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矿床地质  2002 

阿拉善东七一山大型萤石矿床萤石钐-钕同位素年龄及地质意义

Keywords: 钐-钕同位素,等时线年龄,萤石,矿床成因,东七一山

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Abstract:

为了查明东七一山矿床的形成过程,对主矿体中的5件萤石样品进行了钐-钕同位素测定,所获得的等时线年龄为(511±5)Ma和MSWD值为0.10。此外,143Nd/144Nd初始比值为0.511760±5(2σ)和εNd(t)为-4.2±0.5(2σ)。依据上述同位素分析数据,同时结合容矿围岩和矿体的地质特征,可以推测,东七一山萤石矿床是加里东期构造-岩浆活动的产物。成矿热液来源与壳源岩浆结晶分异作用有关。该矿床属侵入岩为主岩的中高温热液萤石矿床。

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