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  4. 岩石圈演化国家重点实验室
Integrated in situ U-Pb age and Hf-O analyses of zircon from Suixian Group in northern Yangtze: New insights into the Neoproterozoic low-delta O-18 magmas in the South China Block

文献类型：期刊论文

作者Yang, Ya-Nan1,2; Wang, Xuan-Ce3,4; Li, Qiu-Li1; Li, Xian-Hua1
刊名PRECAMBRIAN RESEARCH
出版日期2016-02-01
卷号273页码:151-164
关键词Zircon Low-delta O-18 magma U Pb age Lu-Hf isotopes South China Neoproterozoic
DOI10.1016/j.precamres.2015.12.008
文献子类Article
英文摘要The mid-to late-Neoproterozoic magmatic rocks from the northern margin of the Yangtze Block are major protoliths of high-pressure (HP) and ultrahigh-pressure (UHP) metamorphic rocks in the Dabie-Sulu orogenic belt along the northern margin of the South China Block. Oxygen isotopic compositions of these mid-to late-Neoproterozoic magmatic rocks hold a key to understanding the origin of large-scale O-18-depletion in the HP and UHP metamorphic rocks. We report here the integrated in situ U-Pb dating and Hf-O isotope analyses of zircon grains from sedimentary and volcanic rocks in the Neoproterozoic Suixian Group along the northern margin of the Yangtze Block, South China. This study shows that the Suixian Group was deposited at 740-720 Ma, corresponding to late stage of the second deposition cycle (820-720 Ma) of the Neoproterozoic deposition in the Yangtze Block. Detrital zircon grains from the Suixian Group display age peaks at 0.73-0.74 Ga, 0.79 Ga, and 2.0 Ga. Zircon U-Pb ages together with Hf-O isotopic compositions indicate provenance of the Suixian Group dominantly from the proximal Neoproterozoic igneous rocks with possible contribution from Paleoproterozoic rocks along the northern margin of the South China Block. Zircon delta O-18 values from the Suixian Group have a large range from 10.5 parts per thousand to 13 parts per thousand. Zircon grains with negative delta O-18 values, typical index of magma-meteoric water interaction, were not identified in this study. The major phase of low-delta O-18 magmas (delta O-18(zircon) <4.6 parts per thousand) initiated at ca. 800 Ma, long before the first glaciation event arising at about 716 Ma in the South China Block, and lasted for over 100 m.y. The epsilon(Hf)(t) values of the low-delta O-18 zircon grains from the Suixian Group range between -15.5 and 10.7. About 74 percent of low-delta O-18 zircon grains have negative epsilon(Hf)(t) values varying from-15.5 to 0. This strongly argues against the possibility that the low-delta O-18 magma was generated dominantly by partial melting of high-T hydrothermally altered oceanic lower crust. This study emphasizes that high-T water-rock interaction and continental rifting tectonic setting are essential to produce the abundant low-delta O-18 magmas, and confirms that most of negative delta O-18 signature identified in zircon grains from HP and UHP metamorphic rocks may not have been inherited from their Neoproterozoic protoliths. (C) 2015 Elsevier B.V. All rights reserved.
WOS关键词PRESSURE METAMORPHIC ROCKS ; SNAKE RIVER PLAIN ; OXYGEN-ISOTOPE SIGNATURE ; GA CONTINENTAL-CRUST ; A-TYPE GRANITES ; TECTONIC EVOLUTION ; VOLCANIC-ROCKS ; TRACE-ELEMENT ; SE CHINA ; PERALUMINOUS GRANITOIDS
WOS研究方向Geology
语种英语
WOS记录号WOS:000369198400009
资助机构National Basic Research Program of China (973 Program)(2013CB835005) ; National Basic Research Program of China (973 Program)(2013CB835005) ; National Basic Research Program of China (973 Program)(2013CB835005) ; National Basic Research Program of China (973 Program)(2013CB835005) ; Natural Science Foundation of China(41222023) ; Natural Science Foundation of China(41222023) ; Natural Science Foundation of China(41222023) ; Natural Science Foundation of China(41222023) ; Australian Research Council (ARC)(FT140100826) ; Australian Research Council (ARC)(FT140100826) ; Australian Research Council (ARC)(FT140100826) ; Australian Research Council (ARC)(FT140100826) ; National Basic Research Program of China (973 Program)(2013CB835005) ; National Basic Research Program of China (973 Program)(2013CB835005) ; National Basic Research Program of China (973 Program)(2013CB835005) ; National Basic Research Program of China (973 Program)(2013CB835005) ; Natural Science Foundation of China(41222023) ; Natural Science Foundation of China(41222023) ; Natural Science Foundation of China(41222023) ; Natural Science Foundation of China(41222023) ; Australian Research Council (ARC)(FT140100826) ; Australian Research Council (ARC)(FT140100826) ; Australian Research Council (ARC)(FT140100826) ; Australian Research Council (ARC)(FT140100826)
源URL[http://ir.iggcas.ac.cn/handle/132A11/62085]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Curtin Univ, Dept Appl Geol, Inst Geosci Res TIGeR, GPO Box U1987, Perth, WA 6845, Australia
4.Changan Univ, Sch Earth Sci & Resources, Xian 710054, Peoples R China
推荐引用方式
GB/T 7714		 Yang, Ya-Nan,Wang, Xuan-Ce,Li, Qiu-Li,et al. Integrated in situ U-Pb age and Hf-O analyses of zircon from Suixian Group in northern Yangtze: New insights into the Neoproterozoic low-delta O-18 magmas in the South China Block[J]. PRECAMBRIAN RESEARCH,2016,273:151-164.
APA Yang, Ya-Nan,Wang, Xuan-Ce,Li, Qiu-Li,&Li, Xian-Hua.(2016).Integrated in situ U-Pb age and Hf-O analyses of zircon from Suixian Group in northern Yangtze: New insights into the Neoproterozoic low-delta O-18 magmas in the South China Block.PRECAMBRIAN RESEARCH,273,151-164.
MLA Yang, Ya-Nan,et al."Integrated in situ U-Pb age and Hf-O analyses of zircon from Suixian Group in northern Yangtze: New insights into the Neoproterozoic low-delta O-18 magmas in the South China Block".PRECAMBRIAN RESEARCH 273(2016):151-164.

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来源：地质与地球物理研究所

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