대화(大華) 및 돈산(敦山) 중석(重石)·모리브덴 광상(鑛床)의 유체포유물(流體包有物)

박희인,최석원,김덕래,Park, Hee-In,Choi, Suck-Won,Kim, Deog-Lae 대한자원환경지질학회 1985 자원환경지질 Vol.18 No.3

Mineralization of Daehwa and Donsan W-Mo deposits can be devided into three distinct depositional stages on the basis of mineral paragenesis and flnid inclusion studies; stage I, deposition of oxides and silicates ; stage II, deposition of base-metal sulfides and sulfosalts with carbonates; stage III, deposition of barren calcite and fluorite. Tungsten, molybdenum and tin mineralization occurred in stage I. Fluid inclusion studies reveal that ore fluid of stage I were homogeneous $H_2O-CO_2$ fluids containing 3.5~14.6 mol % $CO_2$. Minimum temperature and pressure of stage I ore fluids were $240^{\circ}C$ and 500 bars respectively. Salinities of aqueous type I inclusions in minerals of stage I range from 3.7 to 7.6 wt. % equi. NaCl. whereas those of $CO_2$-containing type III inclusions range from 0.3 to 4.4 wt. %. Temperatures of stage II ore fluids range from 200 to $305^{\circ}C$ on the whole and salinities were in the range of 3.2~7.2 wt. %. Homogenization temperatures of fluid inclusions in calcite and fluorite of stage III range from 114 to $186^{\circ}C$ and salinities were in the range of 0.9~4.3 wt. %. Sulfur fugacities during stage II deduced from mineral assemblages and tamperature data from fluid inclusions declined from earlier to later in the range of $10^{-11}{\sim}10^{-18}atm$. Fluid inclusion evidences suggest that the dominance of $CO_2$ in ore fluid during W-Mo mineralization is the characteristic features of Cretaceous W-Mo deposits of central district of Korea compared to those of Kyeongsang basin district.

대화(大華) 및 돈산(敦山) 중석(重石)·모리브덴 광상(鑛床)의 광석(鑛石)과 광물공생관계(鑛物共生關係)

박희인,최석원,김덕래,Park, Hee-In,Choi, Suck-Won,Kim, Deog-Lae 대한자원환경지질학회 1985 자원환경지질 Vol.18 No.1

The Daehwa and Donsan tungsten-molybdenum deposits are composed of numerous fissure-filling veins developed in Precambrian gneiss and Cretaceous granite and quartz porphyry. K-Ar age of biotite in granite and that of muscovite in ore veins are $105{\pm}5\;Ma$ and 88.2~88.6 Ma respectively. Occurrence of ore deposits shows that relevant igneous rock is possibly quartz porphyry rather than above mentioned granite in temporal view point. Vein structure and mineralogy suggest that ore veins were formed by continuous vein filling, not by repeated mineralization. Three distinct depositional stages with decreasing age can be devided on the basis of mineral paragenesis and fluid inclusion studies: Stage I, deposition of oxides and silicates; stage II, deposition of base-metal sulfides and sulfosalts with carbonates; stage III, deposition of barren calcite and fluorite. Tungsten, molybdenum and tin mineralization occurred in stage I.

덕흔·법전광산(法田鑛山)의 금(金)-은(銀)광화작용(鑛化作用)

박희인,황정,김덕래,Park, Hee-In,Hwang, Jeong,Kim, Deog-Lae 대한자원환경지질학회 1990 자원환경지질 Vol.23 No.1

Gold-silver deposits of Deogheun and Beopjeon mines are composed of veins emplaced in Jurassic granite batholith. Based on ore structure and ore mineralogy, four distinct stages of mineral deposition are recognized in these ore deposits. Gold and silver minerals in Deogheun and Beopjeon-A ore deposits are precipitated in stage III and stage II, respectively. Mineral constituents of ores from these deposits are pyrite, sphalerite, arsenopyrite, pyrrhotite, chalcopyrite, galena, tetrahedrite, electrum, quartz and rhodochrosite. Cubanite, argentite and pyrargyrite occur only in Deogheun ore deposits. Ag content of electrum range from 42 to 66 atomic % in both ore deposits. Filling temperature of fluid inclusion from both ore deposits are as follows; stage I, $211-289^{\circ}$ ; stage II, $205-290^{\circ}$ ; stage III, $190-260^{\circ}$ ; stage IV, $136-222^{\circ}$ in Deogheun ore deposits. In Beopjeon-A ore deposits, stage I, $255-305^{\circ}$ ; stage II, $135-222^{\circ}$ ; stage III, $148-256^{\circ}$ ; stage IV, $103-134^{\circ}$. Salinities of fluid inclusions range from 1.6-8.5 wt. % equivalent NaCl in both ore deposits. Sulfur fugacities through stage II and III in Deogheun ore deposits inferred from data of mineral assemblage and fluid inclusion range from $10^{-11.0}-10^{-16.1}$1bars. Fluid pressure estimated from fluid inclusions which reveal boiling evidence range from 30-190 bars during mineralization in Deogheun ore deposits.

덕흔ㆍ法田鑛山의 金-銀鑛化作用

Hee In Park(朴喜寅),Jeong Hwang(黃政),Deog Lae Kim(金悳來) 대한자원환경지질학회 1990 자원환경지질 Vol.23 No.1

Gold-silver deposits of Deogheun and Beopjeon mines are composed of veins emplaced in Jurassic granite batholith. Based on ore structure and ore mineralogy, four distinct stages of mineral deposition are recognized in these ore deposits. Gold and silver minerals in Deogheun and Beopjeon-A ore deposits are precipitated in stage Ⅲ and stage Ⅱ, respectively. Mineral constituents of ores from these deposits are pyrite, sphalerite, arsenopyrite, pyrrhotite, chalcopyrite, galena, tetrahedrite, electrum, quartz and rhodochrosite. Cubanite, argentite and pyrargyrite occur only in Deogheun ore deposits. Ag content of electrum range from 42 to 66 atomic % in both ore deposits. Filling temperature of fluid inclusion from both ore deposits are as follows ; stage Ⅰ, 211-289℃ ; stage Ⅱ, 205-290℃ ; stage Ⅲ, 190-260℃ ; stage Ⅳ, 136-222℃ in Deogheun ore deposits. In Beopjeon-A ore deposits, stage Ⅰ, 255-305℃ ; stage Ⅱ, 135-222℃ ; stage Ⅲ, 148-256℃ ; stage Ⅳ, 103-134℃. Salinities of fluid inclusions range from 1.6-8.5 wt.% equivalent NaCl in both ore deposits. Sulfur fugacities through stage Ⅱ and Ⅲ in Deogheun ore deposits inferred from data of mineral assemblage and fluid inclusion range from 10-11.0-10-16.1 bars. Fluid pressure estimated from fluid inclusions which reveal boiling evidence range from 30-190 bars during mineralization in Deogheun ore deposits.

大華 및 敦山 重石ㆍ모리브덴 鑛床의 流體包有物

Hee In Park(朴喜寅),Suck Won Choi(崔錫源),Deog Lae Kim(金悳來) 대한자원환경지질학회 1985 자원환경지질 Vol.18 No.3

Mineralization of Daehwa and Donsan W-Mo deposits can be devided into three distinct depositional stages on the basis of mineral paragenesis and flnid inclusion studies ; stage Ⅰ, deposition of oxides and silicates ; stage Ⅱ, deposition of base-metal sulfides and sulfosalts with carbonates; stageⅢ, deposition of barren calcite and fluorite. Tungsten, molybdenum and tin mineralization occurred in stage Ⅰ. Fluid inclusion studies reveal that ore fluid of stage Ⅰ were homogeneous H₂O-CO₂ fluids containing 3.5~14.6 mol % CO₂. Minimum temperature and pressure of stage Ⅰ ore fluids were 240℃ and 500 bars respectively. Salinities of aqueous type Ⅰ inclusions in minerals of stage Ⅰ range from 3.7 to 7.6 wt. % equi. NaCl, whereas those of CO₂-containing type Ⅲ inclusions range from 0.3 to 4.4 wt. %. Temperatures of stage Ⅱ ore fluids range from 200 to 305℃ on the whole and salinities were in the range of 3.2~7.2 wt. %. Homogenization temperatures of fluid inclusions in calcite and fluorite of stage Ⅲ range from 114 to 186℃ and salinities were in the range of 0.9~4.3 wt. %. Sulfur fugacities during stage Ⅱ deduced from mineral assemblages and tamperature data from fluid inclusions declined from earlier to later in the range of 10⁻¹¹⁸~10⁻¹⁸ atm. Fluid inclusion evidences suggest that the dominance of CO₂ in ore fluid during W-Mo mineralization is the characteristic features of Cretaceous W-Mo deposits of central district of Korea compared to those of Kyeongsang basin district.

大華 및 敦山 重石 · 모리브덴 鑛床의 鑛石과 鑛物共生關係

Hee In Park(朴喜寅),Suck Won Choi(崔錫源),Deog Lae Kim(金悳來) 대한자원환경지질학회 1985 자원환경지질 Vol.18 No.1

The Daehwa and Donsan tungsten-molybdenum deposits are composed of numerous fissure-filling veins developed in Precambrian gneiss and Cretaceous granite and quartz porphyry. K-Ar age of biotite in granite and that of muscovite in ore veins are 105±5 Ma and 88.2~88.6 Ma respectively. Occurrence of ore deposits shows that relevant igneous rock is possibly quartz porphyry rather than above mentioned granite in temporal view point. Vein structure and mineralogy suggest that ore veins were formed by continuous vein filling, not by repeated mineralization. Three distinct depositional stages with decreasing age can be devided on the basis of mineral paragenesis and fluid inclusion studies: Stage Ⅰ, deposition of oxides and silicates; stage Ⅱ, deposition of base-metal sulfides and sulfosalts with carbonates; stage Ⅲ, deposition of barren calcite and fluorite. Tungsten, molybdenum and tin mineralization occurred in stage Ⅰ.