屯田金鑛山 南鑛床에서 産出되는 Sb, Bi 硫鹽鑛物의 産出狀態와 生成環境

Mode of occurrences and depositional conditions of Sb, Bi sulfosalt minerals from south ore deposits, Dunjeon gold mine

South ore deposits of the Dunjeon gold mine is a fissure-filling vein emplaced in the Cretaceous granodiorite, skarnized and/or hornfelsified Ordovician Dumudong Formation. Mineralization can be divided into three distinct depositional stages on the basis of vein structure and mineral assemblages. Sb, Bi sulfosalts minerals, such as tetrahedrite, bournonite, boulangerite, cosalite, lillianite, heyrovskyite, unknown Pb-Bi-Sb-S mineral, native Sb, native Bi and Au-Ag minerals are mainly deposited in stage Ⅱ. The formation temperature and sulfur fugacties of Sb, Bi minerals in the stage Ⅱ deduced from thermodynamic considerations are from 172° to 378℃ and from 10-10.6 to 10-19.4 atm. Those temperatures are good agreement with temperature data obtained by fluid inclusion study which has reported already.