毕诗健;李建威;赵新福;

• 1:中国地质大学研究生院
• 2:中国地质大学地质过程与矿产资源国家重点实验室
• 3:香港大学地球科学系 中国地质大学地质过程与矿产资源国家重点实验室
• 4:中国地质大学资源学院

摘要(Abstract)：

石英脉型金矿床是最重要的金矿床类型之一,对其成矿时代的精确测定却一直是一道难题。近年来同位素质谱技术的发展使得通过含金石英脉中热液锆石的U-Pb定年来精确限定石英脉型金矿床成矿时代成为可能。但含金石英脉中的锆石组成通常较复杂,除有热液锆石外,还可能出现从围岩中捕获的岩浆锆石和变质锆石。锆石成因和组成的这种复杂性,经常导致所获得的U-Pb年龄数据难以解释或缺乏明确的地质意义。因此石英脉型金矿床锆石U-Pb定年的关键是有效区分从成矿流体中直接生长的热液锆石和从围岩中捕获的岩浆锆石或变质锆石。通过锆石形貌、结构、微量元素组成(含稀土元素)、矿物或流体包裹体特征等的系统分析和综合研究,可以较好地区分含金石英脉中的不同成因锆石。在此基础上利用先进的SHRIMP或LA-ICP-MS锆石U-Pb分析技术对石英脉中的热液锆石进行微区原位定年,可以获得石英脉型金矿床可靠的成矿年龄。

关键词(KeyWords)： 热液锆石;石英脉型金矿床;U-Pb定年;成矿年代

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金创新群体基金(40521001);; 中国地质大学研究生学术探索和创新基金(CUGYJS0715);; 地学类研究生创新中心项目(C-0611)

作者(Author): 毕诗健;李建威;赵新福;

Email:

DOI:

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