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广西田林县八渡金矿床主要产于辉绿岩侵入体中,广泛发育乳白色石英网脉,蚀变辉绿岩体即为金矿体,具有硅化、粘土化、碳酸盐化和硫化物化等卡林型金矿热液蚀变特征。本文采用电子探针(EPMA)背散射电子图像(BSE)、波谱(WDS)和能谱(EDS)分析技术,对该矿床原生矿石中含金硫化物显微岩相学结构以及主量和微量元素含量和分布规律进行了系统研究,认为金主要是以不可见化学结合态金(Au+)的形式赋存于含砷黄铁矿和毒砂之中。含金硫化物与热液交代形成的金红石密切共生,并保留含钛铁辉石或钛铁矿等矿物的假象,金红石的形成是辉绿岩中含钛铁辉石或钛铁矿热液蚀变的产物,含金硫化物形成所需要的Fe来自辉绿岩中含钛辉石或钛铁矿等矿物的溶解,Fe的硫化物化过程是导致含金硫化物形成的重要机制。
The Baidu gold deposit in Tianlin County, Guangxi Province is mainly produced in the diabase intrusive body and the milky white quartz veins are widely developed. The altered diabase is a gold ore body with silicification, clayification, carbonation and sulfidation Carlin - type gold deposit hydrothermal alteration characteristics. In this paper, electron microscopy (EPMA) backscattered electron image (BSE), spectroscopy (WDS) and energy dispersive spectroscopy (EDS) Elemental content and distribution were studied systematically. It is believed that gold mainly occurs in arsenic-bearing pyrite and arsenopyrite in the form of invisible chemical combination of gold (Au +). The formation of rutile is accompanied by the illusion of the presence of ilmenite or ilmenite in the diabase. The formation of rutile is accompanied by the hydrothermal attack The resultant product, Fe required for formation of gold-bearing sulfides, is derived from the dissolution of minerals such as titaniferous or ilmenite from diabase. The sulfidation of Fe is an important mechanism leading to the formation of gold-bearing sulfides.