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

  • Environmental Geology and Marine Geology
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Abstract

The accurately determining the lake 14C reservoir age has a 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 the Heihai Lake catchment. Accelerator mass spectrometry (AMS) 14C dating 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 quantitative 14C reservoir ages were estimated to lie between 3 353 and 3 464 yr during the 1.8 to 2.4 ka, which showed temporal variation. The sources of old carbon are the dissolution of carbonate bedrocks distributed along the Kunlun Mountain. The OSL ages of the different members of the hydatogen sedimentary system at Heihai Lake catchment indicate that a stronger hydrologic condition occurred from 3.0±0.2 to 1.8±0.2 ka, with a maximum lake level of 9 m higher 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 the Heihai Lake area during this stage.

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Acknowledgments

This study was supported by the National Natural Science Foundation of China (No. 41401008), West Light Foundation of the Chinese Academy of Sciences (No. Y412021005), Natural Science Foundation of Qinghai Province (No. 2016-ZJ-926Q), and the instrument function development program of the Chinese Academy of Sciences (No. Y410041013). We thank Lupeng Yu, Tianyuan Chen for their help and discussions. The final publication is available at Springer via https://doi.org/10.1007/s12583-017-0972-9.

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Correspondence to Fuyuan An.

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An, F., Lai, Z., Liu, X. et al. Luminescence Chronology and Radiocarbon Reservoir Age Determination of Lacustrine Sediments from the Heihai Lake, NE Qinghai-Tibetan Plateau and Its Paleoclimate Implications. J. Earth Sci. 29, 695–706 (2018). https://doi.org/10.1007/s12583-017-0972-9

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  • DOI: https://doi.org/10.1007/s12583-017-0972-9

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