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Communication Dans Un Congrès Année : 2015

Continental-Scale Environmental and Geochemical Distal Effects of the Rochechouart Impact at the Lower Hettangian

Résumé

We give arguments showing that the Pb-Ag-Ba F-TI anomalies on the 200 Ma paleo-(sub)surface in western Europe likely have an impact-driven epithermal origin. We propose that they derive from the dust cloud induced by a bolide fall at Rochechouart, NW French Massif Central, 'France), then removal by rain and percolation along reactivated crustal lineaments. Coeval alterite formation resulted from a greenhouse effect related, and favoured Ba and Pb release from feldspars.
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Dates et versions

hal-04608696 , version 1 (11-06-2024)

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  • HAL Id : hal-04608696 , version 1

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Claire Ramboz, Philippe Chevremont, Philippe Lambert. Continental-Scale Environmental and Geochemical Distal Effects of the Rochechouart Impact at the Lower Hettangian. 13th SGA Biennial Meeting on Mineral Resources in a Sustainable World, Aug 2015, Nancy, France. ⟨hal-04608696⟩
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