甘肃北山地区花牛山群变英安岩LA-ICP-MS锆石U-Pb年龄、地球化学特征及其地质意义

谢建强, 第鹏飞, 杨婧, 陈万峰, 魏海峰, 翟新伟. 甘肃北山地区花牛山群变英安岩LA-ICP-MS锆石U-Pb年龄、地球化学特征及其地质意义[J]. 西北地质, 2018, 51(1): 54-64.
引用本文: 谢建强, 第鹏飞, 杨婧, 陈万峰, 魏海峰, 翟新伟. 甘肃北山地区花牛山群变英安岩LA-ICP-MS锆石U-Pb年龄、地球化学特征及其地质意义[J]. 西北地质, 2018, 51(1): 54-64.
XIE Jianqiang, DI Pengfei, YANG Jing, CHEN Wanfeng, WEI Haifeng, ZHAI Xinwei. LA-ICP-MS Zircon U-Pb Age, Geochemistry and Tectonic Implications of Metamorphic Dacite from Huaniushan Group in Beishan Area, Gansu, China[J]. Northwestern Geology, 2018, 51(1): 54-64.
Citation: XIE Jianqiang, DI Pengfei, YANG Jing, CHEN Wanfeng, WEI Haifeng, ZHAI Xinwei. LA-ICP-MS Zircon U-Pb Age, Geochemistry and Tectonic Implications of Metamorphic Dacite from Huaniushan Group in Beishan Area, Gansu, China[J]. Northwestern Geology, 2018, 51(1): 54-64.

甘肃北山地区花牛山群变英安岩LA-ICP-MS锆石U-Pb年龄、地球化学特征及其地质意义

  • 基金项目: 中国地质调查局“甘肃北山营毛沱-玉石山地区铁铜金钨多金属矿整装勘查区关键基础地质研究”(12120114014501)、国家自然科学基金项目“峨眉山大火成岩省钒钛磁铁矿矿床成矿机制的流体组成制约”(41472070)和中央高校基本科研业务费专项资金“金川Ni-Cu硫化物矿床成矿过程的Mg同位素组成示踪”(lzujbky-2017-77)资助

LA-ICP-MS Zircon U-Pb Age, Geochemistry and Tectonic Implications of Metamorphic Dacite from Huaniushan Group in Beishan Area, Gansu, China

  • 采用锆石U-Pb方法在甘肃北山地区花牛山群中变英安岩中获得LA-ICP-MS U-Pb年龄为(454.7±0.87)Ma(MSWD=0.28),属晚奥陶世早期的产物,该年龄可为准确厘定花牛山群的沉积时代提供新的依据,从而将其修订为上奥陶统。同时岩石地球化学具高碱、高铝,富集Rb、Th、U、K、Pb,亏损Nb、Ta、Ti,无明显δEu异常,显示出明显的火山弧岩浆特征。结合区域地质资料表明,岩体形成于活动大陆边缘,其形成与俯冲流体交代或俯冲沉积物的加入有关,与花牛山铅锌矿的喷流(气)沉积型块状硫化物矿床形成环境不同,因此,认为花牛山群并非花牛山铅锌矿的赋矿层位。
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收稿日期:  2017-08-13
修回日期:  2017-11-25
刊出日期:  2018-03-15

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