一、地质概况在我国长江中下游地区有许多中生代陆相火山岩盆地。其中某些盆地内主要分布了碱玄岩-粗安岩-粗面岩岩石共生组合。盆地内矿化作用以铁为主,铜和黄铁矿等次之,伴有极其广泛的蚀变作用。粗安岩或辉石闪长玢岩(熔岩或潜火山岩)是该区主要的成矿背景岩石。近铁矿岩石多由铁镁硅酸盐矿物和碱性长石等蚀变矿物组成,俗称暗色蚀变岩石。有的矿床深部钠长石岩很发育,可另划出碱质蚀变带,统称暗色蚀变带。远矿为浅色蚀变 First, the geological overview In the middle and lower reaches of the Yangtze River in our country there are many Mesozoic continental volcanic basins. Some of these basins are mainly composed of the basalt-sorbite-palaeite rock symbiosis. The mineralization in the basin is dominated by iron, followed by copper and pyrite, with extremely extensive alteration. Rough rock or pyroxene diorite (lava or latent volcanic rock) is the main metallogenetic background rock in this area. Nearly iron rock and more by the iron magnesium silicate minerals and alkaline feldspar and other alteration minerals, commonly known as dark alteration rock. Some of the deep deposits of albite rocks are developed, and can be designated another alkaline alteration zone, collectively referred to as dark alteration zone. Mine is light color alteration