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Early Mesozoic retrograded eclogite and mafic granulite from the Badu Complex of the Cathaysia Block, South China: Petrology and tectonic implications

文献类型：期刊论文

作者Zhao, Lei1,2; Zhai, Mingguo1,3; Santosh, M.4,5; Zhou, Xiwen2
刊名GONDWANA RESEARCH
出版日期2017-02-01
卷号42页码:84-103
关键词Retrograded Eclogite Mafic Granulite Petrology And Phase Equilibria Tethyan Oceanic Domain Cathaysia Block
ISSN号1342-937X
DOI10.1016/j.gr.2016.10.002
文献子类Article
英文摘要The high-grade metamorphic terrane in the Badu region along the northeastern Cathaysia Block in South China preserves retrograded eclogites and mafic granulites. Here we present the petrology, mineral phase equilibria and P-T conditions based on pseudosection computations, as well as zircon U-Pb ages of these rocks. Mineral textures and reaction relationships suggest four metamorphic stages for the retrograded eclogite as follows: (1) eclogite facies stage (M1), (2) clinopyroxene retrograde stage (M2), (3) amphibole retrograde stage (M3), and (4) chlorite retrograde stage (M4). For the mafic granulite, three stages are identified as: (1) plagioclase-absent stage (M1), (2) granulite facies stage (M2) and (3) amphibolite facies stage (M3). Metamorphic evolution of both of the rock types follows clockwise P-T path. Conventional geothermometers and geobarometers in combination with phase equilibria modelling yield metamorphic P-T conditions for each metamorphic stage for the eclogite as 500-560 degrees C, 23-24 kbar (M1), 640-660 degrees C, 14-16 kbar (M2), 730-750 degrees C, and 11-13 kbar (M3). The chlorite retrograde stage (M4) is inferred to have occurred at lower amphibolite to greenschist facies conditions. Phase equilibria modelling of the mafic granulite shows P-T conditions for each metamorphic stage as 600-720 degrees C, >13 kbar (M1) and 860-890 degrees C, 5-6 kbar (M2) and M3 at amphibolite facies conditions. LA-ICPMS zircon U-Pb dating and trace element analysis show that the high pressure metamorphism occurred at 245-251 Ma. Protolith age of the mafic granulite is 997 Ma, similar to that of the mafic to ultramafic rocks widely distributed in the Cathaysia Block and also along the Jiangnan belt. Subduction of ancient oceanic lithospheric materials (or crustal thickening) during Mesozoic and formation of eclogites suggest that the Cathaysia Block was perhaps in the Tethyan oceanic domain at this time. The granulite formation might have been aided by Mesozoic mafic magma underplating associated with lithospheric delamination, heating and retrogression of the eclogite accompanied by rapid uplift. (C) 2016 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
WOS关键词HIGH-PRESSURE GRANULITES ; PB ZIRCON GEOCHRONOLOGY ; FLAT-SLAB SUBDUCTION ; A-TYPE GRANITES ; LU-HF ISOTOPES ; U-TH-PB ; NORTH CHINA ; ULTRAHIGH-PRESSURE ; METAMORPHIC ROCKS ; SOUTHWESTERN ZHEJIANG
WOS研究方向Geology
语种英语
WOS记录号WOS:000397873700006
出版者ELSEVIER SCIENCE BV
资助机构National Nature Science Foundation of China(41530208 ; National Nature Science Foundation of China(41530208 ; China Geological Survey(12120114064301 ; China Geological Survey(12120114064301 ; China Postdoctoral Science Foundation(2015M570147 ; China Postdoctoral Science Foundation(2015M570147 ; 41210003 ; 41210003 ; 121201102000150020 ; 121201102000150020 ; 2016T90133) ; 2016T90133) ; 41502182 ; 41502182 ; 12120115069501) ; 12120115069501) ; 41372196) ; 41372196) ; National Nature Science Foundation of China(41530208 ; National Nature Science Foundation of China(41530208 ; China Geological Survey(12120114064301 ; China Geological Survey(12120114064301 ; China Postdoctoral Science Foundation(2015M570147 ; China Postdoctoral Science Foundation(2015M570147 ; 41210003 ; 41210003 ; 121201102000150020 ; 121201102000150020 ; 2016T90133) ; 2016T90133) ; 41502182 ; 41502182 ; 12120115069501) ; 12120115069501) ; 41372196) ; 41372196) ; National Nature Science Foundation of China(41530208 ; National Nature Science Foundation of China(41530208 ; China Geological Survey(12120114064301 ; China Geological Survey(12120114064301 ; China Postdoctoral Science Foundation(2015M570147 ; China Postdoctoral Science Foundation(2015M570147 ; 41210003 ; 41210003 ; 121201102000150020 ; 121201102000150020 ; 2016T90133) ; 2016T90133) ; 41502182 ; 41502182 ; 12120115069501) ; 12120115069501) ; 41372196) ; 41372196) ; National Nature Science Foundation of China(41530208 ; National Nature Science Foundation of China(41530208 ; China Geological Survey(12120114064301 ; China Geological Survey(12120114064301 ; China Postdoctoral Science Foundation(2015M570147 ; China Postdoctoral Science Foundation(2015M570147 ; 41210003 ; 41210003 ; 121201102000150020 ; 121201102000150020 ; 2016T90133) ; 2016T90133) ; 41502182 ; 41502182 ; 12120115069501) ; 12120115069501) ; 41372196) ; 41372196)
源URL[http://ir.iggcas.ac.cn/handle/132A11/52999]  
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Zhou, Xiwen
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Chinese Acad Geol Sci, Inst Geol, 26 Baiwanzhuang Rd, Beijing 100037, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
4.China Univ Geosci, Sch Earth Sci & Resources, 29 Xueyuan Rd, Beijing 100083, Peoples R China
5.Univ Adelaide, Dept Earth Sci, Ctr Tecton Resources & Explorat, Adelaide, SA 5005, Australia
推荐引用方式
GB/T 7714		 Zhao, Lei,Zhai, Mingguo,Santosh, M.,et al. Early Mesozoic retrograded eclogite and mafic granulite from the Badu Complex of the Cathaysia Block, South China: Petrology and tectonic implications[J]. GONDWANA RESEARCH,2017,42:84-103.
APA Zhao, Lei,Zhai, Mingguo,Santosh, M.,&Zhou, Xiwen.(2017).Early Mesozoic retrograded eclogite and mafic granulite from the Badu Complex of the Cathaysia Block, South China: Petrology and tectonic implications.GONDWANA RESEARCH,42,84-103.
MLA Zhao, Lei,et al."Early Mesozoic retrograded eclogite and mafic granulite from the Badu Complex of the Cathaysia Block, South China: Petrology and tectonic implications".GONDWANA RESEARCH 42(2017):84-103.

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来源：地质与地球物理研究所

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