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Age constraints on the late Quaternary evolution of Qinghai Lake, Tibetan Plateau |
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| Authors: | David B Madsen Ma Haizhou P Jeffrey Brantingham |
| Institution: | a Texas Archeological Research Laboratory, University of Texas, 1 University Station R7500, Austin, TX 78712, USA b Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, Qinghai 810008, PR China c Division of Earth and Ecosystem Sciences, Desert Research Institute, Reno, NV 89512, USA d Department of Anthropology, University of California Los Angeles, Los Angeles, CA 90095, USA e Department of Earth and Environmental Sciences, University of Illinois at Chicago, Chicago, IL 60607, USA |
| Abstract: | Dating and geomorphology of shoreline features in the Qinghai Lake basin of northwestern China suggest that, contrary to previous interpretations, the lake likely did not reach levels 66-140 m above modern within the past ∼ 90,000 yr. Maximum highstands of ∼ 20-66 m above modern probably date to Marine Isotope Stage (MIS) 5. MIS 3 highstands are undated and uncertain but may have been at or below post-glacial highs. The lake probably reached ∼ 3202-3206 m (+ 8-12 m) during the early Holocene but stayed below ∼ 3202 m after ∼ 8.4 ka. This shoreline history implies significantly different hydrologic balances in the Qinghai Lake basin before ∼ 90 ka and after ∼ 45 ka, possibly the result of a more expansive Asian monsoon in MIS 5. |
| Keywords: | Tibetan Plateau Late Quaternary Climate change Qinghai Lake Shoreline geomorphology |
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