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

Hydrogen and oxygen isotope ratios of thermal waters of Okayama Prefecture, Japan

Yamamoto Masahiro Okayama Gakugeikan High School
Ichimoto Hideo Okayama Gakugeikan High School
Komatsu Shinji Yamaguchi Branch, Oyo Corporation
Yamashita Ruka Graduate School of Science, Nagoya University
抄録
Hydrogen and oxygen isotope rations of thermal waters from 46 spas in Okayama Prefecture range from -62.6 to -29.2% in δD and from -10.0 to -4.4% in δ18O, respectively. The isotope rations indicate that all but one of the thermal water in Okayama prefecture are meteoric in origin. The Ofuku thermal water is the only exception, which is probably a mixture of seawater and meteoric water with the ratio of about 1. Sulfur isotope rations of dissolvel sulfate in the thermal waters range from -6.2 ti 59.3% in δ34S. The high δ34S values observed in some thermal waters may be due to bacterial reduction of sulfate.
キーワード
Hydrogen isotope ratio
Oxygen isotope ratio
Sulfur isotope ratio
Thermal water
Spa Okayama
ISSN
1340-7414
NCID
AN10506284