Biostratigraphy and geodynamic impact in the uppermost part of the northeastern coastal basin of Togo

详细信息    查看全文

• 作者：Pauline Yawoa D. Da Costa ; Ampah Kodjo C. Johnson ; Pascal Affaton
• 关键词：Coastal basin of Togo ; Stratigraphy ; Maastrichtian ; Paleogene ; Biozone ; Foraminifera ; Tectonics ; Paleogeography
• 刊名：Comptes Rendus Palevol
• 出版年：2009
• 出版时间：September 2009
• 年：2009
• 卷：8
• 期：6
• 页码：511-526
• 全文大小：2690 K

文摘

Lithological and micropaleontological studies of core-samples from five boreholes drilled in the northeastern part of the coastal basin of Togo allow for a specification of the stratigraphy and the paleogeography of this area during the Maastrichtian and Paleogene. A lithological analysis reveals a marine series consisting of a Lower Maastrichtian unit, a Middle Paleocene to Eocene unit, and an upper unit attributed to the Continental terminal sensu lato. The biostratigraphical study, based on planktonic foraminifera, has led to a characterization of the basin in terms of biozones ranging from the Globotruncana aegyptiaca to the Abathomphalus mayaroensis biozones and biozones P5 to P11, thus specifying a Middle to Upper Maastrichtian, an Upper Paleocene and a Lower to Middle Eocene units. The paleogeographical evolution of the area shows that the series recorded two sedimentary cycles: the first one stops at the end of the Cretaceous and the second one in the Paleogene.