贵州水银洞金矿床成矿物理化学条件及金的迁移和沉淀  

PHYSICAL-CHEMICAL CONDITIONS OF MINERALIZATION AND THE TRANSPORTION AND DEPOSITION OF AU IN SHUIYINDONG GOLD DEPOSIT,GUIZHOU PROVINCE

作　　者：肖德长[1] 李葆华[1] 顾雪祥[2] 徐仕海[1] 付绍洪[3] 陈翠华[1] 董树义[1] 

机构地区：[1]成都理工大学地球科学学院,成都610059 [2]中国地质大学地球科学与资源学院,北京100083 [3]中国科学院地球化学研究所,贵阳550002

出　　处：《物探化探计算技术》2012年第1期73-79,2,共7页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国家自然科学基金(40873036;40772060);国家自然科学重点基金(40930423)

摘　　要：对水银洞金矿床流体包裹体开展了研究和热力学计算,解析了该矿床成矿物理化学条件及金的迁移形式和沉淀机制。研究表明:金的主成矿温度为215℃～267℃,压力28.5MPa～37.2MPa;成矿流体具弱酸性(pH=4.312)、还原性(fO2﹤10-35.315×105 Pa)。金在成矿溶液中主要以AuHS0等络合物形式进行迁移,HS-活度和氧逸度降低以及pH值升高是促使金沉淀的主要机制。Based on the research of fluid inclusions and thermodynamics calculate in shuiyindong gold deposit,we have studied the physical-chemical conditions of mineralization,and the transportation form and deposition mechanism of the deposit.The research shows that the main temperature of gold mineralization is 215℃~267℃,and the pressure is 28.5MPa^37.2MPa;the ore-forming fluid with characteristics of weak acidity(pH=4.312),reducibility(fO2﹤10-35.315×105 Pa);AuHS0 is the main transportation form of Au in the ore-forming solution;the main deposition mechanisms of Au are the decrease in the activity of HS-and fO2 and an increase in pH values.

关 键 词：水银洞金矿床 流体包裹体 迁移和沉淀 成矿流体 

分 类 号：P595[天文地球—地球化学]