安徽铜陵地区含金硫化物矿床成矿作用

METALLOGENESIS OF GOLD-BEARING SULFIDE DEPOSITS IN TONGLING AREA,ANHUI PROVINCE,CHINA

铜陵地区位于华中地洼区,苏鄂地洼系。具工业价值的金矿床多赋存于地洼期次一级构造以及它们的交汇处,这是本区构造控矿的特点。近矿围岩以地台型碳酸盐岩为主,矿体明显受地层层位控制。与矿化有关的侵入岩,主要形成于地洼期(燕山早、中期)。岩体形成后叠加了成矿热液的多次活动。金的成矿作用及金矿床的形成,通常与含金丰度相对较高的地台构造层有密切的成因联系,它们提供了重要的物质来源,可认为是矿源层(Source beds)。本区各主要矿床是以地洼型岩浆期后热液作用为主的多因复成层控含金硫化物矿床。

Tongling area, Anhui, China, is located at the Jiangsu-Hubei diwa series, Central China Diwa Region. Gold deposits in the area occurred in sub-structures formed in diwa stage and in intersection of them. Country rock near to ore body are mainly platform-type carbonate and the ore bodies are controlled clearly by strara. Intrusive bodies pertain to mineralization formed predominantly in diwa stage(Early and Middle Yanshanian), and consquently,are superimposod by thermal fluid activities. Gold metallogenesis and the formation of gold deposits usually have close relationship with the platform strata with relatively high gold abundance. These strata are considered ore-forming material source beds. The deposits in the area dominanted by the polygenetic compound stratabound deposits formed predominantly by diwa-type post-magmatic hydrothermal processes.