Contact Point of Hot Spring and Groundwater

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Graduate School of Life and Environmental Sciences, University of Tsukuba, Ibaraki , Japan.

In order to clarify the contact point of hot spring and groundwater, the author con- sidered the origin of hot spring waters using the diagram of hydrogen and oxygen isotopic ratios of hot spring waters. The diagram provides us an important information on the origin of hot spring waters from the hydrologic stand point of view. The results indicated that the hydrogen and oxygen isotopic ratios of the most of hot spring waters in Japan are plotted along the meteoric or local meteoric water lines on the diagram, suggesting the origin of such hot spring waters is mostly the meteoric water. However, the isotopic ratios of several hot spring waters are shifted from the meteoric water line and distribute along the mixing lines bounding the weighted mean value of the meteoric water and the end member sources such as sea water, fossil sea water and volcanic ther- mal waters. The mixing ratio of the component of meteoric water in such mixing waters is usually higher than that of the end member sources except a few particular examples.

Those results imply that it is reasonable to consider the origin of hot spring waters in Japan might be the meteoric water, namely the naturally occurring the hydrologic cycle water in basically. This stand point of view on the origin of hot spring waters maybe important for considering the conservation of hot spring resources in sustainable as shared resources as well as groundwater resources.

Key words : hot spring water, groundwater, stable isotopes, diagram, meteoric water line, origin

Tadashi T

Contact Point of Hot Spring and Groundwater

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