Cenozoic uplift of the Tibetan Plateau:Evidence from the tectonic-sedimentary evolution of the western Qaidam Basin

查看全文 作　　者：Yadong [1]Wang;Jianjing [1]Zheng;Weilin [2]Zhang;Shiyuan [3]Li;Xingwang [1]Liu;Xin [1]Yang;Yuhu [4]Liu

机构地区：[1]Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Donggang WestRoad No. 382, Lanzhou 730000, China;[2]Center for Basin Resource and Environment, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Post Box 2871, BeilinNorth Street 18, Beijing 100085, China;[3]Research Institute of Petroleum Exploration and Development, PetroChina Qinghai Oilfield Company, Dunhuang 736202, China;[4]Exploration and Development Academy of Northeast Petroleum Branch, China Petroleum & Chemical Corporation, Changchun 130061,China

出　　处：《Geoscience Frontiers》索引2012年第3卷第2期,共13页

基　　金：co-supposed by the Knowledge Innovation Program of the Chinese Academy of Sciences(No.KZCX2-EW-ON112);Open Fund of Key Laboratory of Petroleum Resources Research of the Chinese Academy of Sciences(No.KFJJ2010-07) 摘　　要：Geologists agree that the collision of the Indian and Asian plates caused uplift of the Tibet Plateau.However,controversy still exists regarding the modes and mechanisms of the Tibetan Plateau uplift.Geology has recorded this uplift well in the Qaidam Basin.This paper analyzes the tectonic and sedimentary evolution of the western Qaidam Basin using sub-surface seismic and drill data. The Cenozoic intensity and history of deformation in the Qaidam Basin have been reconstructed based on the tectonic developments,faults growth index,sedimentary facies variations,and the migration of the depositional depressions.The changes in the sedimentary facies show that lakes in the western Qaidam Basin had gone from inflow to still water deposition to withdrawal.Tectonic movements controlled deposition in various depressions,and the depressions gradually shifted southeastward.In addition,the morphology of the surface structures in the western Qaidam Basin shows that the Cenozoic tectonic movements controlled the evolution of the Basin and divided it into(a) the southern fault terrace zone, (b) a central Yingxiongling orogenic belt,and(c) the northern fold-thrust belt;divided by the XI fault (Youshi fault) and Youbei fault,respectively.The field data indicate that the western Qaidam Basin formed in a Cenozoic compressive tectonic environment caused by the India—Asia plate collision. Further,the Basin experienced two phases of intensive tectonic deformation.The first phase occurred during the Middle Eocene—Early Miocene(Xia Ganchaigou Fm.and Shang Ganchaigou Fm.,43.8—22 Ma),and peaked in the Early Oligocene(Upper Xia Ganchaigou Fm.,31.5 Ma).The second phase occurred between the Middle Miocene and the Present(Shang Youshashan Fm.and Qigequan Fm., 14.9—0 Ma),and was stronger than the first phase.The tectonic—sedimentary evolution and the orientation of surface structures in the western Qaidam Basin resulted from the Tibetan Plateau uplift,and recorded the periodic northward growth of the Plateau.Recognizing this early tectonic—sedimentary evolution supports the previous conclusion that northern Tibet responded to the collision between India and Asia shortly after its initiation.However,the current results reveal that northern Tibet also experienced another phase of uplift during the late Neogene.The effects of these two stages of tectonic activity combined to produce the current Tibetan Plateau. 关键词：柴达木盆地西部青藏高原隆升新生代构造沉积演化盆地构造证据亚洲板块断层生长指数

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Cenozoic uplift of the Tibetan Plateau:Evidence from the tectonic-sedimentary evolution of the western Qaidam Basin

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