Rate of late Quaternary ice-cap thinning on King George Island, South Shetland Islands, West Antarctica defined by cosmogenic 36Cl surface exposure dating |
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| Authors: | YEONG BAE SEONG LEWIS A OWEN HYOUN SOO LIM HO IL YOON YEADONG KIM YONG IL LEE MARC W CAFFEE |
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| Institution: | Department of Earth and Environmental Sciences, Korea University, Seoul 136-704, Korea,;Department of Geology, University of Cincinnati, Ohio 45221-0013, USA,;Korea Polar Research Institute, Incheon 406-840, Korea,;School of Earth and Environmental Sciences, Seoul National University, Seoul 151-747, Korea,;Department of Physics/PRIME Laboratory, Purdue University, West Lafayette, IN 47906, USA |
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| Abstract: | Glacial landforms on the Barton and Weaver peninsulas of King George Island in the South Shetland Islands, West Antarctica were mapped and dated using terrestrial cosmogenic 36Cl methods to provide the first quantitative terrestrial record for late Quaternary deglaciation in the South Shetland Islands. 36Cl ages on glacially eroded and striated bedrock surfaces range from 15.5±2.5 kyr to 1.0±0.7 kyr. The 36Cl ages are younger with decreasing altitude, indicating progressive downwasting of the southwestern part of the Collins Ice Cap at a rate of ∼12 mm yr−1 since 15.5±2.5 kyr ago, supporting the previously published marine records for the timing and estimate of the rate of deglaciation in this region. |
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