摘要
刺猬沟金矿床是中国东部人陆边缘较典型的低温热液金矿床。本文通过同位素、包裹体、原生晕及蚀变作用地球化学研究,得出该矿床成矿年龄为176Ma。成矿流体系深源(岩浆源)和浅源(大气降水)混合作用结果,前者提供了成矿元素(Au、Ag等)和矿化剂元素(C、S、Cl等)及部分水;后者是水的主要来源,且同时提供了Ca、Fc等阳离子。成矿流体的沉淀温度为221～305℃,沉淀深度为263～1063m。成矿流体盐度较低(<1Wt％NaCl当量),且CO_2包体很少。矿石Au/Ag比值平均为1左右。
Ciwcigou gold deposit is a typical cpithcrmal gold deposit in eastern continental margin of China. A comprehensive studies on this deposit have been given in this paper including isotope ,fluid inclusion, primary halo and alteration researches. And following conclusions arc given. The age of mineralization is 176 Ma; orc fluid is the mixture of magmatic thermal and meteoric water, the former provided Au, Ag ,C ,S ,Cl ,etc. and part of water, the later is the main source of water, and also at the same time devoted cations of Ca2+, Fe2+, etc. to the ore fluid. The ore fluid had lower salinities (1 wt% NaCl cquiv. ),fewer CO2 inclusions and deposited at the temperatures of 221-305℃ and the depth of 263-1063m. The average Au/Ag ratio is about 1.
基金
国家自然科学基金(49070164)
关键词
低温热液矿床
金矿床
包裹体
cpithermal gold deposit,stable isotope , inclusion, primary halo ,Yan-bian district of Jilin
