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Subduction initiation of the western Proto-Tethys Ocean: New evidence from the Cambrian intra-oceanic forearc ophiolitic melange in the western Kunlun Orogen, NW Tibetan Plateau

文献类型：期刊论文

作者Zhang, Qichao2; Zhong-Hai Li1; Wu, Zhenhan2; Chen, Xuanhua2; Zhang, Ji'en3; Yang, Yan2
刊名GEOLOGICAL SOCIETY OF AMERICA BULLETIN
出版日期2022
卷号134期号:1-2页码:145-159
ISSN号0016-7606
DOI10.1130/B35922.1
英文摘要The supra-subduction zone ophiolite or ophiolitic melange formed in the forearc setting is generally considered to be a key geological record for subduction initiation (SI) with petrological characteristics comparable to the SI-related rock sequence from forearc basalt (FAB) to boninite in the Izu-Bonin-Mariana subduction zone. Nevertheless, the standard FAB and boninite are generally difficult to observe in the forearc rocks generated during SI. Yet, a typical rock sequence indicating the SI of the western Proto-Tethys Ocean is reported for the first time in the Qimanyute intra-oceanic forearc system in the western Kunlun Orogen, Northwest Tibetan Plateau. The magmatic compositions, which range from less to more high field strength element (HFSE)-depleted and large ion lithophile element (LILE)-enriched, are changing from oceanic plagiogranites (ca. 494 Ma) to forearc basalt-like gabbros (FAB-Gs, ca. 487 Ma), boninites, and subsequent Nb-enriched gabbros (NEGs, ca. 485 Ma), which are thus consistent with the Izu-Bonin-Mariana forearc rocks as well as the Troodos and Semail supra-subduction zone-type ophiolites. The geochemical data from the chemostratigraphic succession indicate a subduction initiation process from a depleted mid-oceanic-ridge (MORB)-type mantle source with no detectable subduction input to gradual increasing involvement of subduction-derived materials (fluid/melts and sediments). The new petrological, geochemical, and geochronological data, combined with the regional geology, indicate that the well-sustained FAB-like intrusive magmas with associated boninites could provide crucial evidence for SI and further reveal that the SI of the western Proto-Tethys Ocean occurred in the Late Cambrian (494-485 Ma).
WOS关键词CALC-ALKALINE GRANITOIDS ; NB-ENRICHED BASALTS ; STRENGTH ELEMENT ENRICHMENT ; MAGMAS IMPLICATIONS ; TECTONIC EVOLUTION ; OMAN OPHIOLITE ; COSTA-RICA ; ORIGIN ; CHINA ; PETROGENESIS
资助项目Strategic Priority Research Program of the Chinese Academy of Sci-ences[XDA20070304] ; NSFC[91855208] ; NSFC[41774108] ; Fundamental Research Funds from the Chinese Academy of Geological Sciences[JKY1723] ; China Geological Survey Project[DD20190367]
WOS研究方向Geology
语种英语
WOS记录号WOS:000740439000001
出版者GEOLOGICAL SOC AMER, INC
资助机构Strategic Priority Research Program of the Chinese Academy of Sci-ences ; Strategic Priority Research Program of the Chinese Academy of Sci-ences ; NSFC ; NSFC ; Fundamental Research Funds from the Chinese Academy of Geological Sciences ; Fundamental Research Funds from the Chinese Academy of Geological Sciences ; China Geological Survey Project ; China Geological Survey Project ; Strategic Priority Research Program of the Chinese Academy of Sci-ences ; Strategic Priority Research Program of the Chinese Academy of Sci-ences ; NSFC ; NSFC ; Fundamental Research Funds from the Chinese Academy of Geological Sciences ; Fundamental Research Funds from the Chinese Academy of Geological Sciences ; China Geological Survey Project ; China Geological Survey Project ; Strategic Priority Research Program of the Chinese Academy of Sci-ences ; Strategic Priority Research Program of the Chinese Academy of Sci-ences ; NSFC ; NSFC ; Fundamental Research Funds from the Chinese Academy of Geological Sciences ; Fundamental Research Funds from the Chinese Academy of Geological Sciences ; China Geological Survey Project ; China Geological Survey Project ; Strategic Priority Research Program of the Chinese Academy of Sci-ences ; Strategic Priority Research Program of the Chinese Academy of Sci-ences ; NSFC ; NSFC ; Fundamental Research Funds from the Chinese Academy of Geological Sciences ; Fundamental Research Funds from the Chinese Academy of Geological Sciences ; China Geological Survey Project ; China Geological Survey Project
源URL[http://ir.iggcas.ac.cn/handle/132A11/103981]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Zhang, Qichao
作者单位1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Key Lab Computat Geodynam, Beijing 100049, Peoples R China
2.Chinese Acad Geol Sci, Beijing 100037, Peoples R China
3.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		 Zhang, Qichao,Zhong-Hai Li,Wu, Zhenhan,et al. Subduction initiation of the western Proto-Tethys Ocean: New evidence from the Cambrian intra-oceanic forearc ophiolitic melange in the western Kunlun Orogen, NW Tibetan Plateau[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2022,134(1-2):145-159.
APA Zhang, Qichao,Zhong-Hai Li,Wu, Zhenhan,Chen, Xuanhua,Zhang, Ji'en,&Yang, Yan.(2022).Subduction initiation of the western Proto-Tethys Ocean: New evidence from the Cambrian intra-oceanic forearc ophiolitic melange in the western Kunlun Orogen, NW Tibetan Plateau.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,134(1-2),145-159.
MLA Zhang, Qichao,et al."Subduction initiation of the western Proto-Tethys Ocean: New evidence from the Cambrian intra-oceanic forearc ophiolitic melange in the western Kunlun Orogen, NW Tibetan Plateau".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 134.1-2(2022):145-159.

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来源：地质与地球物理研究所

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