文档介绍：摘要
夏家店金-钒矿床为产于黑色岩系中的典型矿床。金矿完全受层位、有利岩性及构造的控制。金矿体呈扁豆状、透镜状、似板状等。氧化矿中金呈独立矿物存在,主要以粒间金和裂隙金为主。围岩蚀变不发育,近矿围岩主要有硅化、黄铁矿化等。根据金矿成矿作用方式分为沉积预富集期、构造一热液改造期和表生氧化富集期三个矿化期。金矿化石英脉流体包裹体H、O同位素组成特征暗示成矿流体来源于受到强烈改造的大气降水。铂族元素、硅同位素特征表明成矿物质具有多种来源,主要来自地层。根据金矿成矿特征、确定金矿床为沉积一改造型热液矿床。
钒矿体矿体形态简单,呈层状,严格受黑色岩系层位控制,矿体沿走向、倾向品位、厚度较为稳定。钒矿石大致可划分为①泥质硅板岩型、②碳质粘土岩型和③硅质碳质粘土岩型三种类型,均为层状构造,类型③钒矿品位一般较高。通过X衍射等方法确定钒以钒云母、铁的氧化物、钛铁矿等形式存在。根据钒矿地质特征和成矿作用方式确定其为沉积成因。
黑色岩系金-钒矿成矿规律:黑色岩系产于孤岛状古隆起边缘断陷沉积盆地内,沉积的陆源与内源物质充足。黑色岩系富集Au, V等多种成矿元素,既是矿源层、也是容矿层。碳质硅质板岩与碳质粘土板岩交互层+含磷结核层过渡型岩段反映海侵和海退动荡的沉积环境,有利于钒富集成矿以及金预富集和后期改造成矿。An、V成矿作用方式不同。
关键词:黑色岩系;金-钒矿;成矿特征;成矿规律
Abstract
Xiajiadian gold-vanadium deposit is a typical deposit hosed in the black rock series and controlled by the strata, favorable lithology and structure. The gold orebody is lenticular, platy-like. Gold occurs as independent mineral mainly in the inter grain of quartz and fracture. Wall-rock alteration is weak and the main alteration types in gold deposits are silicification and pyritization. The water es from strongly reconstructed meteoric water, according to the hydrogen and oxygen position of inclusion of the mineralized the basis of analysis PGE and Si isotopes, it is shown that the deposits e from many sources, but stratum is the main source. ic characteristics indicate the ore deposit is alterative hydrothermal deposit.
The vanadium orebodies, which have been controlled by the strata of black rock series, are simpiy layered.
Ore grade and thickness are stable along strike and tread. There are 3 types of vanadium ore:①the argillaceous silicic slate-type, ②the carbonaceous clay rock-type and③the carbonaceous silicic clay rock-type,usually the vanadium-rich one, all of the three types present mainly a structure of layered. Vanadium occurred as roscoelite, iron oxide and sefstromite etc. Sedimentary genesis is determined by the features and mineralization ways of the Vanadium deposit.
ic regularities of gold-vanadium mineralization host in black rock seri