NW Turkey. The methodology comprises field and integrated laboratory studies including mineralogic-petrographic, geochemical, isotopic, and fluid inclusion analysis. Kartaldag deposit, hosted by dacite porphyry, is a typical vein deposit associated with four main alteration types: i) propylitic, ii) quartz-kaolin, iii) quartz-alunitepyrophyllite, iv) silicification, the latter being characterized by two distinct quartz generations as early (vuggy) an

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29

Deloule, Etienne. "Analyses isotopiques à l'échelle intra-cristalline : une contribution à l'étude des systèmes géologiques." Vandoeuvre-les-Nancy, INPL, 1991. http://docnum.univ-lorraine.fr/public/INPL_T_1991_DELOULE_E.pdf.

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La composition isotopique du Plomb a été mesurée sur des lessivages progressifs des minéraux de sulfures des gisements métallifères de la ceinture archéenne de l'Abitibi (Québec). La signature isotopique des gisements en milieu sédimentaire montre que les métaux proviennent d'une croute continentale antérieure à la ceinture de roches vertes, âgée de 2,7 milliards d'années. Les minéralisations associées au volcanisme résultent d'un mélange entre cette source crustale et une source mantellique. L'analyse isotopique à la sonde ionique du plomb et du soufre des galènes de Tristate et du Viburnum t

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30

Sim, Min Sub. "Physiology of multiple sulfur isotope fractionation during microbial sulfate reduction." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/77788.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>Microbial sulfate reduction (MSR) utilizes sulfate as an electron acceptor and produces sulfide that is depleted in heavy isotopes of sulfur relative to starting sulfate. The fractionation of S-isotopes is commonly used to trace the biogeochemical cycling of sulfur in nature, but a mechanistic understanding of factors that control the range of isotope fractionation is still lacking. This thesis inv

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31

Hodkiewicz, Paul. "The interplay between physical and chemical processes in the formation of world-class orogenic gold deposits in the Eastern Goldfields Province, Western Australia." University of Western Australia. Centre for Global Metallogeny, 2003. http://theses.library.uwa.edu.au/adt-WU2004.0057.

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[Formulae and special characters can only be approximated here. Please see the pdf version of the abstract for an accurate reproduction.] The formation of world-class Archean orogenic gold deposits in the Eastern Goldfields Province of Western Australia was the result of a critical combination of physical and chemical processes that modified a single and widespread ore-fluid along fluid pathways and at the sites of gold deposition. Increased gold endowment in these deposits is associated with efficient regional-scale fluid focusing mechanisms and the influence of multiple ore-depositional pr

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32

Johnston, David T. "Sulfur isotope fractionations in biological systems insight into the Proterozoic biosphere /." College Park, Md. : University of Maryland, 2007. http://hdl.handle.net/1903/6714.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2007.<br>Thesis research directed by: Geology. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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33

Sharman, Elizabeth. "Application of multiple sulfur isotope analysis to Archean ore-forming processes." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=104747.

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Identification of sulfur sources in an ore-forming system is important as it provides a greater understanding of how a mineral deposit forms and how best to explore for that particular type of deposit. It can also aid in the understanding of the ocean and atmosphere chemistry at the time of formation. Mass independent sulfur isotope fractionation in the Archean atmosphere provides a fingerprint for identifying non-magmatic sources of sulfur. This makes sulfur multiple isotope measurements a powerful tool for deconvolving ore-forming processes in the Archean. This thesis presents three applicat

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34

Fuentes, A. Fernandez. "FTIR determination of sulphur isotope ratios." Thesis, University of Aberdeen, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334712.

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A new method for the determination of sulphur isotopic ratios by FTIR measuring the area or absorbance of individual lines, has been developed. The project could be divided into three parts: (i) In part one the infrared spectra of four sulphur gases SCO, H<sub>2</sub>S, SF<sub>6</sub> and SO<sub>2</sub>, were collected and studied to evaluate which one would be the most appropriate to determine sulphur isotopic ratios. The synthesis of these gases was also assessed and performed in those cases where the means to carry them out were available. This part was designed to test the viability of the

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35

Díaz, Ramos Rut Amélia. "Geoquímica inorgânica, orgânica e isotópica do enxofre em sedimentos holocênicos do sistema de ressurgência de Cabo Frio (RJ)." Niterói, 2017. https://app.uff.br/riuff/handle/1/3816.

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Submitted by Biblioteca de Pós-Graduação em Geoquímica BGQ (bgq@ndc.uff.br) on 2017-06-07T18:11:24Z No. of bitstreams: 1 Tese Rut Díaz.pdf: 2159528 bytes, checksum: 159d73b33fae80ff4ee36bea4366ea74 (MD5)<br>Made available in DSpace on 2017-06-07T18:11:24Z (GMT). No. of bitstreams: 1 Tese Rut Díaz.pdf: 2159528 bytes, checksum: 159d73b33fae80ff4ee36bea4366ea74 (MD5)<br>Fundação de Amparo a Pesquisa do Rio de Janeiro<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Petrobras/CENPES<br>Agência Nacional do Petróleo<br>Universidade Federal Fluminense. Instituto de Química. Programa

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Allen, Linda Mathilda 1965. "Boron and Sulfur Isotopic Fractionation in the Coal Combustion System." Thesis, The University of Arizona, 1992. http://hdl.handle.net/10150/192073.

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The boron and sulfur isotopic ratios of four coal samples and corresponding fly ash leachates provide explanations for boron and sulfur incorporation into coal and behavior during combustion. Fractionation processes occur during coal formation and during the combustion of coal as some of the boron and sulfur is concentrated on the ash, and some escapes into the atmosphere as flue gas. Water-soluble boron in coal is extracted using a modified soil technique. Boron is isolated from solution using Amberlite IRA-743 resin and concentrated by methyl borate distillation with no isotopic fractionatio

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37

Gill, Benjamin Charles. "High-resolution sulfur isotope records of the Paleozoic and a detailed geochemical study of the late Cambrian SPICE event utilizing sulfur isotope stratigraphy, metal chemistry and numerial modeling." Diss., UC access only, 2009. http://proquest.umi.com/pqdweb?index=78&did=1871861801&SrchMode=1&sid=1&Fmt=7&retrieveGroup=0&VType=PQD&VInst=PROD&RQT=309&VName=PQD&TS=1270232379&clientId=48051.

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38

Wieser, Michael Eugene. "Stable isotope ratio mass spectrometry of nanogram quantities of boron and sulfur." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0012/NQ31081.pdf.

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39

DeYoung, Susan. "A sulfur isotope study of granitic plutons in the Great Basin, Western USA : implications for magma-crust interaction and crustal architecture /." abstract and full text PDF (UNR users only), 2007. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1446793.

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Thesis (M.S.)--University of Nevada, Reno, 2007.<br>"May, 2007." Includes bibliographical references (leaves 76-81). Library also has microfilm. Ann Arbor, Mich. : ProQuest Information and Learning Company, [2008]. 1 microfilm reel ; 35 mm. Online version available on the World Wide Web.

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40

Harris, Eliza [Verfasser]. "Using sulfur isotope fractionation to understand the atmospheric oxidation of SO 2 / Eliza Harris." Mainz : Universitätsbibliothek Mainz, 2012. http://d-nb.info/1024640310/34.

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41

Shen, Bing. "Contributions to the Neoproterozoic Geobiology." Diss., Virginia Tech, 2007. http://hdl.handle.net/10919/29979.

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This thesis makes several contributions to improve our understanding of the Neoproterozoic Paleobiology. In chapter 1, a comprehensive quantitative analysis of the Ediacara fossils indicates that the oldest Ediacara assemblageâ the Avalon assemblageâ already encompassed the full range of Ediacara morphospace. A comparable morphospace range was occupied by the subsequent White Sea and Nama assemblages, although it was populated differently. In contrast, taxonomic richness increased in the White Sea assemblage and declined in the Nama assemblage. The Avalon morphospace expansion mirrors the Ca

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42

McArdle, Nicola Clare. "The use of stable sulphur isotopes to distinguish between natural and anthropogenic sulphur in the atmosphere." Thesis, University of East Anglia, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335422.

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Thomas, Cyril. "Etude de la dissociation du dihydrogène et du sulfure de dihydrogène sur catalyseurs d'hydrotraitement par échange isotopique (1H-2H)." Poitiers, 1997. http://www.theses.fr/1997POIT2284.

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L'hydrotraitement est un procede du raffinage du petrole qui s'opere sous forte pression d'h#2 et ne presence d'h#2s. Le but principal de ce procede est d'eliminer les heteroatomes comme le soufre (hydrodesulfuration : hds) et l'azote (hydrodesazotation : hdn) des coupes petrolieres. L'objectif principal de l'etude est de determiner le mode de dissociation du dihydrogene sur les catalyseurs d'hydrotraitement a base de sulfures de metaux supportes. Les reactions d'echange isotopique h-d entre h#2 et d#2, h#2s et d#2 et enfin h#2 et d#2s sont realisees a 80c sous une pression totale de deux atmo

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44

Ogliore, Ryan Christopher Stone Edward Stone Edward. "The sulfur, argon, and calcium isotopic composition of the galactic cosmic ray source /." Diss., Pasadena, Calif. : California Institute of Technology, 2007. http://resolver.caltech.edu/CaltechETD:etd-02082007-175902.

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Young, Steven E. "Crystal chemical control on intra-structural copper isotope fractionation in natural copper-iron-sulfur minerals." Diss., The University of Arizona, 2003. http://hdl.handle.net/10150/289914.

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The nature of Cu isotope fractionation in natural Cu-Fe-S minerals was investigated through acid ferric sulfate leaching of copper ore from Morenci, Arizona. Copper isotope composition of the derived solutions varies from δ⁶⁵Cu = 0.47‰ to 5.21‰ over the course of progressive copper extraction. High δ⁶⁵Cu values characterize solutions collected in the first half of the leach, while the solutions collected between 35% and 45% copper recovery exhibit lower δ⁶⁵Cu values. This general pattern was observed for both bacterially-mediated and abiotic leaching. Sulfate solutions derived from dissolving

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FURUSAWA, HELIO A. "Razão isotópica de enxofre em material atmosférico por ICPMS de alta resolução." reponame:Repositório Institucional do IPEN, 1999. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11632.

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Made available in DSpace on 2014-10-09T12:54:07Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:09:24Z (GMT). No. of bitstreams: 1 12435.pdf: 4820144 bytes, checksum: 0d8279d9b23571886f63adee62a8b6f4 (MD5)<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Quimica, Universidade de Sao Paulo - IQ/USP

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Fike, David Andrew. "Carbon and sulfur isotopic constraints on Ediacaran biogeochemical processes, Huqf supergroups, Sultanate of Oman." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/42278.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, September 2007.<br>"August 2007."<br>Includes bibliographical references.<br>The link between environmental and evolutionary change is investigated in the Ediacaran Period (- 635 - 541 million years ago (Ma), an interval where we see the emergence of macroscopic animals along with large perturbations to the carbon and sulfur cycles. Paleoenvironmental reconstruction used the carbon and sulfur isotopic composition of sedimentary minerals and organic matter, supplemented by geochemical an

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Graham, Kathleen. "An experimental study of sulphur isotope fractionation during magmatic degassing." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66980.

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The sulphur isotopic evolution of basaltic melts degassed under disequilibrium conditions was investigated experimentally at temperatures of 1225 oC and oxygen fugacities between 0.5 and 1.9 log10 units above that defined by the Ni-NiO buffer. Melts were equilibrated at a pressure of 550 MPa in a piston-cylinder apparatus and degassed at ~490 to 0 MPa. Water concentrations in the experimental glasses varied from 1.5-10 wt %. Extents of degassing were quantified by comparing sulphur concentrations in the experimentally degassed (DG) glasses to those in isobarically quenched (I

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Feast, Nicholas A. "Application of nitrogen and sulphur isotope hydrochemistry in groundwater studies." Thesis, University of East Anglia, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309939.

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John, Eleanor Heulwen. "Strontium and sulphur isotopes and the origin of Mid-Late Palaeozoic mass extinctions." Thesis, University of Leeds, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.493302.

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This project focuses on two Palaeozoic mass extinction events: the Frasnian-Famennian crisis of the Late Devonian and the end-Guadalupian event of the Permian for which similar extinction mechanisms have been proposed. These have been evaluated by examining the nature of the Sr and S isotopic systems during these intervals. Proposed extinction mechanisms for the Late Devonian event include extraterrestrial impacts, rapid sea-level fluctuations, climate change eutrophication and the spread of anoxia in bottom waters. Many models invoke changes in nutrient fluxes related to proposed increases in

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