Post-LGM glacial retreat drives aggradation in the interiors of the Kashmir Himalaya

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Authors

Saptarshi Dey , Naveen Chauhan, Anushka Vashistha, Vikrant Jain

Abstract

Understanding the response of glaciated catchments to climate change is fundamental for assessing sediment transport from the high-elevation, semi-arid to arid sectors in the Himalaya to the foreland basin. The fluvioglacial sediments stored in the semi-arid Padder valley in the Kashmir Himalaya record valley aggradation during ~19-11 ka. We relate the valley aggradation to increased sediment supply from the deglaciated catchment during the glacial-to-interglacial phase transition. Previously-published bedrock-exposure ages in the upper Chenab valley suggest ~180 km retreat of the valley glacier during ~20-15 ka. Increasing roundness of sand-grains and reducing mean grain-size from the bottom to the top of the valley-fill sequence hint about increasing fluvial transport with time and corroborate with the glacial retreat history. Our result also correlates well with late Pleistocene-early Holocene sediment aggradation observed across most Western Himalayan valleys. It highlights the spatiotemporal synchronicity of sediment transfer from the Himalayas triggered by climate change.

DOI

https://doi.org/10.31223/X5M91G

Subjects

Earth Sciences, Physical Sciences and Mathematics

Keywords

deglaciation, Last Glacial Maximum, Luminescence dating, Kashmir Himalaya

Dates

Published: 2021-06-24 13:37

Last Updated: 2021-06-24 20:37

License

CC BY Attribution 4.0 International

Additional Metadata

Conflict of interest statement:
None

Data Availability (Reason not available):
data confidential and can only be shared for collaboration

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