Journal
QUATERNARY INTERNATIONAL
Volume 218, Issue 1-2, Pages 104-117Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.quaint.2009.05.009
Keywords
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Funding
- Deutsche Forschungsgemeinschaft (DFG)
- Chinese Academy of Sciences/Institute of Tibetan Plateau Research [Schw 671/5-1, Schw 671/5-2, Schu 949/9-1, Schu 949/9-2]
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Holocene sediments from a 9 m high outcrop at the Gangyasang Qu's entry into Lake Nam Co, on the south-eastern Tibetan Plateau, were studied in a multiproxy approach. The lowermost part of the section is of early Holocene age and consists of varved sediments deposited in a proglacial lake. Geomorphological investigations of fossil beach ridges and fossil cliff lines in the littoral zone of Nam Co indicate a late Pleistocene lake level high of 29 m above the present level. A warming is visible in ostracode-rich silts deposited after 9.6 ka BR An ostracode-based transfer function estimates a lake level 28 m higher than today from this time until about 5.2 ka BP. A late Pleistocene lake level high was accompanied by an increase in lake size, causing Nam Co to overflow into the lower course of Gangyasang Qu, where a bay with slack-water conditions formed. Between 4.2 and 1.3 ka BP the lake level was approximately 10 m higher than today. The progradation of the Gangyasang Qu delta into Nam Co and the decreasing lake level shifted the study site into a fluvio-lacustrine environment. The sandy character and relatively low numbers of ostracode valves in the topmost sediments indicate increased fluvial activity, possibly due to a temporary increase in flood frequency. This facies lasted at least until 1.3 ka BP, when the lake level of Nam Co dropped again and the river incised more than 10 m into the underlying fluvio-lacustrine and lacustrine sediments. (C) 2009 Elsevier Ltd and INQUA. All rights reserved.
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