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Geochemical Journal
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Sulfur and oxygen isotope ratios of anhydrite from the Iratsu peridotite-hornblendite-epidote amphibolite complex, central Shikoku, Japan

Masahiro Yamamoto, Tsugio Shibata, Minoru Kusakabe
Geochemical Journal, Vol. 21, No. 5, P. 247-251, 1987

ABSTRACT

Sulfur and oxygen isotope ratios were determined for eight anhydrite samples (seven from silicate rocks and one from a marble) from the Iratsu peridotite-hornblendite-epidote amphibolite complex, central Shikoku, Japan. The δ34S values of anhydrite are in the range from +4.7 to +11.0‰. The δ18O values of anhydrite from the silicate rocks are in the range from +8.6 to +10.2‰ and that from the marble is +12.4‰. The fairly uniform δ18O values may indicate that these anhydrites were re-equilibrated with respect to oxygen isotopes with host rocks during the Sambagawa metamorphism. The rather variable, high δ34S values of anhydrite suggest that it is not cognate with the original rocks from which the host rocks were derived. The obtained δ34S values do not provide a straightforward solution concerning the source of sulfur for these anhydrites.

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