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矿床地质  2011 

黑龙江三道湾子碲金矿床物质组成及成因意义

Keywords: 地质学,碲金矿床,碲化物,自然金,三道湾子,黑龙江

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Abstract:

三道湾子碲金矿床位于黑龙江省北部大兴安岭中段成矿带的东部,为一典型的碲化物型金矿床。笔者采用显微镜观察和电子探针分析技术,确认该矿床的矿石中存在碲金银矿、针碲金银矿、碲金矿、碲银矿和碲铅矿等碲化物。矿石中也存在大量自然金颗粒,产在石英、碲金银矿的裂隙中,或与碲化物共生产出。电子探针分析结果显示,该矿床内自然金的w(Au)=85.64%~93.41%,w(Ag)=6.17%~13.48%,为含银自然金,成色为864~938。碲在中、低温条件下易置换硫而使Te以类质同象的形式分散在硫化物的晶格中,但在高碲逸度(fTe2)的条件下,Te易与Au、Ag结合形成大量碲化物。

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