Gold Solubility in SiO_2-HCl-H_2O System at 200℃:a Preliminary Assessment of the Implications of Silicification with Regard toGold Mineralization  

作　　者：王声远 樊文玲 

出　　处：《Chinese Journal Of Geochemistry》1994年第1期13-23,共11页中国地球化学学报

摘　　要：The complexation between gold and silica was experimentally confirmed and calibrated at 200℃:Thermodynamic calculations show that AuH3SiO40 would be far more abundant than AnCl2 un-der physicochemical conditions of geological interest, suggesting that silica is much more importantthan chloride as ligands for gold transport. In systems containing both sulfur and silica, AuH3SiO40would be increasingly more important than Au (HS)2 as thc proportion of SiO2 in the system in -creases.The dissolution of gold in aqueous SiO2 soluhons can be described by the reachon:which indicates that SiO2 precipitahon is an effective mechanism governing gold deposihon, and thusexplains the close association of silicification and gold mineralization.The complexation between gold and silica was experimentally confirmed and calibrated at 200℃:Thermodynamic calculations show that AuH3SiO40 would be far more abundant than AnCl2 un-der physicochemical conditions of geological interest, suggesting that silica is much more importantthan chloride as ligands for gold transport. In systems containing both sulfur and silica, AuH3SiO40would be increasingly more important than Au (HS)2 as thc proportion of SiO2 in the system in -creases.The dissolution of gold in aqueous SiO2 soluhons can be described by the reachon:which indicates that SiO2 precipitahon is an effective mechanism governing gold deposihon, and thusexplains the close association of silicification and gold mineralization.

关 键 词：金 溶解度 二氧化硅-盐酸体系 矿化作用 络合硅化作用 

分 类 号：P618.51[天文地球—矿床学]