Hydrothermal bismuth mineralization of the Yucheon mine, South Korea: Oxygen and hydrogen isotope study

Seong Taek Yun, Chil Sup So, Sang Hoon Choi, Chul Ho Heo

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Hydrothermal bismuth ore deposit of the Yucheon mine, Kyongsang Basin, consists of quartz veins that filled fault-related fractures within Cretaceous sedimentary and Tertiary igneous rocks. Geologic setting and K-Ar age of muscovite (45.4± 0.6 Ma) indicate that the ore mineralization was associated with calc-alkaline granitism during the Early Tertiary. The three phases of mineralization are: early phase of pyrite+arsenopyrite+pyrrhotite+sphalerite+chalcopyrite; middle phase of base-metal sulfides +bismutninite+electrum+Bi-, Sb- and Te-bearing minerals; and late phase of fluorite+calcite in vugs. Based on fluid inclusion data and oxygen isotope geothermometry, the early mineralization phase was formed at higher temperatures (from 350° to 480°C) than the middle phase (230°-350°C). Such cooling was a result of progressive meteoric water mixing, likely due to further fracturing of veins. The main deposition of bismuth occurred as a result of cooling at temperatures between 250° and 350°C. The early to middle phases of mineralization occurred from high temperature fluid (up to 480°C) with the oxygen isotope composition and salinity of 5.5 to -1.4‰ and 0.7 to 18.4 wt.% eq. NaCl, respectively. The fluid experienced progressive meteoric water inundation toward the late mineralization (248-167°C; δ18Owater=-3.9 to -13.9‰; down to 1.9 wt.% eq. NaCl). The oxygen and hydrogen isotope data indicate the extensive evolution of hydrothermal fluids at Yucheon, characterized by the progressive increasing influx of an isotopically less-evolved (approaching the meteoric water composition) meteoric water into a deeply circulating highly-evolved meteoric water or a magmatic fluid.

Original languageEnglish
Pages (from-to)243-250
Number of pages8
JournalGeosciences Journal
Volume5
Issue number3
Publication statusPublished - 2001 Dec 1

Fingerprint

bismuth
hydrogen isotope
meteoric water
oxygen isotope
mineralization
fluid
cooling
geothermometry
arsenopyrite
fluorite
pyrrhotite
quartz vein
base metal
sphalerite
hydrothermal fluid
chalcopyrite
muscovite
ore deposit
igneous rock
fluid inclusion

Keywords

  • Bismuth mine
  • Fluid inclusion
  • Hydrothermal
  • Korea
  • Oxygen and hydrogen isotopes
  • Yucheon

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

Cite this

Hydrothermal bismuth mineralization of the Yucheon mine, South Korea : Oxygen and hydrogen isotope study. / Yun, Seong Taek; So, Chil Sup; Choi, Sang Hoon; Heo, Chul Ho.

In: Geosciences Journal, Vol. 5, No. 3, 01.12.2001, p. 243-250.

Research output: Contribution to journalArticle

Yun, Seong Taek ; So, Chil Sup ; Choi, Sang Hoon ; Heo, Chul Ho. / Hydrothermal bismuth mineralization of the Yucheon mine, South Korea : Oxygen and hydrogen isotope study. In: Geosciences Journal. 2001 ; Vol. 5, No. 3. pp. 243-250.
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