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The DASA Graben in Northern Niger:A Case of a Paleo-Mesozoic Basin Evolving from Uplifting to Rifting

Journal of Geological Resource and Engineering 2020年第3期8卷 67-79页

作者： Sani Abdoulwahid KonatéMoussa Wollenberg Peter Department of Geology Abdou Moumouni UniversityB.P.10662NiameyNiger Global Atomic Corporation TorontoCanada

The N70°DASA graben is a closed-rift that seems to be the deepest part of the Tim MersoïBasin,which is located in the northwestern part of Niger in West *** contains more than 805 m of Paleozoic-Mesozoic *** tectonic subsidence and uplifting was calculated by using well log data and deducing the variations in sedimentary thicknesses over *** mapping and tectono-sedimentary analysis indicate that the structural evolution of the DASA trough is characterized by two major periods:(1)the first period was marked by an uplift stage ranging from the Carboniferous to the *** was typified by a weak subsidence rate(3.45 m/Ma on average),under a transpressive tectonic regime,with a decrease in the thickness of the sedimentary series along the axial zone of the trough,and an increase of the thickness towards the border areas;(2)the second period was characterized by a higher subsidence rate(4.11 m/Ma on average)related to a change in the tectonic *** was marked by a rifting stage preserved over a long period,subjected to an extensive tectonic regime,from the Triassic to the lower Cretaceous,during which the highest thicknesses of the sedimentary series developed in the axial zone of the *** structural and sedimentological features defined the DASA graben as a particular type of syn-sedimentary basin evolving from a transpressive tectonic regime during the Paleozoic to an extensive tectonic regime during the Lower ***,the second period marked by an extensional regime would probably be related to the opening of the first stages of the Atlantic Ocean.

关键词： DASA graben tectono-sedimentary uplift rifting polyphasic evolution north Niger.

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