上東 텅그스텐 스카른 鑛床의 流體包有物 硏究

Fluid inclusion study of the Sangdong tungsten skarn deposits

Fluid inclusion study reveals that the mineralogical zonal distribution of the Sangdong skarn orebody may be likely related to (homogenization) temperatures of fluids with time and spaces. Firstly limestone beds were replaced by hot boiling fluids ranging from 350 to 550℃ and formed the pyroxene-garnet skarn, which was replaced into the amphibole and the quartz-mica skarns by non-boiling fluids at 300 to 500℃, mainly penetrated the central part of the pyroxene-garnet skarn orebody. Freezing tests identify presence of CaCl₂ and MgCl₂ as brines in the fluids besides NaCl and KCL that are shown as daughter minerals and show that two or more fluids be involved in mineralization by showing a bimodal distribution of salinities. This study has contributed to find a new orebody and a granitic pluton as a source rock.