Datation par la méthode U/Th d'un travertin quaternaire du Sud-Est marocain : implications paléoclimatiques pendant le Pléistocène moyen et supérieur |
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| Authors: | Larbi Boudad Lahcen Kabiri Samer Farkh Christophe Falguères Louis Rousseau Jacques Beauchamp Élisabeth Nicot Guillaume Cairanne |
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| Institution: | 1. Laboratoire des formations superficielles, faculté des sciences et techniques, BP 509, Boutalamine, Errachidia, Maroc;2. Laboratoire de préhistoire du Museum national d''histoire naturelle, UMR 6569, CNRS, 1, rue René-Panhard, 75013 Paris, France;3. Laboratoire de sédimentologie et géochimie, faculté des sciences, 33, rue Saint-Leu, 80039 Amiens cedex, France;4. Laboratoire de géologie des ensembles sédimentaires, université Paris-6, CP 116, 75752 Paris cedex 05, France;5. Département des sciences de la Terre, UMR 7072, université de Cergy-Pontoise, 95031 Cergy-Pontoise cedex, France;6. Laboratoire de géologie, École normale supérieure, UMR 8538, 75231 Paris cedex 05, France |
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| Abstract: | A large travertine outcrop south of Errachidia, southern Morocco, was studied and U/Th dated. The carbonate fraction was provided by groundwaters then, as now, from the eastern High Atlas percolating through the regional Infra-Cenomanian aquifer. There were two main periods of accumulation at ca 262 kyr BP and 20–11.5 kyr BP separated by a long discontinuity with some limited weathering and erosion and correlated in part with a period of erosion at 30–20 kyr BP further to the west. The two travertine-deposition periods suggest increased rainfall and/or cooler thermal conditions in the eastern High Atlas source regions. Massive travertine accumulation ceased at the end of the Upper Pleistocene. To cite this article: L. Boudad et al., C. R. Geoscience 335 (2003).To cite this article: L. Boudad et al., C. R. Geoscience 335 (2003). |
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| Keywords: | travertin Marge saharienne paléoclimat Pléistocène Holocène Maroc travertine Saharan margin palaeoclimate Pleistocene Holocene Morocco |
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