Kong2011Cosmogenic Be-10 and Al-26 dating of paleolake shorelines in Tibet.pdf

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Kong2011Cosmogenic Be-10 and Al-26 dating of paleolake shorelines in Tibet.pdf

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Kong2011Cosmogenic Be-10 and Al-26 dating of paleolake shorelines in Tibet

Journal of Asian Earth Sciences 41 (2011) 263–273Contents lists available at ScienceDirect Journal of Asian Earth Sciences journal homepage: www.elsevier .com/locate / jseaesCosmogenic 10Be and 26Al dating of paleolake shorelines in Tibet Ping Kong a,?, Chunguang Na a, Roderick Brown b, Derek Fabel b, Stewart Freeman c, Wei Xiao a, Yajun Wang a aKey Laboratory of the Earth’s Deep Interior, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China bDepartment of Geographical and Earth Sciences, University of Glasgow, Glasgow G12 8QQ, Scotland, UK c Scottish Universities Environmental Research Centre, Rankine Avenue, Scottish Enterprise Technology Park, East Kilbride G75 0QF, Scotland, UKa r t i c l e i n f o Article history: Received 11 February 2010 Received in revised form 28 January 2011 Accepted 25 February 2011 Available online 10 March 2011 Keywords: Tibetan Plateau Lake shoreline Exposure age Monsoon Cosmogenic nuclide1367-9120/$ - see front matter 2011 Elsevier Ltd. A doi:10.1016/j.jseaes.2011.02.016 ? Corresponding author. Tel.: +86 10 fax E-mail address: pingkong@ (P. Kona b s t r a c t We have used in situ produced cosmogenic nuclides 10Be and 26Al to date lacustrine shorelines around eight lakes in Tibet. Two lakes located south of the Yarlung Tsangpo River discharged at high lake levels. One of them, Drolung Co (Co is a local term, meaning lake), became closed (its water level fell below its outlet channel) at 3.8 ka and lowered over 120 m vertically since then. This implies a significant change in intensity of precipitation driven by the Indian monsoon over southern Tibet in the middle-late Holocene. Nam Co and Dajia Co, located to the north of the Yarlung Tsangpo River, also drained at high lake levels and became closed 53–36 ka and 48 ka, respectively. Of four other lakes developed closely in the Qiangtang basin, north of the Yarlung Tsangpo River, Tangra Yum Co and Siling Co (located at 31–