| 贵州遵义黑色页岩铂族金属富集特点及富集模式 |
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| 引用本文：.2002.Enrichment Features and Patterns of PGE Metals in Black Shale from Zunyi area, Guizhou Province[J].Mineral Deposits,21(4):377~386 |
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| 基金项目:地质大调查资助项目“我国新类型矿床找矿前景评价”(DKD992005) |
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| 中文摘要: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。 |
| 中文关键词:地球化学 MoNi金属层 PGE富集模式 黑色页岩 遵义 |
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| Enrichment Features and Patterns of PGE Metals in Black Shale from Zunyi area, Guizhou Province |
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| Abstract:The enrichment features and patterns of PGE in black shale of Lower Cambrian Niutitang Group of Zunyi area, Guizhou Province were studied in the light of PGE distribution in strata and ores as well as ore mineral phases. Some characteristics have been recognized:(1)the PGE is concentrated only in the Mo_Ni metallic layer at the bottom of black shale, with its content higher than 0.5×10-6, but not in the ordinary sedimentary black shale and the thin banded pyrite layers of the ore bed; (2)there exist positive correlations between PGE and Mo, Ni, Fe, respectively, but no correlation is discerned between PGE and total C which represents organic and carbonic matters in the metallic layer; (3)the primitive mantle normalized PGE patterns indicate that the curve of Mo_Ni_PGE is “W”_shaped, suggesting the enrichment of Os and Rh of higher melting points and Pt and Pd of lower melting points, and that the curve of black and thin_layered pyrite ore somewhat assumes the shape of Pt and Pd enrichment. It can thus be concluded that the enriched sulfide ore bed must have resulted from the rapid superimposition of the submarine hydrothermal sedex upon the accumulative black shale at the early stage. |
| keywords:geochemistry, PGE enrichment features, PGE enrichment patterns, black shale, Mo_Ni_PGE metallic bed, Zunyi |
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