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When did the subduction first initiate in the southern Paleo-Asian Ocean: New constraints from a Cambrian intra-oceanic arc system in West Junggar, NW China

文献类型：期刊论文

作者Ren, Rong1; Han, Bao-Fu1; Xu, Zhao1; Zhou, Yin-Zhang1; Liu, Bo1; Zhang, Lei1,2; Chen, Jia-Fu1,3; Su, Li4; Li, Jiao4; Li, Xian-Hua5
刊名EARTH AND PLANETARY SCIENCE LETTERS
出版日期2014-02-15
卷号388页码:222-236
关键词Intra-oceanic Arc Initial Subduction Early Paleozoic Ophiolite Paleo-asian Ocean West Junggar
ISSN号0012-821X
DOI10.1016/j.epsl.2013.11.055
文献子类Article
英文摘要We report here a Cambrian southward-subducting intra-oceanic arc system in the southern West Junggar, NW China, where an immature arc occurred initially on SSZ-type ophiolites and finally evolved into a more mature one. The immature arc is dominantly represented by Early-Middle Cambrian (similar to 510 Ma) low-K tholeiitic felsic rocks, whereas the mature arc is characterized by Late Cambrian (similar to 495 Ma) medium- and high-K calc-alkaline felsic and mafic rocks. The SSZ-type ophiolites show remarkable depletion of Nb and Ta and contain high-Cr spinel (Cr# > 0.6), resembling these formed in the forearc. Altogether, they record the initiation of subduction and transformation of crust during early subduction of the Paleo-Asian Ocean in the southern part of the Central Asian Orogenic Belt (CAOB). The subduction initiation might occur in the Early Cambrian (>515 Ma), as constrained by both the SSZ-type ophiolites (516 Ma) and the oldest arc plutons (515-509 Ma) that crosscut the ophiolites. The immature felsic plutons have high SiO2 (>72 wt%) contents and variable MgO (0.42-1.49 wt%) and Mg# values (22-62). Crustal anatexis may be responsible for the genesis of those plutons and thus the transformation from oceanic to continental crust. These results, combined with regional data, convincingly indicate that it is one of the oldest intra-oceanic arc systems in the southern CAOB, which may mark the initial subduction of the Paleo-Asian Ocean in its southern part, much later than those reported in the north. An archipelago-type model is proposed for the evolution of the southern West Junggar and has implications for the development of the southern part of the CAOB. (C) 2013 Elsevier B.V. All rights reserved.
WOS关键词IZU-BONIN ARC ; U-PB ; CONTINENTAL-CRUST ; TECTONIC EVOLUTION ; NORTH XINJIANG ; TRACE-ELEMENT ; ISLAND-ARC ; ISOTOPIC EVIDENCE ; RIDGE SUBDUCTION ; SR-ND
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000331502600022
出版者ELSEVIER SCIENCE BV
资助机构National Natural Science Foundation of China(41072168) ; National Natural Science Foundation of China(41072168) ; Ministry of Science and Technology of People's Republic of China(2007CB411305) ; Ministry of Science and Technology of People's Republic of China(2007CB411305) ; China Geological Survey(1212010611803 ; China Geological Survey(1212010611803 ; 1212010611817) ; 1212010611817) ; National Natural Science Foundation of China(41072168) ; National Natural Science Foundation of China(41072168) ; Ministry of Science and Technology of People's Republic of China(2007CB411305) ; Ministry of Science and Technology of People's Republic of China(2007CB411305) ; China Geological Survey(1212010611803 ; China Geological Survey(1212010611803 ; 1212010611817) ; 1212010611817) ; National Natural Science Foundation of China(41072168) ; National Natural Science Foundation of China(41072168) ; Ministry of Science and Technology of People's Republic of China(2007CB411305) ; Ministry of Science and Technology of People's Republic of China(2007CB411305) ; China Geological Survey(1212010611803 ; China Geological Survey(1212010611803 ; 1212010611817) ; 1212010611817) ; National Natural Science Foundation of China(41072168) ; National Natural Science Foundation of China(41072168) ; Ministry of Science and Technology of People's Republic of China(2007CB411305) ; Ministry of Science and Technology of People's Republic of China(2007CB411305) ; China Geological Survey(1212010611803 ; China Geological Survey(1212010611803 ; 1212010611817) ; 1212010611817)
源URL[http://ir.iggcas.ac.cn/handle/132A11/86278]  
专题中国科学院地质与地球物理研究所
通讯作者Han, Bao-Fu
作者单位1.Peking Univ, Sch Earth & Space Sci, Minist Educ, Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China
2.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
3.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
4.China Univ Geosci, Geol Lab Ctr, Beijing 100083, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Ren, Rong,Han, Bao-Fu,Xu, Zhao,et al. When did the subduction first initiate in the southern Paleo-Asian Ocean: New constraints from a Cambrian intra-oceanic arc system in West Junggar, NW China[J]. EARTH AND PLANETARY SCIENCE LETTERS,2014,388:222-236.
APA Ren, Rong.,Han, Bao-Fu.,Xu, Zhao.,Zhou, Yin-Zhang.,Liu, Bo.,...&Li, Qiu-Li.(2014).When did the subduction first initiate in the southern Paleo-Asian Ocean: New constraints from a Cambrian intra-oceanic arc system in West Junggar, NW China.EARTH AND PLANETARY SCIENCE LETTERS,388,222-236.
MLA Ren, Rong,et al."When did the subduction first initiate in the southern Paleo-Asian Ocean: New constraints from a Cambrian intra-oceanic arc system in West Junggar, NW China".EARTH AND PLANETARY SCIENCE LETTERS 388(2014):222-236.

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来源：地质与地球物理研究所

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