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Concentrations of major-elements, stable isotopes, tritium and bubble gas components including carbon and hydrogen isotope of methane were determined on water samples collected from rivers, springs, hot or mineral springs and drilled wells throughout the distribution areas of acidic rocks such as the Nohi-rhyolitic rocks, central Japan, and the Abukuma granodioritic rocks, northeast Japan. As a studied area, several types of aquifer lithologies were selected including the Nohi-rhyolitic welded tuff, Mino-sedimentary rocks and granitic rocks in the Nohi district, and including granodiorite, Takanuki-biotite schist and Yamizo sandstone in the Abukuma district. Groundwater type was divided into ten groups. The change mechanisms in characteristics of water quality were identified in each hydrological groundwater flow systems, such as local flow system and regional flow system, and were clarified by the analysis of dissolved constituents and tritium concentration. Stable isotope analysis indicates that both local and regional groundwaters of the two districts are originated in meteoric water. On the other hand, these have different residence time. Tritium concentration of the regional groundwaters are relatively low, which indicates that the residence time of those springs is longer than that of the water of local flow sys-

chikasui gakkaishi

Study on groundwater flow and chemical quality change during water circulation in hard rock body such as the Nohi rhyolitic and the Abukuma granodioritic rock body by water quality analysis, stable isotope and tritium analysis and gas analysis.