河北寿王坟铜矿黄铜矿铷锶同位素年龄测定及其成矿意义

Chalcopyrite Rb-Sr isochron age dating and its' ore-forming significance in Shouwangfen copper deposit,Hebei province.

本文以黄铜矿及其共生矿物为定年对象,采用亚样品取样和铷锶等时线定年方法测定了寿王坟铜矿的成矿时代。分析测试获得黄铜矿+黄铁矿单矿物组合的等时线年龄113.6Ma,黄铜矿+夕卡岩组合的等时线年龄112.3Ma 和黄铜矿+黄铁矿+夕卡岩组合的等时线年龄115.0Ma。对比同一矿石亚样品,认为河北寿王坟夕卡岩型铜矿成矿时代为111.0Ma。实验表明,采用矿石亚样品取样方法和直接测定金属硫化物单矿物铷-锶同位素年龄可以有效地确定矿床成矿时代。

In this paper, the sub-sample chalcopyrite Rb-Sr isochron age, 111.0Ma, had been successfully measured, which illustrated the skarn ore-forming age in Shouwangfen copper deposit. Contrasting with chalcopyrite ＋ pyrite assemblage age （113.6Ma） and chalcopyrite ＋ skarn age （112.3Ma） and chalcopyrite ＋ pyrite ＋ skarn age （115.0Ma） obtained by the same means, convinced us that directly dating the sub-sample metal minerals＇ age could be a routine metal deposit chronological method.