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Two Types of mafic rocks in southern Tibet: A mark of tectonic setting change from Neo-Tethyan oceanic crust subduction to Indian continental crust subduction

文献类型：期刊论文

作者Lei, Ming1,2,3; Chen, Jianlin4; Tan, Rongyu3,4; Huang, Sihua3,4
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2019-09-01
卷号181页码:11
关键词Eocene sodic OIB-like magmas Miocene potassic-ultrapotassic mafic rocks Neo-Tethyan oceanic crust subduction Indian continental crust subduction
ISSN号1367-9120
DOI10.1016/j.jseaes.2019.103883
英文摘要We collated existing data for the Eocene Langshan mafic rocks (Eocene mafic rocks) and the Miocene potassic c-ultrapotassic mafic rocks (Miocene mafic rocks) in southern Tibet to investigate the tectonic transition from Neo-Tethyan oceanic crust subduction to Indian continental crust subduction. The Eocene mafic rocks have high Na2O contents (K2O/Na2O = 0.03-0.2) and show OIB-like trace element patterns (e.g., positive Nb and Ta anomalies) and depleted radiogenic Sr-Nd isotope compositions (Sr-87/Sr-86 of apatite = 0.7031, epsilon Nd-(t) = +5.1 to +6.1). In contrast, the Miocene mafic rocks have high K2O contents (K2O/Na2O = 1.9-8.5) and exhibit arc like trace element patterns (enrichment in LILEs and depletion in HFSEs) and enriched radiogenic Sr-Nd isotope compositions (Sr-87/Sr-86 = 0.7115-0.7362, epsilon Nd-(t) = -16 to -12.4). The mantle source for the Eocene mafic rocks was generated by reactions between asthenospheric mantle wedge and felsic melts from subducted Neo-Tethyan oceanic crust (outside the field of rutile stability). In contrast, the mantle source of the Miocene mafic rocks was generated by reactions between asthenospheric (or lithospheric) mantle wedge and felsic melts from subducted Indian continental crust. Taking into account the regional tectonic evolution, we propose that break-off of the Neo-Tethyan oceanic slab and roll-back and/or break-off of the Indian continental slab were the most likely geodynamic mechanisms that led to the production of the Eocene and Miocene mafic rocks, respectively. Therefore, the transition from the Eocene to Miocene mafic rocks in southern Tibet provides an opportunity to understand the tectonic transition from Neo-Tethyan oceanic to Indian continental crust subduction.
WOS关键词ULTRAHIGH-PRESSURE METAMORPHISM ; LHASA TERRANE IMPLICATIONS ; U-PB AGES ; VOLCANIC-ROCKS ; ULTRAPOTASSIC ROCKS ; GEOCHEMICAL CONSTRAINTS ; ASIA COLLISION ; SLAB BREAKOFF ; ZIRCON GEOCHRONOLOGY ; ISOTOPIC CONSTRAINTS
资助项目National Key Research and Development Project of China[2016YFC0600305] ; Natural Science Foundation of China[41573024] ; Natural Science Foundation of China[41602341] ; Natural Science Foundation of China[41873037]
WOS研究方向Geology
语种英语
WOS记录号WOS:000482496600002
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/93557]  
专题地质与地球物理研究所_中国科学院新生代地质与环境重点实验室
通讯作者Lei, Ming
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, 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.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China
推荐引用方式
GB/T 7714		 Lei, Ming,Chen, Jianlin,Tan, Rongyu,et al. Two Types of mafic rocks in southern Tibet: A mark of tectonic setting change from Neo-Tethyan oceanic crust subduction to Indian continental crust subduction[J]. JOURNAL OF ASIAN EARTH SCIENCES,2019,181:11.
APA Lei, Ming,Chen, Jianlin,Tan, Rongyu,&Huang, Sihua.(2019).Two Types of mafic rocks in southern Tibet: A mark of tectonic setting change from Neo-Tethyan oceanic crust subduction to Indian continental crust subduction.JOURNAL OF ASIAN EARTH SCIENCES,181,11.
MLA Lei, Ming,et al."Two Types of mafic rocks in southern Tibet: A mark of tectonic setting change from Neo-Tethyan oceanic crust subduction to Indian continental crust subduction".JOURNAL OF ASIAN EARTH SCIENCES 181(2019):11.

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来源：地质与地球物理研究所

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