Geochemistry of siliceous rocks and germanium mineralization of Lincang superlarge germanium deposit in Yunnan Province

<正> GERMANIUM, as a dispersed element, is highly dispersed in the crust and any independent deposit of ithas never been reported. It has long been obtained as a byproduct from some sulfide-rich deposits andcoal beds. The Lincang germanium deposit discovered in recent years in China can be considered as an independent germanium deposit of superlarge reserves. At present, about 800 t of germanium reserves havebeen exploited, the most part of which is concentrated in the first cycle of coal at the bottom of the basindeveloped on a granite basement, while the upper three coal cycles are basically barren. Bodies of Gemineralization exhibit a zonal pattern trending NNW, in consistence with the distribution of the siliceousrocks in the first coal cycle. Here we describe the geochemical characteristics of the siliceous rocks intercalated with the first coal