Sulfur isotopic study of the Toyoha deposit, Hokkaido, Japan - Comparison between the earlier-stage and the later-stage veins -

Morihisa Hamada, Akira Imai

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

The sulfur isotopic ratios (δ34S) of ore minerals from the Toyoha deposit, Hokkaido, one of the largest Pb-Zn-Ag polymetallic vein-type deposits in Japan, were studied. More than 90% of the δ34S values of the studied sulfide minerals collected from the Toyoha deposit range from +5 to +9‰, with an average of approximately +7‰ irrespective of the mineral species, veins, elevations, depth, mineralization stages and mineral assemblages. Relatively uniform δ34S values obtained in this study suggest that the reduced aqueous sulfur species predominated over the oxidized sulfur in the ore solution throughout the mineralization stages. Thus, the source of sulfur for the ore sulfides is postulated to be magmatic. The temperature obtained from the fluid inclusion study and the temperature of the sulfur isotopic geothermometer are not consistent. This suggests that each mineral precipitated under disequilibrated conditions with respect to the sulfur isotope. The change in redox conditions presumably encountered between the mineralization stages did not account for the isotopic fluctuations since the isotopic exchanges between the oxidized and reduced aqueous sulfurs are much slower than the rate of oxidation of the ore solution.

Original languageEnglish
Pages (from-to)113-122
Number of pages10
JournalResource Geology
Volume50
Issue number2
DOIs
Publication statusPublished - Jan 1 2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geology
  • Geochemistry and Petrology

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