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引用本文:葛肖虹1 刘永江1 任收麦1,2. 青藏高原隆升动力学与阿尔金断裂[J]. 中国地质, 2002, (4): 346-350.
GE Xiao-hong1, LIU Yong-jiang1, REN Shou-mai1, 2. Uplift dynamics of the Qinghai-Tibet Plateau and Altun fault[J]. Geology in China, 2002, (4): 346-350(in Chinese with English abstract).
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青藏高原隆升动力学与阿尔金断裂
葛肖虹1 刘永江1 任收麦1,21,2
1.吉林大学地球科学学院,吉林 长春 130061;2.国土资源部油气资源战略研究中心,北京 100034
摘要:
提要:青藏高原最晚一期也是最强烈的一期隆升发生在1~0.8 Ma,与印度洋中脊三联点附近的“亚澳”陨击事件有关。陨击事件引起印度洋的快速扩张并导致印度板块在锡瓦利克带的强烈(A型)俯冲,正是这次俯冲引起了青藏高原及其外围山脉的快速隆升,中国西北的盆-山地貌因此而形成,其中东昆仑山推覆隆升近3000m,向北推挤近400km,是柴达木盆地、河西走廊新生界构造变形的主因。因此,“亚澳”陨击事件的影响,提供了青藏高原最晚一期隆升和中亚与中国西部大陆构造形成的大陆动力学背景;根据近年对阿尔金断裂带内同变形期新生矿物的激光微区40Ar/39Ar测年结果,阿尔金断裂走滑变形有可能起始于97~89Ma,它与喜马拉雅“西构造结”的形成(102~85Ma)近于同步,其累积错距达350~400km,晚白垩世—新生代同步错移了两侧原有的构造带和原型盆地,这为中国西部找矿、找油气的的战略评估提供了一个新的思路。
关键词:  青藏高原  隆升动力学  “亚澳”陨击事件  阿尔金断裂  同步错移
DOI:
分类号:
基金项目:国家自然科学基金项目(49772157)资助。
Uplift dynamics of the Qinghai-Tibet Plateau and Altun fault
GE Xiao-hong1, LIU Yong-jiang1, REN Shou-mai1, 21,2
1.College of Earth Sciences, Jilin University, Changchun 130061, China, China;2. Stratigraphic Research Center for Oil and Natural Gas, Ministry of Land and Resources, China
Abstract:
Abstract: The last-phase and strongest uplift of the Qinghai-Tibet plateau occurred at 1-0.8Ma BP, which was related to the Australasian meteorite impact event in the triple junction of the Indian Ocean ridge. The impact event resulted in rapid spreading of the Indian Ocean ridge and strong A-subduction of the Indian plate beneath the Siwalik. The strong subduction gave rise to the rapid uplift of the Qinghai-Tibet Plateau and its surrounding mountains, thus forming the basin-range geomorphology in western China. The eastern Kunlun Mountains were elevated approximately 3000 m by the thrust system and meanwhile moved ~ 400km to the north, which should be responsible for the Cenozoic deformation in the Qaidam basin and Hexi corridor. Therefore, this impact event can interpret the last phase of the uplift of the Qinghai-Tibet Plateau and geodynamic background of the formation of continental tectonics of western China. 40Ar/39Ar dating of neogenic minerals during deformation suggests that the strike-slip movement of the Altun (Altyn) fault may have started at 97-89Ma, occurring nearly synchronously with the formation of the "Western tectonic node" in the Nepal-western Kunlun area The Altun strike-slip fault has a cumulative offset of 350-400km and displaced the original tectonic belts and basins in the Late Cretaceous-Cenozoic, which provides a new idea for mineral, oil and natural gas searching in western China.
Key words:  Tibet-Qinghai Plateau  uplift dynamics  Australasian meteorite impact event  Altun fault  synchronous displacement