Computer Science
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47.1237k&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 47, Issue 7, pp.1237-1245
Computer Science
5
Scientific paper
Acid sulfate-chloride thermal water samples collected together with fumarolic gases from various volcanic areas in northeastern Japan were studied chemically and isotogdically. 34 S (COT) values of sulfate and hydrogen sulfide from these volcanic hot springs range from +4.0 to +31 and from -15.0 to -2.0% respectively, with 34 S ys value of +2.5 to +31. The 34 S of the sulfate in the more saline waters tends to become smaller with increasing ratio of SO 4 to Cl, although the chemical and isotopic composition of acid thermal water within some areas may be altered by secondary processes during the discharge of the thermal waters. This trend can be explained by the reaction of the volcanic gases, having S/Cl of 4 ~ 7 and total sulfur of ~0% in 34 S, with ground water at 200°C, and/or the removal of sulfide phase depleted in 34 S from the acid thermal water formed by the disproportionation of volcanic sulfur. The sulfur species in acid sulfate-chloride thermal water are shown to be volcanic exhalations.
Kiyosu Yasuhiro
Kurahashi Makoto
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