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矿床地质  2005 

甘肃黑石山埃达克岩金矿床成矿模式初析

Keywords: 地质学,埃达克岩,成矿模式,金矿床,板块俯冲,甘肃黑石山

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Abstract:

甘肃黑石山埃达克岩属O型埃达克岩,其岩石类型为奥长花岗岩。岩体位于黑石山穹隆南缘,西湾—苏家湾断裂北部上盘。在该埃达克岩体中发育有金矿床,矿床类型为含金石英脉型及蚀变花岗岩型。研究认为该矿床的形成主要经历了3个阶段:Ⅰ.次生洋板片俯冲并发生部分熔融形成埃达克质熔体;Ⅱ.熔体与地幔楔橄榄岩及幔源熔体的相互作用(金属的萃取)使熔体富集成矿元素;Ⅲ.熔体向上侵入成岩,后期构造运动及热液成矿作用使成矿元素活化迁移并最终富集成矿。

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