摘要
1 Geological features of fine disseminated gold deposits THE fine disseminated gold deposits occur mainly in the Indochina and Variscan fold belts along periphery of Yangtze plate, which constitute three concentrated regions including Sichuan-Gansu-Shaanxi, Yunnan-Guizhou-Guangxi and central Hunan regions. There are multiple mineralized strata from Sinian to Triassicof which Triassic and Devonian are chief ones. Ore-bearing rock series are mainly black carbon-bearingpelitic and sandy series. There are many kinds of host rocks for gold ores. Alterations such as silicification, carbonatization, argillation, chloritization and baritization occur in wallrocks. Ore bodies are closelyrelated to fractures, occurring in bedded ore veins. Major ore minerals are pyrite, arsenopyrite,
