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首页> 外文期刊>Geological Society of America Bulletin >Early Devonian (415-400 Ma) A-type granitoids and diabases in the Wuyishan, eastern Cathaysia: A signal of crustal extension coeval with the separation of South China from Gondwana
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Early Devonian (415-400 Ma) A-type granitoids and diabases in the Wuyishan, eastern Cathaysia: A signal of crustal extension coeval with the separation of South China from Gondwana

机译：早期的德文郡（415-400 mA）武夷山，东部东部武夷山的型造粒和糖尿病患者：从Gondwana分离南方的地壳延伸队

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摘要

The evolution of the South China continental crust and its linkage to the assembly and rifting of eastern Gondwana are key issues in the understanding of the early Paleozoic evolution of eastern Asia. We report U-Pb zircon ages and geochemical and Lu-Hf isotopic data for the South Fufang and Yingshang granitoids and the Mayuan diabases from the Wuyishan of eastern South China. The zircons yielded U-Pb ages of ca. 414-404 and ca. 409-401 Ma for the granitoids and diabases, respectively. Petrographic and geochemical features indicate that the granitoids are peraluminous A-type granites, expressed by high Ga/Al ratios and high Zr, Nb, Ce, Y, and rare earth element contents. They show negative zircon epsilon(Hf) (t) values (-15.4 to -5.8), consistent with the derivation from a crustal source. The granitoids likely originated from partial melting of dry granulite residues in the lower crust. The diabases show depletion in Ti, and negative correlations between FeOt and Mg#, and SiO2 and TiO2/FeOt, reflecting clinopyroxene, olivine, and Fe-Ti oxide fractionation. Their negative zircon epsilon(Hf)(t) values (-4.5 to -0.4) indicate an ancient enriched-mantle origin. The diabases likely originated from partial melting of a subcontinental lithospheric mantle. We interpret these A-type granitoids and diabases as postorogenic, formed during extensional collapse of thickened crust. Their generation indicates that South China experienced crustal extension during the Early Devonian. The extension occurred coevally with global rifting that led to the separation of the continental blocks of eastern Asia from eastern Gondwana, which was associated with the Early Devonian opening of the paleo-Tethys Ocean.
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    Xin Yujia; Li Jianhua; Ratschbacher Lothar; Zhao Guochun; Zhang Yueqiao; Dong Shuwen; Xia Xiao-Ping; Yu Yingqi;

  • 作者单位

    Chinese Acad Geol Sci Inst Geomech Beijing 100081 Peoples R China;

    Chinese Acad Geol Sci Inst Geomech Beijing 100081 Peoples R China;

    Tech Univ Bergakad Freiberg Geol D-09599 Freiberg Germany;

    Univ Hong Kong Dept Earth Sci Pokfulam Rd Hong Kong Peoples R China;

    Nanjing Univ State Key Lab Mineral Deposits Res Nanjing 210093 Peoples R China;

    Nanjing Univ State Key Lab Mineral Deposits Res Nanjing 210093 Peoples R China;

    Chinese Acad Sci Guangzhou Inst Geochem State Key Lab Isotope Geochem Guangzhou 510640 Peoples R China;

    Chinese Acad Geol Sci Inst Geomech Beijing 100081 Peoples R China;

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  • 正文语种 eng
  • 中图分类 地质学;
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