河南桐柏老湾金矿床成矿物理化学条件研究  

STUDY ON THE PHYSICOCHEMICAL CONDITIONS OF THE LAOWAN GOLD DEPOSIT IN TONGBAI,HENAN

作　　者：黄震[1] 谢巧勤[1] 徐晓春[1] 潘成荣[1] 陆三明[1] 岳书仓[1] 

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009

出　　处：《安徽地质》2004年第1期26-29,共4页Geology of Anhui

摘　　要：老湾金矿床金的成矿作用主要发生在中-低温(T=150～3000℃、中-低盐度(Ws=2.37%～9.23%)、浅成(P=23～45MPa)、弱酸性、弱碱性(pH=6.1～7.7)和还原环境下(Eh=-0.72～-0.64)。金在成矿流体中主要以硫氢络合物形式迁移,流体的物理化学条件的改变导致流体中含金络合物溶解度的减小,从而导致金沉淀成矿。The Laowan gold deposit occurs in the metamorphic basic volcanic-sedimentary rocks of middle Proterzoic Guishan Formation.The ore-forming fluid has properties of middle-low temperature(150℃～300℃) and salinity(2.37%～9.23%),incompetent acid-neutral and reduction environment(lgfo_2=-42.36～-33.22, Eh=-0.72～-0.64).During mineralization processes,major gold complexes species were Au(HS)_2^-,AuHS. Principal physico-chemical conditions of gold deposition in the fluid were declining of temperature,oxygen fugacity,sulfur fugacity and etc.

关 键 词：金矿床 成矿作用 戍矿流体 物理化学条件 况淀 

分 类 号：P618.51[天文地球—矿床学] P611[天文地球—地质学]