Les placers à silice ultrapure français : étude gîtologique comparative |
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| Authors: | Laurent Désindes Laurent Bailly Jacques Leroy Marc Lespinasse |
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| Institution: | 1. UMR CNRS 7566 G2R, BP 239, 54506 Vand?uvre-les-Nancy cedex, France;2. BRGM, REM/MESY, BP 6009, 45060 Orléans cedex 2, France |
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| Abstract: | The comparative study of two French high-purity silica placers of European class suitable for the electrometallurgy of silicon and ferrosilicon, located at Boudeau and Thédirac, in the Dordogne and Lot departments respectively, indicates strong similarities as regards the sources and the transportation of quartz, as well as a same process of undercover karstification as a determining factor in the formation of the deposits. The main difference lies in the number of the stages necessary to the formation of the trap. This comparative study allows the constitution of dynamic models for the genesis of these economic quartz concentrations. To cite this article: L. Désindes et al., C. R. Geoscience 337 (2005). |
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| Keywords: | Placers de quartz ultrapur Galets fluviatiles Karstification sous couverture Corrosion cryptokarstique Lot Dordogne France High-purity quartz placers Fluvial gravels Undercover karstification Cryptokarstic corrosion Lot Dordogne France |
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