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矿床地质  2006 

云南哀牢山金矿带墨江金镍矿床铂族元素(PGE)地球化学及其对矿床成因的制约

Keywords: 地球化学,铂族元素,金镍矿床,超基性岩,蛇绿混杂岩,墨江

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Abstract:

文章系统地测定了墨江金镍矿床中的金镍矿和镍矿矿石中的PGE含量,结果均较低,∑PGE为(2.58~109.66)×10-9,与超基性岩的∑PGE〔(14.58~50.48)×10-9〕相差不大,且矿石与超基性围岩PGE+Au的球粒陨石标准化模式基本一致,均为Pt和Ir相对亏损和Ru及Rh相对富集的M型,显示墨江金镍矿PGE来源较为一致,主要来自超基性岩体;墨江金镍矿Pd/Ir比值为0.18~10.0,远低于典型热液型镍矿的Pd/Ir值(>100),而与岩浆型镍矿相近,说明其中的镍主要为岩浆成因,后期热液改造并不是Ni成矿的主导因素,因此墨江应为早期岩浆型Ni矿和晚期热液型Au(Ni)矿叠加形成的复合矿床。墨江金镍矿的超基性围岩直接来自地幔,是由经历了基性岩浆抽提和交代作用形成的亏损地幔发生程度不同的部分熔融形成的,其原始岩浆中硫已达到饱和。

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