Oolitic beach barriers of the last Glacial sea-level lowstand at the outer Bengal shelf

被引：44
|
作者：
Wiedicke, M
Kudrass, HR
Hübscher, C
机构：
[1] Fed Inst Geosci & Nat Resources, D-30655 Hannover, Germany
[2] Univ Bremen, Dept Earth Sci, D-28359 Bremen, Germany
来源：
MARINE GEOLOGY | 1999年 / 157卷 / 1-2期
关键词：
Bay of Bengal; ooids; beach ridges; Pleistocene; sea-level changes;
D O I：
10.1016/S0025-3227(98)00162-5
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
During RV Sonne cruise 93 the Bengal shelf was surveyed using sediment echosounding, side-scan sonar and sediment coring techniques. A sequence of shallow ridges was discovered each between 100 m and 260 m wide and extending for kilometres parallel to the 120-130-m isobaths. The ridges mark the top of a barely covered regressive sediment sequence and consist of oolitic limestone of Late Pleistocene age. They are interpreted as contouring fossil shorelines of sea-level lowstands of the Last Glacial Maximum. Their lithology indicates that fine-grained sediment supplied by the Ganges/Brahmaputra river system did not 'pollute' the nearshore environment during Glacial times; this argues for sediment bypassing of the Bengal shelf and a direct supply to the Bengal deep-sea fan. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：7 / 18
页数：12
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