螢石鑛床의 地質溫度測定 硏究

Geothermometrical studies of fluorite deposits with special reference : to the studies of fluorites from the Wolaksan area and Cheonil mine, Chungcheongbuk-do

Temperature environments of the formation of fluorite deposits in the Wolaksan area and the Cheonil Mine, Chungcheongbuk-Do are presented and interpreted in brief. These deposits occur more or less near the contact zone between the Paleozoic limestone formations and the Cretaceous biotite granites as a number of hydrothermal veins or replacement deposits. The homogenization temperatures of fluorite crystals from the Wolaksan area fall within the narrow range of 149~167℃, of which lower limit is quite high, while those of the Cheonil Mine show wide range of 126~177℃, which indicates much lower mean temperature of formation. If the possible correction for pressure, which may not exceed+30℃ as the depth of the deposits was 1.5km, were applied, the possible highest value of the true formation temperatures of fluorites in both area might be reached to around 200℃ that means these deposits were formed as a series of early products of the epithermal stage of hydrothermal processes.