New Insights into the Geomorphological Evolutionof the West African Reliefстатья
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Дата последнего поиска статьи во внешних источниках: 17 июля 2020 г.
Аннотация:Detailed mapping and prospecting drilling for bauxites in the territory of the Fouta-Djallon Plateauand Mandingo Mountains and the compilation on the succession, lithology, facies, and age of the Mesozoic–Cenozoic deposits of the marginal zone of the Senegal–Guinea Perioceanic Depression have allowedus to correlate and essentially update the scheme of the geomorphologic evolution of the territory of WestAfrica and to produce the map of planation surfaces. It has been demonstrated for the first time that the baselevel inverted in the Middle Miocene, and its emergence was responsible for paleogeographic changes andrelated regional (not local) accumulation of alluvial and lacustrine sediments of the Sangaredi Group, withthe subsequent formation of high-grade bauxites with a high content of boehmite. These bauxites were usedfor the first time as an age indicator in mapping the Middle–Late Miocene stepwise planation surface.