云南个旧卡房矽卡岩型铜(锡)矿Re-Os年龄及其地质意义
Re-Os dating of molybdenite from the Kafang skarn copper (tin) deposit in the Gejiu tin polymetallic ore district and its geological significance
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摘要: 云南个旧超大型锡多金属矿田是一个驰名中外的超大型锡多金属矿田,卡房是该矿田的一个重要的铜(锡)矿床.本文利用Re-Os同住素定年方法对卡房矽卡岩型矿体中5件辉钼矿样品进行了成矿时代测定,获得辉钼矿Re-Os同位素模式年龄为82.95±1.16Ma～83.54±1.31Ma,等时线年龄为83.4±2.1 Ma.该年龄和老卡岩体的LA-ICP-MS锆石U-Pb年龄85±0.85Ma相吻合,表明成岩和成矿关系密切.辉钼矿Re含量显示成矿过程有地壳和地幔的共同参与.该Re-Os定年结果显示个旧卡房矽卡岩型铜(锡)矿床与云南都龙锡锌矿床、云南白牛厂银多金属矿床、广西大厂锡多金属矿床以及广西王社铜钨矿床的成矿年龄接近,表明这些矿床的形成受控于相同的地球动力学背景,同为华南中生代晚期大规模成矿作用的产物.
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关键词:
- 个旧 /
- 卡房矽卡岩型铜(锡)矿 /
- Re-Os同位素
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