Geochemical Studies on Au-Ag Hydrothermal Vein Deposits, Republic of Korea : Goryeong-Waegwan Mineralized Area

高靈-倭館 지역 金-銀 鑛床은 白堊紀 新洞層群 內에 발달하는 열하을 充塡, 3회에 거쳐 生成된 石英 및 方解石脈으로 구성된다. 鑛化作用의 時期는 後期 白堊紀(98 Ma) 이며, 성인적으로 岩株狀 黑雲母 花崗岩의 買入 固結作用과 관련된 것으로 고려된다. 流體包有物 및 安定同位元素 硏究에 의하면, 金-銀의 침전은 1.7~8.7wt.% NaCl 相當 監農度를 갖는 鑛化流體로부터 280℃에서 230℃에 걸쳐 진행되었으며, 鑛化 作用時의 壓力은 <100bar, 深度는 425~1,150m였다.

Gold-silver mineralization of the Goryeong-Waegwan area was deposited in three stages of quartz and calcite veins which fill fissures in Cretaceous sedimentary rocks of the Sindong Group. Radiometric dating indicates that mineralization is Late Cretaceous age(98 Ma) likely associated genetically with intrusion of a small biotite granite stock. Fluid inclusion and stable isotope data indicate that Au-Ag ore was deposited at temperatures between 280℃ and 230℃ from fluids with salinities between 1.7 and 8.7 equiv.wt.% NaCl. Evidence of boiling indicates pressures of <100 bars, corresponding to depths of 425 and 1,150m, respectively, assuming lithostatic and hydrostatic loads.