摘要
江西省德兴地区双桥山群含金建造由上、下两个亚群组成。其中,下亚群是在被动大陆边缘基础上形成的早期伸张体系的碎屑沉积建造,上亚群为活动大陆边缘的火山沉积建造。金在建造中的分布变化较大,尤其是上亚群,平均含金25.5ppb,具有初步富集的特点。金的赋存状态以独立矿物为主,少量为与硫化物有关的微粒分散状态及吸附态,活性较大。含金建造不仅为该区各类型金矿床的形成提供了成矿物质、成矿流体及有利的赋矿围岩,还为其它年轻时代的衍生含金建造奠定了物质基础。
The gold-bearing formation of Shuangqiaoshan Group in Dexingdistrict, Jiangxi province, consists of two subgroups: the lower subgroup is a clastic sedimentary formation formed in the early tensile environ-ment based on a passive continental margin and the upper subgroup is avolcano-sedimentary formation in an active margin. The gold contentsobviously varied in the formation, particularly in the upper subgroupof which gold shows preliminary concentration with an average contentof 25.5 ppb. The gold individual minerals would contribute predomi-nant gold contents of the upper subgroup and the rest is mostly fromthe gold-bearing sulfides in which gold occurs as the scattered micropar-ticles and absorbed state and is readily accessible for migrating hydro-thermal solutions. Present paper consideres that the gold-bearing forma-tion would not only supply ore-forming materials and fluids and favo-rable host rocks for the various gold deposits, but also lay a mate-rial foundation for the formation of younger derivative gold-bearingformations.
基金
国家自然科学基金(地学86-158号)
关键词
元古界
层控矿床
地球化学
江西
火山沉积
含金建造
成矿流体
金矿床
gold
Proterozoic Erathem
stratabound deposit
geochemistry
Jiangxi
Dexing / Shuangqiaoshan Group
gold bearing formation
