末次间冰期以来毛乌素沙漠河湖相沉积发育年代起讫  

The beginning and the end of fluvial lacustrine sedimentary development in the Mu Us Desert since the last interglacial

作　　者：杨兴迪 刘小槺 李怡静 李小妹 梁爱民 YANG Xingdi;LIU Xiaokang;LI Yijing;LI Xiaomei;LIANG Aimin(School of Geography and Tourism,Shaanxi Normal University,Xi'an 710119;Engineering Center of Desertification and Blown-Sand Control of Ministry of Education,Faculty of Geographical Science,Beijing Normal University,Beijing 100875,China)

机构地区：[1]陕西师范大学地理科学与旅游学院,西安710119 [2]防沙治沙教育部工程研究中心,北京师范大学地理科学学部,北京100875

出　　处：《干旱区资源与环境》2024年第6期99-109,共11页Journal of Arid Land Resources and Environment

基　　金：陕西省社会科学基金项目(2023G011);科学技术部科技基础资源调查专项(2022FY202304);中央高校基本科研业务费专项资金(GK202301003);陕西省2021年自然科学基础研究计划(定向委托)项目(2021JCW-17);陕西师范大学2023年暑期社会实践"求真知"专家团队调查研究项目(2023SHSJZJ08)资助。

摘　　要：毛乌素沙漠地处东亚季风西北边缘,沙漠内部广泛发育风成沉积和河湖相沉积物,尤其是河湖相沉积物,因其沉积连续、分辨率高、受到的扰动较少等优点而被广泛用于古气候环境的重建。自末次间冰期以来,研究区发育了多期河湖相沉积,为探讨气候变化和湖泊消涨之间的关系提供了可能。文中通过对前人已有研究进行全面梳理,从88个典型剖面中筛选出54个具有代表性的沉积剖面及306个河湖相沉积的年代数据,对其进行归一化汇总、整理和校正,构建末次间冰期以来毛乌素沙漠河湖相沉积的发育年代框架。结果表明末次间冰期以来毛乌素沙漠河湖相沉积主要发育在以下三个时期:末次间冰期(140-70 ka B.P.)、末次冰期间冰阶(55-23 ka B.P.)以及末次冰消期至中全新世(15-3.0 ka B.P.)。结合区域对比和机制分析,认为毛乌素沙漠末次间冰期以来河湖消涨扩缩过程与东亚季风强弱变化关系密切。The Mu Us Desert is in the northwest edge of the East Asian monsoon,and there are extensive aeolian sediments and fluvial-lacustrine sediments in the desert,especially fluvial-lacustrine sediments,which are widely used in the reconstruction of paleoclimate environment due to their advantages of continuous deposition,high resolution and less disturbance.Since the last interglacial period,several stages of fluvial-lacustrine sediments have developed in the study area,which provides a possibility for the study of the relationship between climate change and the development and extinction of lakes.Based on a comprehensive review of previous studies,54 representative sedimentary profiles and the dating data of 306 fluvial-lacustrine sediments were selected from 88 typical profiles,which were normalized summarized,collated and corrected to build a chronological framework of fluvial-lacustrine sediments in the Mu Us Desert since the last interglacial period.The results show that the fluvial-lacustrine sediments in the Mu Us Desert since the last interglacial period mainly developed in the following three periods:the last interglacial period(140-70 ka B.P.),interstadial of the glacial(55-23 ka B.P.)and the last deglaciation to the middle Holocene(15-3.0 ka B.P.).Based on regional comparison and mechanism analysis,it is found that the development and extinction of rivers and lakes in the Mu Us Desert since the last interglacial period are closely related to the change of East Asian monsoon strength.

关 键 词：末次间冰期 毛乌素沙漠 河湖相沉积 年代起讫 

分 类 号：P512.2[天文地球—地质学] P931.1