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大别山木子店地区细粒二长花岗岩脉的年龄和成因——锆石U-Pb年龄和Hf同位素制约

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刘劲松, 胡俊良, 刘阿睢, 金世超, 定立. 大别山木子店地区细粒二长花岗岩脉的年龄和成因——锆石U-Pb年龄和Hf同位素制约[J]. 地质通报, 2016, 35(12): 2088-2099.
引用本文: 刘劲松, 胡俊良, 刘阿睢, 金世超, 定立. 大别山木子店地区细粒二长花岗岩脉的年龄和成因——锆石U-Pb年龄和Hf同位素制约[J]. 地质通报, 2016, 35(12): 2088-2099.
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LIU Jinsong, HU Junliang, LIU Asui, JIN Shichao, DING Li. Age and origin of Muzidian fine-grained monzogranite dyke in Dabie orogenic belt: Zircon U-Pb dating and Hf isotopic constraints[J]. Geological Bulletin of China, 2016, 35(12): 2088-2099.
Citation: LIU Jinsong, HU Junliang, LIU Asui, JIN Shichao, DING Li. Age and origin of Muzidian fine-grained monzogranite dyke in Dabie orogenic belt: Zircon U-Pb dating and Hf isotopic constraints[J]. Geological Bulletin of China, 2016, 35(12): 2088-2099.
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大别山木子店地区细粒二长花岗岩脉的年龄和成因——锆石U-Pb年龄和Hf同位素制约

  • 1. 中国地质调查局武汉地质调查中心, 湖北武汉 430205;
    2. 中国地质调查局花岗岩成岩成矿地质研究中心, 湖北武汉 430205

Age and origin of Muzidian fine-grained monzogranite dyke in Dabie orogenic belt: Zircon U-Pb dating and Hf isotopic constraints

  • 1. Wuhan Center of Geological Survey, China Geological Survey, Wuhan 430205, Hubei, China;
    2. Research Center of Granitic Diagenesis and Mineralization, China Geological Survey, Wuhan 430205, Hubei, China

    摘要
  • 用LA-ICP-MS 技术对北大别木子店地区细粒二长花岗岩脉中的锆石进行原位U-Pb 年龄和Hf 同位素测定，结果表明，该花岗岩形成于128.9±0.7Ma，为早白垩世岩浆活动的产物，在锆石中发现古元古代和新元古代的锆石核；锆石εHf（t）介于-25.1~-19.2 之间，平均值为-22.7，二阶段模式年龄TDM2 主要介于2115~2505Ma 之间，2 个继承锆石分析点分别给出了-10.5 和6.5 的εHf（t）值，对应的二阶段模式年龄TDM2分别为1151Ma 和1709Ma。木子店地区细粒二长花岗岩脉的锆石年龄和Hf 同位素特征表明，花岗岩为古元古代古老地壳物质部分熔融形成，岩石源区可能有中元古代地幔物质及太古宙古老地壳物质的贡献，形成于大别造山带从挤压向伸展的转换阶段。
    This paper presents LA-ICP-MS zircon U-Pb dating and zircon in-situ Hf isotopic analytical results for the Muzidian fine-grained monzogranite dyke in northern Dabie orogenic belt. The dating results show that the granite was formed at 128.9±0.7Ma in Early Cretaceous. Two Paleoproterozoic and Neoproterozoic inherited zircons were found in the granites. The Hf isotopic analytical results show that the zircons εHf(t) values are from -25.1 to -19.2 with the mean of -22.7, and the two-stage Hf model ages (TDM2) generally range from 2115Ma to 2505Ma. The εHf(t) values of the two inherited zircons are -10.5 and 6.5, with the corresponding TDM2 of 1151Ma and 1709Ma, respectively. The zircon U-Pb dating and in-situ Hf isotopic results indicate that the parental magmas of Muzidian finegrained monzogranite dyke were derived from partial melting of Paleoproterozoic crustal rocks, with some Mesoproterozoic mantle and Archean crustal materials probably making contributions to the source. The Muzidian finegrained monzogranite dyke is considered to have been formed at the time of tectonic transition from compression to extension during Early Cretaceous in the Dabie orogen.
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收稿日期:  2015-12-01
修回日期:  2016-02-02
刊出日期:  2016-12-15

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