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Lajishankou Ophiolite Complex: Implications for Paleozoic Multiple Accretionary and Collisional Events in the South Qilian Belt

文献类型：期刊论文

作者Fu, Changlei1,2; Yan, Zhen2; Wang, Zongqi1; Buckman, Solomon3; Aitchison, Jonathan C.4; Niu, Manlan5; Cao, Bo2; Guo, Xianqing1; Li, Xiucai5; Li, Yunshuai6
刊名TECTONICS
出版日期2018-05-01
卷号37期号:5页码:1321-1346
ISSN号0278-7407
关键词Qilian Orogen ophiolite complex island arc arc-continent collision Proto-Tethyan Ocean
DOI10.1029/2017TC004740
英文摘要The Lajishan ophiolite complex in the Qilian Orogen is one of several ophiolites situated between the Qaidam and North China blocks that record episodic closure of the Proto-Tethyan Ocean. Detailed field relations and geochemical and geochronological studies are critical to unraveling the tectonic processes responsible for an extensive period of intraoceanic subduction that produced juvenile ophiolite/island arc terranes, which were obducted onto continental margins during ocean closure. The Lajishankou ophiolite complex crops out along the northern margin of the South Qilian belt and was thrust over a Neoproterozoic-Ordovician passive margin sequence that was deposited upon the Proterozoic Central Qilian block. The mafic rocks in Lajishankou ophiolite complex are the most abundant slices and can be categorized into three distinct groups based on petrological, geochemical, and geochronological characteristics: massive island arc tholeiites, 509-Ma back-arc dolerite dykes, and 491-Ma pillow basaltic and dolerite slices that are of seamount origin in a back-arc basin. These results, together with spatial relationships, indicate that the Cambrian island arc rocks, ophiolite complex, and accretionary complex developed between 530 and 480Ma as a single, intraoceanic arc-basin system as a result of south directed subduction of the Proto-Tethyan Ocean prior to Early Ordovician obduction of this system onto the Central Qilian block. Final continental amalgamation involved continental collision of the Central Qilian block with the Qaidam block during the Late Ordovician. This model solves the long-lasting discussion on the emplacement of the Lajishan ophiolite and contributes to an improved understanding of multiple accretionary and collisional processes in the Qilian Orogen.
WOS关键词MOHO TRANSITION ZONE ; BACK-ARC BASIN ; TIBETAN PLATEAU ; SUBDUCTION COMPONENTS ; MASS-SPECTROMETRY ; OMAN OPHIOLITE ; MARIANA TROUGH ; WESTERN KUNLUN ; NW CHINA ; OROGEN
资助项目Key China Geological Survey[DD20160201-04] ; Key China Geological Survey[DD20160022-02] ; National Natural Science Foundation of China[41702239] ; National Natural Science Foundation of China[41372207] ; National Natural Science Foundation of China[41272221] ; National Natural Science Foundation of China[41672221]
WOS研究方向Geochemistry & Geophysics
语种英语
出版者AMER GEOPHYSICAL UNION
WOS记录号WOS:000435815100008
资助机构Key China Geological Survey ; Key China Geological Survey ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key China Geological Survey ; Key China Geological Survey ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key China Geological Survey ; Key China Geological Survey ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key China Geological Survey ; Key China Geological Survey ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/88181]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Yan, Zhen
作者单位1.Chinese Acad Geol Sci, Inst Mineral Resources, MLR Key Lab Metallogeny & Mineral Assessment, Beijing, Peoples R China
2.Chinese Acad Geol Sci, Inst Geol, Beijing, Peoples R China
3.Univ Wollongong, Sch Earth & Environm Sci, GeoQuEST Res Ctr, Wollongong, NSW, Australia
4.Univ Queensland, Sch Earth & Environm Sci, Brisbane, Qld, Australia
5.Hefei Univ Technol, Dept Resources & Environm, Hefei, Anhui, Peoples R China
6.Tianjin Univ, Inst Surface Earth Syst Sci, Tianjin, Peoples R China
7.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Fu, Changlei,Yan, Zhen,Wang, Zongqi,et al. Lajishankou Ophiolite Complex: Implications for Paleozoic Multiple Accretionary and Collisional Events in the South Qilian Belt[J]. TECTONICS,2018,37(5):1321-1346.
APA Fu, Changlei.,Yan, Zhen.,Wang, Zongqi.,Buckman, Solomon.,Aitchison, Jonathan C..,...&Li, Jiliang.(2018).Lajishankou Ophiolite Complex: Implications for Paleozoic Multiple Accretionary and Collisional Events in the South Qilian Belt.TECTONICS,37(5),1321-1346.
MLA Fu, Changlei,et al."Lajishankou Ophiolite Complex: Implications for Paleozoic Multiple Accretionary and Collisional Events in the South Qilian Belt".TECTONICS 37.5(2018):1321-1346.

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来源：地质与地球物理研究所

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