Rapid Last Glacial Maximum deglaciation in the Indian Himalaya coeval with midlatitude glaciers: New insights from 10Be‐dating of ice‐polished bedrock surfaces in the Chandra Valley, NW Himalaya

Despite a large number of dated glacial landforms in the Himalaya, the ice extent during the global Last Glacial Maximum (LGM) from 19 to 23 ka is only known to first order. New cosmogenic 10Be exposure ages from well‐preserved glacially polished surfaces, combined with published data, and an improv...

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Bibliographic Details
Published in:Geophysical research letters 2016-02, Vol.43 (4), p.1589-1597
Main Authors: Eugster, Patricia, Scherler, Dirk, Thiede, Rasmus C., Codilean, Alexandru T., Strecker, Manfred R.
Format: Article
Language:English
Subjects:
Bedrock
Beryllium 10
Chronology
Climate change
cosmogenic nuclides
Data
Deglaciation
Exposure
exposure dating
Geological time
glaciation
Glaciers
Himalaya
Ice
Ice ages
Ice dating
Landforms
Last Glacial Maximum
LGM
Meltwater
Recession
Reconstruction
Scaling
Southern Hemisphere
Temperature
Temperature effects
Valley glaciers
Valleys
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Summary:Despite a large number of dated glacial landforms in the Himalaya, the ice extent during the global Last Glacial Maximum (LGM) from 19 to 23 ka is only known to first order. New cosmogenic 10Be exposure ages from well‐preserved glacially polished surfaces, combined with published data, and an improved production rate scaling model allow reconstruction of the LGM ice extent and subsequent deglaciation in the Chandra Valley of NW India. We show that a >1000 m thick valley glacier retreated >150 km within a few thousand years after the onset of LGM deglaciation. By comparing the recession of the Chandra Valley Glacier and other Himalayan glaciers with those of Northern and Southern Hemisphere glaciers, we demonstrate that post‐LGM deglaciation was similar and nearly finished prior to the Bølling/Allerød interstadial. Our study supports the view that many Himalayan glaciers advanced during the LGM, likely in response to global variations in temperature. Key Points Exposure ages of ice‐polished surfaces similar to moraine boulders Extensive MIS‐2 (LGM) glaciation at the southern front of the Indian Himalaya Himalayan LGM deglaciation coeval with midlatitude LGM deglaciation
ISSN:0094-8276
1944-8007
DOI:10.1002/2015GL066077