Sulfur isotope ratios of some Japanese skarn deposits.

Sulfur isotope ratios of the Akatani, Iide and Waga-Sennin skarn deposits, and their bearing on mineralizations in the "Green Tuff" region, Japan.

“…filling temperature of 250 to 315°C, and salinity of 1.6 to 4.5 wt % NaCI equivalent. , 1976), and other deposits (SHIMAZAKI and YAMAMOTO, 1979). …”

“…The only available data to date include TATSUMI (1965) on the Osarizawa and Ani Cu vein deposits, Yakumo Mn-Zn-Pb vein deposits, Taishu Zn-Pb vein deposits and Chichibu Cu-Zn-Pb-Fe skarn deposits, Kwwosu and NAKAI (1971) on the Kamioka Zn-Pb skarn deposits, KiYosu (1974) on the Toyoha Zn-Pb vein deposits, YAMAMOTO (1974a) on the Akenobe Cu-Zn-Pb-Sn-W vein deposits, YAMAMOTO (1976) on the Mihara Cu Fe skarn deposits, Kiyosu (1977) on the Taishu Zn-Pb vein deposits, SHIMAZAKI and YAMAMOTO (1979) on the Yoshioka Cu skarn deposits, Tsumo Cu-Zn-Pb W skarn deposits, Kawayama Cu-Zn skarn deposits, Kuga, Fujigatani, Kiwada and Kagata W(-Cu) skarn deposits and Hoei Zn Cu-Sn skarn deposits, and ISHIHARA et al (1981) on the Akenobe vein deposits.…”

“…In order to collect information as much as possible on the ore-forming process of hydro thermal deposits, the present writers have planned to determine sulfur isotope ratios of representative deposits in Japan (SHIMAZAKI and YAMAMOTO, 1979).…”

“…In the previous paper (SHIMAZAKI and YAMAMOTO, 1979), studied deposits were selected because some features in the deposits suggest relatively reducing environments estab lished at the time of mineral deposition. The reducing environments certify the predominance of reduced sulfur species in the ore-forming solutions, and mostly negative &34S values (+0.7 to -12.2%o) obtained for sulfides are thought to be close to those for total sulfur in the solu tions responsible for the deposits.…”

Fractionation of sulfur isotopes and selenium between coexisting sulfide minerals from the Besshi deposit, Central Shikoku, Japan

“…The apparent discrepancy might be due to the fact that we have a strict criterion for sulfur isotope equilibrium among sulfide minerals, but not-for selenium equilibrium. Shimazaki and Yamamoto (1979) studied sulfur isotope fractionation between pyrrhotite and chalcopyrite, which are believed to have been formed primarily and almost simultaneously, in eleven pairs from Japanese skarn deposits. The obtained A34Spo.cp values of-1.2 to + 0.6 per mil, with a mean of-0.20 per mil, also indicate isotope disequilibrium in most pairs.…”