云南白马寨铜镍硫化物矿床Re-Os同位素定年及其地质意义
Re-Os isotopic dating and its geological implication of Baimazhai Cu-Ni sulphide deposit, Yunnan province, China.
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摘要: 采用Carius管溶矿、蒸馏法分离Os、丙酮萃取Re和电感耦合等离子体质谱(ICP-MS)联合测定法,对云南白马寨岩浆岩型铜镍硫化物矿硫化物矿石进行了Re-Os同位素精确定年,得出其等时线年龄为259±18Ma(MSWD=0.028),187Os/188Os初始值为0.455±0.024,相当于γ(Os(t)为+263.硫化物矿石Re/Os比值为11.56~21.04.研究结果显示,白马寨铜镍硫化物矿床成矿时代与峨眉大火山岩省主喷发期基本同时,其物质来源属壳-幔混合来源,壳源Os的加入量约为30%左右.
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关键词:
- 铜-镍硫化物 /
- Re—Os同位素定年 /
- ICP—MS /
- 地质意义 /
- 白马寨
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