Impact des événements tectono-volcaniques plio-pléistocènes sur la sédimentation en République de Djibouti (Afar Central) |
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| Authors: | M Boucarut M Clin P Pouchan Cl Thibault |
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| Institution: | 1. Institut de Géodynamique, Université de Bordeaux III, -33405, Talence Cedex
2. Institut du Quaternaire, Université de Bordeaux I, 33405, Talence, Cedex, France
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| Abstract: | The volcanic and sedimentary successive paleogeographic reconstructions, as well the volcanic emissions as the fluvial, lacustrine and marine deposits, are compared to the tectonic mechanisms, and show that the geologic history is controlled: - During Pliocene and lower Pleistocene times, by a collapse tectonics in the Red Sea - Aden Gulf area with a correlative uplift of the Tadjoura - Ali Sabîh hörst (a southern prolongation of the Danakil horst), and by a tectonic shear according to a NE-SW trend, which gives rise to NW-SE trending uplifts and basins (Nazaret phase of the Ethiopian rift).
- From the middle Pleistocene time, by the progressive opening, according to an EW direction, of the Gulf of Tadjoura, as a western prolongation of the Aden rift. A correlative epiglyptic arching, according to an EW direction, is located westwards. It appears as a superimposed structure with respect to the previous building.
The successive coastal uplifts since the lower Pleistocene are correlated to the successive alluvial deposits, which fit one-another, until the Holocene time included. |
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