低温浅成热液金矿若干问题讨论

本文根据29th IGC所交流的金矿地质内容，讨论了关于低温浅成热液金矿的若干问题，包括本类矿床的研究范畴、成矿时代、类型划分、形成的构造环境和主要的标志。本类金矿床是指火山岩地区地热系统所形成的金矿床。其形成时代主要是中新生代，并可早推至晚古生代；除形成于岛弧和其后的张裂构造环境之外，还见于陆核和中间地块的中生代上叠火山盆地；按照成矿地球化学条件及矿物共生组合可以分出冰长石-绢云母型和酸性硫酸盐型两类，按着成矿方式可以分出热液充填型、热液交代型和热液沉积型；主要标志表现在地热系统、赋矿围岩系统、成矿动力系统和矿床组合、矿物组成及热液蚀变系统等。

DISCUSSION ON SOME PROBLEMS ABOUT EPITHERMAL GOLD DEPOSITS

According to the gold geology exchanged in29th IGC, this paper discusses some prob-lems about epithermal gold deposits,including their studing range,age,classification,tectonic surronding and main indicators. This kind of gold deposits are those formed by geothermal system in volcanic rock ar-eas, their age is mainly Mesozoic-Cenozoic and earlier to be late paleozoic. They are formed in the island arc and later tensional tectonic surronding, in addition, may be found in the Mesozoic volcanic basins superposing on continental nucleus and median mass. Those gold deposits may be classified into two types, namely adularia -sericite type and acid sulfate type based on ore -forming geochemical condition and mineral association and into hydrothermal filling type, hydrothermal metasomatic type and hydrothermal sedimentary type based on the form of mineralization. The main indicators are shown bygeothermal system, host wallrock system, ore - forming dynamic system, deposit association, mineral composition and hy-drothermal alteration system etc.