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Abstract
TADERA IKUGAWA DAWARA
Hot springs research in- stitute of Kanagawa Prefecture, Iryuda , Odawara, Kanagawa , Japan.
J. Hot Spring Sci.
Origin of deep hot spring waters in Kanagawa Prefecture is investigated based on compositions of major ions and oxygen-hydrogen isotope ratio. It is found that they are classified into three groups. Hot spring waters of group , which are seen in the coastal area, are considered to be originated from mixing of seawater and meteoric water. Their isotope ratios indicate that contribution of the latter is small. Hot spring waters of group , for their formation fossil seawater is probably involved, are divided into two subgroups based on the ratio of calcium ion in total cation. Hot spring waters of subgroup -A are characterized by the feature that calcium concentration is higher than that expected from the gypsum precipitation model. It is supposed that a cation exchange occurs be- tween the sodium ion in the rock and the calcium ion in the water. Those hot springs are seen in the central and southwestern parts of the Prefecture. On the other hand, hot spring waters of subgroup -B show lower calcium concentration than that expected, that is, a reverse cation exchange that causes dissolution of calcium-carbonate is considered to have taken place in the course of their formation. They are distributed in the northeast- ern part of the Prefecture. Hot spring waters of group which exist around Tanzawa Mountains are considered to consist of groundwater recharged by rainwater. It is sup- posed that major chemical ingredients are supplied not by the present or fossil seawater, but by the contents in the stratum where the hot waters yield. This assumption is sup- ported by the geology of the stratum and the groundwater flow inferred from the water levels, as well as by geographical distribution of the isotope ratios.
Key words : deep hot spring, fossil seawater, cation exchange reaction, groundwater flow
Kazuhiro I , Joji K and Kei O
Origin of Deep Hot Spring Waters in Kanagawa Prefecture, Japan
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