Temperatures and oxygen isotopic compositions of hydrothermal fluids for the Takatori tungsten-copper deposit, Japan

Yasuhiro Shibue, Hitoshi Chiba, Minoru Kusakabe, Yuichi Morishita

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Fluid inclusion and oxygen isotope studies are performed to obtain temperatures and oxygen isotopic compositions of hydrothermal fluids for the vein-type tungsten-copper deposit at Takatori in Ibaraki Prefecture, Japan. Temperatures of the hydrothermal fluids are calculated from fluid inclusion data. The calculation incorporates the effects of the salinity, gas concentration, and fluid pressure. The fluid temperatures range from 370° to 460°C. For these calculations, this study obtains a density equation for H2O-NaCl-CO2 solution at the vapor-liquid two-phase boundary. Then the present study combines the obtained equation with the equation of state by Bowers and Helgeson (1983). The fluid temperatures determined in this study are applied to the calculation of oxygen isotopic compositions of the hydrothermal fluids. The calculation of the oxygen isotopic compositions is based on the oxygen isotope analyses of vein quartz. The oxygen isotopic compositions of vein quartz range from +13.5 to +14.4 ‰ relative to SMOW. Then, the oxygen isotopic compositions of the hydrothermal fluids in equilibrium with the vein quartz are calculated to be from +9.7 to + 10.5 ‰. These δ 18Ofluid values agree with those of magmatic fluids derived from the ilmenite-series granitic rock, which is related to the mineralization.

Original languageEnglish
Pages (from-to)101-110
Number of pages10
JournalResource Geology
Volume55
Issue number2
DOIs
Publication statusPublished - Jun 1 2005

Keywords

  • Density
  • Fluid inclusion
  • HO-NaCl-CO solution
  • Oxygen isotope
  • Takatori tungsten-copper deposit
  • Vein quartz

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology

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