Дисертації з теми "Ore geochemistry"
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Lundkvist, Anders. "The process water geochemistry of the Kiirunavaara magnetite ore." Licentiate thesis, Luleå tekniska universitet, 1998. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26157.
Повний текст джерелаUnger, Derick Lee Saunders James A. Hames W. "Geochronology and geochemistry of Mid-Miocene Bonanza low-sulfidation epithermal ores of the northern Great Basin, USA." Auburn, Ala, 2008. http://repo.lib.auburn.edu/EtdRoot/2008/SPRING/Geology_and_Geography/Thesis/Unger_Derick_6.pdf.
Повний текст джерелаTanner, Dominique. "In situ mineral geochemistry as a guide to ore-forming processes." Phd thesis, Canberra, ACT : The Australian National University, 2014. http://hdl.handle.net/1885/125140.
Повний текст джерелаSharman, 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.
Повний текст джерелаL'identification des sources de soufre dans la minéralisation est importante car elle permet de comprendre les processus et de définir la meilleure méthode d'exploration. Elle peut aussi aider à la compréhension de la chimie des océans et de l'atmosphère lors de sa formation. Le fractionnement indépendant de la masse des isotopes du soufre dans l'atmosphère de l'Archéen fournit une emprunte unique permettant d'identifier les sources de soufre non magmatiques. La nature chimique conservatrice des signatures du Δ33S en fait un outil puissant pour la déconvolution des processus minéralisateurs Archéen.Cette thèse présente trois applications de l'analyse multiple des isotopes du soufre dans l'investigation des processus de minéralisation à l'Archéen. La première étude teste les modèles de formation des sulfures massifs volcanogènes (SMV) Néo- et Mésoarchéen récemment proposés ne requérant peu ou pas d'apport de sulfate marin par rapport aux systèmes SMV du Phanérozoïque et contemporains où le sulfate marin joue un rôle important. Ces modèles sont réévalués en utilisant le camp de Noranda (~2.7 Ga), sous-province de l'Abitibi, et en combinant l'utilisation de données provenant de l'analyse des isotopes du soufre et des éléments traces.Les sulfures analysés pour cette étude ont des valeurs de δ34SV-CDT entre -14.90 et +2.49 ‰, et des valeurs de Δ33SV-CDT entre -0.59 et -0.03 ‰. Selon notre interprétation, les valeurs négatives de Δ33S sont dues à l'incorporation de soufre provenant de l'eau de mer. La proportion de soufre marin aurait augmenté durant l'affaissement et l'évolution subséquente de la caldera de Noranda. Des concentrations plus élevées de Se combinées à des valeurs près de 0 ‰ et d'un haut ratio Fe/(Fe + Zn) dans les sphalérites indiquent une température de formation élevée.La deuxième étude est une investigation des sources de soufre ayant contribuées à la formation des SMV riches en Cu et en Au du camp minier Doyon-Bousquet-LaRonde (DBL; ~2.7 Ga), aussi dans la sous-province de l'Abitibi. Une source magmatique-hydrothermale de fluides minéralisateurs importante était l'interprétation donnée pour ce sous-groupe. À l'exception d'une lentille mineure, l'analyse isotopique multiple des dépôts du camp minier DBL indiquent clairement une affinité ignée-magmatique (Δ33SV-CDT = 0.14 to +0.04 ‰), avec peu ou pas de contribution de soufre provenant de la surface. Par contre, les sulfures formés sur le plancher océanique ou près de celui-ci exhibe une contribution distinctive des sulfates marins (Δ33SV-CDT = 1.43 to 0.34 ‰). D'un autre côté, l'absence de variation des valeurs du Δ33S entre des lentilles minéralisées avec une altération alumineuse et celles ne démontrant pas cette altération remet en question les l'identification des dépôts de type SMV ayant une contribution importante ou dominante de fluides magmatiques. La dernière étude examine les sources de soufre du Platreef – horizon riche en éléments du groupe platine (EGP) du flanc nord du Complexe Igné Bushveld (CIB) en Afrique du Sud. Le Platreef contient un haut pourcentage de sulfures par rapport au dépôt analogue Merensky Reef des flancs est et ouest du CIB. Il est en contact direct avec les sédiments Néoarchéens à Paléoprotérozoïques qui sont une source potentielle de soufre locale. D'un autre côté, les analyses du Δ33S des sulfures du Platreef permettent d'identifier une contribution de soufre hétérogène provenant de la croûte terrestre, avant et après la mise en place du gisement.Cette étude démontre clairement que l'analyse multiple des isotopes du soufre est un outil puissant dans l'identification des sources de soufre des processus minéralisateurs de l'Archéen, ainsi que ceux impliquant des roches archéennes, et cette approche peut être appliquée à un éventail de problèmes et types de dépôt. Aussi, elle soulève des questions importantes sur le rôle du sulfate marin dans la formation des dépôts SMV de l'Archéen et les caractéristiques du magma du CIB.
Archibald, Sandy M. "The role of vapour in the transport and deposition of metals in ore-forming systems /." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82821.
Повний текст джерелаCalculations based on the solubility data indicate an economic high-sulphidation Au deposit (e.g., Nansatsu, Japan; 36 tonnes) could form in ~30,000 years, whereas a porphyry copper deposit (e.g., 50 million tonnes at 0.5% Cu) could form in as little as ~20,500 years, assuming transport only in the vapour phase.
Precious- and base-metal-rich composite scales, containing up to 111 ppm Au and 628 ppm Ag, occur in surface pipes at the Momotombo geothermal field, Nicaragua. Polysulphide scale fragments, comprising chalcopyrite, sphalerite, galena, electrum and hessite grains in a matrix of amorphous silica, formed as a result of cooling and ligand loss induced by boiling, during fluid ascent in well MT-36. Secondary bornite, stromeyerite and chalcocite/digenite replaced chalcopyrite through the addition of Cu and Ag and an increase in fO2 . A drop in pH due to well closure resulted in replacement of primary and secondary sulphides by tetrahedrite.
Reaction-path modelling using the program CHILLER simulates deposition of minerals from the reconstructed deep geothermal fluid, at temperature intervals (depths) along excess enthalpy and isoenthalpic boiling paths. These simulations accurately reproduce the paragenetic sequence of base- and precious-metal mineralization in the scales. The modelling indicates excess enthalpy boiling results in metal precipitation at greater depths than would be expected for isoenthalpic boiling, and that at Momotombo this occurs through the destabilisation of bisulphide complexes in response to loss of CO2 and H2 S during phase separation.
Jiang, Shao-Yong. "Chemical and boron isotopic compositions of tourmaline from sedex-type and metaevaporite ore deposits." Thesis, University of Bristol, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294950.
Повний текст джерелаWay, Bryan C. "Geology and Geochemistry of Sedimentary Ferromanganese Ore Deposits, Woodstock, New Brunswick, Canada." Thesis, Fredericton: University of New Brunswick, 2012. http://hdl.handle.net/1882/44600.
Повний текст джерелаLevitan, Denise Madeline. "Statistical Analysis of the Environmental Geochemistry of an Unmined Uranium Ore Deposit." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/64782.
Повний текст джерелаPh. D.
Meadows, Holly Rachael. "Mineral Geochemistry, Deformation and Ore Fluid Evolution in the Capricorn Orogen, WA." Thesis, Curtin University, 2017. http://hdl.handle.net/20.500.11937/69391.
Повний текст джерелаRempel, Kirsten U. "The solubility and speciation of molybdenum in water vapour at elevated temperatures and pressures : implications for ore genesis." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82411.
Повний текст джерелаCalculations based on the extrapolated solubility of MoO 3 in equilibrium with molybdenite at 600ºC and 500 bars, using average H2O and total S fluxes of actively degassing volcanoes, with fO2 and fS2 controlled by the assemblage hematite-magnetite-pyrite, indicate that the vapour phase can transport sufficient Mo in about 900,000 years (within the life of some geothermal systems) to form a deposit of 336 Mt, with an average grade of 0.087% Mo (e.g., the Endako Mo-porphyry deposit, Canada).
Schuh, Wolfram Dieter, and Wolfram Dieter Schuh. "Geology, geochemistry, and ore deposits of the Bau gold mining district, Sarawak, Malaysia." Diss., The University of Arizona, 1993. http://hdl.handle.net/10150/187561.
Повний текст джерелаRobison, Lori Carol 1955. "Geology and geochemistry of Proterozoic volcanic rocks bearing massive sulfide ore deposits, Bagdad, Arizona." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/558078.
Повний текст джерелаClaesson, Lars-Åke. "The geochemistry and palaeotectonic setting of lower proterozoic metavolcanic rocks and related intrusives in the Skellefte massive sulphide ore district, northern Sweden." Licentiate thesis, Luleå tekniska universitet, 1994. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26007.
Повний текст джерелаBao, Zhiwei. "Geochemistry of the sediment-hosted disseminated gold deposits in Southwestern Guizhou Province, China." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2001. http://theses.uqac.ca.
Повний текст джерелаPhillips, I. M. "The geochemistry and mineralogy of Carboniferous shales in relation to ore genesis in Northern England." Thesis, University of Newcastle Upon Tyne, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378355.
Повний текст джерелаCarignan, Jean. "Les isotopes du Pb en métallogénie : chronomètres et traceurs du mode de formation de gites de Mo, Au, Ni, Cu et Pb dans les provinces du Supérieur et de Grenville du Bouclier Canadien /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1992. http://theses.uqac.ca.
Повний текст джерелаLillo, Ramos Francisco Javier. "Geology and geochemistry of Linares-La Carolina Pb-ore field (southeastern border of the Hesperian Massif)." Thesis, University of Leeds, 1992. http://etheses.whiterose.ac.uk/12721/.
Повний текст джерелаJohnson, Nancy Ann 1958. "Geochemistry of two exhalite horizons at the Copper Chief Mine, Jerome District, Arizona." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/558106.
Повний текст джерелаSahlström, Fredrik. "Ore Petrography and Geochemistry of some REE-bearing Fe-oxide Assemblages from the Idkerberget Deposit, Bergslagen, Sweden." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-182875.
Повний текст джерелаVarphögar av apatitjärnmalm av Kirunatyp ifrån järnmalmsbrytning i Bergslagen, Sydcentrala Sverige, innehåller förhöjda halter av sällsynta jordartsmetaller. Ett projekt vid Uppsala Universitet undersöker förekomster av sällsynta jordartsmetaller och andra kritiska element i varphögar bland annat från apatitjärnmalmer. I denna studie har prover från ett av Bergslagens apatitjärnmalmsfält, Idkerberget, undersökts geokemiskt och petrografiskt med fokus på faser som innehåller sällsynta jordartsmetaller. Deras utvinningspotential och deras relation till liknande förekomster såsom Blötberget, Grängesberg samt Kiirunavaara har också tagits i beaktning. Bulkgeokemin i proverna analyserades med ICP-EM och ICP-MS. Polerprov av malmerna undersöktes medelst optisk mikroskopi, SEM-EDS samt med WDS-mikrosondteknik. Resultaten visar att malmerna framförallt består av magnetit och hematit, med mindre mängder silikater, flourapatit, pyrit, kopparkis, monazit-(Ce), allanit-(Ce), thoriumsilikat, titanit och zirkon. Sällsynta jordartsmetaller är i huvudsak bundna i flourapatit, men metamorfa och/eller hydrotermala processer har resulterat i nybildningen av exotiska mineral såsom monazit-(Ce), allanit-(Ce), och sekundär flourapatit. Dessa egenskaper har även observerats i apatitjärnmalmer från andra platser. Proverna från Idkerberget har 1-9 gånger högre koncentration av sällsynta jordartsmetaller än jordskorpan generellt, och lätta sällsynta jordartsmetaller är de mest anrikade. Dessa halter är relativt låga jämfört med sällsynta jordartsmalmer som bryts i dagsläget, men eftersom materialet förekommer i enorma varphögar gör tillgängligheten att metallerna ändå kan utvinnas med vinst om efterfrågan på denna resurs består.
Rigali, Mark Joseph 1963. "Chemical characterization of solid graphitic carbonaceous matter associated with the Oklo natural fission reactors and uranium ore deposits, Gabon (West Africa)." Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/288812.
Повний текст джерелаMagnan, Martin. "La zone 87 du gisement d'or et de cuivre du lac Troilus : pétrographie et géochimie /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1993. http://theses.uqac.ca.
Повний текст джерелаMekkaoui, Alaoui Moulay El Mustapha. "Caractérisation géochimique, pétrologique et métallogénique du gisement de sulfures massifs vocanogènes ANSIL /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1996. http://theses.uqac.ca.
Повний текст джерелаTörmänen, T. (Tuomo). "Ore mineralogy, geochemistry, and formation of the sediment-hosted sea floor massive sulfide deposits at Escanaba Trough, NE Pacific, with emphasis on the transport and deposition of gold." Doctoral thesis, University of Oulu, 2004. http://urn.fi/urn:isbn:9514276264.
Повний текст джерелаHarawa, Esau Tonderai. "Mineralogy and geochemistry of structurally-controlled metasomatic alteration of carbonate-rich manganese ore at Mamatwan Mine, Kalahari Manganese Field." Thesis, Rhodes University, 2017. http://hdl.handle.net/10962/4717.
Повний текст джерелаHammond, Napoleon Quaye. "The geochemistry of ore fluids and control of gold mineralization in banded iron-formation at the Kalahari Goldridge deposit, Kraaipan greenstone belt, South Africa." Thesis, Rhodes University, 2003. http://hdl.handle.net/10962/d1008370.
Повний текст джерелаKMBT_363
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Calapa, Kayla. "Hydrologic alteration and enhanced microbial reductive dissolution of Fe(III) (hydr)oxides under flow conditions in Fe(III)-rich rocks: contribution to cave-forming processes." University of Akron / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=akron1619628782604003.
Повний текст джерелаBlake, Kevin L. "The petrology, geochemistry and association to ore formation of the host rocks of the Kiirunavaara magnetite-apatite deposit, northern Sweden." Thesis, Cardiff University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321483.
Повний текст джерелаBeck, Kimberly D. "Investigation of the Lead Isotope Signatures of Marine Sediments in Relation to the Lead Isotope Signatures of Northern Andean Ores." FIU Digital Commons, 2015. http://digitalcommons.fiu.edu/etd/2201.
Повний текст джерелаDunbar, Alyssa C. "Using Surficial Geochemical Methods to Detect Anomalies of Ore Indicator Metals in a Peat Bog at McIlvenna Bay, Saskatchewan, Canada, as a Method for Blind VMS Deposit Exploration." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/35833.
Повний текст джерелаHarnois, Luc Carleton University Dissertation Geology. "Geochemistry of the ore chimney formation and associated metavolcanic rocks and gold deposits in the Flinton-Harlowe area, Grenville province, southeastern Ontario." Ottawa, 1987.
Знайти повний текст джерелаJohn, Kangeze Biteme. "Ore forming potential of the Atchiza Suite and Sustainable management of mineral deposits in Mozambique : "Petrology, geochemistry and sustainable management of mineral deposits"." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for geologi og bergteknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-20380.
Повний текст джерелаHowarth, Geoffrey Hamilton. "Petrogenesis and metallogenesis of the Panzhihua Fe-Ti oxide ore-bearing mafic layered intrusion, SW China." Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1001810.
Повний текст джерелаGreen, Bradley. "A study of the Wilkins and Green and Gold Copper-gold prospects, Olary Block, South Australia with emphasis on petrology, geochemistry and ore mineralogy /." Title page, contents and abstracts only, 1996. http://web4.library.adelaide.edu.au/theses/09SB/09sbg811.pdf.
Повний текст джерелаAustralian National Grid Reference (SI 54-2) 1:250 000. Four folded maps in pocket pasted onto back cover. Includes bibliographical references (leaves 62-68).
Chhun, Eath. "Ordovician igneous rocks of the central Lachlan Fold Belt : geochemical signatures of ore-related magmas /." University of Sydney. Geosciences, 2004. http://hdl.handle.net/2123/610.
Повний текст джерелаMichaud, Michael Julien. "The geology, petrology, geochemistry and platinum-group element-gold-copper-nickel ore assemblage of the Roby Zone, Lac des Iles mafic-ultramafic Complex, northwestern Ontario." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0027/MQ52068.pdf.
Повний текст джерелаBurkhard, Dorothee J. M. "Ore minerals and geochemistry in the serpentinites of the Eastern Central Alps (Davos to the Val Malenco) compared to occurrences in the Klamath Mountains (California and Oregon)." Heidelberg : Ruprecht-Karls-Universität, 1987. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=016704785&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Повний текст джерелаHalder, Stefan Verfasser], and Bernd [Akademischer Betreuer] [Lehmann. "Genesis of BIF-hosted iron ore deposits in the Carajás mineral province, Brazil : constraints from in-situ Fe isotope analysis and whole-rock geochemistry / Stefan Halder ; Betreuer: Bernd Lehmann." Clausthal-Zellerfeld : Technische Universität Clausthal, 2018. http://d-nb.info/1231364297/34.
Повний текст джерелаKokh, Maria. "Rôle du CO2 dans les transferts des métaux d'intérêt économique par les fluides géologiques." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30006/document.
Повний текст джерелаCarbon dioxide is the second component after water of geological fluids that operate at high temperature (T) and pressure (P) in the lithosphere, transport the metals and form economic deposits. However, its effect on the mobilization and precipitation of metals remains virtually unknown owing to a lack of direct data and physical-chemical models. In this thesis, we have developped experimental methods and chemical and spectroscopic analyzes of CO2-rich fluids, coupled with thermodynamic modeling, to systematically quantify, for the first time, the solubility, distribution and speciation of various metals of economic interest (Fe, Cu, Au, Mo, Pt, Sn, Zn) in gas-water-salt systems typical of metalliferous hydrothermal fluids. Measurements of the solubility of the major minerals of these metals (sulfides, oxides and native metals) and of metal partition coefficients were carried out in supercritical fluids H2O-CO2-S-KCl at 450°C and 500-700 bar and in two-phase vapor-liquid systems H2O-CO2-NaCl-KCl-S at 350°C, 130-300 bar, using flexible-cell and phase-separation reactors that we have set up. The conditions of acidity, redox potential and sulfur fugacity were controlled by equilibria among iron sulfide and oxide minerals and alkali-aluminosilicate minerals or between sulfate and sulfide in the fluid. The data obtained were analyzed in the framework of a thermodynamic model coupled with a critical review of the literature on the metal speciation in the fluid phase. The electrostatic model that we used does not require any adjustable parameters; it is based on the dielectric constant of the CO2-H2O solvent and the Born parameter of the dominant species in the aqueous phase. Our results show that the mobility of metals in CO2-rich fluids is controlled by the nature and electrical charge of their main aqueous complexes. The presence of CO2 favors the stability of the neutral complexes (FeCl20, AuHS0, CuHS0, ZnCl20, KMoO40, Pt(HS)20) whereas that of the charged species of these metals (FeCl42-, Au(HS)2-, CuCl2-, ZnCl42-, HMoO4-, PtCl3-) is largely weakened. This results is significant fractionations between some metals, depending on the composition of the fluid and the geological context. Our model accounts for the enrichment in Fe and depletion in Cu observed in metamorphic orogenic gold deposits formed by CO2-rich fluids. The transport of gold by these fluids is favored at low sulfur content (Au(HS)0 is dominant), whereas in S-rich fluids typical of porphyry copper deposits and high T orogenic gold deposits where the charged complexes are dominant (Au(HS)2-, Au(HS)S3-), the presence of CO2 leads to lowering the solubility of gold. However, even at high CO2 content (> 50 wt%), the ability of fluids to carry gold as neutral species (~100s ppb) remains comparable to that of an aqueous fluid, which explains the associations of gold mineralizations with fluids rich in CO2. The effect of CO2 on the mobility of Mo, Zn and Si, which form neutral species, is weak in most geological situations, whereas that of Sn could be promoted by carbonate complexes and that of Pt by carbonyl (CO) complexing. The direct role of CO2 in the vapor-liquid partitioning of most metals is relatively small compared to that of reduced sulfur (H2S) whose presence strongly favors the enrichment of the vapor by Au, Pt, Mo and Cu. Thus, the main impact of CO2 in these demixing processes is to expand the fluid T-P domain of immiscibility. This study demonstrates that, contrary to common belief, the presence of CO2 can promote the mobility of certain metals and cause significant fractionations between different metals during the evolution of fluids in the crust
Polteau, Stéphane. "The early proterozoic Makganyene glacial event in South Africa : its implication in sequence stratigraphy interpretations, paleoenvironmental conditions and iron and manganese ore deposition." Thesis, Rhodes University, 2005. http://hdl.handle.net/10962/d1007612.
Повний текст джерелаTaylor, Mackenzie C. "GOLD FROM THE TYPE 4 ORE OF ROUND MOUNTAIN, NEVADA: A TEXTURAL AND MINERALOGICAL STUDY OF MACROCRYSTALLINE GOLD VS. DISSEMINATED GOLD." Miami University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=miami1512407677037903.
Повний текст джерелаZhao, Xinfu. "Paleoproterozoic crustal evolution and Fe-Cu metallogeny of the western Yangtze Block, SW China." Click to view the E-thesis via HKUTO, 2010. http://sunzi.lib.hku.hk/hkuto/record/B43572261.
Повний текст джерелаLu, Jun. "Inorganic and organic geochemistry of the zinc ores of the Idol Mine, East Tennessee." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06162009-063123/.
Повний текст джерелаKeller, Allison Lynn. "Preliminary High-Resolution Time-Lines Through the Cenomanian-Turonian (Late Cretaceous) Oceanic Anoxic Event (OAE 2)." Thesis, University of California, Riverside, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1602646.
Повний текст джерелаRapid changes in Earth?s marine environment are sufficiently rare that the scope and consequences of these events cannot be inventoried without recourse to the stratigraphic record of deep pre-historic time. Traditional stratigraphy divides geologic time into a succession of coarse biozones ? uneven time bins, each recognized by distinctive index fossils and spanning several hundred thousand to even a few million years. This thesis uses the CONOP software to resolve sequences of global appearance and disappearance events at the species level across the late Cenomanian oceanic anoxic event (OAE 2) at a much finer resolution than traditional biostratigraphy. The resulting time-lines include information for the Aptian to Maastrichtian from 501 locations, 4,962 taxa, and 25,112 local last occurrences. This dataset is large enough to represent the global environment and to compensate for the inevitably patchy and incomplete record preserved at any one location. Six geographically widespread clades ? ammonites, calcareous nannofossils, dinocysts, benthic forams, planktonic forams, and radiolaria ? were analyzed; they span a range of trophic levels, composition and preferred habitat. Extinction pulses and intervals of falling diversity are not unique to OAE 2 or even uniquely severe. Several occur throughout the Albian-Santonian interval. The key is to monitor trends in diversification rate. OAE 2 is distinguished as a boundary between more positive (or equal in the ammonite case) and more negative diversification regimes. It may have been part of a general habitat deterioration or disturbance, but it would be too simplistic to describe it as a coordinated pelagic extinction event.
Mach, Craig J. "Tectonic controls, timing and geochemistry of supergene enrichment of the Tyrone porphyry copper deposit, Grant County, New Mexico /." abstract and full text PDF (UNR users only), 2009. 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:3342621.
Повний текст джерела"December, 2008." Accompanying CD-ROM contains appendices C and D. Appendix C: AutoCAD files with drill hole log; Appendix D: excel spreadsheet with copper mass balance calculations. Includes bibliographical references (leaves 206-215). Library also has microfilm. Ann Arbor, Mich. : ProQuest Information and Learning Company, [2009]. 1 microfilm reel ; 35 mm. Online version available on the World Wide Web.
Giovenazzo, Danielle. "Géologie et caractéristiques géochimiques des minéralisations Ni-Cu-EGP de la région de Delta, ceinture de Cape-Smith, Nouveau-Québec /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1991. http://theses.uqac.ca.
Повний текст джерелаOlivo, Gema Ribeiro. "Les gites d'or palladifères des mines de Caue et de Conceicao, dans les formations de fer du type lac Supérieur du district d'Itabira, Craton Sao Francisco, Bresil : structure, minéralogie, géochronologie et métallogenie = (Palladium-bearing gold deposits of the caue and conceicao mines, hosted by lake superior-type iron-formations of the Itabira district, Sao Francisco craton, Brazil : structure, mineralogy, geochronology and metallogeny) /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1994. http://theses.uqac.ca.
Повний текст джерелаSchmauder, Gretchen C. "Thermal and chemical profiling of the Bald Mountain District, White Pine County, Nevada /." abstract and full text PDF (free order & download UNR users only), 2005. http://0-wwwlib.umi.com.innopac.library.unr.edu/dissertations/fullcit/1433099.
Повний текст джерела"August, 2005." Includes bibliographical references. Library also has microfilm. Ann Arbor, Mich. : ProQuest Information and Learning Company, [2005]. 1 microfilm reel ; 35 mm. Online version available on the World Wide Web.
Doyle, Jessica B. "Geology and structure of Winters Creek, Jerritt Canyon District, Elko County, Nevada." abstract and full text PDF (free order & download 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:1447627.
Повний текст джерелаChi, Guoxiang. "Contrôle polygénétique sur la localisation des gisements proximaux et distaux dans le champ polymétallique-stannifère à Xinlu, Guangxi, Chine méridionale /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1992. http://theses.uqac.ca.
Повний текст джерелаVoicu, Gabriel. "Géologie, géochimie et métallogénie du gisement d'or Omai, Bouclier Guyanais, Amérique du Sud = Geology, geochemistry and metallogeny of the Omai Gold Deposit, Guiana Shield, South America /." Thèse, Montréal : Chicoutimi : Université du Québec à Montréal ;. Université du Québec à Chicoutimi, 1999. http://theses.uqac.ca.
Повний текст джерела