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Dissertations / Theses on the topic 'Stable isotopes geochemistry'

Author: Grafiati

Published: 25 May 2024

Last updated: 31 July 2025

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1

Valdes, Maria. "Geochemistry and Cosmochemistry of Calcium Stable Isotopes." Doctoral thesis, Universite Libre de Bruxelles, 2018. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/276866.

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Calcium (Ca) is the fifth most abundant element in the rocky planets. As a lithophile, refractory element, Ca does not partition into planetary cores nor is it volatilized during planetary accretion. These characteristics make Ca ideal for investigating the earliest stages of planetary formation and the subsequent chemical evolution of planetary mantles and crusts. This thesis presents observations of and explores the mechanisms involved in high-temperature mass-dependent Ca isotope fractionation in terrestrial, lunar, and meteoritic material. Chapter 1 reports Ca isotope fractionation among a

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2

Gilmour, Iain. "The distribution of carbon stable isotopes within sedimentary organic matter." Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373660.

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3

Morisset, Natalie Carleton University Dissertation Geology. "Stableisotope and radioisotope geochemistry of the Panda Hill carbonatite, Tanzania." Ottawa, 1992.

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4

Engström, Emma. "Fractionation of the stable silicon isotopes : analytical method developments and selected applications in geochemistry." Licentiate thesis, Luleå tekniska universitet, Geovetenskap och miljöteknik, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-18719.

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During the last few decades, variations in the 'natural' isotopic abundances of stable elements (termed 'fractionation') have received considerable interest from the scientific community. Though analytical methods and techniques for the measurement of isotopic abundances with adequate figures of merit have been available for light elements (e.g. B, C, N and O) for some time, and the wealth of data produced has secured maturity status for such applications, relatively modest progress in fractionation studies devoted to high-mass elements has been made until recently, mainly because of constrain

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5

Kelly, Jennifer Christine. "The fluid evolution of the Mount Mica and Irish Pit pegmatites, Maine| Evidence from stable isotopes." California State University, Long Beach, 2013.

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6

Negonga, Lisias. "Geochemistry, stable isotopes and fluid inclusion studies of the Otjikoto gold deposit, Central Namibia." Master's thesis, University of Cape Town, 2018. http://hdl.handle.net/11427/29190.

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The Otjikoto gold deposit is located within the Damara Orogenic Belt which is part of the system of Pan-African mobile belts. The Damara Belt is a northwest trending orogenic belt which formed through sequences of spreading, rifting, subduction and from continental collision between the Congo, Kalahari and Rio Delta Plata Cratons between 900 Ma and 450 Ma. Mineralisation at Otjikoto is hosted by a group of metamorphic rocks which consist of biotite schists from the Okonguarri Formation, albitites from the Oberwasser member and marble units from the Okawayo member. The gold mineralization occur

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Gall, Louise. "Development and application of nickel stable isotopes as a new geochemical tracer." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:ebe3c3e1-0b1b-49ed-b64a-016c8d76f220.

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In this thesis, I have developed a new methodology for the accurate determination of mass-dependent variations in nickel (Ni) isotope compositions. Nickel is initially separated in a three-column ion-exchange procedure, and the purified solutions are analysed by multi-collector inductively coupled plasma mass spectrometry (MCICPMS) using a double-spike technique. Using this methodology, I have measured the first Ni isotope ratios for a wide variety of natural geological samples. Significant Ni isotope variations were observed, with an overall spread in delta 60Ni-values of -0.9 to 2.5 permil.

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8

Brown, Elizabeth Ann. "Taxonomy and Geochemistry of the Globigerinoides ruber-elongatus Plexus, with Paleontological Implications." Scholar Commons, 2011. https://scholarcommons.usf.edu/etd/7479.

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The reliability of foraminifera as stratigraphic index fossils, and as isotopic proxies of marine environments, is based on the assumption that the fossil concepts represent uniform species, responding consistently to their ambient environments. Understanding sources of uncertainty is, therefore, critical. In this dissertation, I explore a potential bias in the application of planktonic foraminifera utilized extensively for Cenozoic paleo-reconstruction and, to a lesser extent, biostratigraphy: the Globigerinoides ruber-elongatus plexus (‘plexus’ meaning a complex network of interconnected mem

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9

Saquet, Michelle. "Greenhouse gas flux and budget from an experimentally flooded wetland using stable isotopes and geochemistry." Thesis, University of Waterloo, 2003. http://hdl.handle.net/10012/1249.

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A boreal forest wetland (L979) was flooded in 1993 at the Experimental Lakes Area, Ontario to imitate a hydroelectric reservoir and to study the effects of flooding on greenhouse gas production and emission. Flooding initially caused CO₂ and CH4 emission rates to increase and changed the wetland from a small, natural carbon sink to a large source of carbon. The increased production of greenhouse gases in the peatland also caused the majority of the peat to float to the surface creating floating peat islands, within 4 years of flooding. The floating peat islands are a larger sour

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10

Freimuth, Erika Jacob. "Advancing Leaf Wax Paleohydrology: From Plant Source to Sediment Sink." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535381306803793.

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11

Engström, Emma. "Fractionation of the stable silicon isotopes studied using MC-ICP-MS : analytical method developments and applications in geochemistry /." Luleå : Department of Chemical Engineering and Geosciences, Division of Geosciences, Luleå University of Technology, 2009. http://pure.ltu.se/ws/fbspretrieve/3522867.

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12

Diaz, Melisa A. "Geochemistry of soils from the Shackleton Glacier region, Antarctica, and implications for glacial history, salt dynamics, and biogeography." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1595542667761355.

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13

Sutcliffe, Nadine C. "Strontium stable isotope behaviour accompanying melting and magmatism in the Earth-Moon system." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:826ae843-3115-4a3e-975a-f6306f923d4e.

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This thesis concerns the application of a new technique for measuring the stable isotopes of Sr, specifically pertaining to mass dependent fractionation in high temperature processes on the Earth and Moon. Processes such as mantle melting and differentiation on Earth and the formation of the Lunar Magma Ocean are investigated by the application of a double-spike TIMS method to terrestrial and lunar material to obtain high-precision <sup>87</sup>Sr/<sup>86</sup>Sr, <sup>88</sup>Sr/<sup>86</sup>Sr and <sup>84</sup>Sr/<sup>86</sup>Sr data. Measurements of mantle-derived mafic material provide ins

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14

Stevenson, Emily Isabel. "Stable strontium isotope fractionation in marine and terrestrial environments." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:a2d97fc7-3e9d-484a-8026-11c118fcc3fd.

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The work reported in this thesis applies a new isotope tracer, stable strontium isotopes (δ<sup>88/86</sup>Sr), to address questions concerning changes in global climate that occur in response to continental weathering processes, and to constrain the modern marine geochemical Sr cycle. Stable Sr isotopes are a relatively new geochemical proxy, and as such their behavior needs to be understood in differing forms of marine calcium carbonate, the archives from which records of past stable Sr variability in the oceans can be constructed. Foraminifera, coccoliths and corals (both aragonite an

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15

Faure-Brac, Mathieu. "Effects of thermophysiology on the evolution of Pseudosuchia (Archosauria) : contributions of paleohistology and isotopic geochemistry using phylogenetic comparative methods." Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS233.

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Il est aujourd’hui communément admis que les archosaures sont ancestralement endothermes, soit qu’ils présentent des mécanismes de thermogenèse non frissonnante. Parmi les archosaures, les crocodiliens actuels sont pourtant des ectothermes, mais présentent des caractéristiques anatomiques et moléculaires traditionnellement associées à l’endothermie : un cœur à quatre cavité ; plusieurs acquisitions liées à une respiration efficace, comme un muscle diaphragmatique et un flux d’air unidirectionnel ; la formation de tissus osseux liés à des taux de croissance élevés ; un taux d’évolution mitochon

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Katz, David Allen. "Early and Late Diagenetic Processes of Mississippian Carbonates, Northern U.S. Rockies." Scholarly Repository, 2008. http://scholarlyrepository.miami.edu/oa_dissertations/154.

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Integrated sequence stratigraphy and geochemistry has significantly improved our knowledge of the formation and distribution of early and late diagenetic products in North American Mississippian carbonates. Deposition of the Madison Limestone occurred in concert with a major perturbation to the global C-pool, the timing of which was constrained by comparing secular variations in the delta13C values from the Madison Limestone with limited biostratigraphy. These early constraints were then improved by peak matching of 87Sr/86Sr values from this study with European brachiopod 87Sr/86Sr. The se

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17

Armytage, Rosalind M. G. "The silicon isotopic composition of inner Solar System materials." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:9034aab2-aadd-4dcb-b3e3-64d4d7c2f029.

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This study uses high precision silicon isotopic measurements to understand events that occurred during the earliest stages of formation of the terrestrial planets. The isotopic compositions of diverse materials such as chondrites, lunar rocks and asteroidal basalts can shed light on the homogeneity of the solar nebula, metal-silicate differentiation on planetary bodies, and terrestrial moon formation. Limited variation in the Si isotopic composition of meteorites is evidence for a relatively homogeneous inner solar system with respect to silicon isotopes. The Si isotopic composition of bulk si

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18

Rosenberg, Angela D. "Insight from the Depths of the Straits of Florida: Assessing the Utility of Atlantic Deep-water Coral Geochemical Proxy Techniques." Scholarly Repository, 2011. http://scholarlyrepository.miami.edu/oa_theses/244.

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This thesis addresses the utility of deep-water coral geochemistry and its potential to reconstruct oceanographic conditions in the Straits of Florida. Through stable isotope and elemental analyses of the carbonate skeletons and use of available geochemical proxy calibration equations, present and past environmental parameters were determined. Over the last several years, scientific expeditions to the bottom of the Straits of Florida have revealed hundreds of deep-water coral mounds and led to the collection of extensive oceanographic data, sediment samples, and deep-water coral specimens. I

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19

Deegan, Frances M. "Processes of Magma-crust Interaction : Insights from Geochemistry and Experimental Petrology." Doctoral thesis, Uppsala universitet, Berggrundsgeologi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-132702.

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This work focuses on crustal interaction in magmatic systems, drawing on experimental petrology and elemental and isotope geochemistry. Various magma-chamber processes such as magma-mixing, fractional crystallisation and magma-crust interaction are explored throughout the papers comprising the thesis. Emphasis is placed on gaining insights into the extent of crustal contamination in ocean island magmas from the Canary Islands and the processes of magma-crust interaction observed both in nature and in experiments. This research underscores that the compositions of ocean island magmas, even prim

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20

Frogley, Michael Reginald. "The biostratigraphy, palaeoecology and geochemistry of a long lacustrine sequence from NW Greece." Thesis, University of Cambridge, 1998. https://www.repository.cam.ac.uk/handle/1810/244307.

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Examination of an important new 319m core of lake sediment recovered from Ioannina in NW Greece has attempted to relate changes in the lake to variations in the regional climate of south-central Europe over the last 600,000 years. The site is known to have been extremely sensitive to past climatic change for three reasons: (i) temperate vegetation persisted throughout glacial stages (albeit at low frequencies), so the vegetational response to climatic change would therefore have been almost immediate; (ii) the extreme thickness of the sediments suggests that accumulation rates were high (at ti

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21

Brown, Bryce Matthew. "Ancient Maya Agricultural Resources in the Rio Amarillo Valley near Copán, Honduras." BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/6121.

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The purpose of this study was to use soil physical and chemical analyses to better understand the ancient agricultural landscape around the ancient Maya cities of Rio Amarillo and Piedras Negras, two tributary sites to Copan, Honduras. Our primary objective was to determine whether a mass erosion event around 800 A.D. occurred which could have caused crop failure and famine or if stable soil conditions persisted during the collapse of these city-states. Stable carbon isotope analysis of the humin fraction of the soils showed that much of this valley was used anciently for agriculture, includin

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22

Ulmer, Austin Michael. "Indications of Ancient Maya Soil Resource Management in Northern Belize." BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/5603.

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The objective of this study was to use soil chemical properties, particularly carbon isotopes to describe the agricultural landscape in the Blue Creek region on the Rio Bravo Escarpment in northwestern Belize. The primary question associated with this study focused on the comparative agricultural potential of the soils between the upland karst environment and the lowland coastal plains using the distribution and frequency of ancient Maya maize production. Soil physical features, such as clay concentrations throughout profiles in conjunction with soil chemical properties were used to aid in det

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23

Widanagamage, Inoka Hasanthi. "STABLE STRONTIUM ISOTOPE FRACTIONATION IN ABIOTIC AND MICROBIALLY MEDIATED BARITE IN MODERN CONTINENTAL SETTINGS." Kent State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=kent1445344122.

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24

MARCHINA, Chiara. "Geochemical and isotopic investigation on the Po river waters from Monviso sources to its Delta: natural and anthropogenic components." Doctoral thesis, Università degli studi di Ferrara, 2015. http://hdl.handle.net/11392/2389012.

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25

Trevis, Isaac Andrew. "Assessing and Tracking Nitrate Contamination from a Point Source and the Effects on the Groundwater Systems in Mid Canterbury, New Zealand." Thesis, University of Canterbury. Department of Geological Sciences, 2012. http://hdl.handle.net/10092/7603.

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Water is a valuable and crucial resource, the protection of which poses environmental, social and economic challenges. Fundamental to the sustainable use of water is effective management. In the Canterbury region of New Zealand, nitrate contamination has become a resource management issue due to changes in land use and intensification, which have placed pressure on the region’s groundwater and surface water systems. The purpose of this study was to assess and track nitrate concentrations on the Central Canterbury Plains with specific emphasis on a local point source of nitrate, the Ashburton

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26

Woodruff, Olivia P. "TEMPORAL AND SPATIAL CHARACTERIZATION OF MACONDO 252 SIGNATURES IN GULF OF MEXICO SHELF AND SLOPE SEDIMENTS." UKnowledge, 2014. http://uknowledge.uky.edu/ees_etds/17.

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The long-term fate of hydrocarbons in the Gulf of Mexico (GOMx) following the 2010 Deepwater Horizon oil spill has yet to be fully characterized. Elemental (% C and % N), stable isotopes (δ13Corganic), and polycyclic aromatic hydrocarbon (PAH) molecular signatures were investigated in shelf and slope sediments collected in October 2010 and 2011 to gain insight into processes affecting the distribution and fate of spilled Macondo oil. Particulate organic carbon (POC) ranged between 1.55 and 2.22 wt. % in 2010 and 0.55 and 2.06 % in 2011 while the corresponding δ13Corganic ranges were from -23.3

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Howell, Brett Andrew. "Spring Responses to Storms and Seasonal Variations in Recharge in the Middle Atlas Region of Morocco." UKnowledge, 2016. http://uknowledge.uky.edu/ees_etds/41.

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Springs in the Middle Atlas Mountains of Morocco are significant sources for public water supply. From March 2014 to May 2015, water temperatures were measured hourly at three springs (Ribaa, Sidi Rached, and Zerouka); water levels were measured hourly at Sidi Rached and Zerouka; and daily turbidity data were obtained from Ribaa. From March 2014 to March 2015, daily water samples were taken at Zerouka for analyses of the stable isotopes deuterium and oxygen-18. Hourly weather data (precipitation and air temperature) were available from March 2014 to May 2015 from Ifrane, near Zerouka. Temperat

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28

Larsen, Zachary S. "Thin Soils and Sacbes: The Soil Resources of Uci, Yucatan, Mexico." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3505.

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The objective of this study was to use pedological evidence in conjunction with Geographic Information Systems, and soil physical and chemical analyses as means to better understand the agricultural landscape surrounding the ancient Maya city of Uci. Specifically, the query of this thesis is to determine whether there is an association between settlement density and soil resources, and what relationship if any there is between the ancient sacbe of Uci and its surrounding agricultural potential. Stable carbon isotope analysis of the humin fraction of the soil organic matter was conducted on sev

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Al-Qattan, Nasser M. E. N. A. A. "Interpretation of Oxygen Isotopic Values (d18O) of North American Land Snails." Miami University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=miami1404460805.

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30

Galvão, Paulo Henrique Ferreira. "Modelo hidrogeológico conceitual de Sete Lagoas (MG) e implicações associadas ao desenvolvimento urbano em regiões cársticas." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/44/44138/tde-22092015-151113/.

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Esta pesquisa integrou estudos geológicos, hidrogeológicos, geoquímicos e de isótopos estáveis no município de Sete Lagoas (MG), Brasil, com o objetivo de entender a circulação da água em terreno cárstico e propor alternativas para o seu melhor uso, a fim de se evitar problemas geotécnicos. A área é constituída por calcários neoproterozoicos da Formação Sete Lagoas, onde se desenvolveram condutos cársticos, dando origem ao aquífero homônimo, o qual está coberto por sedimentos cenozoicos inconsolidados e, ocasionalmente, por rochas metasedimentares neoproterozoicas da Formação Serra de

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31

Pons, Marie-Laure. "La Terre à l'Archéen. Apport des isotopes de métaux de transition (Zn, Fe)." Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2011. http://tel.archives-ouvertes.fr/tel-00682665.

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L'Archéen, de 4 à 2,5 Ga, est la période qui a connu les plus grands bouleversements géologiques et biologiques de l'histoire de la Terre : formation des continents, transition d'une tectonique à composante verticale vers une tectonique des plaques horizontale, apparition de la vie, ... Le but de cette thèse est d'étudier les conditions environnementales de la Terre à l'Archéen, par l'analyse des compositions isotopiques de métaux de transition (Fe, Zn) de roches provenant principalement de la province d'Isua au Groenland (3,8 Ga). Après avoir adapté le protocole de séparation du Fe, Cu, Zn à

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32

Rashtchi, Ramina. "Assessing Aquitard Integrity: the Newmarket Till (Southern Ontario)." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/40439.

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The Newmarket Till is a regional aquitard in southern Ontario that overlies the Illinoian to Middle Wisconsinan Lower Sediments and is overlain by the Oak Ridges Moraine (ORM). Geological investigations have mapped the distribution of the till and it is understood that erosional channels, subsequently infilled with fluvial material, breach the till and may create enhanced hydraulic connection between overlying and underlying aquifers. However, little is known about the protective capability of the Newmarket Till where it is intact. This study used natural tracers to assess the extent of transp

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33

Guéguen, Bleuenn. "Apport de la géochimie isotopique du Nickel à l'étude des dépôts métallifères océaniques." Thesis, Brest, 2013. http://www.theses.fr/2013BRES0089/document.

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Les explorations scientifiques menées depuis une quarantaine d’années ont permis d'identifier la diversité et la complexité des processus géologiques et géochimiques conduisant à la concentration des métaux dans les grands fonds océaniques. Les dépôts métallifères riches en hydroxydes de Fer et de Manganèse, tels que les encroûtements hydrogénétiques et hydrothermaux et les nodules polymétalliques, présentent des enrichissements variés en éléments d'intérêts économiques tels que le Ni, Cu, Co, Te, Pt et les Terres Rares. Bien que la minéralogie et la géochimie de ces dépôts aient été largement

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34

Leslie, Deborah L. "The Application of Stable Isotopes, δ¹¹B, δ¹⁸O, and δD, in Geochemical and Hydrological Investigations". The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1386000037.

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Moore, Myles Thomas. "Noble Gas and Hydrocarbon Geochemistry of Coalbed Methane Fields from the Illinois Basin." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1462561493.

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36

Wogsland, Brittan Valhalla. "Organomineralization of Microbialites from Storr’s Lake, San Salvador Island, Bahamas: Calcium Stable Isotope Analysis using TIMS and a ⁴²Ca-⁴³Ca double spike." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587723502946554.

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37

Maslen, Ercin. "Evaluating the source, age, thermal history and palaeoenvironments of deposition of Australian and Western Canadian petroleum systems: compound specific stable isotopes coupled with inorganic trace elements." Thesis, Curtin University, 2010. http://hdl.handle.net/20.500.11937/1098.

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Petroleum geochemistry is an important scientific discipline used in the exploration and production of hydrocarbons. Petroleum geochemistry involves the applications of organic geochemistry to the study of origin, formation, migration, accumulation and alteration of hydrocarbons.Key concepts and applications of petroleum geochemistry include understanding the petroleum systems, biomarkers and stable isotopes for oil‐oil and oil‐source rock correlations and controls on secondary processes (e.g. biodegradation, water‐washing and migration‐contamination) altering the composition and usually the q

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38

Nitzsche, Kai. "Applying isotope geochemistry to identify mechanisms regulating the aquatic-terrestrial carbon and nitrogen dynamics across scales in a moraine landscape." Doctoral thesis, Humboldt-Universität zu Berlin, Lebenswissenschaftliche Fakultät, 2017. http://dx.doi.org/10.18452/17793.

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In dieser Studie wurden stabile Isotopenverhältnisse genutzt um die Mechanismen der aquatisch-terrestrischen C – und N-Dynamiken über verschiedene Skalenebenen hinweg in der Moränenlandschaft von Nordostdeutschland zu identifizieren; einer Landschaft, die stark landwirtschaftlich genutzt wird und in der es eine Vielzahl von kleinen Wasserkörpern (Sölle) gibt. Auf der regionalen Landschaftsskala spiegeln d13C-Isotopenkarten des org. Materials in Oberböden und von Pflanzenblättern eines 38.2 km2 großen Gebietes den Eintrag von org. Material von C3-Pflanzen, deren Wassernutzungseffizienz im org.

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Lotero, Lozano Laura. "The Role of High-Elevation Headwater Runoff in Streamflow Generation and Water Supply in the Northern Andes, Colombia." Scholar Commons, 2017. https://scholarcommons.usf.edu/etd/7421.

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Water security requires that sufficient quantities of water be available at critical times. This is particularly challenging for high-intensity urban and agricultural settings. In underdeveloped nations, streamflow is commonly the preferred water source, as it is readily available and delivered cost-free to users. Yet, the sources of these critical streamflows are often unknown. This issue is salient in the Northern Andes, where basic knowledge of controlling factors for the quantity, quality, and timing of runoff is lacking. High-elevation headwaters are the primary catchm

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Garbelli, C. "BIOMINERALIZATION AND GLOBAL CHANGES: BRACHIOPOD SHELLS AS ARCHIVES OF THE END PERMIAN EVENTS." Doctoral thesis, Università degli Studi di Milano, 2015. http://hdl.handle.net/2434/265524.

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The Permian has been the theatre of major global changes in the Earth’s geodynamics, climate, seawater and atmosphere geochemistry, and thus it represents an interesting case study to understand the response of organisms to environmental changes, a topic which is of increasing interest to the scientific community, who has to face the current global change. In fact, in the Permian the biotic response was dramatic, culminating at the end of the period with the greatest mass extinction of the Phanerozoic. Noteworthy, the end Permian mass extinction coincided with one of the largest known continen

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Wombacher, Frank. "The stable isotope geochemistry and cosmochemistry of cadmium." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=967287685.

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42

Nonell, Anthony. "Géochimie élémentaire et isotopique du Zn, du Sr et du Pb dans les gaz volcaniques : méthodologies d'échantillonnage et apports à la compréhension des interactions fluides/solides." Phd thesis, Université Paul Sabatier - Toulouse III, 2005. http://tel.archives-ouvertes.fr/tel-00011689.

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Ce manuscrit présente les premiers résultats d'études élémentaires et isotopiques du Zn, du Sr et du Pb, réalisées dans les principaux types d'échantillons liés aux gaz volcaniques (gaz, sublimés, eaux thermales, roches), ainsi que deux nouvelles méthodologies d'échantillonnage des émanations volcaniques. Les variations isotopiques du Zn observées au Merapi suggèrent que les processus de changement de phase (fluides/solides) peuvent provoquer des fractionnements isotopiques significatifs des éléments trace métalliques. L'étude couplée Sr/Pb réalisée à Vulcano indique que les compositions en él

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Thomas, Katherine S. S. M. Massachusetts Institute of Technology. "Organic geochemistry and stable isotope constraints on Precambrian biogeochemical processes." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/69474.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2011.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 91-101).<br>Details of the biogeochemical cycles and the dominant mechanisms present in Precambrian remain heavily debated topics. The events of the Late Proterozoic onset to glaciations and what types of early life existed in the Archean are two of the many provoking topics within the Precambrian. We set out to improve the understanding of these geologic intervals by examining stable isotopic signat

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Permana, Donaldi Sukma. "Reconstruction of Tropical Pacific Climate Variability from Papua Ice Cores, Indonesia." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1449155469.

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Khademi-Moghari, Hossein. "Stable isotope geochemistry, mineralogy, and microscopy of gypsiferous soils from central Iran." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq23945.pdf.

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Dong, Shuofei. "Stable (Cu, Zn) and radiogenic (Pb) isotope geochemistry of airborne particulate matter." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/10746.

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The aim of the thesis was to test the isotope systematics of Cu, Zn and Pb in atmospheric particulate matter and potential source material in order to critically discuss its implications and applications to studies of global biogeochemical cycles and anthropogenic impact. Four specific objectives were addressed: First, we tailored existing analytical methods to enable for the first time accurate and precise Cu and Zn isotope ratio measurements in dust and aerosol samples with low element content. Second, we studied the Pb, Cu and Zn isotope composition in aerosols collected in London to test t

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Faure, Kevin. "A stable isotope study of the Kaap Valley Tonalite, Barberton Mountain Land, South Africa." Master's thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/15849.

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Bibliography: pages 100-109.<br>The Kaap Valley Tonalite (KVT) was a homogenous hornblende+ biotite tonalite that had been subjected to overail propylitic and potassic alteration. Petrographic studies reveal that carbonate alteration and increased proportions of hydrous minerals occur along the KVT and Barberton greenstone belt contact zone, and along major shear zones within the KVT.

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Peel, Kate Elizabeth. "Studies into the Stable Isotope Geochemistry of Copper and Zinc in Aquatic Systems." Thesis, Imperial College London, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.503795.

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Hopley, Philip J. "Palaeoenvironmental reconstruction of South African hominin-bearing cave deposits using stable isotope geochemistry." Thesis, University of Liverpool, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402265.

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Scott, Gillian Anne. "Contemporary ecology and stable isotope geochemistry of benthic foraminiferids in the Celtic Sea." Thesis, Bangor University, 1998. https://research.bangor.ac.uk/portal/en/theses/contemporary-ecology-and-stable-isotope-geochemistry-of-benthic-foraminiferids-in-the-celtic-sea(ed14ac68-ce51-4156-8420-773fee552fb7).html.

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The primary aim of this thesis was to assess the value of foraminifera in downcore studies of shelfsea stratification using both assemblage and geochemical characteristics. An examination of the modern distribution of foraminifera in the context of stratification in the Celtic Sea and comparison of these distributions with measured environmental variables was undertaken to this end. In addition, several species were examined for their stable oxygen and carbon isotopic composition with reference to the ambient bottom and porewaters. Cruises were run to the Celtic Sea in July, 1995 and July-Augu

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