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Teses / dissertações sobre o tema "Geochemistry"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 9 de junho de 2025

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1

Spivack, Arthur J. "Boron isotope geochemistry." Thesis, Massachusetts Institute of Technology, 1986. http://hdl.handle.net/1721.1/15187.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, and Woods Hole Oceanographic Institution, 1986.<br>MICROFICHE COPY AVAILABLE IN ARCHIVES AND LINDGREN<br>Vita.<br>Includes bibliographies.<br>by Arthur J. Spivack.<br>Ph.D.

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2

Thomas, Jay Bradley. "Melt Inclusion Geochemistry." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/11262.

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Silicate melt inclusions (MI) are small samples of melt that are trapped during crystal growth at magmatic pressures and temperatures. The MI represent a sample of the melt that was isolated from the magma during host crystal growth. Thus, MI provide a valuable tool for constraining the magmatic history of igneous systems because they provide an unambiguous method to directly determine compositions of melts from which the host crystal grew. As such, coupled petrographic examination and geochemical analyses of MI and host crystals can reveal information about crystal/melt processes in igneo

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3

Heri, Alexandra Regina. "Geochemistry, geochronology and isotope geochemistry of eocene dykes intruding the Ladakh batholith." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B50899624.

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Eocene dykes intruding the Ladakh batholith were sampled along the southern margin of the Trans-himalayan plutonic arc in Ladakh, NW-India. Approximately 30 dykes were encountered in the 40 km trail between Leh and Hemis Shugpachan. The dykes in the east of the field are trending E to NE and those in the west trending N to NW, exhibiting sub-parallel orientations within each area. Eighteen dykes were sampled (two of them multiple times) and subjected to petrographic, geochemical and isotopic analyses. They exhibit various degrees of differentiation from basaltic to rhyolitic compositions and

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4

Kiriakoulakis, Konstadinos. "Organic geochemistry of carbonate concretions." Thesis, University of Liverpool, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337141.

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5

Dredge, Jonathan. "Aerosol contributions to speleothem geochemistry." Thesis, University of Birmingham, 2014. http://etheses.bham.ac.uk//id/eprint/5136/.

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There is developing interest in cave aerosols due to the increasing awareness of their impacts on the cave environment and speleothems. This study presents the first multidisciplinary investigation into cave aerosols and their contribution to speleothem geochemistry. Modern monitoring of suspended aerosol concentrations, CO2 and temperature in Gough’s Cave, Cheddar Gorge have presented a strong relationship with cave ventilation processes. Temporal variations of aerosol levels have demonstrated the ability of aerosol monitoring to record seasonal ventilation shifts, beyond anthropogenic influe

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6

Wang, David Texan. "The geochemistry of methane isotopologues." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111690.

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Thesis: Ph.D. in Geochemistry, Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2017.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages 123-143).<br>This thesis documents the origin, distribution, and fate of methane and several of

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7

Gurriet, Philippe C. (Philippe Charles). "Geochemistry of Hawaiian dredged lavas." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/54327.

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8

Lamadrid, De Aguinaco Hector M. "Geochemistry of fluid-rock processes." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/71350.

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When these fluids interact with the surrounding rocks, small aliquots of these fluids are trapped as imperfections in the crystal lattice and fractures of minerals. These microscopic features are called fluid and melt inclusions, and are one of the best tools available to probe, measure and determine the chemical and physical properties of crustal fluids. In the present study we examine new developments into our understanding of fluid-rock interactions using fluid and melt inclusion as tools to provide insights into the evolution of the Earth's crust from the deep continental crust to the surf

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9

Wood, Tamara Michelle. "Numerical modeling of estuarine geochemistry /." Full text open access at:, 1993. http://content.ohsu.edu/u?/etd,240.

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10

Curtis, John B. "Evaluation of the hydrocarbon source-rock potential of carbonaceous shales : upper Devonian shales of the Appalachian basin /." Connect to resource, 1989. http://rave.ohiolink.edu/etdc/view.cgi?acc%5Fnum=osu1263906458.

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11

Lifton, Nathaniel Aaron 1963. "A new extraction technique and production rate estimate for in situ cosmogenic carbon-14 in quartz." Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/289000.

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The potential utility of in situ cosmogenic ¹⁴C (in situ ¹⁴C) in surficial process studies is widely recognized, yet a reliable means of isolating it has proved difficult to develop. Here we present a new method for isolating in situ ¹⁴C in quartz that yields more precise estimates of production rates than achieved by previously published extraction techniques. The new technique involves resistance heating of samples, and collection of all evolved carbon as CO₂ between 500°C and 1500°C. Our improved technique holds three distinct advantages over other extraction methods: (1) we can identify an

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12

Broughton, L. M. "The geochemistry of Westmin Resources Ltd." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/29918.

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Westmin Resources Ltd. operate a 3000 tpd copper-lead-zinc mine 93 km by highway south-southwest of Campbell River in Strathcona Provincial Park. The mine began operations in 1966. Tailings were initially discharged directly to the bottom of Buttle Lake; a practice which continued until an on-land tailings disposal facility was commissioned in June 1984. Testwork has indicated significant acid production potential in the sulphide tailings. Tailings are now deposited by the "subaerial" method; a procedure designed to produce an unsaturated, high density tailings mass with low horizontal and ve

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13

Williams, Lynda B. "Boron isotope geochemistry during burial diagenesis." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0022/NQ49549.pdf.

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14

Huebner, Ralf. "Sediment geochemistry : a case study approach." Thesis, Bournemouth University, 2009. http://eprints.bournemouth.ac.uk/13139/.

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The geochemistry of sediments is a very wide field and several important aspects must be taken into account, including, but not limited to, various methodological questions, the analysis of distribution patterns, determination of origins and the assessment of risks. Therefore, this research project adapted a case study approach and analysed several important aspects of contamination in sediments at a time. In case study 1, the distribution of metals in the sediments was analysed in Bigge and Olpe, two small and fast running watercourses in Germany. The metal/metalloid concentrations showed ver

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15

Baker, Richard Graham Alex. "The geochemistry and cosmochemistry of thallium." Thesis, Imperial College London, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.506042.

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16

Rice-Birchall, B. "Petrology and geochemistry of basic volcanics." Thesis, Keele University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314570.

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17

Woodhouse, Oliver Brian. "Osmium in seawater : analysis and geochemistry." Thesis, University of Southampton, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284676.

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18

Hartland, Adam. "Colloidal geochemistry of speleothem-forming groundwaters." Thesis, University of Birmingham, 2011. http://etheses.bham.ac.uk//id/eprint/1659/.

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Natural aquatic colloids (solids with dimensions between 1 nm and 1 micron) were studied in cave waters that feed secondary carbonates [speleothems]. Results show that during hydrologically quiescent periods, trace metal (Tr) binding (e.g. Cu, Ni, Co) is dominated by humic-like, natural organic matter (NOM), with the smallest NOM-Tr complexes (≤1 to ca. 4 nm diameter) being the least labile at high pH (>pH 10). Partitioning of NOM:Tr between solution and crystal occurs minimally for the strongest complexes, providing a measure of NOM adsorption. Rapid fluxes of coarse (>100 nm) soil organic ma

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19

Gamil, Ali Saif. "Petrology and geochemistry of Shetland granites." Thesis, University of Liverpool, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316890.

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This study is concerned with the distribution, age, chemistry and geotectonic setting of the 21 granites in Shetland. The granites range in size from a few metres to 8 Km across and in age from Pre-Moine to early Carboniferous. The granites occupy a unique position in being placed approximately half way between Scotland and Norway Caledonides and about 320 Km east of southeast coast of Greenland, if Greenland is restored to its pre-continental Drift position as predicted by the best fit of Greenland and Europe. The Shetland granites have been subdivided into 5 groups according to their locatio

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20

Davison, Nigel. "The geochemistry of radioactive waste disposal." Thesis, Aston University, 1987. http://publications.aston.ac.uk/9698/.

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The present study attempted to identify the significant parameters which affect radionuclide migration from a low level radioactive waste disposal site located in a clay deposit. From initial sorption studies on smectite minerals, increased Kd with decreasing initial cation concentration was observed, and three sorption mechanisms were identified. The observation of anion dependent sorption was related to the existence of a mechanism in which an anion-cation pair are bound to the clay surface through the anion. The influence of competing cations, typical of inorganic groundwater constituents,

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21

Hobson, Andrew James. "Geochemistry of vanadium in hyperalkaline environments." Thesis, University of Leeds, 2017. http://etheses.whiterose.ac.uk/20280/.

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Hyperalkaline environments associated with leaching of industrial wastes such as steel slags can have a number of deleterious effects on their local environment including rapid carbonate precipitation and mobilisation of potentially toxic trace metals. Steel slag is the primary byproduct of steelmaking and is enriched in trace elements such as Al, Cr and V. V is of particular concern due to its high concentration in steel slag, its potential toxicity and its mobility in high pH leachate as the vanadate oxyanion (VO43-). This study used aerated and air-excluded batch leaching tests, aerated lea

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22

Harraway, Trevor John. "Chemical characterisation of landfill leachate and its potential mobility through the Cape Flats sand." Thesis, University of Cape Town, 1996. http://hdl.handle.net/11427/26218.

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23

Jindra, Sarah A. "Hydrothermal Atomic Force Microscopy Investigation of Barite Growth: The Role of Spectator Ions in Elementary Step Edge Growth Kinetics and Hillock Morphology." Wright State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=wright1503503972572962.

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24

Pasilis, Sofie Portia. "Effect of citric acid on uranyl(VI) solution speciation, gas-phase chemistry and surface interactions with alumina." Diss., The University of Arizona, 2004. http://hdl.handle.net/10150/280730.

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Activities related to nuclear weapons production have left a legacy of uranium contamination in the United States. Understanding the chemical interactions that uranium undergoes in the environment is important for prediction of uranium mobility and development of remediation strategies. A detailed spectroscopic examination of the pH-dependent behavior of the UO₂²⁺-citrate system in aqueous solution was completed using Raman, ATR-FTIR, and NMR spectroscopies, combined with ESI-MS. Three structurally-distinct UO₂²⁺-citrate complexes, {(UO₂)₂Cit2}²⁻, {(UO₂)₃Cit₃}³⁻, and (UO₂)₃Cit₂ exist in dynami

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25

Jung, Daniel Yong Chu. "Ab initio studies in high pressure geochemistry /." Zürich : ETH, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17730.

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26

Piatak, Nadine. "Geochemistry of Nettle Creek, Champaign County, Ohio /." Connect to resource, 1998. http://hdl.handle.net/1811/28568.

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27

Sandison, Carolyn Maree. "The organic geochemistry of marine-influenced coals /." Full text available, 2001. http://adt.curtin.edu.au/theses/available/adt-WCU20030702.111035.

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28

Bury, Sarah J. "The geochemistry of North Atlantic ferromanganese encrustacions." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334120.

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29

Langford, Emma. "Microbial geochemistry of a lead-zinc mine." Thesis, University of Nottingham, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.594771.

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Frongoch is a disused Pb-Zn mine situated approximately 16 km SE of Aberystwyth in central Wales. Despite being disused for over 100 years, the site is leaching heavy metals (Zn and Pb) into the Nant Cwmnewydion and ultimately Ystwyth rivers. The prevalence of heavy metal salts in the River Ystwyth was first reported by Carpenter in 1924 but remains a problem today. In 2002, the Environment Agency released a report ranking Frongoch in the top 50 mine sites impacting surface waters, and in 2010 work commenced to remediate the site. The British Geological Survey (BGS) and Environment Agency have

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30

Rock, Gregory John. "The iron geochemistry of mudstones and metapelites." Thesis, University of Newcastle Upon Tyne, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399001.

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31

Warren, Edward Arthur. "Geochemistry of authigenic mineral sequences in sandstones." Thesis, University of Sheffield, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267897.

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32

Hill, Alan Frederick Mark. "The sulphur geochemistry of Jurassic source rocks." Thesis, University of Aberdeen, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283752.

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In immature Jurassic shales of differing depositional environment from Great Britain (Ro<0.5) the C<sub>32</sub> hopane and C<sub>29</sub> sterane isomerisation provide an accurate indication of relative maturities. For mature Viking Graben samples (Ro>0.7) a reliable indication of relative maturity is gained if Tmax, Ts(Ts+Tm), C<sub>29</sub>ββ/(ββ+αα) steranes and the Triaromatic Index are considered together. The most reliable parameters for the determination of depositional redox are pristane/phytane and the C<sub>35</sub>/C<sub>34</sub> homohopane ratio, together with the concentrations o

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33

James, Doreen Elizabeth. "The geochemistry of feldspar-free volcanic rocks." Thesis, Open University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.295080.

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34

Maginn, Ellis. "Biomineralisation and geochemistry of hydrothermal vent fauna." Thesis, University of Southampton, 2002. https://eprints.soton.ac.uk/426772/.

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Hydrothermal ventfauna, particularly vestimentiferan and polychaete worm tubes, are occasionally preserved in the geological record. The early stages of mineralisation are particularly important in defining whether or not preservation will occur, and they are poorly understood. This dissertation describes 3 separate studies of ventfauna undergoing early mineralisation associated with active seafloor vent systems. Tube samples of the polychaete worm Alvinella pompejana collected from 13°N on the East Pacific Rise were studied to identify the processes occurring during early sulphide mineralisat

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35

Ghani, Azman Abdul. "Petrology and geochemistry of Donegal granites Ireland." Thesis, University of Liverpool, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243112.

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36

Pekka, Larisa. "Geochemistry of the Kola River, northwestern Russia." Licentiate thesis, Luleå tekniska universitet, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-25751.

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The Kola River in the northern part of the Kola Peninsula, northwestern Russia, flows into the Barents Sea via the Kola Bay. The river is vital for the reproduction of salmon and an important source of drinking water for more than 500,000 people in Murmansk and the surrounding municipalities. To evaluate the environmental status of the Kola River water, extensive sampling of water (the dissolved (ƒ¬0.22 ƒÝm) and suspended (ƒ®0.22 ƒÝm) phases) and aquatic mosses (Fontinalis spp.) was performed on thirteen sites along the Kola River and its tributaries during 2001 and 2002. Major (Ca, K, Mg, Na,

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37

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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38

Williamson, Mark Allen. "Thermodynamic and kinetic studies of sulfur geochemistry." Diss., Virginia Tech, 1992. http://hdl.handle.net/10919/38485.

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39

Miller, Sarah Jane. "Geochemistry of ferruginous clogging of Karoo wells." Master's thesis, University of Cape Town, 2000. http://hdl.handle.net/11427/4213.

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Summary in English.<br>Includes bibliographical references.<br>The main source of potable water in the Karoo is groundwater and thus any problems resulting from the abstraction of water or from diffifulties in abstractions of water are important. The iron clogging of screens, pumps and filter packs in supply wells is a worldwide problem and the consequences can be severe, leading to costly and harsh rehabilitation measures or even loss of the well. A study was undertaken in order to determine the chemistry and morphology of the precipitates found in relation to the water chemistry, in several

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40

Morford, Jennifer Lynn. "The geochemistry of redox-sensitive trace metals /." Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/8508.

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41

Wilson, George B. "Isotope geochemistry and denitrification processes in groundwaters." Thesis, University of Bath, 1986. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370156.

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42

Sandison, Carolyn M. "The organic geochemistry of marine-influenced coals." Thesis, Curtin University, 2001. http://hdl.handle.net/20.500.11937/2193.

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The importance of organic sulphur fixation in the preservation of organic matter in humic coal-forming environments is demonstrated in this thesis. The transgression of coal depositional systems by marine waters during their deposition and early diagenesis enables the production of reduced inorganic sulphur species by sulphate-reducing bacteria. The presence of these reactive sulphur species, in combination with the altered chemical and microbial regime, influences the preservation and petroleum potential of humic coal.Three lignite samples taken over a two meter depth profile of a core in the

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43

Sandison, Carolyn M. "The organic geochemistry of marine-influenced coals." Curtin University of Technology, School of Applied Chemistry, 2001. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=12911.

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The importance of organic sulphur fixation in the preservation of organic matter in humic coal-forming environments is demonstrated in this thesis. The transgression of coal depositional systems by marine waters during their deposition and early diagenesis enables the production of reduced inorganic sulphur species by sulphate-reducing bacteria. The presence of these reactive sulphur species, in combination with the altered chemical and microbial regime, influences the preservation and petroleum potential of humic coal.Three lignite samples taken over a two meter depth profile of a core in the

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44

Subroto, Eddy Ariyono. "30-NOR-17 [alpha] (H) - hopanes and their applications in petroleum geochemistry." Thesis, Curtin University, 1990. http://hdl.handle.net/20.500.11937/421.

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A suite of samples consisting of twenty-two crude oils and eight sedimentary rocks has been analysed for biological marker compounds by GC-MS. The sedimentary rocks are rich in carbonate minerals and the crude oils were reported to have been derived from carbonate source rocks. These samples are from a variety of geographical origins, geological ages and depositional environments. They consistently contain a homologous series of 30-nor-17 [alpha] (H)-hopanes. Seven homologues (C28 - C34) of the 30-nor-17 [alpha](H)-hopane series have been identified. These compounds appear to be useful biologi

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45

Brown, Erik Thorson. "The geochemistry of beryllium isotopes : applications in geochronometry." Thesis, Woods Hole, Mass. : Woods Hole Oceanographic Institution, 1990. http://catalog.hathitrust.org/api/volumes/oclc/23283464.html.

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46

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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47

Tijhuis, Laurentius. "The Geochemistry of the Topsoil in Oslo, Norway." Doctoral thesis, Norwegian University of Science and Technology, Department of Geology and Mineral Resources Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-164.

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<p>In co-operation with the Geological Survey of Norway, 395 samples of topsoil, 44 bedrock samples and 24 samples of sand from sandboxes at kindergartens taken in Oslo, the capital city of Norway, were analysed for a wide range of elements. To get a measure on the bio-availability of arsenic, a five stage sequential extraction procedure was accomplished on a subset of 98 topsoil samples and on all 24 samples of sand from sandboxes. These fractions (i.e. “Exchangeable”, “Carbonate”, “Reducible substrate”, “Organic” and “Residual”) were analysed for arsenic. Bulk concentrations in a representat

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48

Hales, Philip. "Inorganic geochemistry of tropical lake and swamp sediments." Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357524.

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49

Sumon, Mahmud Hossain. "Geochemistry of arsenic in Bengal Basin wetland sediments." Thesis, University of Aberdeen, 2011. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=168311.

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Over the last decades, arsenic (As) contamination of soil-plant-water systems has become a major concern for Bangladesh and West Bengal, India. The geochemistry of the sediment depositional environment which subsequently, on sediment burial, give rise to elevated As in Holocene groundwater’s of Southeast Asia, may provide clues to unravelling the mechanistic basis and spatial heterogeneity of this phenomenon. The Sundarbans mangrove ecosystem, Bangladesh, is a modern analogue, and indeed forms a continuum with, the Holocene sediments of concern and thus studying As cycling in surface Sundarban

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50

Eady, Angela Elizabeth. "The petrology and geochemistry of the Acheron intrusion." Thesis, University of Canterbury. Geology, 1995. http://hdl.handle.net/10092/6783.

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Subalkaline transitional gabbros have intruded the Cretaceous - Paleocene sediments of the Acheron Outlier. The gabbroic magma has differentiated in situ to form a laccolith and sill-like apophysis, as well as having a strong thermal effect on the sediments and especially the coals of the Broken River Formation. This research concentrates on the geochemical characteristics and differentiation processes. Additional research on the thermal alteration of the coals at Acheron has provided data for heating models of the sediments. Thermal alteration of the sediments is extensive with the thermal a

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