贵州寻找铂族元素矿床的思考

贵州省具有形成铂族元素矿床的地质条件，也存在铂族元素矿化的地质与地球化学信息，可能存在的矿床类型包括热液型、煤岩型、黑色页岩型等多种，可能发现矿床的地区除了在西部峨眉山玄武岩分布区之外，峨眉山玄武岩分布区外围的卡林型金矿和Hg、As、Sb等浅成低温热液型矿床分布区也值得重视。在找矿过程中，要充分研究哪些异常是由玄武岩引起的，哪些可能是由矿引起的。在采样时，由于铂族元素分布的极端不均性，天然重砂和人工重砂的配合是必要的。

Preliminary Thoughts on Prospecting for Platinum-Group Element (PGE) Deposits in Guizhou

It is existed the geological conditions and geochemical information for prospecting platinum -group element deposits in Guizhou. The possible ore deposit types include hydrothermal type, coal rock type, black shale type, mafic- ultramafic rock type and others. The possible areas include the distribution area of Emeishan basalt in northwestern Guizhou, the distribution area of Kalin - type gold deposits in southwestern Guizhou, the distribution area of shallow - seated low - temperature Hg - As - Sb deposits in central Guizhou, the distribution area of Cambrian black shale in north Guizhou and the distribution area of Proterozoic mafic - ultramafic rocks in northeastern Guizhou. It is important to discriminate basalt - induced geochemical anomaly and ore - induced geochemical anomaly in northwestern Guizhou, where the Permian Ermei mantle plume exerted a key role for the formation of possible PGE deposits. It is also necessary to apply suitable methods for evaluation economic ores, including natural and manual concentrating methods of heavy minerals, because of the strong heterogeneity of PGE distribution in ores or ore - hosting rocks.