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Lake Level and Climate Changes between 42,000 and 18,000 14 C yr B.P. in the Tengger Desert, Northwestern China

2002; Cambridge University Press; Volume: 58; Issue: 1 Linguagem: Inglês

10.1006/qres.2002.2357

1096-0287

Hucai Zhang, Bernd Wünnemann, Yuzhen Ma, Jinlan Peng, Hans-J. Pachur, Jijun Li, Yuan Qi, Guangjie Chen, Hongbing Fang, Zhaodong Feng,

Geological formations and processes

Abstract Multiple lines of stratigraphic, geochemical, and fossil data suggest that fresh-mesohaline paleolakes were widespread in the Tengger Desert of northwestern China and underwent major fluctuations during the late Pleistocene. The paleolakes started to develop at ca. 42,000 14 C yr B.P. The lake levels were the highest between 35,000 and 22,000 14 C yr B.P., during which Megalake Tengger dominated the landscape. The climatic conditions at this time were unique for this area and have no modern analogue. After an episode of decline between 22,000 and 20,000 14 C yr B.P. and an episode of rebound between 20,000 and 18,600 14 C yr B.P., the paleolakes started to desiccate and completely disappeared around 18,000 14 C yr B.P. The environmental proxy data indicate that the Megalake Tengger formed under warm–humid climates. The reconstructed climatic variations appear to be correlative with the abrupt climatic events reconstructed for the North Atlantic.