Precambrian basin-margin fan deposits: Mesoproterozoic Bagalkot Group, India
详细信息 查看全文
- 作者：Pradip K. Bose ; Subir Sarkar ; Soumik Mukhopadhyay ; Bikas Saha ; Patrick Eriksson
- 关键词：Scree cone ; Alluvial fan ; Facies architecture ; Fluvial architectural elements ; Element packaging ; Lateral variability ; Tectonic control ; Mesoproterozoic ; Bagalkot basin-margin
- 刊名：Precambrian Research
- 出版年：2008
- 出版时间：5 April 2008
- 年：2008
- 卷：162
- 期：1-2
- 页码：264-283
- 全文大小：4762 K
文摘
Three-dimensional facies variability in coarse clastic sedimentary rocks (breccia, conglomerates and coarse-grained sandstones) at the base of the Ramdurg Formation suggests terrestrial scree and fans giving way downslope to fluvial sediments along the margin of the Mesoproterozoic Bagalkot basin in India. In consistency with the basic tenet of Precambrian alluvial sedimentation, fluvial architectural elements and field location-specific consistency in channel-flow direction support an invariably braided pattern for the rivers, although the architectural element-packaging pattern does show distinct changes downslope, with channel belts thinning and becoming more regular in their geometry. With possible persistence of a semi-arid climate, downslope change in flow durability in the channels was controlled primarily by water discharge, depending on position of the channels with respect to the mean level of the water table–basin-margin slope intersection.