下扬子地区铁帽型金(银)矿床形成机制及成矿模式  

THE FORMATIVE MECHANISM AND METALLOGENIC MODEL OF THE GOSSAN TYPE GOLD-SILVER DEPOSITS IN THE LOWER REACHES OF THE YANGTZE RIVER AREA

作　　者：刘成刚[1] 戴瑞榕[1] 

机构地区：[1]合肥工业大学

出　　处：《安徽地质》1993年第2期43-51,74,共10页Geology of Anhui

基　　金：国家自然科学基金

摘　　要：本文在研究含金硫化物氧化带铁帽型金(银)矿床的成矿环境、矿石组分及组构基础上,进一步探讨了矿床的演化过程和形成机理,据此建立了成矿模式。研究表明,本区铁帽型金(银)矿床皆形成于地洼区,受氧化带发育程度及所处地质环境制约,属风化淋积成因金(银)矿床。成矿模式的建立,对在中下扬子地区寻找该类型矿床具有一定的理论和实践意义。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.

关 键 词：地洼区 氧化带 形成机理 吸附作用 成矿模式 

分 类 号：P5[天文地球—地质学]