Palaeovalleys and fault-controlled depocentres in the Late-Ordovician glacial record of the Murzuq Basin (central Libya) |
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Authors: | Jean-François Ghienne Max Deynoux Giänreto Manatschal Jean-Loup Rubino |
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Institution: | 1. École et observatoire des sciences de la Terre, Centre de géochimie de la surface, CNRS–UMR 7517, 1, rue Blessig, 67084 Strasbourg cedex, France;2. CSTJF, av. Larribau, 64018 Pau cedex, France |
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Abstract: | In the Gargaf area, the stratigraphic architecture of the Late-Ordovician glacial drift results from successive glacial erosion events, with the location of the main glacial valleys partly controlled by inherited Panafrican structural trends, and by the existence of glacio-isostatically induced fault-related depocentres. Four laterally discontinuous, depositional units correspond to the filling of palaeovalleys. Each of the corresponding basal bounding surfaces was incised during a major ice front advance, reaching at least the northern Gargaf (>28°S). The bulk of the glacial record is made up of fluvial to shallow-marine sediments deposited in relatively distal glacial environments. Each unit, which recorded a glacial-interglacial climatic cycle, can be used for correlation throughout the Murzuq Basin and even at the scale of the North Gondwana platform. To cite this article: J.-F. Ghienne et al., C. R. Geoscience 335 (2003). |
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Keywords: | Libya Ordovician glaciation palaeovalley Libye Ordovicien glaciation paléovallée |
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