Bedding Structures in a Channel Sand Bar of the Ganga River Near Allahabad, Uttar Pradesh, India
Bedding Structures in a Channel Sand Bar of the Ganga River Near Allahabad, Uttar Pradesh, India
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印度北方邦阿拉哈巴德附近恒河河道沙洲的层理结构
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发表时间：
1977
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影响因子：
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通讯作者：
I. Singh
中科院分区：
文献类型：
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作者：
I. Singh
摘要研究了阿拉哈巴德附近恒河一个河床砂坝裸露断面的层理结构。由中等至分选良好的砂组成的河坝，其特征是没有较大的床形，如巨纹。沙洲序列主要由低角度交错层理组成，交错层理是由沙洲背风面的主动横向移动产生的，冲刷和填充交错层理是由波动湍流的冲刷和快速沉积产生的。低角度交错层理与海滩坝交错层理十分相似。讨论了这种演替在古沉积环境重建中的重要性。
ABSTRACT Bedding structures of a well-exposed section across a channel bar in Ganga River near Allahabad are studied. The channel bar, composed of moderate to well sorted sands, is marked by the absence of larger bed forms such as megaripples. The bar succession is composed of mainly low-angle cross-bedding, produced by active lateral shifting of the lee-face of the bar, and scour and fill cross-bedding produced of scouring and quick deposition from fluctuating, turbulent currents. The low-angle cross-bedding is rather similar to beach bar cross-bedding. Importance of such successions in the environmental reconstruction of the ancient sediments is discussed.