巴丹吉林沙漠南缘冲洪积物的光释光年代及其水文学意义  

OSL Ages and Its Hydrological Implications of Alluvial-Diluvial Deposits from the Southern Margin of Badain Jaran Desert

作　　者：姜高磊[1,2] 聂振龙 刘哲[1,2] 王哲[1] 赵华 杨劲松[1,2] 申建梅[1] Jiang Gaolei;Nie Zhenlong;Liu Zhe;Wang Zhe;Zhao Hua;Yang Jinsong;Shen Jianmei(Institute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences,Shijiazhuang 050061,China;Key Laboratory of Quaternary Chronology and Hydro-Environment Evolution,China Geological Survey,Shijiazhuang 050061,China)

机构地区：[1]中国地质科学院水文地质环境地质研究所,河北石家庄050061 [2]中国地质调查局第四纪年代学与水文环境演变重点实验室,河北石家庄050061

出　　处：《地球科学》2021年第5期1829-1839,共11页Earth Science

基　　金：中国地质调查局项目(No.121201106000150093);国家自然科学基金项目(Nos.41807420,41807428);中国地质科学院水文地质环境地质研究所基本科研业务费项目(Nos.SK202007,SK201705)。

摘　　要：冲洪积物是古气候和古水文信息的重要记录,为了探讨巴丹吉林沙漠南缘地区全新世气候环境及其对区域地下水的影响,对沙漠南缘的水成沉积物进行了沉积学分析和光释光年代学测试,结果表明本文研究的两个沙漠南缘沉积剖面分别为全新世中期(6.6~5.2 ka)的间歇性河流沉积和暂时性流水形成的洪泛沉积.基于前人全新世中期沙漠中湖泊水位、气候环境重建,以及本文研究的冲洪积物的沉积特征与年代,表明在气候湿润的地质时期巴丹吉林沙漠南缘及山区的区域降水形成暂时性洪流和/或间歇性河流会对沙漠地区地下水进行补给.Alluvial-diluvial deposits can record climatic and hydrologic information in geological history and play an important role in the reconstruction of paleoenvironment. Aqueous deposits were discovered at the south margin of Badain Jaran desert,Northwest China. Based on sedimentological analyses, two sections of the deposits as palaeoflood deposit and paleofluvial deposit were identified. OSL dating suggests that the deposits formed in the Middle Holocene. The alluvial-diluvial deposits in the southern margin of Badain Jaran Desert were mainly formed under a humid climate during the Middle Holocene. Based on the previous paleoclimate study, comprehensive analysis of the location and sedimentary features and the previous research of paleoclimate in this region, a conceptual model of recharge to the Badain Jaran is proposed. During humid climatic phases,such as the Middle Holocene, the precipitation in this region and adjacent mountain areas recharged the groundwater of the desert area by temporary flood or/and intermittent stream.

关 键 词：巴丹吉林沙漠 冲洪积 光释光年代 全新世中期 地下水补给 水文地质 

分 类 号：P641[天文地球—地质矿产勘探]