JavaScript requeired.
Geochemical Journal
Geochemical Journal An open access journal for geochemistry
Published for geochemistry community from Geochemical Society of Japan.

Sulfur isotope study of the Yatani Au-Ag and Zn-Pb vein-type deposits in Japan

Naotatsu Shikazono, Hidehiko Shimazaki
Geochemical Journal, Vol. 19, No. 5, P. 259-267, 1986


Sulfur isotopic compositions of sulfide minerals from the Yatani deposits which occur in the Green tuff region of Japan were determined separately for those from Zn-Pb and Au-Ag veins. δ34S values of Au-Ag veins are higher than those of Zn-Pb veins. The values for Zn-Pb veins and Au-Ag veins are ca. 0.5–4.5 ‰ and ca. 3–6 ‰, respectively. This difference in δ34S of Zn-Pb veins and Au-Ag veins is difficult to be explained by the equilibrium isotopic fractionation between aqueous reduced sulfur species and oxidized sulfur species at the site of ore deposition. The non-equilibrium rapid mixing of H2S rich fluid (deep fluid) with SO42- rich fluid (shallow fluid) is the most likely process for the cause of this difference. This fluid mixing can also explain the higher oxidation state of Au-Ag ore fluid and lower oxidation state of Zn-Pb ore fluid. Deposition of gold occurs by this mechanism but not by oxidation of H2S rich fluid.

All Issues

Current Issue:
Impact Factor: 1.0 (2023)
Submission to final decision: 9.6 weeks (2022)
Geochemical Society of Japan

page top