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  4. 中国科学院矿产资源研究重点实验室
Genetically and geochronologically contrasting plagiogranites in South Central Tianshan ophiolitic melange: Implications for the breakup of Rodinia and subduction zone processes

文献类型：期刊论文

作者Jiang, Tuo1,2; Gao, Jun1; Klemd, Reiner3; Qian, Qing1; Zhang, Xi4; Wang, Xinshui1,2; Tan, Zhou1,2; Zhu, Zhixin5
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2015-12-01
卷号113页码:266-281
关键词Geochemistry Geochronology Plagiogranite South Central Tianshan Ophiolitic Melange Subduction Rodinia
DOI10.1016/j.jseaes.2014.10.015
文献子类Article
英文摘要Plagiogranites are exposed as exotic blocks at two localities (Wuwamen and Guluogou) in the South Central Tianshan ophiolitic melange and have U-Pb zircon ages of 775 +/- 11 Ma and 416 +/- 4 Ma, respectively. The Wuwamen plagiogranites have low-K tholeiitic to medium-K calc-alkaline and weakly peraluminous compositions. They further display relatively low concentrations of total rare earth elements (REEs), pronounced positive Eu anomalies and distinct depletions of P and Ti. The trace element characteristics, whole-rock initial Sr-87/Sr-86 ratios from 0.708812 to 0.708839 and negative epsilon(Nd)(t) values from -6.4 to -6.2 suggest that the granitic magma was derived from low degree partial melting of amphibolites at middle to lower crustal levels with hornblende as the dominant residual phase. In contrast, the Guluogou plagiogranites are strongly peraluminous and are characterized by an enrichment of both large ion lithophile elements (LILEs) and light rare earth elements (LREEs). Negative anomalies of Nb, Ta, P and Ti are in accordance with the geochemical signature of Andean arc-type granites. The zircon epsilon(Hf)(t) values from -6.1 to +2.4, the corresponding two-stage Hf model ages (T-DM(C) = 1259-1798 Ma) and the epsilon(Nd)(t) values from -5.0 to -2.9 favor partial melting of ancient continental crust, which was contaminated by some juvenile material from a depleted-mantle wedge, for the origin of the Guluogou plagiogranites. Thus, we conclude that the Wuwamen and Guluogou plagiogranites have no direct genetic relationship with the ophiolites and occur as exotic blocks in the ophiolitic melanges. It is further suggested that the 775 Ma Wuwamen plagiogranites originated during the breakup of Rodinia, whereas the 416 Ma Guluogou plagiogranites were generated in an Andean-type active continental margin environment related to the northward subduction of the South Tianshan Ocean. (c) 2014 Elsevier Ltd. All rights reserved.
WOS关键词U-PB GEOCHRONOLOGY ; PALEOZOIC TECTONIC EVOLUTION ; ASIAN OROGENIC BELT ; NORTHEASTERN TARIM BLOCK ; ND ISOTOPIC EVIDENCE ; LU-HF ISOTOPE ; NW-CHINA ; WESTERN TIANSHAN ; VOLCANIC-ROCKS ; CRUSTAL GROWTH
WOS研究方向Geology
语种英语
WOS记录号WOS:000367406200018
资助机构National Natural Science Foundation of China(41390445 ; National Natural Science Foundation of China(41390445 ; China Geological Survey(12120113093900) ; China Geological Survey(12120113093900) ; Deutsche Forschungsgemeinschaft(KL 692/17-2 ; Deutsche Forschungsgemeinschaft(KL 692/17-2 ; IGCP Project(592) ; IGCP Project(592) ; 41025008) ; 41025008) ; KL 692/17-3) ; KL 692/17-3) ; National Natural Science Foundation of China(41390445 ; National Natural Science Foundation of China(41390445 ; China Geological Survey(12120113093900) ; China Geological Survey(12120113093900) ; Deutsche Forschungsgemeinschaft(KL 692/17-2 ; Deutsche Forschungsgemeinschaft(KL 692/17-2 ; IGCP Project(592) ; IGCP Project(592) ; 41025008) ; 41025008) ; KL 692/17-3) ; KL 692/17-3)
源URL[http://ir.iggcas.ac.cn/handle/132A11/62119]  
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
作者单位1.Chinese Acad Sci, Key Lab Mineral Resources, Inst Geol & Geophys, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Univ Erlangen Nurnberg, GeoZentrum Nordbayern, D-91054 Erlangen, Germany
4.China Minmet Corp, Beijing 100010, Peoples R China
5.Xinjiang Acad Geol Survey, Urumqi 830010, Peoples R China
推荐引用方式
GB/T 7714		 Jiang, Tuo,Gao, Jun,Klemd, Reiner,et al. Genetically and geochronologically contrasting plagiogranites in South Central Tianshan ophiolitic melange: Implications for the breakup of Rodinia and subduction zone processes[J]. JOURNAL OF ASIAN EARTH SCIENCES,2015,113:266-281.
APA Jiang, Tuo.,Gao, Jun.,Klemd, Reiner.,Qian, Qing.,Zhang, Xi.,...&Zhu, Zhixin.(2015).Genetically and geochronologically contrasting plagiogranites in South Central Tianshan ophiolitic melange: Implications for the breakup of Rodinia and subduction zone processes.JOURNAL OF ASIAN EARTH SCIENCES,113,266-281.
MLA Jiang, Tuo,et al."Genetically and geochronologically contrasting plagiogranites in South Central Tianshan ophiolitic melange: Implications for the breakup of Rodinia and subduction zone processes".JOURNAL OF ASIAN EARTH SCIENCES 113(2015):266-281.

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来源：地质与地球物理研究所

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