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首页> 外文期刊>Journal of Asian earth sciences >Zircon U-Pb age, Hf isotopic compositions and geochemistry of the Silurian Fengdingshan Ⅰ-type granite Pluton and Taoyuan mafic-felsic Complex at the southeastern margin of the Yangtze Block
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Zircon U-Pb age, Hf isotopic compositions and geochemistry of the Silurian Fengdingshan Ⅰ-type granite Pluton and Taoyuan mafic-felsic Complex at the southeastern margin of the Yangtze Block

机译：扬子地块东南缘志留系凤顶山Ⅰ型花岗岩岩体和桃园镁铁质-长相复合体的锆石U-Pb年龄，Hf同位素组成和地球化学

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摘要

This work presents an integrated study of zircon U-Pb ages and Hf isotope along with whole-rock geochemistry on Silurian Fengdingshan I-type granites and Taoyuan mafic-felsic intrusive Complex located at the southeastern margin of the Yangtze Block, filling in a gap in understanding of Paleozoic Ⅰ-type granites and mafic-intermediate igneous rocks in the eastern South China Craton (SCC). The Fengdingshan granite and Taoyuan hornblende gabbro are dated at 436 ± 5 Ma and 409±2 Ma, respectively. The Fengdingshan granites display characteristics of calc-alkaline I-type granite with high initial ~(87)Sr/~(86)Sr ratios of 0.7093-0.7127, low εNd(t) values ranging from -5.6 to -5.4 and corresponding Nd model ages (T_(2DM)) of 1.6 Ga. Their zircon grains have εHf[t] values ranging from -2.7 to 2.6 and model ages of 951-1164 Ma. The Taoyuan mafic rocks exhibit typical arc-like geochemistry, with enrichment in Rb, Th, U and Pb and depletion in Nb, Ta. They have initial ~(87)Sr/~(86)Sr ratios of 0.7053-0.7058, εNd(f) values of 0.2-1.6 and corresponding T_(2DM) of 1-0-1.1 Ga. Their zircon grains have eHf(r) values ranging from 3.2 to 6.1 and model ages of 774-911 Ma. Diorite and granodiorite from the Taoyuan Complex have initial ~(87)Sr/~(86)Sr ratios of 0.7065-0.7117, εNd(t) values from -5.7 to -1.9 and Nd model ages of 1.3-1.6 Ga. The petrographic and geochemical characteristics indicate that the Fengdingshan granites probably formed by reworking of Neoproterozoic basalts with very little of juvenile mantle-derived magma. The Taoyuan Complex formed by magma mixing and mingling, in which the mafic member originated from a metasomatized lithospheric mantle. Both the Fengdingshan and Taoyuan Plutons formed in a post-orogenic collapse stage in an intracontinental tectonic regime. Besides the Paleozoic Fengdingshan granites and Taoyuan hornblende gabbro, other Neoproterozoic and Indosinian igneous rocks located along the southeastern and western margin of the Yangtze Block also exhibit decoupled Nd-Hf isotopic systemics, which may be a fingerprint of a previous late Mesoproterozoic to early Neoproterozoic oceanic subduction.
机译：这项工作提出了对锆石U-Pb年龄和Hf同位素的综合研究，以及位于扬子地块东南边缘的志留系丰顶山I型花岗岩和桃园镁铁质-长相侵入岩体上的全岩石地球化学，华南克拉通东部古生界Ⅰ型花岗岩和镁铁质中间火成岩的认识。凤顶山花岗岩和桃园角闪闪发光辉长岩的年代分别为436±5 Ma和409±2 Ma。凤顶山花岗岩具有钙碱性I型花岗岩的特征，其初始〜（87）Sr /〜（86）Sr比率高，为0.7093-0.7127，εNd（t）值介于-5.6至-5.4之间，并且具有相应的Nd模型（T_（2DM））的年龄为1.6 Ga。其锆石晶粒的εHf[t]值范围为-2.7至2.6，模型年龄为951-1164 Ma。桃园镁铁质岩表现出典型的弧状地球化学特征，Rb，Th，U，Pb富集，Nb，Ta贫化。它们的初始〜（87）Sr /〜（86）Sr之比为0.7053-0.7058，εNd（f）值为0.2-1.6，相应的T_（2DM）为1-0-1.1 Ga。它们的锆石晶粒具有eHf（r ）值，范围从3.2到6.1，模型年龄为774-911 Ma。桃园矿山中的闪长岩和花岗闪长岩的初始〜（87）Sr /〜（86）Sr比为0.7065-0.7117，εNd（t）值为-5.7至-1.9，Nd模型年龄为1.3-1.6 Ga。地球化学特征表明，凤顶山花岗岩很可能是由新元古代玄武岩再造而成的，其中少有来自地幔的岩浆。由岩浆混合和混合形成的桃园复合体，其中的镁铁质成员起源于交代的岩石圈地幔。凤顶山和桃源岩体均在陆内构造条件下的造山后塌陷阶段形成。除了古生物丰顶山花岗岩和桃园角闪石长辉岩外，扬子地块东南缘和西缘的其他新元古代和印支期火成岩也表现出Nd-Hf同位素解耦，这可能是中元古界晚期至新元古代前期的指纹俯冲。

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  • 来源
    《Journal of Asian earth sciences》 |2013年第25期|11-24|共14页
  • 作者

    Yufang Zhong; Changqian Ma; Chao Zhang; Shiming Wang; Zhenbing She; Lei Liu; Haijin Xu;

  • 作者单位

    State Key Laboratory of Geological Processes and Mineral Resources. China University of Geosciences, Wuhan 430074, Hubei Province, China,Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, Hubei Province, China;

    State Key Laboratory of Geological Processes and Mineral Resources. China University of Geosciences, Wuhan 430074, Hubei Province, China,Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, Hubei Province, China;

    State Key Laboratory of Geological Processes and Mineral Resources. China University of Geosciences, Wuhan 430074, Hubei Province, China,Institut fuer Mineralogie, Leibniz Universitaet Hannover, Callinstr. 3, 30167 Hannover, Germany;

    Faculty of Geoscience and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan Province, China;

    State Key Laboratory of Geological Processes and Mineral Resources. China University of Geosciences, Wuhan 430074, Hubei Province, China,Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, Hubei Province, China;

    The First Institute of Geological and Environmental Survey, Henan Bureau of Geology and Mineral Resouces, Zhengzhou 450045, Henan Province, China;

    Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, Hubei Province, China;

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  • 正文语种 eng
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  • 关键词

    South China Craton; Paleozoic; Ⅰ-type granite; Malic rock; Nd-Hf decoupling;

    机译：华南克拉通;古生代Ⅰ型花岗岩;苹果酸岩Nd-Hf去耦;

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