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Caractéristiques géochimiques originelles et transferts de matière lors de l'altération des roches volcaniques acides associées aux minéralisations uranifères

Abstract : Uranium deposits related to acidic volcanism are known on every continent, ranging in age from Proterozoic to present. These mineralizations show variable metal content from a few hundred to several hundred thousand metric tons of uranium. The processes that could lead to such concentrations have been studied in the present Ph.D. work, based on several examples including the volcanics from Ben Lomond (Australia), the Sierra Peña Blanca (Mexico), Macusani (Peru), Dornot (Mongolia), Xiangshan (China), McDermitt (USA) and Olympic Dam (Australia). Analyses of melt inclusions made it possible to determine magma typologies and initial compositions (U, metals, incompatible elements and volatiles) before postmagmatic overprint. Emplacement of volcanic rocks and their subsequent alteration induce losses and/or gains of elements which can be quantified by mass balance calculations between melt inclusions and altered rocks. Huge outflows of F-rich peralkaline volcanics and their subsequent long-term hydrothermal alteration in a caldera context are the most favorable for the formation of giant uranium deposits in volcanic settings.
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http://docnum.univ-lorraine.fr/prive/SCD_T_2004_0182_CHEMILLAC.pdf
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https://hal.univ-lorraine.fr/tel-01746754
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Submitted on : Thursday, March 29, 2018 - 10:44:14 AM
Last modification on : Wednesday, November 4, 2020 - 1:56:02 PM

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  • HAL Id : tel-01746754, version 1

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Rémy Chemillac. Caractéristiques géochimiques originelles et transferts de matière lors de l'altération des roches volcaniques acides associées aux minéralisations uranifères. Sciences de la Terre. Université Henri Poincaré - Nancy 1, 2004. Français. ⟨NNT : 2004NAN10182⟩. ⟨tel-01746754⟩

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