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矿床地质  2002 

新疆黄山东铜镍硫化物矿床Re-Os同位素测定及其地球动力学意义

Keywords: 地球化学,Re-Os同位素测年,二叠纪,黄山东,铜镍硫化物矿床,新疆

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Abstract:

通过对黄山东铜镍硫化物矿石的Re-Os同位素测年,获得等时线年龄数据为(282±20)Ma。该数据表明产于东天山的这套铜镍硫化物矿床及其相关的镁铁质_超镁铁质岩并非泥盆纪_早石炭世洋底的蛇绿岩建造和相关成矿系统,它晚于岛弧演化阶段,出现于碰撞后的伸展环境,与区内广泛发育的造山型金矿和浅成低温热液型金矿为同一时期形成。其等时线187Os/188Os初始比值为0.24±0.04,γOs值平均为99,显示出在成矿过程及岩浆侵位期间有不少地壳物质混入成岩成矿系统。

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