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- W3130566348 abstract "Mesothermal gold vein minerals of the Seolhwa mine were deposited in a single stage of massive quartz veins which filled the mainly Nlrtrending fault shear zones exclusively in the granitoid of the Gyeonggi Massif. The Seolhwa mesothermal gold mineralization is spatially associated with the Jurassic granitoid of 161 Ma. The vein quartz contains three main types of tiuid inclusions at 25℃: 1) low-salinity ($lt;5 wt.% NaCl), liquid CO₂-bearing, type N inclusion; 2) gas-rich ($gt;70 vol.%), aqueous type II inclusions; 3) aqueous type I inclusions (0 -15 wt.% NaCl) containing small amounts of CO₂. The H₂O-CO₂-CH₄-N₂-NaCl inclusions represent immiscible fluids trapped earlier along the solvus curve at temperatures from 430℃ to 250℃ and pressures of 1 kbars. Detailed fluid inclusion chronologies may suggest a progressive decrease in pressure during the auriferous mineralization. The aqueous inclusion fluids represent either later fluids evolved through extensive fluid unmixing (CO₂-CH₄ effervescence) from a homogeneous H₂O-CO₂-CH₄-N₂-NaCl fluid due to decreases in temperature and pressure, or the influence of deep circulated meteoric waters possibly related to uplift and unloading of the mineralizing suites. The initial fluids were homogeneous containing Hz0-COz-CH4-Nz-NaCI components and the following properties: the initital temperature of $gt; 250 to 430℃, Xcoz of 0.16 to 0.62, 5 to 14 mole% CH₄, 0.06 to 0.3 mole% Nz and salinities of 0.4 to 4.9 wt.% NaCl. The T X data for the Seolhwa gold mine may suggest that the Seolhwa auriferous hydrothermal system has been probably originated from the adjacent granitic melt which facilitated the CH₄ formation and resulted in a reduced fluid state evidenced by the predominance of pyrrhotite. The dominance of negative δ^(34)S values of sulfides (-0.6 to 1.4‰) are consistent with their deep igneous source." @default.
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- W3130566348 date "2001-01-01" @default.
- W3130566348 modified "2023-09-23" @default.
- W3130566348 title "설화 광산의 중엽수 금광화작용 ; 유체포유물 및 황동위원소 연구" @default.
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