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Integrated Zircon U-Pb-O-Hf and Whole-Rock Sm-Nd Studies of Paleozoic Amphibolites in the Chencai Area of the Cathaysia Block, South China
Zhao, Lei1,2; Liu, Bo1,3; Nutman, Allen P.2; Zhai, Mingguo1,4; Zhou, Xiwen5; Cui, Xiahong1,3
2018-11-01
发表期刊JOURNAL OF GEOLOGY
ISSN0022-1376
卷号126期号:6页码:621-637
摘要The present metamorphic crystalline basement of the South China Block was formed largely as a result of the early Paleozoic (similar to 460-410 Ma) orogeny, which affected large areas of this continental block. Paleozoic metamafic rocks (garnet amphibolites) with typical normal mid-ocean ridge basalt chemical compositions were recently identified from an uplifted lower-crustal rock assemblage in the Chencai area of the Cathaysia Block. This article focuses on the first integrated studies of secondary-ion mass spectroscopy (SIMS) zircon U-Pb dating and zircon Lu-Hf-O and whole-rock Sm-Nd isotopic analyses on these metamafic rocks, for the purpose of better constraining the ancient geodynamic processes of this orogeny. The SIMS zircon U-Pb dating results show that these mafic rocks underwent high-grade metamorphismat similar to 427 Ma, within the time span of Paleozoic orogeny. Most zircon Lu-Hf and O isotopic results display relatively uniform compositions, with delta O-18 values scattering around +9 parts per thousand and the calculated epsilon(Hf)(t) values of most metamorphic zircons ranging from +9.8 to +15.1. The Nd-143/Nd-144 and Sm-147/Nd-144 ratios of the three samples are 0.513075-0.513103 and 0.20508-0.205832, respectively. The epsilon(Nd)(t) values are high positive, ranging from +8.05 to +8.63. These ratios resemble those of basaltic rocks newly derived from a depleted-mantle source. Zircon Hf model ages are similar to 540 Ma, older than the previous result of similar to 496 Ma, suggesting that these newly formed crustal materials were likely extracted from the depleted-mantle source during the early Paleozoic. It is thus inferred from such isotopic characteristics, as well as previously published data of the metamafic rocks, that the previous notion-that a deep lithospheric fracture reaching asthenospheric mantle was absent from the Early Paleozoic South China Orogen-should be reconsidered.
DOI10.1086/699927
资助者National Nature Science Foundation of China ; National Nature Science Foundation of China ; China Geological Survey ; China Geological Survey ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Scholarship Council ; China Scholarship Council ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; China Geological Survey ; China Geological Survey ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Scholarship Council ; China Scholarship Council ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; China Geological Survey ; China Geological Survey ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Scholarship Council ; China Scholarship Council ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; China Geological Survey ; China Geological Survey ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Scholarship Council ; China Scholarship Council
关键词[WOS]NEOPROTEROZOIC TECTONIC EVOLUTION ; IONIZATION MASS-SPECTROMETRY ; JIANGNAN OROGEN ; LU-HF ; VOLCANIC-ROCKS ; CONTINENTAL COLLISION ; SOUTHEASTERN CHINA ; KWANGSIAN OROGENY ; MAFIC INTRUSIONS ; FACIES ZIRCONS
语种英语
资助项目National Nature Science Foundation of China[41502182] ; National Nature Science Foundation of China[41530208] ; National Nature Science Foundation of China[41210003] ; National Nature Science Foundation of China[41372196] ; China Geological Survey[1212010811048] ; China Geological Survey[12120114064301] ; China Postdoctoral Science Foundation[2016T90133] ; China Scholarship Council[201604910053]
资助者National Nature Science Foundation of China ; National Nature Science Foundation of China ; China Geological Survey ; China Geological Survey ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Scholarship Council ; China Scholarship Council ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; China Geological Survey ; China Geological Survey ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Scholarship Council ; China Scholarship Council ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; China Geological Survey ; China Geological Survey ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Scholarship Council ; China Scholarship Council ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; China Geological Survey ; China Geological Survey ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Scholarship Council ; China Scholarship Council
WOS研究方向Geology
WOS类目Geology
WOS记录号WOS:000449866400004
出版者UNIV CHICAGO PRESS
引用统计
文献类型期刊论文
条目标识符http://ir.iggcas.ac.cn/handle/132A11/89427
专题岩石圈演化国家重点实验室
通讯作者Zhao, Lei
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Univ Wollongong, Sch Earth & Environm Sci, GeoQuEST Res Ctr, Wollongong, NSW 2522, Australia
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Univ Chinese Acad Sci, Key Lab Computat Geodynam, Beijing 100049, Peoples R China
5.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
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Zhao, Lei,Liu, Bo,Nutman, Allen P.,et al. Integrated Zircon U-Pb-O-Hf and Whole-Rock Sm-Nd Studies of Paleozoic Amphibolites in the Chencai Area of the Cathaysia Block, South China[J]. JOURNAL OF GEOLOGY,2018,126(6):621-637.
APA Zhao, Lei,Liu, Bo,Nutman, Allen P.,Zhai, Mingguo,Zhou, Xiwen,&Cui, Xiahong.(2018).Integrated Zircon U-Pb-O-Hf and Whole-Rock Sm-Nd Studies of Paleozoic Amphibolites in the Chencai Area of the Cathaysia Block, South China.JOURNAL OF GEOLOGY,126(6),621-637.
MLA Zhao, Lei,et al."Integrated Zircon U-Pb-O-Hf and Whole-Rock Sm-Nd Studies of Paleozoic Amphibolites in the Chencai Area of the Cathaysia Block, South China".JOURNAL OF GEOLOGY 126.6(2018):621-637.
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