The Dae Hwa tungsten-molybdenum mine, Republic of Korea; a geochemical study

So, Chil–Sup; Shelton, Kevin L.; Seidemann, David E.; Skinner, Brian J.

doi:10.2113/gsecongeo.78.5.920

Cited by 26 publications

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“…The ore vein mineral paragenesis determined by So et al (1983b) and modified by Shelton (1984) can be divided into three stages: (1) molybdenite-wolframitc, (2) iron sulfide-scheelite, and (3) late carbonate. Figure 3 shows the mineral paragenesis of the Dae Hwa W-Mo deposits and a corresponding temperature scale based on fluid inclusion studies by So et al (1983b).…”

Section: Mineral Paragenesismentioning

confidence: 99%

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Stable isotope studies of the Dae Hwa tungsten-molybdenum mine, Republic of Korea; evidence of progressive meteoric water interaction in a tungsten-bearing hydrothermal system

Shelton¹,

Taylor²,

So³

1987

Economic Geology

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The Dae Hwa W-Mo mine is located approximately 100 km southeast of Seoul within the Precambrian metamorphic belt of the southern Korean peninsula. The major ore minerals, wolframite, scheelite, and molybdenite, together with minor cassiterite, chalcopyrite, and bismuthinite, occur within fissure-filling quartz veins contained within Precambrian granitic gneiss adjacent to a granitic stock of Cretaceous age. K-Ar dates of 88 ___ 2 m.y. for vein muscovite suggest a Late Cretaceous age for W-Mo mineralization.The ore mineral paragenesis can be divided into three distinct stages: a molybdenite-wolframitc stage (400ø315ø), an iron sulfide-scheelite stage (315ø230ø), and a late carbonate stage (230ø150ø). The •so values of vein minerals are: quartz, 10.6 to 11.4 per mil; muscovite, 8.2 per mil; cassiterite, 2.9 per mil; wolframite, 4.0 to 4.3 per mil; color-zoned scheelite, -7.3 to 2.2 per mil (cores = -0.8-+2.2%0, edges = -7.3--2.7%o); siderite, 11.8 per mil; dolomite, 7.7 to 10.0 per mil; calcite, 5.7 to 9.3 per mil. There is a nearly monotonic decrease in calculated $•So values of hydrothermal waters with decreasing temperature in the Dae Hwa hydrothermal system, from values of •6 per mil for quartz-muscovite-molybdenite-cassiterite-wolframite deposition, to • 3.5 to 0.0 per mil for iron sulfide-early scheelite mineralization, to -3.5 to -7.0 per mil for late scheelite-carbonate deposition. We believe the decrease of •so water values with paragenetic time and decreasing temperature represents the progressively increasing importance of meteoric water interaction in the Dae Hwa tungstenmolybdenum hydrothermal system.The measured and calculated ranges of $D values of inclusion fluids and hydrous minerals are: -48 to -78 per mil for quartz-muscovite-molybdenite-wolframite deposition, -60 to -67 per mil for early scheelite deposition, and -71 to -101 per mil for late scheelite-carbonate deposition. The hydrogen and oxygen isotope compositions of hydrothermal fluids at Dae Hwa are consistent with progressive mixing of a magmatic or highly exchanged meteoric water (exchanged with granitic rocks over a series of temperatures at variable, but low water to rock ratios) with an unexchanged meteoric water ($D = -140%o). The stable isotope composition of the tungsten-molybdenum-mineralizing fluid is controlled predominately by the host granitic rocks.Sulfur isotope analyses of sulfide vein minerals suggest an igneous source of sulfur with a $34S•s value near 3.0 per mil. Together with the hydrogen and oxygen isotope data, they indicate that deposition of molybdenite, wolframite, and scheelite occurred during a period of declining temperatures from 400 ø to 230øC in response to inundation of an original magmatic system with low-temperature waters of meteoric origin. Differences in mineralogy, paragenesis, and $•so values of hydrothermal fluids between W-Mo (scheelite rich) and W-base metal (wolframite rich) vein-type deposits may reflectdifferences in their postwolframite deposition interactions with meteoric waters. The hydrothe...

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Section: Mineral Paragenesismentioning

confidence: 99%

“…a granitic stock intruded Precambrian granitic gneiss to a depth of emplacement near 1,250 m (So et al, 1983b). a granitic stock intruded Precambrian granitic gneiss to a depth of emplacement near 1,250 m (So et al, 1983b).…”

Section: Model For Ore Formation At Dae Hwamentioning

confidence: 99%

Stable isotope studies of the Dae Hwa tungsten-molybdenum mine, Republic of Korea; evidence of progressive meteoric water interaction in a tungsten-bearing hydrothermal system

Shelton¹,

Taylor²,

So³

1987

Economic Geology

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“…tungsten-molybdenum skarns (Pokalov, 1977). So et al, 1983aSo et al, , 1983bShelton et al, 1987). Roedder, 1971;Hall et al, 1974;Ivanova et al, 1978;Kamilli, 1978;Bloom, 1981;MacDonald and Spooner, 1981;White et al, 1981;Shelton et al, 1983Shelton et al, , 1986Shelton et al, , 1987So et al, 1983aSo et al, , 1983bLang and Eastoe, 1988).…”

Section: Molybdenum-bearing Skarns Commonly Occur As Copper-molybdenumentioning

confidence: 99%

Solubility of molybdenite and the transport of molybdenum in hydrothermal solutions

Cao

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“…Finally, the Dae Hwa tungsten-molybdenum deposit of South Korea is associated with 'I-type' granite and is famous for its large zoned scheelite crystals. The scheelite zones contain primary fluid inclusions that record a progressive outward decrease in homogenisation temperature (400-200 °C), which on the basis of δ 18 O, δD and δ 34 S was interpreted to reflect dilution of a magmatic fluid by meteoric water (So et al, 1983;Shelton et al, 1987). Noble gases analysed in a representative zoned scheelite crystal have a maximum 3 He/ 4 He of 2.7 Ra and show inter-zonal variation that is broadly correlated with δ 18 O and fluid inclusion homogenisation temperature (Burgess et al, 1992;Stuart et al, 1995).…”

Section: Tungsten-bearing Ore Depositsmentioning

confidence: 99%

Noble Gases and Halogens in Fluid Inclusions: A Journey Through the Earth’s Crust

Kendrick

Burnard²

2013

Advances in Isotope Geochemistry

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The Dae Hwa tungsten-molybdenum mine, Republic of Korea; a geochemical study

Cited by 26 publications

References 0 publications

Stable isotope studies of the Dae Hwa tungsten-molybdenum mine, Republic of Korea; evidence of progressive meteoric water interaction in a tungsten-bearing hydrothermal system

Stable isotope studies of the Dae Hwa tungsten-molybdenum mine, Republic of Korea; evidence of progressive meteoric water interaction in a tungsten-bearing hydrothermal system

Solubility of molybdenite and the transport of molybdenum in hydrothermal solutions

Noble Gases and Halogens in Fluid Inclusions: A Journey Through the Earth’s Crust

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