岡山大学 地球科学研究報告
Published by Okayama University Earth Science Reports Editorial Committee

西南日本内帯のろう石鉱床の硫黄同位体比

Yamamoto, Masahiro
Matsuda, Toshihiko
Nakagawa, Raiki
Abstract
Sulfur isotope ratios of pyrite and alunite from 5 Roseki deposits in the Inner Zone of Southwest Japan were determined. The δ34S values of all pyrite samples were in the range from -13.2 to +2.3%, the variation range for each deposit being within 8%. In each deposit δ34S values of alunite were always higher than those of pyrite, which may be interpreted as that alunite was precipirated under more oxidizing conditions than pyrite. Sulfur isotope rations of the Roseki pyrite showed a distribution similar to that of ore sulfur from skarn and vein deposits in the same Zone. This suggests that the origin of sulfur of the Roseki deposits is also host igneous rocks.
Keywords
sulfur isotope ratio
Roseki deposit
pyrite
alunite
ISSN
1340-7414
NCID
AN10506284