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 g...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.展开更多
文摘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.
