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题名: Tectonics of the North Qilian orogen, NW China
作者: Song, SG; Niu, YL; Su, L; Xia, XH
收录类别: SCIE ; ESI
ESI注释: 2017-07-19;Highly Cited Papers
出版日期: 2013-05
刊名: GONDWANA RESEARCH
卷号: 23, 期号:4, 页码:1378-1401
出版者: ELSEVIER
出版地: AMSTERDAM
英文摘要: The Qilian Orogen at the northern margin of the Tibetan Plateau is a type suture zone that recorded a complete history from continental breakup to ocean basin evolution, and to the ultimate continental collision in the time period from the Neoproterozoic to the Paleozoic. The Qilian Ocean, often interpreted as representing the "Proto-Tethyan Ocean", may actually be an eastern branch of the worldwide "Iapetus Ocean" between the two continents of Baltica and Laurentia, opened at >= 710 Ma as a consequence of breakup of supercontinent Rodinia. Initiation of the subduction in the Qilian Ocean probably occurred at similar to 520 Ma with the development of an Andean-type active continental margin represented by infant arc magmatism of similar to 517-490 Ma. In the beginning of Ordovician (similar to 490 Ma), part of the active margin was split from the continental Alashan block and the Andean-type active margin had thus evolved to western Pacific-type trench-arc-back-arc system represented by the MORB-like crust (i.e., SSZ-type ophiolite belt) formed in a back-arc basin setting in the time period of similar to 490-445 Ma. During this time, the subducting oceanic lithosphere underwent LT-HP metamorphism along a cold geotherm of similar to 6-7 degrees C/km. The Qilian Ocean was closed at the end of the Ordovician (similar to 445 Ma). Continental blocks started to collide and the northern edge of the Qilian-Qaidam block was underthrust/dragged beneath the Alashan block by the downgoing oceanic lithosphere to depths of similar to 100-200 km at about 435-420 Ma. Intensive orogenic activities occurred in the late Silurian and early Devonian in response to the exhumation of the subducted crustal materials. Briefly, the Qilian Orogen is conceptually a type example of the workings of plate tectonics from continental breakup to the development and evolution of an ocean basin, to the initiation of oceanic subduction and formation of arc and back-arc system, and to the final continental collision/subduction and exhumation. (C) 2012 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
关键词: Oceanic suture zone ; Ophiolite ; Arc and back-arc basin ; High-pressure metamorphism ; Subduction and collision ; Qilian Orogen
作者部门: [Song, Shuguang ; Xia, Xiaohong] Peking Univ, Sch Earth & Space Sci, MOE Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China ; [Niu, Yaoling] Lanzhou Univ, Sch Earth Sci, Lanzhou 730000, Peoples R China ; [Niu, Yaoling] Univ Durham, Dept Earth Sci, Durham DH1 3LE, England ; [Su, Li] China Univ Geosci, Geol Lab Ctr, Beijing 100083, Peoples R China
通讯作者: Song, SG (reprint author), Peking Univ, Sch Earth & Space Sci, MOE Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China.
学科分类: Geology
文章类型: Article
所属项目编号: Major State Basic Research Development Projects [2009CB825007] ; National Natural Science Foundation of China [40825007, 40821002, 40773012, 41130314, 91014003] ; Basic geological survey program of China Geological Survey [1212011121258, 1212010911070]
所属项目名称: 国家自然科学基金项目 ; 国家重点基础研究发展计划以及国家重大科学研究计划(973计划)
项目资助者: NSFC ; MOST
语种: 英语
DOI: 10.1016/j.gr.2012.02.004
ISSN号: 1342-937X
WOS记录号: WOS:000318258500010
第一机构:
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内容类型: 期刊论文
URI标识: http://ir.lzu.edu.cn/handle/262010/120624
Appears in Collections:地质科学与矿产资源学院_期刊论文

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Recommended Citation:
Song, SG,Niu, YL,Su, L,et al. Tectonics of the North Qilian orogen, NW China[J]. GONDWANA RESEARCH,2013,23(4):1378-1401.
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