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Ca. 890 Ma magmatism in the northwest Yangtze block, South China: SIMS U-Pb dating, in-situ Hf-O isotopes, and tectonic implications

文献类型：期刊论文

作者Zhou, Jiu-Long1,2; Li, Xian-Hua1,2,3; Tang, Guo-Qiang1,2,3; Gao, Bing-Yu4; Bao, Zhi-An5; Ling, Xiao-Xiao1,2; Wu, Li-Guang1,3; Lu, Kai1,3; Zhu, Yu-Sheng1,2; Liao, Xin1,3
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2018
卷号151页码:101-111
关键词Early Neoproterozoic Lam-plate Mafic Intrusion Alkaline Igneous Complex Sims U-pb Apatite Dating High-delta O-18 Zircon Yangtze Block
ISSN号1367-9120
DOI10.1016/j.jseaes.2017.10.029
文献子类Article
英文摘要Early Neoproterozoic tectonics of the Yangtze block remains poorly understood because very limited igneous records are available from the time interval of similar to 1000-870 Ma. In this paper, our new SIMS U Pb dating results demonstrate that the Liushudian mafic intrusion and Pinghe alkaline complex in the northwest Yangtze block were emplaced at 888 +/- 6 Ma and 891 +/- 7 Ma, respectively, representing the products of a similar to 890 Ma igneous event. Gabbros from the Liushudian intrusion have rather depleted zircon epsilon Hf(t) (mean = 10.4) and normal mantle-like zircon delta O-18 (mean = 5.97 parts per thousand). Their parental magma was thus probably derived from asthenospheric mantle. Geochemically, these mafic rocks have an affinity to continental flood tholeiitic basalts rather than ocean island basalts, as previously thought. In contrast, an ijolite sample from the Pinghe complex has less depleted zircon epsilon Hf(t) (mean = 5.7) and anomalously high zircon and apatite delta O-18 (mean = 13.76 parts per thousand and 13.80 parts per thousand, respectively). Such a characteristic delta O-18 signal, among the highest yet known for igneous zircons, could be either inherited from a magma source in metasomatized lithospheric mantle or acquired by assimilation of high-delta O-18 supracrustal materials (e.g., limestone, chert) during magma evolution. An intra-plate extensional environment is suggested for the similar to 890 Ma igneous event in the northwest Yangtze block, although it is as yet unclear whether this igneous event is related to a mantle plume or not. It could be concluded that magmatism on the western periphery of the Yangtze block was not shut down between similar to 1000 and similar to 870 Ma, and the similar to 890 Ma intra-plate igneous event may mark either the onset of Neoproterozoic continental rifting or the ending of Late Mesoproterozoic to Early Neoproterozoic lithospheric extension.
WOS关键词BIMODAL VOLCANIC-ROCKS ; LARGE IGNEOUS PROVINCE ; ZIRCON U ; NORTHERN MARGIN ; CONTINENTAL-CRUST ; MANTLE PLUME ; BREAK-UP ; LITHOSPHERIC MANTLE ; CARBONATITE COMPLEX ; WORKING REFERENCE
WOS研究方向Geology
语种英语
WOS记录号WOS:000418974400009
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构Chinese Academy of Sciences(XDB18030300 ; Chinese Academy of Sciences(XDB18030300 ; Chinese Academy of Sciences(XDB18030300 ; Chinese Academy of Sciences(XDB18030300 ; Chinese Academy of Sciences(XDB18030300 ; Chinese Academy of Sciences(XDB18030300 ; Chinese Academy of Sciences(XDB18030300 ; Chinese Academy of Sciences(XDB18030300 ; National Natural Science Foundation of China(41703040) ; National Natural Science Foundation of China(41703040) ; National Natural Science Foundation of China(41703040) ; National Natural Science Foundation of China(41703040) ; National Natural Science Foundation of China(41703040) ; National Natural Science Foundation of China(41703040) ; National Natural Science Foundation of China(41703040) ; National Natural Science Foundation of China(41703040) ; China Postdoctoral Science Foundation(2016M600125) ; China Postdoctoral Science Foundation(2016M600125) ; China Postdoctoral Science Foundation(2016M600125) ; China Postdoctoral Science Foundation(2016M600125) ; 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National Natural Science Foundation of China(41703040) ; National Natural Science Foundation of China(41703040) ; China Postdoctoral Science Foundation(2016M600125) ; China Postdoctoral Science Foundation(2016M600125) ; China Postdoctoral Science Foundation(2016M600125) ; China Postdoctoral Science Foundation(2016M600125) ; China Postdoctoral Science Foundation(2016M600125) ; China Postdoctoral Science Foundation(2016M600125) ; China Postdoctoral Science Foundation(2016M600125) ; China Postdoctoral Science Foundation(2016M600125) ; QYZDY-SSW-DQC017) ; QYZDY-SSW-DQC017) ; QYZDY-SSW-DQC017) ; QYZDY-SSW-DQC017) ; QYZDY-SSW-DQC017) ; QYZDY-SSW-DQC017) ; QYZDY-SSW-DQC017) ; QYZDY-SSW-DQC017) ; Chinese Academy of Sciences(XDB18030300 ; Chinese Academy of Sciences(XDB18030300 ; Chinese Academy of Sciences(XDB18030300 ; Chinese Academy of Sciences(XDB18030300 ; Chinese Academy of Sciences(XDB18030300 ; Chinese Academy of Sciences(XDB18030300 ; Chinese Academy of Sciences(XDB18030300 ; Chinese Academy of Sciences(XDB18030300 ; 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源URL[http://ir.iggcas.ac.cn/handle/132A11/93150]  
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Li, Xian-Hua
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
5.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Shaanxi, Peoples R China
推荐引用方式
GB/T 7714		 Zhou, Jiu-Long,Li, Xian-Hua,Tang, Guo-Qiang,et al. Ca. 890 Ma magmatism in the northwest Yangtze block, South China: SIMS U-Pb dating, in-situ Hf-O isotopes, and tectonic implications[J]. JOURNAL OF ASIAN EARTH SCIENCES,2018,151:101-111.
APA Zhou, Jiu-Long.,Li, Xian-Hua.,Tang, Guo-Qiang.,Gao, Bing-Yu.,Bao, Zhi-An.,...&Liao, Xin.(2018).Ca. 890 Ma magmatism in the northwest Yangtze block, South China: SIMS U-Pb dating, in-situ Hf-O isotopes, and tectonic implications.JOURNAL OF ASIAN EARTH SCIENCES,151,101-111.
MLA Zhou, Jiu-Long,et al."Ca. 890 Ma magmatism in the northwest Yangtze block, South China: SIMS U-Pb dating, in-situ Hf-O isotopes, and tectonic implications".JOURNAL OF ASIAN EARTH SCIENCES 151(2018):101-111.

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来源：地质与地球物理研究所

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