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首页> 外文期刊>Journal of Asian earth sciences >Zircon U-Pb dating, trace element and Sr-Nd-Hf isotope geochemistry of Paleozoic granites in the Miao'ershan-Yuechengling batholith, South China: Implication for petrogenesis and tectonic-magmatic evolution
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Zircon U-Pb dating, trace element and Sr-Nd-Hf isotope geochemistry of Paleozoic granites in the Miao'ershan-Yuechengling batholith, South China: Implication for petrogenesis and tectonic-magmatic evolution

机译：南方苗尔山—岳城岭基岩古生代花岗岩锆石U-Pb定年，微量元素和Sr-Nd-Hf同位素地球化学：对成岩作用和构造岩浆演化的意义

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摘要

The Miao'ershan-Yuechengling batholith (MYB) is one of the largest granitic batholiths in South China. At least five individual phases have been identified for the Paleozoic granites in the MYB. SHRIMP and LA-ICP-MS zircon U-Pb dating results imply that these granites were emplaced at 435 ± 4 Ma, 427 ± 3 Ma. 417 ± 6 Ma, 404 ± 6 Ma and 382 ± 2 Ma, respectively. The ages gradually decreased from the southeast to the northwest, implying that the MYB was incrementally emplaced from the southeast to the northwest lasting from early Silurian to late Devonian. Most granites are metaluminous to weakly peralumi-nous, and contain low P_2O_5 contents (<0.15%). These granites show enrichment of Rb, Th, U and depletion of Ba, Sr, Eu, Ti. They show relatively high (~(87)Sr/~(86)Sr)_i ratios (>0.715), low ε_(Nd)(t) values (-8.9 to -6.7), and low zircon ε_(Nf)(t) values (-9.5 to -4.0). These geochemical and isotopic characteristics indicate that these granites may have formed from partial melting of Paleoproterozoic basement rocks. Slight geochemical differences between different phases can be interpreted as resulting from partial melting of heterogeneous sources or different proportion mixing of meta-igneous and meta-sedimentary rocks. Zircon Hf isotope model ages vary from 1.77 to 1.93 Ga, with an average value of 1.84 ± 0.07 Ga. These data indicate that crust growth in this region took place mainly during the Paleoproterozoic (ca. 1.84 Ga), and the basement in the MYB should belong to the Cathaysia Block. The formation of the Paleozoic granites in the MYB was suggested to be related to the late orogenic magmatism of the Wuyi-Yunkai orogeny. Thus, the late orogenic magmatism in the northwestern part of the Wuyi-Yunkai orogeny must have lasted until ca. 381 Ma and took place also to the east of the Anhua-Luocheng Fault.
机译：妙儿山-岳城岭岩基是我国南方最大的花岗岩基岩之一。 MYB中的古生代花岗岩至少确定了五个独立相。 SHRIMP和LA-ICP-MS锆石U-Pb测年结果​​表明这些花岗岩的位置为435±4 Ma，427±3 Ma。分别为417±6 Ma，404±6 Ma和382±2 Ma。年龄从东南到西北逐渐减少，这意味着MYB从东南到西北逐渐递增，从志留纪早期一直到泥盆纪晚期。大多数花岗岩是铝质至弱铝质的，并且P_2O_5含量低（<0.15％）。这些花岗岩显示出Rb，Th，U的富集以及Ba，Sr，Eu，Ti的耗竭。它们显示出较高的（〜（87）Sr /〜（86）Sr）_i比（> 0.715），较低的ε_（Nd）（t）值（-8.9至-6.7）和较低的锆石ε_（Nf）（t ）值（-9.5至-4.0）。这些地球化学和同位素特征表明，这些花岗岩可能是由于古元古代基底岩石的部分熔融而形成的。不同相之间的轻微地球化学差异可以解释为是由于非均质源的部分熔融或亚火成岩和亚沉积岩的不同比例混合所致。锆石Hf同位素模型年龄从1.77到1.93 Ga不等，平均值为1.84±0.07 Ga。这些数据表明该区域的地壳生长主要发生在古元古代（约1.84 Ga），而MYB的基底应该属于华夏街区。认为MYB中古生代花岗岩的形成与武夷—云开造山带的晚造山成岩作用有关。因此，武夷—云开造山带西北部的晚造山岩浆作用必须持续到大约２００３年。 381 Ma，也发生在安华—罗城断层以东。

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  • 来源
    《Journal of Asian earth sciences》 |2013年第25期|244-264|共21页
  • 作者

    Kui-Dong Zhao; Shao-Yong Jiang; Tao Sun; Wei-Feng Chen; Hong-Fei Ling; Pei-Rong Chen;

  • 作者单位

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

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

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

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

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

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

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Zircon U-Pb dating; Sr-Nd-Hf isotopes; Geochemistry; Paleozoic granites; Wuyi-Yunkai orogeny; South China;

    机译：锆石U-Pb约会;Sr-Nd-Hf同位素;地球化学;古生代花岗岩;武夷云开造山带华南;

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