Late Cenozoic high-resolution magnetostratigraphy in the Kunlun Pass Basin and its implications for the uplift of the northern Tibetan Plateau

查看全文 作　　者：SONG [1]Chunhui;GAO [1,2]Dongling;FANG [3,1]Xiaomin;CUI [4]Zhijiu;LI [1]Jijun;YANG [3]Shengi;JIN [1]Hongbo;Douglas [5]Burbank;Joseph L. [6]Kirschvink 机构地区：[1]MOE Key Laboratory of Western China's Environmental Systems(Lanzhou University), Ministry of Education & College of Earth and Environment Sciences, Lanzhou University, Lanzhou 730000, China;[2]Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Qinghai 810008, China;[3]Institute of Tibetan Plateau Research, Chinese Academy of Sciences,Beijing 100085, China;[4]College of Environmental Sciences, Peking University, Beijing 100871,China;[5]Department of Geological Sciences, University of California, Santa Barbara,USA;[6]Paleomagnetics Laboratory, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA 出　　处：《Chinese Science Bulletin》索引2005年第50卷第17期,共11页 基　　金：This work was supported by the National Natu-ral Science Foundation of China(Grand Nos.40421101,40121303,40334038). 摘　　要：The Kunlun Pass Basin, located in the middle of the eastern Kunlun Mountains, received relatively continuous late Cenozoic sediments from the surrounding mountains, archiving great information to understand the deformation and uplift histories of the northern Tibetan Plateau. The Kunlun-Yellow River Movement, identified from the tectonomorphologic and sedimentary evolution of the Kunlun Pass Basin by Cui Zhijiu et al. (1997, 1998), is roughly coincident with many important global and Plateau climatic and environmental events, becoming a crucial time interval to understand tectonic-climatic interactions. However, the ages used to constrict the events remain great uncertainty. Here, we present the results of detailed magnetostratigraphy of the late Cenozoic sediments in the Kunlun Pass Basin, which show the basin sediments were formed between about 3.6 Ma and 0.5 Ma and the Kunlun-Yellow River Movement occurred at 1.2 to ~0.78 Ma. The lithology, sedimentary facies and lithofacies associations divide the basin into five stages of tectonosedimentary evolution, indicating the northern Tibetan Plateau having experienced five episodes of tectonic uplifts at ~3.6, 2.69-2.58, 1.77, 1.2, 0.87 and ~0.78 Ma since the Pliocene. 关 键 词：西藏高原 昆仑山脉 中生代后期 盆地 地质变化 地壳运动