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Luminescence Chronology and Radiocarbon Reservoir Age Determination of Lacustrine Sediments from the Heihai Lake, NE Qinghai-Tibetan Plateau and Its Palaeoclimate Implications

Fuyuan An1,2*, Zhongping Lai3, Xiangjun Liu1, Yixuan Wang1, et al.
1 Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, and Key laboratory for salt lake geology and environment of Qinghai Province, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;2 State Key Laboratory of Cryosphere Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;3 School of Earth Sciences, China University of Geosciences, Wuhan 430074, China;4 Department of Geology, Baylor University, Waco 76798, United States

ABSTRACT: The accurately determining the lake 14C reservoir age has crucial significance for climatic reconstruction. In this study, the optically stimulated luminescence (OSL) dating method is employed to date samples from highstand lacustrine sediments, palaeoshoreline, fluvial terrace, and the alluvial fan of theHeihaiLakecatchment. Accelerator mass spectrometry (AMS)14Cdating was also used to date fossil plants from highstand lacustrine sediments. Based on the calculations of linear regression with OSL against radiocarbon ages for same layers of two sections, the quantitative14Creservoir ages were estimated to lie between 3353 and3464 aduring the 1.8 to 2.4 ka, which showing temporal variation. The sources of old carbon are the dissolution of carbonate bedrocks distributed along theKunlunMountain. The OSL ages of the different members of the hydatogen sedimentary system atHeihaiLakecatchment indicate that a stronger hydrologic condition occurred from 3.0±0.2 to 1.8±0.2 ka, with a maximum lake level of9 mhigher than present. This humid stage was widely recorded in different sediments on the QTP and Chinese Loess Plateau (CLP), indicating its broad synchronicity across the Asian summer monsoon region. The enhanced East Asian summer monsoon (EASM) and the Indian summer monsoon (ISM) resulted in the increase of moisture availability for theHeihaiLakearea during this stage.

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Keywords:Luminescence and radiocarbon dating, 14C reservoir age, Heihai Lake, Qinghai-Tibetan Plateau (QTP), palaeoclimate implications

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