GRANULITE-FACIES METAMORPHISM;
U-PB AGE;
SOUTH CHINA;
EAST ANTARCTICA;
SUPERCONTINENT CYCLES;
INDOSINIAN OROGENY;
CENTRAL VIETNAM;
HAINAN ISLAND;
NORTH CHINA;
PROTEROZOIC TECTONICS;
D O I:
10.2113/2022/4967935
中图分类号:
P3 [地球物理学];
P59 [地球化学];
学科分类号:
0708 ;
070902 ;
摘要:
The assembly-breakup of the Columbia/Nuna supercontinent is one of the most important issues in the Precambrian geology. The reconstruction of the Indochina Block in the Columbia supercontinent is poorly constrained by far, due to the deficiency of available geochronological and geochemical data for the exposed Precambrian rocks. The Mesoproterozoic plagioclase amphibolites in the Kontum Complex have significant implication for the reconstruction of the Indochina Block within the Columbia supercontinent. This study presents detailed petrological, zircon U-Pb geochronological and Lu-Hf isotopic, and whole -rock geochemical analyses for the plagioclase amphibolites. The plagioclase amphibolite protoliths were formed at -1432-1403 Ma and experienced metamorphism at 486-457 Ma, suggesting the preservation of a Mesoproterozoic basement in the Kontum Complex. The samples are strongly enriched in LREEs and LILEs but depleted in Nb, Ta, and Ti. They have relatively low (87Sr/86Sr)i ratios (from 0.705055 to 0.708728), positive & epsilon;Nd (t) values (from +2.6 to +2.8), and positive zircon & epsilon;Hf (t) values (from +9.9 to +17.1). Such signatures suggest that they were derived from a mantle wedge that has been metasomatized by sediment -derived melts in an arc setting and caused the breakup of the Columbia supercontinent. The Kontum Complex from the Indochina Block, along with Laurentia and East Antarctica, was distributed at the Columbian periphery.
机构:
China Geol Survey, Shenyang Geol Survey Ctr, Shenyang 110034, Peoples R China
China Geol Survey, Northeast Geol S&T Innovat Ctr, Shenyang 110034, Peoples R ChinaChina Geol Survey, Shenyang Geol Survey Ctr, Shenyang 110034, Peoples R China
Chen, Jingsheng
Tian, Yi
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机构:
Liaoning Geol & Mineral Survey Inst Co Ltd, Shenyang 110032, Peoples R ChinaChina Geol Survey, Shenyang Geol Survey Ctr, Shenyang 110034, Peoples R China
Tian, Yi
Gao, Zhonghui
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机构:
Inst Geol & Mineral Resources Liaoning Co Ltd, Shenyang 110029, Peoples R ChinaChina Geol Survey, Shenyang Geol Survey Ctr, Shenyang 110034, Peoples R China
Gao, Zhonghui
Li, Bin
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机构:
China Geol Survey, Shenyang Geol Survey Ctr, Shenyang 110034, Peoples R China
China Geol Survey, Northeast Geol S&T Innovat Ctr, Shenyang 110034, Peoples R ChinaChina Geol Survey, Shenyang Geol Survey Ctr, Shenyang 110034, Peoples R China
Li, Bin
Zhao, Chen
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机构:
China Geol Survey, Shenyang Geol Survey Ctr, Shenyang 110034, Peoples R China
China Geol Survey, Northeast Geol S&T Innovat Ctr, Shenyang 110034, Peoples R ChinaChina Geol Survey, Shenyang Geol Survey Ctr, Shenyang 110034, Peoples R China
Zhao, Chen
Li, Weiwei
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机构:
Inst Geol & Mineral Resources Liaoning Co Ltd, Shenyang 110029, Peoples R ChinaChina Geol Survey, Shenyang Geol Survey Ctr, Shenyang 110034, Peoples R China
Li, Weiwei
Zhang, Chao
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机构:
China Geol Survey, Shenyang Geol Survey Ctr, Shenyang 110034, Peoples R China
China Geol Survey, Northeast Geol S&T Innovat Ctr, Shenyang 110034, Peoples R ChinaChina Geol Survey, Shenyang Geol Survey Ctr, Shenyang 110034, Peoples R China
Zhang, Chao
Wang, Yan
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机构:
China Geol Survey, Shenyang Geol Survey Ctr, Shenyang 110034, Peoples R China
China Geol Survey, Northeast Geol S&T Innovat Ctr, Shenyang 110034, Peoples R ChinaChina Geol Survey, Shenyang Geol Survey Ctr, Shenyang 110034, Peoples R China
机构:
Univ Tokyo, Dept Earth Sci & Astron, Meguro Ku, 3-8-1 Komaba, Tokyo 1538902, JapanUniv Tokyo, Dept Earth Sci & Astron, Meguro Ku, 3-8-1 Komaba, Tokyo 1538902, Japan
Koshida, Keiko
Ishikawa, Akira
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机构:
Univ Tokyo, Dept Earth Sci & Astron, Meguro Ku, 3-8-1 Komaba, Tokyo 1538902, JapanUniv Tokyo, Dept Earth Sci & Astron, Meguro Ku, 3-8-1 Komaba, Tokyo 1538902, Japan
Ishikawa, Akira
Iwamori, Hikaru
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机构:
Japan Agcy Marine Earth Sci & Technol JAMSTEC, Geochem Evolut Res Program, 2-15 Natsushima Cho, Yokosuka, Kanagawa 2370061, JapanUniv Tokyo, Dept Earth Sci & Astron, Meguro Ku, 3-8-1 Komaba, Tokyo 1538902, Japan
Iwamori, Hikaru
Komiya, Tsuyoshi
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机构:
Univ Tokyo, Dept Earth Sci & Astron, Meguro Ku, 3-8-1 Komaba, Tokyo 1538902, JapanUniv Tokyo, Dept Earth Sci & Astron, Meguro Ku, 3-8-1 Komaba, Tokyo 1538902, Japan
机构:
Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R ChinaUniv Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China
Chen, Wei Terry
Zhou, Mei-Fu
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机构:
Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R ChinaUniv Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China
Zhou, Mei-Fu
Zhao, Xin-Fu
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机构:
Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China
China Univ Geosci, Fac Earth Resources, Wuhan 430074, Peoples R ChinaUniv Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China