摘要
我国条带状铁建造金矿主要分布在华北地台和佳木斯地块,分硫化物相、碳酸盐相、碳酸盐-氧化物混合相、硅酸盐-氧化物混合相和氧化物相条带状铁建造金矿五种类型。成矿经历火山沉积作用和区域变质作用两个阶段,形成于裂谷盆地,火山活动环境,受条带状铁建造层位、薄层、贫铁、沉积相和褶皱、剪切变形构造控制。成矿物质源于深部,直接来自条带状铁建造。成矿时代最老40Ar/39Ar同位素年龄为(2 416±64) Ma^(2 317±63) Ma。
BIF-hosted gold deposits are mainly distributed in North China platform and Jiamusi block, and can be divided into five categories: sulphur faces BIF-hosted gold deposits, carbonate faces BIF-hosted gold deposits, carbonate-oxide faces BIF-hosted gold deposits, Silicate-oxide faces BIF-hosted gold deposits and Oxide faces BIF-hosted gold deposits. The ore-forming process is consist of two different stages including volcanic sedmentary process and regional metamorphic process, occurring in rift basin setting with evident volcanic activities. The formation of BIF-hosted gold deposits is controlled dominantly by a series of factors such as the location of BIF within specific rock series, thin and iron-poor BIF, sedimentary faces of BIF as well as fold, shear-deformed structures. The ore-forming substances are primarily derived from deep part of the earth and directly come from BIFs themselves. The oldest 40Ar/39Ar isotopic ages of some gold deposits vary between(2 416±64)Ma^(2 317±63)Ma.
出处
《前寒武纪研究进展》
2002年第2期80-85,共6页
Progress in Precambrian Research
基金
国家计委科研专项(95-01)
