东北寨金矿床成矿机制：地球化学热力学研究

本文依据地球化学热力学方法圈定了东北寨微细浸染型金矿床的成矿条件，探讨了热液中金的溶解迁移形式及成矿过程。研究结果表明，Au（HS）-2和AuH3SiO04为金的主要迁移形式，随着主期硅化的发生，金的有效载体从AuH3SiO04转为Au（HS）-2；而AuCl-2的作用始终微不足道。石英及黄铁矿、辉锑矿等硫化物的沉淀是导致金成矿的主要因素。有机质对金成矿的贡献具有阶段性的意义。

MINERALIZATION MECHANISM OF DONGBEIZHAI GOLD DEPOSIT:GEOCHEMICAL THERMODYNAMIC STUDIES

The mineralizing conditions of the Dongbeizhai fine disseminated gold deposit are described,the dissolved or transported form of gold in hydrothermal fluid and the mineralizing process are studied by means of geochemical thermodynamics. It is shown that, Au (HS )2 and AuH3SiO4 and AuH,SiO4 are the main forms of gold transport. with the development of main-stage silicification, the effective gold carrier was transferred from AuH3SiO4 to Au (HS)2 However,the contribution of AuCl2 is negligible. The precipitation of quartz sulfides such as pyrite and stibnite is the main factor leading to the formation of the gold deposit. The role of organic matter in mineralization is limited.