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The occurrence of Neoproterozoic low delta O-18 igneous rocks in the northwestern margin of the South China Block: Implications for the Rodinia configuration

文献类型：期刊论文

作者Wu, Peng1; Zhang, Shao-Bing1,2; Zheng, Yong-Fei1,2; Li, Qiu-Li3; Li, Zhen-Xin1; Sun, Fang-Yuan1
刊名PRECAMBRIAN RESEARCH
出版日期2020-09-01
卷号347页码:17
关键词Low delta O-18 igneous rocks Magmatic belt Neoproterozoic South China Rodinia
ISSN号0301-9268
DOI10.1016/j.precamres.2020.105841
英文摘要Low delta O-18 felsic igneous rocks are reported for the first time in the northwestern margin of the South China Block. Zircon U-Pb dating indicates that intermediate to felsic plutons were emplaced at 780 Ma and 750 Ma, respectively, and rhyolite was erupted at about 750 Ma. Compared with other rock-forming minerals that have variable delta O-18 values (- 2.3 parts per thousand to 8.7 parts per thousand for quartz; -5.4 parts per thousand to 6.3 parts per thousand for plagioclase, -7.6 parts per thousand to 2.5 parts per thousand for K-feldspar), zircon delta O-18 values mainly range from 1.0 parts per thousand to 4.7 parts per thousand with a few negative values of - 7.7 parts per thousand to - 2.9 parts per thousand. A two-stage O-18-depletion scenario was proposed, 1) high-temperature meteoric water-rock reaction in a continental rift setting, generating low delta O-18 melt from which precipitated zircons with significant lower delta O-18 values than normal mantle; 2) post-crystallization sub-solidus high-T meteoric-hydrothermal alteration, resulting in varying delta O-18 values for rock-forming minerals that leads to delta O-18-disequilibrium between zircon and other minerals. In addition, zircons from these rocks show positive epsilon(Hf)(t) values of 4.6 to 11.2 with Hf model ages of ca. 1.0-1.4 Ga, suggesting a magma source of juvenile crust due to mantle melting during the Grenvillian subduction of oceanic lithosphere in response to accretion of the South China Block to Rodinia in the Late Mesoproterozoic. The occurrence of low delta O-18 felsic rocks in the northwestern margin of the South China Block indicates the development of a low delta O-18 magmatic belt during the rifting of the South China Block away from Rodinia at about 750 Ma. The coeval occurrence of Neoproterozoic low delta O-18 magmatism in NW India, South China, Madagascar and Seychelles suggests a link between these continental blocks in the Rodinia configuration.
WOS关键词ZIRCON U-PB ; OXYGEN-ISOTOPE FRACTIONATION ; ULTRAHIGH-PRESSURE ECLOGITE ; PLASMA-MASS SPECTROMETRY ; LA-ICP-MS ; YANGTZE BLOCK ; NORTHERN MARGIN ; HYDROGEN ISOTOPE ; LOW-DELTA-O-18 RHYOLITES ; HYDROTHERMAL ALTERATION
资助项目Natural Science Foundation of China[41772187] ; Natural Science Foundation of China[41572168]
WOS研究方向Geology
语种英语
WOS记录号WOS:000561218200009
出版者ELSEVIER
资助机构Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/97643]  
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Zhang, Shao-Bing
作者单位1.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Peoples R China
2.Chinese Acad Sci, Ctr Excellence Comparat Planetol, Hefei 230026, Peoples R China
3.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		 Wu, Peng,Zhang, Shao-Bing,Zheng, Yong-Fei,et al. The occurrence of Neoproterozoic low delta O-18 igneous rocks in the northwestern margin of the South China Block: Implications for the Rodinia configuration[J]. PRECAMBRIAN RESEARCH,2020,347:17.
APA Wu, Peng,Zhang, Shao-Bing,Zheng, Yong-Fei,Li, Qiu-Li,Li, Zhen-Xin,&Sun, Fang-Yuan.(2020).The occurrence of Neoproterozoic low delta O-18 igneous rocks in the northwestern margin of the South China Block: Implications for the Rodinia configuration.PRECAMBRIAN RESEARCH,347,17.
MLA Wu, Peng,et al."The occurrence of Neoproterozoic low delta O-18 igneous rocks in the northwestern margin of the South China Block: Implications for the Rodinia configuration".PRECAMBRIAN RESEARCH 347(2020):17.

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来源：地质与地球物理研究所

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