Geology and vein tin mineralization in the Dadoushan deposit, Gejiu district, SW China

摘要

Vein-type tin mineralization in the Dadoushan deposit, Laochang ore field, Gejiu district, SW China, is predominantly hosted in Triassic carbonate rocks (Gejiu Formation) over cupolas of the unexposed Laochang equi-granular granite intrusion. The most common vein mineral is tourmaline, accompanied by skarn minerals (garnet, di-opside, epidote, phlogopite) and beryl. The main ore mineral is cassiterite, accompanied by minor chalcopyrite, pyrrho-tite, and pyrite, as well as scheelite.