Découverte de structures périglaciaires (sand-wedges et composite-wedges) sur le site de stockage de déchets radioactifs de l'Aube (France) |
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| Authors: | Pierre Antoine Albert Marchiol Marcel Brocandel Yves Gros |
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| Institution: | a« Environnements quaternaires – Dynamiques naturelles et anthropisation », laboratoire de géographie physique, 1, place Aristide-Briand, 92 195 Meudon cedex, France;bAndra, DI/DCS/CA/SE, service « Sûreté Environnement », Centre de l'Aube BP7, 10200 Soulaines-Dhuys, France;cAndra, DS/MG, service « Milieux géologiques », 1–7, rue Jean-Monnet, parc de la Croix-Blanche, 92298 Châtenay-Malabry cedex, France;dAntea/DT, direction technique, BP 6119, 45 061 Orléans cedex 2, France |
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| Abstract: | Since 1990, a dense network of subvertical cracks has been observed at the upper part of the Albian sands of the site of radioactive waste storage operated by ANDRA. New studies carried out in 1999 during enlargement of the site of Soulaines and in 2003 on the nearby TFA site highlighted an especially well-developed network of periglacial features that are mainly of the sand-wedge type (subvertical stratified infill). These observations demonstrate the periglacial origin of these cracks, which are mainly superimposed on a dense network of former tectonic extension joints, and that rapidly disappear at the top of the underlying clays. In addition, these observations currently represent the only example of a large sand-wedge network developed during the Last Glacial in northern France. To cite this article: P. Antoine et al., C. R. Geoscience 337 (2005). |
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| Keywords: | Mots-clé s: Sand-wedges Environnements pé riglaciaires Sables aptiens Dernier glaciaire France septentrionaleSand-wedges Periglacial environment Aptians sands Last Glacial Northern France |
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