矽卡岩矿床共生单科辉石—石榴石氧逸度计及主要金属矿化类型矽岩生成的氧逸度条件

基于我国主要类型矽卡岩矿床的研究，结合Ca-Fe-Si-C-O体系的实验成果，以共 生矿物固溶体热力学分析为手段，建立了共生单斜辉石一石榴石氧逸度计。对我国主要类型矽卡 岩的研究表明:不同金属矿化及不同产出条件的矽卡岩形成于不同的氧逸度环境，具有不同的氧 逸度变化趋势和温度一氧逸度效应。共生单斜辉石一石榴石矿物对是形成介质的良好氧逸度计、酸度计。它有助于判别矽卡岩的金属矿化类型。

The oxygen Fugacity Indicator of the Paragenetic Clinopy-roxene-Garnet Pair in Skarn Deposits and the Formation Conditions of Skarns Related to Major Metallization Types

A calculating method for oxygen fugacity of paragenetic clinopyroxene-garnet pair is established on the basis of data obtained from the major types of skarn ore deposits in combination with experimental results of Ca-Fe-Si-C-O system and by means of thermodynamic calculation for solid solution of the paragenetic minerals. A study of major types of skarns in China suggests that different metallizations and skarns occur in different environments of oxygen fugacity and show different variation trends of oxygen fugacity and diverse effects of temperature-oxygen fugacity. The paragenetic clinopyroxene-garnet pair is as effective indicator for the oxygen fugacity and acidity of ore--forming fluids and helps to discriminating between metallization types of skarns.