末次冰盛期以来青藏高原东北部湟水河流域古洪水释光测年研究  

Optically Stimulated Luminescence(OSL)Study of Paleofloods in the Huangshui River Basin Northeast Qinghai-Xizang Plateau Since the Last Glacial Maximum

作　　者：曹贤毓 孙永娟 张洁[1,2] 汪家伟 孙满平 曾泳昕 鄂崇毅 CAO Xianyu;SUN Yongjuan;ZHANG Jie;WANG Jiawei;SUN Manping;ZENG Yongxin;E Chongyi(Key Laboratory of Xi-Zang Plateau Land Surface Processes and Ecological Conservation(Ministry of Education),Qinghai Normal University,Xining,810008,China;Qinghai Provincical Key Laboratory of Physical Geography and Environmental Process,College of Geographical Sciences,Qinghai Normal University,Xining,810008,China;College of History and Culture,Xihua Normal University,Nanchong,637001,China)

机构地区：[1]青海师范大学青藏高原地表过程与生态保育教育部重点实验室,青海西宁810008 [2]青海师范大学地理科学学院,青海省自然地理与环境过程重点实验室,青海西宁810008 [3]西华师范大学历史文化学院,四川南充637001

出　　处：《盐湖研究》2025年第2期47-53,共7页Journal of Salt Lake Research

基　　金：青海省应用基础项目(2021-ZJ-749)。

摘　　要：地处青藏高原东北部的湟水河流域蕴含着丰富的古洪水灾害信息,深入挖掘相应的沉积记录,有助于扩展湟水河流域古洪水记录的时空范围,增加对洪水灾害的科学认识。文章通过对湟水河流域详细的野外调查,发现了柳树湾(LSW)古洪水沉积物剖面和塔干(TG)山洪沉积物剖面。对上述剖面进行光释光年代学研究(OSL)和沉积物粒度分析,同时对比区域古气候记录发现:LSW剖面古洪水发生于11~8 ka,与早全新世亚洲夏季风的增强密切相关;TG剖面18次高频山洪片流集中发生于20~14 ka,指示湟水河流域的山洪事件主要发生在全球气候由末次盛冰期向末次冰消期的气候转型时期。There occurred ancient hydrological disasters in the Huangshui River Basin,northeast Qinghai-Xizang Plateau.The paleoflood sediments is an ideal material to reconstruct the frequency and range of during the past geological time in the Huangshui River basin.It helps to expand the spatiotemporal scope of paleoflood records in the Huangshui River basin and enhance the scientific understanding of flood disasters occurring mechanism.Through detailed field investigations in the Huangshui River Basin,we discovered the paleoflood sediment profile at Liushuwan(LSW)and the debris flow sediment profile at Tagan(TG).These above-mentioned sections were analyzed by using optically stimulated luminescence(OSL)dating and sediment grain size analyzing,and the mechanism is analyzed with regional paleoclimatic records.It was found that:the LSW profile records a paleoflood event that happened between 11 and 8 ka,which is closely associated with the strengthening of the Asian summer monsoon during the early Holocene.The TG profile reveals that eighteen high-frequency paleo flash-flood events occurred mainly between 20 and 14 ka,responding to a cold-warm transition period of Last Glacial Maximum to Late Glacial time.

关 键 词：光释光年代学 湟水河流域 古洪水事件 古山洪事件 

分 类 号：P512.2[天文地球—地质学] P532