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矿床地质  2002 

论胶西北河西金矿床成因及其动力学条件

Keywords: 金成矿作用,矿床成因,动力学条件,构造-岩浆活动,新城-焦家金矿田,河西金矿床

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Abstract:

胶东河西金矿床属于典型的蚀变岩型金矿床。金矿体赋存于玲珑黑云母花岗岩体内,并受北东向断裂构造带所控制。87Sr/86Sr的初始比值表明,玲珑黑云母花岗岩和郭家岭花岗闪长岩均为壳源深熔花岗岩。地质和同位素年代学资料表明,金成矿作用发生在早白垩世。据硫、氧同位素组成判断,河西金矿床的成矿作用可能与郭家岭花岗闪长岩的流体活动有关,其成矿温度以中温为主,成矿压力为(1?200~1?400)×105Pa。河西金矿床的花岗岩、蚀变岩和矿石的稀土与微量元素分布模式明显相似,说明它们有着共同的成因,与壳熔花岗岩岩浆作用有关。

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