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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/6966

Title: Shelf storm flow dynamics: insight from the Mesoproterozoic Rampur Shale, central India
Authors: SARKAR, S
BANERJEE, S
CHAKRABORTY, S
BOSE, PK
Keywords: hummocky cross-stratification
sedimentary record
continental-shelf
atlantic bight
inner-shelf
deposition
shoreface
sandstone
currents
marine
Issue Date: 2002
Publisher: ELSEVIER SCIENCE BV
Citation: SEDIMENTARY GEOLOGY, 147(1-2), 89-104
Abstract: The intracratonic rift-related Mesoproterozoic Rampur Shale in Kudri, India formed in the marine mid- and outer shelf domain. It bears a dominant imprint of shore-parallel, storm-driven flow, as predicted by oceanographers for modem shelves, and thus differs from other ancient storm deposits in the geological record. In the Rampur Shale, gutters are shore-parallel, while tool marks of various kinds are both shore-parallel and shore-normal, and show bipolarity in both directions. Hydrodynamic analysis and inter-relationships between the flow features suggest that the storm-driven flow was shore-parallel, dominantly unidirectional and steady initially, and that it became increasingly unsteady thereafter, while also becoming dominantly shore-normal during peak oscillation. As storm conditions waned, the gutters were filled by sediments under dominant wave influence. These Rampur data are consistent with observations made in modem seas and suggest that storm-driven flows, in general, have evolved in the same way over time, although their geological records may vary in details because of local constraints. (C) 2002 .
URI: http://dx.doi.org/10.1016/S0037-0738(01)00189-0
http://dspace.library.iitb.ac.in/xmlui/handle/10054/6966
http://hdl.handle.net/10054/6966
ISSN: 0037-0738
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