Physicochemical Conditions of Differential Mineralization of Au and As in Gold Deposits, Southwest Guizhou Province, China

摘要

The conditions under which gold and arsenic are enriched separately during mineralization in gold deposits in southwestern Guizhou Province were described and the thermody-namic calculations gave: 200 - 150℃ at 400 x 10~(-6) - 300 x 10~(-6) Pa (corresponding to a depth between 1.6 km and 1.2 km) ; lg f_(o_2)- 40 to - 35 Pa; lg f_(s_2)- 20 to - 16 Pa ; pH 5.0 -4.2 and Eh -0.53 V.