New Concepts on the Tectonic Zonation of Bengal Foredeep
New Concepts on the Tectonic Zonation of Bengal Foredeep
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孟加拉前渊构造分带的新概念
DOI：
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发表时间：
1986
期刊：
影响因子：
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通讯作者：
A. Kononov
中科院分区：
文献类型：
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作者：
M. Matin;M. Fariduddin;M. Husain;M. Khan;M. Boul;A. Kononov
孟加拉前渊是阿拉干-约马地槽的一个山前前渊，在古新世-始新世进入造山阶段。根据始新统及更老沉积物的厚度分布和相态特征，地槽的北西边界可沿着所谓的枢纽带划定。铰链带以东地区，直到阿拉干-约马中生代沉积露头，在那里，糖蜜积累在地槽（复理石）盆地被认为是本作者的“内部带”的前渊。前渊的西部，即铰链区和印度地盾露头之间，糖蜜沉积在平台（陆架）盆地上，被认为是“外部区”。此外，内部区域分为（i）东吉大港折叠分区和（ii）西达卡分区，而外部区域分别分为（1）拉杰沙希分区（ii）铰链分区和（iii）上阿萨姆邦分区。
Abstract The Bengal Foredeep is a submontane Foredeep of the Arakan Yoma geosyncline, that entered the orogenic stage of its development in the Paleocene – Eocene time. The North Western boundary of geosyncline judging by the characteristics of thickness distribution and Facies of Eocene and older sediments may be drawn along the so called Hinge zone. Areas east of the Hinge zone up to Arakan-Yoma Mesozoic sedimentary outcrops, where molasses accumulated on a geosyncline (Flysch) basin are considered by the present authors as the “Internal Zone” of the foredeep. The western part of the foredeep, i.e. between the Hinge zone and Indian Shield outcrops, where the molasses were deposited on a platform (Shelf) basin, are considered as the “External zone”. Further the Internal zone is divided into (i) The Eastern Chittagong folded subzone and (ii) The Western Dhaka subzone whereas the External zone is divided into (1) The Rajshahi subzone (ii) The Hinge subzone and (iii) The Upper Assam Subzone respectively.