秦岭造山带秋树湾铜钼矿床辉钼矿Re-Os定年及其地质意义
Re-Os dating of the molybdenite from the Qiushuwan Cu-Mo deposit in the east Qinling and its geological significance.
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摘要: 秋树湾铜钼矿床是秦岭造山带东段最大的斑岩-夕卡岩型铜钼矿床,通过对矿石中6个辉钼矿样品的Re-Os同位素分析,得到了145.57±1.80~147.98±2.21Ma的模式年龄(平均为146.42±1.77Ma)及一个相关性很好的等时线年龄147±4Ma,表明秋树湾铜钼矿床形成于晚侏罗世,与其以北的华北克拉通南缘的主要斑岩型钼矿床及位于扬子克拉通北缘的长江中下游铁铜矿床的大规模成矿时间一致,是中国东部中生代第2期大规模成矿作用的产物.秋树湾铜钼矿床辉钼矿的含铼量平均达151.8×10-6,明显高于华北克拉通南缘钼矿带同期形成的钼矿床(16.13×10-6~28.09×10-6),认为主要是由于两者成矿元素Cu/Mo比值的不同造成的;结合矿石硫同位素特征,认为矿床的物质主要来源于下地壳.
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关键词:
- Re—Os同位素测年 /
- Cu—Mo矿 /
- 秋树湾 /
- 秦岭造山带
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Key words:
- Os-Re isotopic dating /
- Cu-Mo deposit /
- Qiushuwan /
- Qinling orogeny
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