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2018 Vol. 45, No. 2
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Article navigation > Geology in China > 2018 > 45(2): 351-366
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CAI Yitao, ZHANG Jie, DONG Zhongdou, CAO Zhengqi, XIAO Shuyue, LI Shuai, LI Chenkai, CHEN Lezhu, FAN Feipeng. 2018. Neoproterozoic basic magmatism in the north of Anhui Province: Evidence from whole-rock geochemistry and U-Pb geochronology of Diabase in Langan area[J]. Geology in China, 45(2): 351-366. doi: 10.12029/gc20180210
Citation: CAI Yitao, ZHANG Jie, DONG Zhongdou, CAO Zhengqi, XIAO Shuyue, LI Shuai, LI Chenkai, CHEN Lezhu, FAN Feipeng. 2018. Neoproterozoic basic magmatism in the north of Anhui Province: Evidence from whole-rock geochemistry and U-Pb geochronology of Diabase in Langan area[J]. Geology in China, 45(2): 351-366. doi: 10.12029/gc20180210
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Neoproterozoic basic magmatism in the north of Anhui Province: Evidence from whole-rock geochemistry and U-Pb geochronology of Diabase in Langan area

  • 1.

    The Nanjing Institute of Geology and Mineral Resources, Nanjing 210016, Jiangsu, China

  • 2.

    State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, Jiangsu, China

  • 3.

    School of Earth Sciences, China University of Geosciences, Wuhan 430074, Hubei, China

  • 4.

    The Second Institute of Hydrology and Engineering Geological Prospecting of Anhui Geological Prospecting Bureau, Wuhu 241000, Anhui, China

  • 5.

    Team 413 of Geology & Mineral Resources Development Bureau, Changde 415000, Hunan, China

  • 6.

    School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China

    • Fund Project: Supported by the Natural Science Foundation of China (No. 41402075) and China Geological Survey Program (No. 12120114054301)
More Information
  • Author Bio: CAI Yitao, born in 1982, male, doctor, research assistant, mainly engages in the study of diamond deposits; E-mail: ivan821129@163.com
  • Corresponding author: ZHANG Jie, born in 1980, female, doctor, senior engineer, mainly engages in the study of diamond deposits and remote sensing geology; E-mail: 3976618@qq.com 
Received Date:  30 July 2016
Revised Date:  23 March 2017
Publish Date:  25 April 2018
    Abstract

  • The mafic rock is exposed in North Anhui province of the East China. It consists of diabase, gabro-diabase and dabaseporphyrite. This paper presents a synthetic U-Pb isotopic study of zircons and a whole-rock geochemical study on diabase that were emplaced into the Proterozoic formations in the Langan area of the North Anhui province. The SHRIMP U-Pb zircon dating results indicate that the diabase were emplaced at ca.870-890 Ma. Geochemically, the diabase swarms are characterized by enriched in SiO2、CaO and (K2O < Na2O).It is therefore deduced that the diabases might belong to intraplate tholeiite occurring within the North China Plate. There are also show relative enrichment in LREE and LILE(Rb, Ba and La), a comparative enrichment in Cr and Ni, but a slight depletement in HFSE(Th, Nb, Ta, Zr and Hf).They are plotted in the within-plate tholeiite series on the tectonic discrimination diagrams. Taken together, these geochemical and isotopic data suggest that the primary magmas to form the diabase dykes in the Langan area could have been derived from a transitional mantle in the Mesoproterozoic, and were most probably emplaced under a continental margin extensional setting at ca.870-890 Ma. The results of this study demonstrate that the Neoproterozoic magmatism occurred at the Langan area of the North Anhui province, and created conditions for diamond mineralization. Taken along with the Neoproterozoic breakup of the Rodinia Supercontinent and the close relationship between the coeval magmatism and the hypothesis of a superplmue, it is reasonable to contribute the emplacement of the Neoproterozoic diabases in the Langan area to the geochemical fingerprints the contemporaneous mantle plume activity preserved in the continental margin of the North China Block.

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