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

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Science Bulletin 2005年第17期 98-108页

作者： SONG Chunhui1, GAO Dongling1,2, FANG Xiaomin3,1, CUI Zhijiu4, LI Jijun1, YANG Shengli3, JIN Hongbo1, Douglas Burbank5.& Joseph L. Kirschvink6.1. 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, Qing-hai 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,{16.,{15., pasadena, ca 9112., usa

The Kunlun Pass Basin, located in the middle of the eastern Kunlun Mountains, received relatively con-tinuous late Cenozoic sediments from the surrounding mountains, archiving great information to understand the deformation and uplift histories of the northern Tibetan Pla-teau. 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. How-ever, the ages used to constrict the events remain great un-certainty. Here, we present the results of detailed magneto-stratigraphy 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 to0.78 Ma. The lithology, sedimentary facies and lithofacies associations divide the basin into five stages of tectonosedimentary evolution, indi-cating the northern Tibetan Plateau having experienced five episodes of tectonic uplifts at3.6. 2.6.-2.5., 1.77, 1.2, 0.87 and0.78 Ma since the Pliocene.

关键词： magnetostratigraphy Kunlun Pass Basin Late Cenozoic Tibetan Plateau.

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