Late Pleistocene Paleoflood Deposits Identified by Grain Size Signatures, Parsons Valley Lake, Nilgiris, Tamil Nadu
Authors
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Department Of Geology, Anna University, Chennai - 600 025
Priyanka Raja -
Department Of Geology, Anna University, Chennai - 600 025
Hema Achyuthan
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Department Of Geology, Anna University, Chennai - 600 025
K. Geethanjali
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Inter-University Accelerator Centre, New Delhi - 100 067
Pankaj Kumar
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Inter-University Accelerator Centre, New Delhi - 100 067
Sundeep Chopra
DOI:
https://doi.org/10.1007/s12594-018-0903-0Abstract
A study involving grain size analysis was carried out from the Parsons valley lake deposit, Nilgiris, India to determine the depositional environments and paleoflood events since late Pleistocene period (~29,838 cal yr BP). A 72 cm lacustrine core was collected from the lake and eight organic rich sediment samples were AMS radiocarbon dated. The study reveals variations in the grain size distribution chiefly influenced by regional climatic conditions. Paleoflood events have been identified by the individual sedimentary flood signatures of varying changes in the magnitude of sediment supply from the background silty sediment matrix around ~29,838 and ~8405 cal yr BP.
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