TERRAPUB Geochemical Journal

Geochemical Journal, Vol. 47 (No. 2), pp. 107-117, 2013

Melting history of the Patagonian Ice Sheet during Termination I inferred from marine sediments

Kazuyo Shiroya,1 Yusuke Yokoyama,2 Stephen Obrochta,2 Naomi Harada,3 Yosuke Miyairi2 and Hiroyuki Matsuzaki4

1Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
2Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Japan
3Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan
4Department of Nuclear Engineering and Management, The University of Tokyo, Bunkyo-ku, Japan

(Received March 26, 2012; Accepted August 5, 2012)

Abstract: To investigate the melting history of the Patagonian Ice Sheet (PIS) during the last deglaciation, we reconstructed Al2O3 flux in sediments from the Magellanes fjord (53°S) and southern Patagonia (55°S: Drake Passage) over the past 12 and 31 kiloyears (kyr), respectively. We confirm that the melting history of the PIS is recorded as changes in sedimentological signals and find that the melting ceased between ~10 and 8 Calendar kyr before present (cal kyr BP). The timing of major melting events of the PIS was similar to that of the Northern Hemisphere ice sheets.
Key words: Patagonian Ice Sheet, Termination I, melting history, Al2O3 flux, marine sediments

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