摘要
七宝山铁帽型金矿是原生含金硫化物多金属矿床长期经历表生地质作用的产物。本文揭示了该类型金矿床氧化剖面具有典型的分带模式;由下而上分为:原生硫化物带、次生硫化物带、松散硫化物亚带及铁帽亚带。金主要富集在铁帽亚带及次生硫化物带。指出了矿床氧化剖面的分带与矿区潜水面的分布有空间上的依存关系。文中还从元素地球化学和电化学角度,探讨了各带形成的机制及金在氧化剖面演化过程中的地球化学行为。
The Qibaoshan gossan type gold deposit is the result of supergenesis of the gold-bearing primary sulfide polymetallic deposit over a long period of time. In this paper, the authors have revealed that there is a typical zoning model of oxidation profile which can be generalized into four zones or subzones, from bottom upwards, i. e. primary sulfide, supergene sulfide, loose sulfide and gossan. Gold is mainly enriched in gossan and supergene sulfide. The authors have also pointed out the relationship between zoning of oxidation profile and water table. According to element geochemistry and electrochemical mechanism, the authors have also analyzed the formation mechanism of every zone and geochemical beha- viour of gold in evolution processes of oxidation profile.
关键词
褐铁矿
铁帽
金矿床
氧化剖面
limonite
gozzan
gold deposit
supergene process
