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Advancing U-Pb high-temperature thermochronology by combining single grain and intra-grain dating

Defense Thèse de doctorat : Univ. Genève, 2017 - Sc. 5147 - 2017/11/02
Abstract We investigate the utility of the U-Pb isotopic system as a thermochronometer for the accessory phase apatite and its potential to yield continuous time(t)-Temperature(T)-paths over long geological timescales (>100 Ma). The apatite U-Pb thermochronomter has recently been proven to recover meaningful continuous t-T history, resolving reheating events from isothermal holding, solutions based on the principle of thermally activated volume diffusion. Several data sets involving apatite U-Pb bulk grain data however document scatter beyond that predicted by thermally activated volume diffusion and this thesis aims to address the nature of these observations. A new isotopic and geochemical dataset is established, which includes 1) ID-TIMS single grain apatite U-Pb dates, 2) LA-ICP-MS element maps, 3) LA-MC-ICP-MS U-Pb date profiles of selected apatites, 4) LA-ICP-MS U-Pb dates of zircon, 5) 40Ar/39Ar dates of white micas, to investigate the effect of parent isotope zonation and composition in diffusion studies.
Keywords U-Pb ThermochronologyIsotope geochemistryLA-MC-ICP-MS datingLA-ICP-MS element mappingGeochronologyNoble gas thermochronologyPb diffusion
URN: urn:nbn:ch:unige-1026018
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Thesis (24.1 MB) - public document Free access
Research group Isotope Geochemistry, Geochronology and Thermochronology
FNS: 200020_146332
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PAUL, André Navin. Advancing U-Pb high-temperature thermochronology by combining single grain and intra-grain dating. Université de Genève. Thèse, 2017. doi: 10.13097/archive-ouverte/unige:102601 https://archive-ouverte.unige.ch/unige:102601

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Deposited on : 2018-02-28

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