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矿床地质  2002 

贵州遵义黑色页岩铂族金属富集特点及富集模式

Keywords: 地球化学,MoNi金属层,PGE富集模式,黑色页岩,遵义

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Abstract:

文章通过贵州遵义下寒武统牛蹄塘组黑色页岩剖面和矿石的PGE分析以及矿石物相分析,研究了PGE在黑色页岩中的富集特点和富集模式。发现:①PGE只在黑色页岩底部Mo_Ni金属层中富集;②金属层中PGE富集与Mo、Ni硫化物和黄铁矿呈正相关关系,与总碳(C总)代表的有机质和炭质无关,矿石PGE含量随硫化物总量呈增高的趋势;③Mo-Ni-PGE矿石PGE原始地幔标准化配分曲线呈“W”型,富集高熔点元素Os、Rh和低熔点元素Pt、Pd;黑色页岩和条带状黄铁矿夹层配分曲线略呈Pt、Pd富集型,两者有较明显的差别。因此,Mo-Ni-PGE金属硫化物富集层是黑色页岩沉积早期迅速叠加的一次海底热水喷流沉积作用的结果。

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