坦桑尼亚尼亚斯罗利金矿构造与成矿关系研究

摘要

The Nyasirori Gold Deposit of Tanzania is a middle endogenetic deposit,the ore bodies are strictly controlled by the shear zone,show parallelly and isometric in NE-SW and NW-SE's direction.For the kinds of altered minerals,mineral assemblage and interpenetration,the Nyasirori Gold Deposit is of a multi-period's hydrothermal activities.On the base of structure and mineralization study,the authors establish a correspondence relationship between the times of structure and mineralization periods.%坦桑尼亚尼亚斯罗利金矿为一中型金矿山,其金矿体严格受剪切构造带控制,为呈NE-SW向和NW-SE向展布且平行近等距分布的脉体群.根据矿石中热液蚀变的矿物种类、产状、矿物共生组合及相互穿插关系,认为尼亚斯罗利矿床的形成是多期次、多阶段热液活动的产物.通过研究区内构造和岩浆成矿作用,将本区构造-成矿期次划分为沉积富集期、构造-热液期、构造改造期和表生氧化期,并建立了构造期次和成矿期次之间的对应关系.