Evidence of Atlantic Extension in South-East Togo: Case of Fracturing in the Sandstone Relics of Tohoun  

作　　者：Essodina Padaro Mahaman Sani Tairou Yawoa Dzidzo Da Costa Zikpi Yawovi Amoudji Essodina Padaro;Mahaman Sani Tairou;Yawoa Dzidzo Da Costa;Zikpi Yawovi Amoudji(Département de Géologie, Faculté des Sciences, Université de Lomé, Lomé, Togo)

机构地区：[1]Département de Géologie, Faculté des Sciences, Université de Lomé, Lomé, Togo

出　　处：《International Journal of Geosciences》2021年第5期517-530,共14页地球科学国际期刊（英文）

摘　　要：The sandstone relics of probable Cretaceous age found around Tohoun show an extensional tectonics imprint associated with the Atlantic opening. This imprint consists of normal fault networks well expressed on two sites of outcrop and corresponds to three fracturing episodes materialized by families of conjugated planes striking E-W, NW-SE, and NE-SW. Striated plane data </span><span style="font-family:Verdana;">analysis shows three extensional axes successively N-S, NE-SW and</span><span style="font-family:Verdana;"> NNW-SSE. </span><span style="font-family:Verdana;">The reconstructed paleostress tensors can be attributed to pre- to syn-rift</span><span style="font-family:Verdana;"> phases responsible for the development of primary basin structures in the Gulf of Guinea. This preliminary analysis, concerning only fractures in the basal sequence relics, remains to be extended to the entire Togolese coastal basin to a better definition of the Atlantic dynamic.The sandstone relics of probable Cretaceous age found around Tohoun show an extensional tectonics imprint associated with the Atlantic opening. This imprint consists of normal fault networks well expressed on two sites of outcrop and corresponds to three fracturing episodes materialized by families of conjugated planes striking E-W, NW-SE, and NE-SW. Striated plane data </span><span style="font-family:Verdana;">analysis shows three extensional axes successively N-S, NE-SW and</span><span style="font-family:Verdana;"> NNW-SSE. </span><span style="font-family:Verdana;">The reconstructed paleostress tensors can be attributed to pre- to syn-rift</span><span style="font-family:Verdana;"> phases responsible for the development of primary basin structures in the Gulf of Guinea. This preliminary analysis, concerning only fractures in the basal sequence relics, remains to be extended to the entire Togolese coastal basin to a better definition of the Atlantic dynamic.

关 键 词：Fractures PALEOSTRESS Atlantic Extension South-Togo 

分 类 号：P54[天文地球—构造地质学]