Gold-rich mesothermal vein deposits of the Republic of Korea; geochemical studies of the Jungwon gold area

Shelton, Kevin L.; So, Chil–Sup; Chang, Jinsu

doi:10.2113/gsecongeo.83.6.1221

Cited by 84 publications

(56 citation statements)

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“…Meteoric water models for numerous hydrothermal ore deposits have been adequate to explain low but variable δD values of mineralizing fluids (e.g., Shelton et al, 1988;Tornos and Spiro, 2000). However, these models cannot be successfully applied to the Poongjeon deposit because water-rock interaction by the passage of local meteoric waters through major fault zones or the contacts between different rock units in the same geologic pile cannot reasonably explain the large difference (of about 11‰) in δD values between the two quartz types.…”

Section: Stable Isotope Compositionsmentioning

confidence: 99%

Fluid inclusions and their stable isotope geochemistry of the carbonate-hosted talc deposits near the Cretaceous Muamsa Granite, South Korea

Shin

Lee

2006

Geochem. J.

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Microthermometric and stable isotope studies of fluid inclusions were conducted for the Poongjeon talc deposit which formed as alteration products of calc-silicate minerals during the retrograde stage of contact metamorphism related to the intrusion of the Cretaceous Muamsa Granite of South Korea. Two types of quartz vein are observed in the deposit. Vein I, which occurs in marble, is characterized by both mixing and unmixing process of fluid inclusions. Repeated boiling of carbonic fluids produced high X CO2 fluids abundantly and low X CO2 or aqueous fluids a little. Occasionally mixing took place between halite ± sylvite-bearing fluids and carbonic fluids. As for vein II, which occurs typically at points of amphibolite-metapelite contact, the fluid mixing model can be applied to the coexistence of abundant CH 4 ± H 2 O, H 2 O-CO 2 -CH 4 fluids with variable CH 4 /CO 2 ratios (X CH4 > 0.1), and minor high X CO2 fluid inclusions. The CH 4 -rich inclusions seem to be derived from the reheating of C-bearing metapelite during contact metamorphism.Occurrences of halite ± sylvite-bearing inclusions along trails in both vein I and II are chronologically behind other primary inclusions and are closely related to the talc mineralization. The mineralizing fluids would have been derived directly from a water-saturated crystallizing melt and the entrapment occurred between 150 and 700 bars at 260°-390°C. The δ 13 C CO2 values, 0.1-2.4‰, of inclusion fluids of vein I seem to have resulted from the isotopic exchange of magmatic carbon with 13 C-enriched CO 2 liberated from the decarbonation for calc-silicate formation. Distinctly lower δ 13 C CO2 values, -3.5 to -1.7‰, in vein II could have originated from the strong effect of metasediment-derived fluids. Higher δ 18 O H2O values of vein I and lower δD values of vein II, both of which belong to the magmatic water range, seem to have similar evolution history as δ 13 C values. Geologic structures such as faults and contacts between different rock units seem to have promoted infiltration, mixing, and unmixing of fluids of diverse origins.

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Section: Stable Isotope Compositionsmentioning

confidence: 99%

Fluid inclusions and their stable isotope geochemistry of the carbonate-hosted talc deposits near the Cretaceous Muamsa Granite, South Korea

Shin

Lee

2006

Geochem. J.

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“…A similar style of mineralization as found at Åkerberg (parallel and continuous thin veins, minor alteration and very low sulfide content, large gold-anomalous areas and gold distributed also between quartz veins, basically only gold and minor tungsten with, e.g., no tellurium or bismuth minerals present) appears to be quite rare also in a global perspective (Table 3). Although, certain intrusive-related quartz vein deposits in Korea [59] show several similarities with the Åkerberg deposit, even better analogues are the intrusion-related Mokrsko deposit in Bohemia and deposits in the Tombstone gold belt in Yukon. At Mokrsko, tightly spaced (less than 1 mm wide) and parallel quartz veinlets formed during an E-W compression [60,61].…”

Section: Classifying the åKerberg Gold Deposit: An Intrusion-related mentioning

confidence: 99%

Geology and Age Constraints on the Origin of the Intrusion-Related, Sheeted Vein-Type Åkerberg Gold Deposit, Skellefte District, Sweden

et al. 2012

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Abstract:The Early Proterozoic (~1.9 Ga) Skellefte mining district in northern Sweden hosts abundant base metal deposits, but there are also gold-only deposits. The Åkerberg gold ore is unusual given the noted lack of alteration, a scarcity of sulfides and gold associated with thin (mm-cm wide) parallel quartz veins hosted in a gabbro. The gold content is positively correlated with the density of quartz veins, but gold often occurs between veins and also in parts of the gabbro where there is no veining. The gabbro is intruded by a granodiorite and associated pegmatite bodies, and U-Pb dating of zircon and baddeleyite suggest that these lithologies developed close in time at around 1.88 Ga ago. There are no primary inclusions in quartz veins, but different types of secondary aqueous inclusions occur. The Åkerberg ore is interpreted as a sheeted vein complex, with veins constrained to tensional cracks induced when a granodioritic magma intruded the competent, sheet-like gabbro intrusion. It is suggested that unmixing of the felsic magma also produced pegmatite bodies and a gel-like melt which invaded fractures in the gabbro OPEN ACCESSMinerals 2012, 2 386 and deposited silica. In a comparison, the Åkerberg ore shares many characteristics with the intrusion-related style of gold mineralizations.

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“…They can provide information on the temperature, pressure, density and composition of the fluid at the time of trapping during mineralization. For example, Shelton et al (1988) studied fluid inclusions in gold vein deposits of the Jungwon Gold Area in the Republic of Korea and indicated that gold was deposited between 375-290 °C from relatively dilute fluids containing 15-25 mole percent CO2, similar to nearby Late Jurassic granodiorite.…”

Section: -4 Fluid Inclusions In Granitesmentioning

confidence: 99%

Geochimie et mineralogie des granites de la region de Hetai province de Guangdong Chine meridionale =

Yang¹

1993

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The Hetai Area, located in the western Guangdong Province of South China, has been affected by four orogenies, from the Caledonian (Early Paleozoic) to the Yanshanian (Late Mesozoic). Two major northeast trending faults, the Guangning-Loudin and the Wuchuan-Sihui, characterized by wide deformation zones, traverse the region. Granitic rocks, which cover about half the surface area, are related to each of the four orogenies. Previous regional studies have been premised on the importance of in situ granitization of Precambrian strata for the formation of the older granitic rocks as well as the formation of the Hetai gold deposits.This study discusses the genesis and evolution of ten granitic intrusions from the Hetai area based on their petrography, mineralogy and geochemistry. The granites of the Hetai Area are defined as "older granites" (Caledonian and Hercynian granites) and "younger granites" (Indosinian and Yanshanian granites) for comparison. Detailed field and microscopic observations show that all granitic rocks have a magmatic flow foliation. This foliation is overprinted by various degrees of solid-state deformation in the older (Caledonian and Hercynian) granite bodies.The geochemical analyses of granites also distinguish them into different types. The older granites are characterized mainly by peraluminous chemistry (A/CNK>1.05), high LILE/HFSE, HREE/LREE and a negative Eu anomaly, whereas the younger granites are characterized by slightly peraluminous and metaluminous chemistry (A/CNK<1.05), a significant change of LILE/HFSE, HREE/LREE and a negative Eu anomaly ranging from low to high with the calc-alkaline -> alkaline evolution of the magma. Comparison of the granites of the Hetai Area to those of well studied world areas by selected geochemical diagrams such as (Nb+Ta) vs (V+Sc) and Rb/Sr shows that the older granites are similar to S-type granite, but the younger granites are coincident with I-type and A-type (?) granites.Au contents are higher in younger granites than those in older granites. Au distributions in different type granites of the Hetai Area suggest that the granites derived Chemical analyses of biotite show that biotites from the older granites contain high FeO (>22%) and A1 2 C>3(>15%) but low MgO (<8%), TiO 2 (<3%) and SiO 2 (<36%), whereas those from the younger granites have high MgO (>8%), TiO 2 (>3%) and SiO 2 (>36%) but low FeO (<22%) and A1 2 O3 (<15%). In general, the biotites from older evolution of the different granites shows a geotectonic evolution from the peraluminous collision-type granites to mafic and calc-alkaline subduction-type granites finally to alkaline extension-type granites in the Hetai Area. IV RESUMECette thèse porte sur la genèse et l'évolution des roches granitiques de la région de Hetai et sur leurs relations possibles avec la minéralisation aurifère. Cette région de la Chine Méridionale est située à l'ouest de la Province de Guangdong. La Chine Méridionale a une histoire géotectonique complexe et l'étude des granites de la région de Hetai, qui...

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Gold-rich mesothermal vein deposits of the Republic of Korea; geochemical studies of the Jungwon gold area

Cited by 84 publications

References 0 publications

Fluid inclusions and their stable isotope geochemistry of the carbonate-hosted talc deposits near the Cretaceous Muamsa Granite, South Korea

Fluid inclusions and their stable isotope geochemistry of the carbonate-hosted talc deposits near the Cretaceous Muamsa Granite, South Korea

Geology and Age Constraints on the Origin of the Intrusion-Related, Sheeted Vein-Type Åkerberg Gold Deposit, Skellefte District, Sweden

Geochimie et mineralogie des granites de la region de Hetai province de Guangdong Chine meridionale =

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