BORON ISOTOPIC COMPOSITIONS OF SHIMOGAMO HOT-SPRINGS, IZN, JAPAN

Citation
T. Oi et al., BORON ISOTOPIC COMPOSITIONS OF SHIMOGAMO HOT-SPRINGS, IZN, JAPAN, Geochemical Journal, 27(3), 1993, pp. 147-154
Citations number
37
Categorie Soggetti
Geosciences, Interdisciplinary
Journal title
ISSN journal
00167002
Volume
27
Issue
3
Year of publication
1993
Pages
147 - 154
Database
ISI
SICI code
0016-7002(1993)27:3<147:BICOSH>2.0.ZU;2-9
Abstract
Hot spring waters in Shimogamo, Izu Peninsula, Japan, were analyzed fo r the stable isotopes of boron as well as for chemical compositions. T he boron isotopic ratios, B-11/B-10, of the waters range from 4.190 to 4.216, corresponding to the variation in delta(11)B from +36.2 to +42 .6 permil. These values are very high compared to those of hot spring waters in other areas on the Japanese islands and close to that of sea water. The results of the isotopic and chemical analyses indicate tha t the Shimogamo hot spring waters are mixtures of surface water and a deep geothermal brine directly derived from sea water through the inte raction with heated silicate rocks.