青藏高原东北缘晚更新世以来环境变化研究进展  

Progress of Environmental Change in the Northeastern Tibetan Plateau Since Late Pleistocene

作　　者：柯思茵 张冬丽 王伟涛[1,2,3] 王孟豪 段磊[1,2,3] 杨敬钧 孙鑫 郑文俊 KE Siyin;ZHANG Dongli;WANG Weitao;WANG Menghao;DUAN Lei;YANG Jingjun;SUN Xin;ZHENG Wenjun(Guangdong Provincial Key Laboratory of Geodynamics and Geohazards,School of Earth Sciences and Engineering,Sun Yat-sen University,Guangzhou 510275,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai Guangdong 519082,China;State Key Laboratory of Earthquake Dynamics,Institute of Geology,China Earthquake Administration,Beijing 100029,China)

机构地区：[1]中山大学地球科学与工程学院广东省地球动力作用与地质灾害重点实验室,广东广州510275 [2]南方海洋科学与工程广东省实验室(珠海),广东珠海519082 [3]中国地震局地质研究所地震动力学国家重点实验室,北京100029

出　　处：《地球科学进展》2021年第7期727-739,共13页Advances in Earth Science

基　　金：第二次青藏高原综合科学考察研究项目“活动断裂与地震灾害”(编号:2019QZKK0901);国家自然科学基金项目“基于三维构造模型的滨海断裂带地震危险性评价和震害情景预测”(编号:41774049)资助。

摘　　要：青藏高原东北缘作为响应东亚季风边缘区环境变化的理想场所,其丰富的沉积记录可反映详细的环境变化过程。重点对近30年来青藏高原东北缘沉积与环境演化研究中的年代学、环境代用指标、环境演化过程及区域一致性等方面的主要研究进展进行总结。青藏高原东北缘环境研究中粒度、磁化率、碳酸盐含量和以总有机碳、常微量元素为主的地球化学指标是最常用的研究手段;综合区域晚更新世以来沉积环境研究结果,将高原东北缘环境演化过程分成5个阶段,即在东亚季风和西风环流的共同影响下经历了温暖湿润—寒冷干燥—温暖偏湿—偏冷干燥转温凉偏湿—相对温湿转相对冷干的发展阶段;而青藏高原东北缘气候记录与亚洲区域及全球记录对比结果显示具有区域性,其主要因素可能是北半球太阳辐射变化的驱动所导致的高纬度温度和冰量变化以及北大西洋温盐环流的影响;青藏高原东北缘晚更新世可能存在两期大范围的高湖面,分别在MIS 3和MIS 5阶段,其时间的差异显示从高原内部向东北方向高湖面出现的时间逐渐变年轻,可能反映了高原东北缘构造与环境变化的响应。综合认为,未来青藏高原东北缘环境研究重点可从高分辨率沉积序列的建立、高湖面时间的确立以及更精确的环境代用指标应用等方面进一步深入研究,以期获得更高分辨的环境变化信息。The northeastern Tibetan Plateau is an ideal area to study the environmental changes in the East Asian monsoon marginal zone,and its rich sedimentary records can reflect the detailed environmental change process. The main research progress of sedimentation environment evolution on the northeastern Tibetan Plateau during the past 30 years is summarized,focusing on the chronological frame,the proxies for environmental research, environmental evolution process and the regional consistency of environmental changes in the northeastern Tibetan Plateau. The grain size,magnetic susceptibility and geochemical indicators dominated by carbonate content,total organic carbon and major and minor elements are the most commonly research methods in environmental studies in the northeastern Tibetan Plateau. Based on the research results of sedimentary environment since Late Pleistocene,the evolution process can be divided into five stages,which experienced the development stages of being warm and humid cold and dry,slightly warm and humid,slightly cold and dry then slightly moderate-wet,relatively moderate warm and humid then moderate cold and dry with the common influence of East Asian monsoon and west wind. The climate records of the northeastern margin of the QinghaiTibet Plateau are regional compared with those of Asia and the world,and the main factors may be driven by the change of solar radiation in the northern hemisphere and the North Atlantic thermohaline circulation. The research shows that there may be two periods of high lake level with large area,namely MIS 3 and MIS 5 stages.The difference of times shows that the occurrence time of high lake level becomes younger from the interior of the Tibetan Plateau to the northeast,which may reflect a response of tectonic and environmental changes in the northeastern Tibetan Plateau. In conclusion,the further environmental research on the northeastern Tibetan Plateau may focus on the establishment of high-resolution sedimentary sequence,the time of high lake level and the appli

关 键 词：沉积序列 环境变化 气候波动 晚更新世 青藏高原东北缘 

分 类 号：P534.63[天文地球—第四纪地质学]