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Variably evolved gabbroic intrusions within the Xigaze ophiolite (Tibet): new insights into the origin of ophiolite diversity
Liu, Tong1,2; Wu, Fu-Yuan1,2,3; Liu, Chuan-Zhou1,2,3,4; Tribuzio, Riccardo5; Ji, Wen-Bin1; Zhang, Chang1; Xu, Yang1; Zhang, Wei-Qi1
2018-11-01
发表期刊CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
ISSN0010-7999
卷号173期号:11页码:21
摘要Ophiolites worldwide show striking diversities in their rock assemblage and structure (i.e., ophiolite diversity), raising a question whether ophiolites are originally similar before intense tectonic dismemberment. Comparison between ophiolites and oceanic lithospheres at modern mid-ocean ridges may provide key constraints on the origin of ophiolite diversity, because oceanic lithospheric structures are inherently controlled by spreading rates. Here, we present a case study of the Xigaze ophiolite in southern Tibet focusing on its gabbroic intrusions outcropping in three localities, i.e., Dazhuqu, Baigang and Jiding. Compared to the Jiding sequence, the Dazhuqu and Baigang gabbroic rocks are less evolved, characterized by higher Cr2O3 contents but lower contents of TiO2 and rare earth element in both clinopyroxene and bulk compositions. It is evident, hence, that the Xigaze ophiolite is characterized by variably evolved and discontinuously distributed gabbroic intrusions, rather by a continuous lower oceanic crust between the mantle and sheeted dike complex as the Penrose-type ophiolites. Our study, along with the identification in previous studies of oceanic detachment faults within the Xigaze ophiolite, demonstrates that the Xigaze ophiolite shows close similarities to oceanic lithospheres at modern slow- and ultraslow-spreading ridges. Hence, the significant structural distinctions between the Xigaze ophiolite and the Penrose-type ophiolites (e.g., the Oman ophiolite) may be inherently associated with different spreading rates of paleo-ridges. Considering the limited scale of the Xigaze gabbroic rocks, here we suggest the Xigaze ophiolite as a typical representative of fossil ultraslow-spreading ridges.
关键词Gabbroic rock Xigaze ophiolite Tibet Spreading rate Ophiolite diversity
DOI10.1007/s00410-018-1518-6
资助者National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences from Chinese Academy of Sciences ; Key Research Program of Frontier Sciences from Chinese Academy of Sciences ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences from Chinese Academy of Sciences ; Key Research Program of Frontier Sciences from Chinese Academy of Sciences ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences from Chinese Academy of Sciences ; Key Research Program of Frontier Sciences from Chinese Academy of Sciences ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences from Chinese Academy of Sciences ; Key Research Program of Frontier Sciences from Chinese Academy of Sciences ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; Open Fund Project of State Key Laboratory of Lithospheric Evolution
关键词[WOS]ZANGBO SUTURE ZONE ; LOWER OCEANIC-CRUST ; MID-ATLANTIC RIDGE ; EAST PACIFIC RISE ; SLOW-SPREADING RIDGES ; ALPINE JURASSIC OPHIOLITES ; SOUTHWEST INDIAN RIDGE ; MELT-ROCK REACTION ; SOUTHERN TIBET ; MAGMA CHAMBER
语种英语
资助项目National Natural Science Foundation of China[41673038] ; National Natural Science Foundation of China[41521062] ; National Natural Science Foundation of China[41602054] ; Key Research Program of Frontier Sciences from Chinese Academy of Sciences[QYZDB-SSW-DQC032] ; Open Fund Project of State Key Laboratory of Lithospheric Evolution[K201707]
资助者National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences from Chinese Academy of Sciences ; Key Research Program of Frontier Sciences from Chinese Academy of Sciences ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences from Chinese Academy of Sciences ; Key Research Program of Frontier Sciences from Chinese Academy of Sciences ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences from Chinese Academy of Sciences ; Key Research Program of Frontier Sciences from Chinese Academy of Sciences ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences from Chinese Academy of Sciences ; Key Research Program of Frontier Sciences from Chinese Academy of Sciences ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; Open Fund Project of State Key Laboratory of Lithospheric Evolution
WOS研究方向Geochemistry & Geophysics ; Mineralogy
WOS类目Geochemistry & Geophysics ; Mineralogy
WOS记录号WOS:000448146100005
出版者SPRINGER
引用统计
文献类型期刊论文
条目标识符http://ir.iggcas.ac.cn/handle/132A11/89127
专题岩石圈演化国家重点实验室
通讯作者Liu, Tong
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
5.Univ Pavia, Dipartimento Sci Terra & Ambiente, Via Ferrata 1, I-27100 Pavia, Italy
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Liu, Tong,Wu, Fu-Yuan,Liu, Chuan-Zhou,et al. Variably evolved gabbroic intrusions within the Xigaze ophiolite (Tibet): new insights into the origin of ophiolite diversity[J]. CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,2018,173(11):21.
APA Liu, Tong.,Wu, Fu-Yuan.,Liu, Chuan-Zhou.,Tribuzio, Riccardo.,Ji, Wen-Bin.,...&Zhang, Wei-Qi.(2018).Variably evolved gabbroic intrusions within the Xigaze ophiolite (Tibet): new insights into the origin of ophiolite diversity.CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,173(11),21.
MLA Liu, Tong,et al."Variably evolved gabbroic intrusions within the Xigaze ophiolite (Tibet): new insights into the origin of ophiolite diversity".CONTRIBUTIONS TO MINERALOGY AND PETROLOGY 173.11(2018):21.
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