中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 地质与地球物理研究所
  3. 中国科学院地质与地球物理研究所
  4. 岩石圈演化国家重点实验室
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

文献类型：期刊论文

作者Xiang, Zhongjin2; Yang, Jinhui6; Yan, Quanren1; Xia, Lei5; Xia, Wenjing4; White, James D. L.3
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2022-07-01
卷号232页码:17
ISSN号1367-9120
关键词High-Mg andesite Arc The Nanpanjiang basin South China Block Paleo-Tethys
DOI10.1016/j.jseaes.2021.104994
英文摘要Questions 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.
WOS关键词SETOUCHI 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
资助项目National 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]
WOS研究方向Geology
语种英语
出版者PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号WOS:000809718900001
资助机构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 ; 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
源URL[http://ir.iggcas.ac.cn/handle/132A11/106087]  
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Xiang, Zhongjin
作者单位1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
2.Chinese Acad Geol Sci, Inst Geol, 26 Baiwanzhuang St, Beijing 100037, Peoples R China
3.Univ Otago, Dept Geol, POB 56, Dunedin, New Zealand
4.Beihang Univ, Dept Student Affairs, Beijing 100191, Peoples R China
5.Yunnan Univ, Res Ctr Earth Syst Sci, Kunming 650500, Peoples R China
6.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
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.

入库方式： OAI收割

来源：地质与地球物理研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。