Nouvelle lecture de la tectonique dans la région de Nahr-el-Kelb au Liban

A new study of the geology of the Nahr-el-Kelb region, situated 10 km northeast of Beirut, shows a complex tectonics not seen by Dubertret [Carte géologique au 1/200 000e feuille de Beyrouth avec notice explicative, 1954] while establishing his geologic section. The Neogene series observed (conglomerate, succession of sandstone, marl, clayey limestone, limestone, covered by massive limestone), lie disconformably on Cretaceous series and occur with a vertical dip in the Ghosta flexure in contradiction with the old vision of Dubertret [Carte géologique au 1/200 000e feuille de Beyrouth avec notice explicative, 1954; La bordure orientale de la Méditerranée en tant que témoin de l'évolution des accidents de l'Est africain, in: XXe Congrès géologique international, Associacion Servicios Geologicos Africanos Mexico, 1956, pp. 377-384] on the Neogene tectonics in Lebanon. In this flexure, close to the road crossing to Jiita, the upper conglomerate beds have variable dips. Starting close to the vertical, as for the underlying Cretaceous series, the dip gradually decreases in the upper conglomerate beds, to become horizontal at the top of the formation. The upper conglomerate is thus post-Miocene in age. To cite this article: R.M. Hamzeh, T. Haj-Chahine, C. R. Geoscience 337 (2005).