中国微细浸染型金矿矿质迁移沉淀机制

MECHANISM FOR THE MIGRATION AND DEPOSITION OF OREFORMING MATERIALS IN THE MICRODISSEMINATED TYPE GOLD DEPOSITS IN CHINA

本文在分析矿源和成矿物化条件基础上，经理论计算和研究，提出中国微细浸染型金矿中金是呈Ａｕ（ＨＳ）－２形式存在并迁移的，矿质沉淀的主要机理为温度下降和因硫化物沉淀而引起的总硫（及还原硫）活度下降，其次为压力的下降和有机质的还原吸附作用。

reforming fluids of the microdisseminated type gold deposits in China is supposed to be multiple sources and charaterized by lower to intermediate temperature,weak acidic to weak alkalescent,relatively stonge reductive,higher in total sulfur activity,and lower in total chlorine activity.It can be revealed from the calculation of theoetical solubility of complexes in different oreforming stges that the gold in the oreforming fluids was existed and migrated in the form of Au(HS)-2.The main mechanisms for gold deposition are the decrease of temperature,and the decrease of total sulfur(as well as reductive sulfur)activity resulted from the deposition of slfides such as pyrite,arsenopyrite,realgar,stibnite and cinnabar.The second mechauisms are the decrease of pressure,and the reduction and adsorption of organic material.