An overview of the sedimentary geology of the Bengal Basin in relation to the regional tectonic framework and basin-fill history

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• 作者：Alam ; Mahmood ; Alam ; M. Mustafa ; Curray ; Joseph R. ; Chowdhury ; M. Lutfar Rahman ; Gani ; M. Royhan
• 关键词：Bengal basin ; India&ndash ; Asia collision ; Tectonic framework ; Geo-tectonic province ; Paleogeographic setting ; Basin-fill
• 刊名：Sedimentary Geology
• 出版年：2003
• 出版时间：February 1, 2003
• 年：2003
• 卷：155
• 期：3-4
• 页码：179-208
• 全文大小：824 K

文摘

The Bengal Basin in the northeastern part of Indian subcontinent, between the Indian Shield and Indo-Burman Ranges, comprises three geo-tectonic provinces: (1) The Stable Shelf; (2) The Central Deep Basin (extending from the Sylhet Trough in the northeast towards the Hatia Trough in the south); and (3) The Chittagong–Tripura Fold Belt. Due to location of the basin at the juncture of three interacting plates, viz., the Indian, Burma and Tibetan (Eurasian) Plates, the basin-fill history of these geo-tectonic provinces varied considerably. Precambrian metasediments and Permian–Carboniferous rocks have been encountered only in drill holes in the stable shelf province. After Precambrian peneplanation of the Indian Shield, sedimentation in the Bengal Basin started in isolated graben-controlled basins on the basement. With the breakup of Gondwanaland in the Jurassic and Cretaceous, and northward movement of the Indian Plate, the basin started downwarping in the Early Cretaceous and sedimentation started on the stable shelf and deep basin; and since then sedimentation has been continuous for most of the basin. Subsidence of the basin can be attributed to differential adjustments of the crust, collision with the various elements of south Asia, and uplift of the eastern Himalayas and the Indo-Burman Ranges. Movements along several well-established faults were initiated following the breakup of Gondwanaland and during downwarping in the Cretaceous.