Morphotectonic evolution of Parduni Basin: An intradun piggyback basin in western Doon valley,NW Outer Himalaya |
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Authors: | G Philip N S Virdi N Suresh |
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Institution: | (1) Geoscience Division, North-East Institute of Science and Technology, Jorhat, 785006, India;(2) Wadia Institute of Himalayan Geology, Dehradun, 248001, India |
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Abstract: | During the course of mapping of active faults in the northwestern Outer Himalaya (using CORONA photographs, multispectral
satellite data of Indian Remote Sensing satellite (IRS) and aerial photographs) we have identified an isolated basin of Quaternary
and Holocene sediments resting unconformably on Siwaliks, around Parduni, in the northwestern Dehra Dun (Doon) valley. The
region around Parduni is tectonically very complex and is traversed by active thrust faults to its north and south and strike
slip faults to its east and west. The uplift and southward shift along the strike slip faults on both sides and the Markanda
thrust edging to its south, the Parduni has developed as an intradun basin and now remains isolated from the main Doon valley.
Based on the OSL age data widespread deposition of Quaternary alluvial fan sediments, the dun gravels, is inferred to have
initiated around 34 ka BP in the western part of the Doon valley, while the sedimentation in the Parduni Basin started only
around 27 ka BP, which more or less ceased around 20 ka. The southward movement of the Parduni Basin as a piggyback basin
is ongoing with recent alluvial deposits covering the dun gravels tectonically overlain by the Siwalik sandstone and mudstones
in the hanging wall of the Markanda thrust. The present communication discusses the development and evolution of the Parduni
Basin vis-à-vis the configuration of the Doon valley in the northwestern Outer Himalaya and the prevalence of tectonics expressed
or demonstrated in the active Himalayan Front. |
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