Browse > Article
http://dx.doi.org/10.9719/EEG.2013.46.2.153

Genesis of the Ogcheon Gold-silver Deposit in Republic of Korea: Ore Minerals, Fluid Inclusion and Stable Isotope Studies  

Yoo, Bong Chul (Mineral Resources Research Department, Korea Institute of Geoscience and Mineral Resources)
Publication Information
Economic and Environmental Geology / v.46, no.2, 2013 , pp. 153-163 More about this Journal
Abstract
The Ogcheon Au-Ag deposit consists of two quartz veins that fill the NE or NW-trending fissures in the metasedimentary rocks of unknown age. The quartz veins occur mainly in the massive type with partially breccia and cavity. They can be found along the strike for about minimum 50 m and varied in thickness from 0.1 to 0.3 m. The mineralogy of quartz veins from the Ogcheon deposit is mainly composed of hydrothermal alteration minerals such as pyrite, quartz, sericite, chlorite, clay minerals and sulfides including pyrite, pyrrhotite, arsenopyrite, sphalerite, chalcopyrite and galena. Fluid inclusion data from quartz indicate that homogenization temperatures and salinity of mineralization range from 184 to $362^{\circ}C$ and from 0.0 to 6.6 wt.% eq. NaCl, respectively. These suggest that ore forming fluids were progressively cooled and diluted from mixing with meteoric water. Sulfur(${\delta}^{34}S$: 0.4~8.4‰) isotope composition indicates that ore sulfur was derived from mainly magmatic source although there is a partial derivation from the host rocks. The calculated oxygen(${\delta}^{18}O$: 4.9~12.1‰) and hydrogen(${\delta}D$: -92~-74‰) isotope compositions suggest that magmatic and meteoric ore fluids were equally important for the formation of the Ogcheon deposit and then overlapped to some degree with another type of meteoric water during mineralization.
Keywords
Ogcheon deposit; quartz vein; mineralization; fluid inclusion; stable isotope;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 Barret, T.J. and Anderson, G.M. (1988) The solubility of sphalerite and galena in 1-5 m NaCl solutions to $300^{\circ}C$. Geochim. Cosmochim.Acta., v.52, p.813-820.   DOI   ScienceOn
2 Bodnar, R.J. (1983) A method of calculating fluid inclusion volumes based on vapor bubble diameters and P-V-TX properties of inclusion fluids. Econ. Geol., v.78, p.535-542.   DOI
3 Bodnar, R.J. and Vityk, M.O. (1994) Interpretation of microthermometric data for $H_2O$-NaCl fluid inclusions: in De Vivo, B. and Frezzotti, M.L. eds., Fluid inclusions in minerals: Method and applications: Short Course International Mineralogical Assoc., p.117-130.
4 Gammons, C.H. and Williams-Jones, A.E. (1995) The solubility of Au-Ag alloy + AgCl in HCl/NaCl solutions at $300^{\circ}C$: New data on the stability of Au(I) chloride complexes in hydrothermal fluids. Geochim. Cosmochim. Acta., v.59, p.3453-3468.   DOI   ScienceOn
5 Kim, D.H., Chang, T.W., Kim, W.Y. and Hwang, J.H. (1978) Explanatory text of the geological map of Ogcheon sheet. Korea Research Institute of Geoscience and Mineral Resources. 21p.
6 Korea Mining Promotion Corporation (1990) Deposits of the Korea, p. 172-173.
7 KORES, (2012) http://www.kores.net/mcinfo/informineral_l.do,
8 Kwon, S.T. and Lee, D.H. (1992) Petrology and geochemistry of the Ogcheon metabasites in Poun, Korea. Jour. Petrol. Soc. Korea, v.1, p.104-123.
9 Lee, J.H. Kwon, S.H. Park, Y.D. Kwon, S.T. and Park, S.H. (2001) Pretectonic and posttectonic emplacements of the granitoids in the south central Okchon belt, South Korea: Implications for the timing of strike-slip shearing and thrusting. Tectonics, v.20, p.850-867.   DOI   ScienceOn
10 Lim, S.B., Chun, H.Y., Kim, Y.B., Lee, S.R. and Kee, W.S. (2007) Geological ages and stratigraphy of the metasedimentary strata in Hoenam-Miwon area, NW Okcheon belt. Journal of the Geological Society of Korea, v. 43, p. 125-150.   과학기술학회마을
11 Matsuhisa, Y. Goldsmith, R. and Clayton, R.N. (1979) Oxygen isotope fractionation in the system quartzalbite- anorthite-water. Geochimica et Cosmochimica Acta, v. 43, p. 1131-1140.   DOI   ScienceOn
12 Ohmoto, H. and Rye, R.O. (1979) Isotopes of sulfur and carbon. H.L. Barnes. Geochemistry of hydrothermal ore deposits. 2nd ed, Wiley-Interscience. New York. p.509-567.
13 Shepherd, T.J. Rankin, A.H. and Alderton, D.H.M. (1985) A practical guide to fluid inclusion studies. Blackie, 239p.
14 Yoo, B.C., Lee, J.K., Lee, G.J. and Lee, H.K. (2008) Fluid inclusion and stable isotope studies of Namseong and Manmyeong Au-Ag deposits. Conference of the geological science & technology of Korea, p.199.
15 Yoo, B.C and White, N.C. (2013) Mineralogy, fluid inclusion and stable isotope constraints on the genesis of the Namseong Au-Ag deposit, Republic of Korea. Geochemical Journal (in print).
16 Yoo, B.C. and You, B.W. (2011) Geopung copper deposit in Ogcheon, Chungcheongbuk-do: Mineralogy, fluid inclusion and stable isotope studies. Econ. Environ. Geol., v.44, p.193-201.   과학기술학회마을   DOI   ScienceOn