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矿床地质  2005 

内蒙古额勒根斑岩型钼(铜)矿化区辉钼矿铼-锇同位素年龄及地质意义

Keywords: 地球化学,铼_锇同位素年龄,辉钼矿,斑岩型钼(铜)矿化体,额勒根,内蒙古

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Abstract:

为了查明额勒根矿化区斑岩型钼(铜)矿化发生的时间,对主要矿化体内5件辉钼矿样品进行了铼_锇同位素分析,所获同位素等时线年龄为(332.0±9.0)Ma(2σ),其MSWD值为0.29。鉴于辉钼矿呈浸染状分布于似斑状花岗闪长岩和花岗闪长斑岩体中,并且与黄铜矿和黄铁矿呈共生结构关系,推测额勒根地区斑岩型钼(铜)矿化体、似斑状花岗闪长岩和花岗闪长斑岩体的形成时间为早石炭世中期,均是海西中期构造_岩浆活动的产物。

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