晚渐新世以来青藏高原北部东昆仑山构造隆升对亚洲内陆干旱化的潜在影响——基于现代地质观测证据  

Potential role of the late Oligocene tectonic uplift in the eastern Kunlun Mountains of the Xizang(Tibet)in the formation of inner Asia aridification——Based on present geological observational evidence

作　　者：李乐意[1,2] 常宏 关冲[4,5] 陶亚玲[6] 沈俊杰 权春艳 秦秀玲 常小红 LI Leyi;CHANG Hong;GUAN Chong;TAO Yalin;SHEN Junjie;QUAN Chunyan;QIN Xiuling;CHANG Xiaohong(State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,CAS,Xi’an,710061;Xi’an Institute for Innovative Earth Environment Research,Xi’an,710061;CAS Center for Excellence in Quaternary Science and Global Change,Xi’an,710061;Institute of Tibetan Plateau research,Beijing,100101;University of Chinese Academy,Beijing,100049;Institute of Geology,China Earthquake Administration,Beijing,100029)

机构地区：[1]中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,西安710061 [2]西安地球环境创新研究院,西安710061 [3]中国科学院第四纪地质与全球变化卓越中心,西安710061 [4]中国科学院青藏高原研究所,北京100101 [5]中国科学院大学,北京100049 [6]中国地震局地质研究所,北京100029

出　　处：《地质论评》2021年第3期655-666,共12页Geological Review

基　　金：第二次青藏科考项目(编号:2019QZKK0707);黄土与第四纪地质国家重点实验室开放基金支持(编号:SKLLQG2030、SKLLQGPY1804)的成果。

摘　　要：青藏高原的构造隆升—生长过程及其资源环境效应是地球系统科学研究中的一个重要命题。其中,新生代青藏高原构造隆升过程与亚洲内陆干旱化之间的联系是研究的一个热点和难点。本文基于青藏高原从那曲到格尔木沿109国道现代地理要素和景观变化的证据以及大量器测数据和模拟结果讨论了青藏高原具体区域对亚洲内陆干旱化形成演化的重要影响,结果指出东昆仑山对印度季风继续深入内陆具有明显的阻挡作用,是一个重要的水汽屏障。同时本文结合东昆仑山晚渐新世以来主要构造隆升事件与亚洲内陆干旱化关键时间点的高度契合,进一步指出东昆仑山晚渐新世以来的构造隆升对亚洲内陆或者至少柴达木盆地的干旱化事件具有重要的影响,但是~3.6 Ma之后,北半球冰期对内陆盆地的干旱化的影响更大。Objectives:The tectonic uplift and growth process of the Xizang(Tibetan)Plateau and its resource and environmental effects are an important proposition in the scientific research of the earth system.Especially the link between the Xizang(Tibetan)Plateau uplift and the inner Asia aridification during the Cenozoic still stays a dispute question.In this paper,we will try to discuss and discriminate which part of the Xizang(Tibetan)Plateau has the most significant effect on the inner Asia aridification.Methods:Based on the present geographical and landscape change evidence from Naqu to Golmud along 109 national highway,the results of large-scale machine observations and simulations and present geological phenomenon in the east Kunlun Mountains to discuss the effects on the inner Asia aridification.Results:The east Kunlun Mountains have a significant blocking effect on the Indian monsoon going inland furtherly and it is an important moisture barrier.Conclusions:Combining the highly time consistent of the east Kunlun Mountains’tectonic uplift and the inland aridification as well as the present geographical and landscape change evidence from Naqu to Golmud,all indicate that tectonic uplift of the east Kunlun Mountains have an important impact on the inner Asia aridification or at least the Qaidam Basin aridification since the late Oligocene.However,the northern hemisphere glaciation since~3.6 Ma contributes much more to the aridification of the inner basins than the tectonic activities of the east Kunlun Mountains.

关 键 词：青藏高原 亚洲内陆干旱化 东昆仑 构造隆升 

分 类 号：P542[天文地球—构造地质学]