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Petrogenesis of the Early-Middle Triassic high-Mg andesitic rocks in the southern margin of the South China Block: Implications for the convergence between the South China and Indochina Blocks
Xiang, Zhongjin1; Yang, Jinhui2; Yan, Quanren3; Xia, Lei4; Xia, Wenjing5; White, James D. L.6
2022-07-01
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
Volume232Pages:17
AbstractQuestions remain about whether the volcanic rocks and spatially associated mafic to intermediate intrusions in the Funing area, Southwestern China, are part of Emeishan large igneous province (ELIP) and formed in a plumerelated extensional setting. Zircon U-Pb ages, geochemical and Sr-Nd-Hf isotopic data are reported for these volcanic rocks, in order to investigate their source, petrogenesis and tectonic setting. Zircon U-Pb dating yields an eruption age of 246 +/- 2 Ma for the volcanic rocks, younger than that of the ELIP. They are calc-alkaline rocks, and are characterized by high MgO (>5 wt%) and Al2O3 contents at intermediate SiO2 contents (52.12-59.20 wt %), similar to those of high-Mg andesites, indicating a mantle source. They are enriched in large ion lithophile elements and light rare earth elements and are depleted in high field strength elements, with evidently negative Nb, Ta and Ti anomalies. They have relatively high Th/Nb and Th/La ratios and low Sr/Y and La/Yb ratios, with radiogenic initial Sr isotopic ratios (87Sr/86Sr i = 0.7080-0.7110) and negative epsilon Nd(t) (-8.8 to -6.5) and epsilon Hf(t) (-5.3 to -2.4) values. All of these geochemical features suggest that the Funing high-Mg andesitic rocks were derived from partial melting of an ancient, refractory lithospheric mantle that had been metasomatized by subducted sediment-derived fluids/melts before magma generation. In the context of other Early-Middle Triassic magmatism in the adjacent areas, we suggest that the Early-Middle Triassic volcanic rocks in the Funing area were generated in an arc setting, rather than by mantle plume-related melting. The spatial and temporal distribution of volcanic arc and the ophiolitic me ' lange in the China-Vietnam border region indicate Early to Middle Triassic northward subduction of the Babu (SW China)-Cao Bang (NE Vietnam) ocean basin beneath the southern margin of the South China Block.
KeywordHigh-Mg andesite Arc The Nanpanjiang basin South China Block Paleo-Tethys
DOI10.1016/j.jseaes.2021.104994
Funding OrganizationNational Young Science Foundation of China ; National Young Science Foundation of China ; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources ; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources ; China Geological Survey Project ; China Geological Survey Project ; National Young Science Foundation of China ; National Young Science Foundation of China ; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources ; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources ; China Geological Survey Project ; China Geological Survey Project ; National Young Science Foundation of China ; National Young Science Foundation of China ; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources ; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources ; China Geological Survey Project ; China Geological Survey Project ; National Young Science Foundation of China ; National Young Science Foundation of China ; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources ; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources ; China Geological Survey Project ; China Geological Survey Project
WOS KeywordSETOUCHI VOLCANIC BELT ; LARGE IGNEOUS PROVINCE ; ARC/BACK-ARC ASSEMBLAGES ; PLATE TECTONIC CYCLE ; PALEO-TETHYS OROGEN ; TRUONG SON BELT ; MA SUTURE ZONE ; U-TH-PB ; SW CHINA ; LU-HF
Language英语
Funding ProjectNational Young Science Foundation of China[41102141] ; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources[J1901-24] ; China Geological Survey Project[DD20160122-7]
Funding OrganizationNational Young Science Foundation of China ; National Young Science Foundation of China ; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources ; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources ; China Geological Survey Project ; China Geological Survey Project ; National Young Science Foundation of China ; National Young Science Foundation of China ; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources ; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources ; China Geological Survey Project ; China Geological Survey Project ; National Young Science Foundation of China ; National Young Science Foundation of China ; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources ; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources ; China Geological Survey Project ; China Geological Survey Project ; National Young Science Foundation of China ; National Young Science Foundation of China ; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources ; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources ; China Geological Survey Project ; China Geological Survey Project
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000809718900001
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/106087
Collection岩石圈演化国家重点实验室
Corresponding AuthorXiang, Zhongjin
Affiliation1.Chinese Acad Geol Sci, Inst Geol, 26 Baiwanzhuang St, Beijing 100037, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
4.Yunnan Univ, Res Ctr Earth Syst Sci, Kunming 650500, Peoples R China
5.Beihang Univ, Dept Student Affairs, Beijing 100191, Peoples R China
6.Univ Otago, Dept Geol, POB 56, Dunedin, New Zealand
Recommended Citation
GB/T 7714
Xiang, Zhongjin,Yang, Jinhui,Yan, Quanren,et al. Petrogenesis of the Early-Middle Triassic high-Mg andesitic rocks in the southern margin of the South China Block: Implications for the convergence between the South China and Indochina Blocks[J]. JOURNAL OF ASIAN EARTH SCIENCES,2022,232:17.
APA Xiang, Zhongjin,Yang, Jinhui,Yan, Quanren,Xia, Lei,Xia, Wenjing,&White, James D. L..(2022).Petrogenesis of the Early-Middle Triassic high-Mg andesitic rocks in the southern margin of the South China Block: Implications for the convergence between the South China and Indochina Blocks.JOURNAL OF ASIAN EARTH SCIENCES,232,17.
MLA Xiang, Zhongjin,et al."Petrogenesis of the Early-Middle Triassic high-Mg andesitic rocks in the southern margin of the South China Block: Implications for the convergence between the South China and Indochina Blocks".JOURNAL OF ASIAN EARTH SCIENCES 232(2022):17.
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