THE FORMATIVE MECHANISM AND METALLOGENIC MODEL OF THE GOSSAN TYPE GOLD-SILVER DEPOSITS IN THE LOWER REACHES OF THE YANGTZE RIVER AREA
Liu chenggang Dai Ruirong (Hefei University of Technology, Anhui 9.30009,China)
The lower reaches of the Yangtze River are an important Diwa mineralization area in eastern China. The gold—silver deposits of oxidized zones were derived from multimetanic sulphide deposits through supergenesis. Thus a secondary enriched orebody was formed with a distinct zoning of gold—silver from its top to the bottom. The absorption was very important at enrichment mineralization of gold and silver. This paper, on the basis of study of oreforming environment, composition of ores and structure, teture of ores etc, researches into kthe evolution process and formation mechanism of deposits with the metallogenic model constructed. The research makes sure that each oxidized zone in its evolution may be different in oxidization depending on its geological environment. All the deposits belong to weathering infiltration type gold—silver ones in Diwa area.