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

作     者：Fuyuan An Zhongping Lai Xiangjun Liu Yixuan Wang Qiufang Chang Baoliang Lu Xiaoyun Yang 

作者机构：Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake ResourcesQinghai Institute of Salt Lakes Chinese Academy of SciencesXining 810008China Qinghai Provincial Key Laboratory of Geology and Environment of Salt LakesQinghai Institute of Salt LakesChinese Academy of SciencesXining 810008China University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Cryosphere SciencesCold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of SciencesLanzhou 730000China School of Earth SciencesChina University of GeoscieneesWuhan 430074China Department of GeologyBaylor UniversityWaco 76798USA 

出 版 物：《Journal of Earth Science》 (地球科学学刊（英文版）)

年 卷 期：2018年第29卷第3期

页      面：695-706页

核心收录：

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 09[农学] 0903[农学-农业资源与环境] 

基　　金：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) the instrument function development program of the Chinese Academy of Sciences(No.Y410041013) 

主　　题：luminescence and radiocarbon dating 14C reservoir age Heihai Lake Qinghai-Tibetan Plateau(QTP) palaeoclimate implications. 

摘      要：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.