摘要
本文通过流体包裹体的类型、时空分布、成矿温度、化学成分及成矿物理化学条件等研究认为:①石英包裹体中含有大量石盐和金属硫化物子晶,表现成矿流体具沸腾矿液特征;②角砾岩体内由上向下温度变化不大,但盐度增加,包裹体内子晶矿物类型依次为石盐→石盐+黄铁矿+正长石→石盐+辉钼矿+黄铁矿,与矿化蚀变分带基本一致;③成矿温度高于一般热液金矿床;④Au 以[AuCl]^-和[AuS]^-形式迁移,并在降温减压、稀释作用和溶液由弱酸向弱碱转化的还原条件下沉淀成矿。
Through the studies of type,distribution both in time and sp- ace,ore-forming temperature,chemical composition and ore-forming physiochemical conditions of fluid enclosures from Q explosive breccia type gold depos'ts,it can be concluded that: 1)Silican enclosures contarn a large number of salt and metallic sulfide crystallites.showing that the ore-forming fluid has a feature of boiling ore—forming fluid. 2)Vertically.the temperature within the breccia did not obv- iously very.but the salinity increased downwards.The mineral typ- es of crystallites are salt→salt+pyrite+orthoclase→salt+moly- bdenite+pyrite in their given order.Showing a consistency with the change of the mineralized and altered zones. 3)The ore—forming temperature is higher than that of com- mon hydrothermal gold deposits. 4)Gold elemrnt migrated in the form of [AuCl]]-and [AuS]- and deposited and formed the gold ore deposits under a reducing condition accompanied by a course of decrease of temperature and pressure,dilution and transform from weak acid into weak alkali.
