tem. Regional groundwaters of the Abukuma district show lower tritium concentration, which was caused by the nature of fracture. In the Nohi rhyolitic

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1 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. Ryoji NAGAE* Abstract 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- Tokai Regional Agricultural Administration Bureau, Ministry of Agriculture, Forestry and Fisheries.

2 tem. Regional groundwaters of the Abukuma district show lower tritium concentration, which was caused by the nature of fracture. In the Nohi rhyolitic area regional groundwater is easy to mix with local water by the occurence of cracks. From water-mineral equilibrium consideration, it is concluded that the groundwater of relatively low salinity, high ph with sodium bicarbonate type (NR and AR groups) was formed by dissolution of surrounding acidic rocks with consuming carbon dioxide contained in soil, flowing through fracture zone. Gero hot spring was formed by mixture of the Nohi regional groundwater with NaCl hydrothermal water related to the Yugamine rhyolitic rocks. Asahi village Agricultural Administration Bureau's well water which is NaC1 type with high salinity reveals an original water and gas composition, which indicates the characteristics of water included in the Mino sedimentary rocks. Inert gas composition indicates mixing of air saturated water with groundwaters included in the Mino sedimentary rocks. Yuya, Shitajima and Nigorigo waters have much contribution of air saturated water. Methane isotope ratios indicate that methanes in bubble gas were originated by mixture of thermogenic methane formed from kerogens with sedimentary methane in the Mino sedimentary rocks which is isotopically lighter. Bubble gas methane of Nigorigo has much contribution from volcanic or geothermal origin. Gas analysis indicates that the depth of fracture system related to water with coexisting free gas extends to the Mino sedimentary rocks beneath the Nohi rhyolitic rock body. NR group groundwater without carbon dioxide bubble gas flow within the Nohi rhyolitic rock. AR group groundwater distributed in the Abukuma granodioritic rock body recharged in mountainous area about 10 km apart, flow through permeable fault, interrupted by impermeable fault such as Yujimata fault and flow upward to surface. Key Words: Groundwater cycle, Granite, Rhyolite, Water quality change, Chemical composition, Gas composition, ISOtope composition.

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28 Coleman, M. L., T. J. Shepherd, J. J. Durham, J. E. Rouse and G. R. Moor (1982): Reduction of water with zinc for hydrogen isotope analysis., Analytical Chemistry, 54, Craig, H. (1961): ISOtopic variations in meteoric waters., Science, 133, Dansgaard, W. (1964): Stable isotopes in precipitation., Tellus, 16, D'Amore, F. and C. Panichi (1980): Evaluation of Deep Temperature of Hydrothermal Systems by a New Geothermometer., Geochimica et Cosmochimica Acta, 44, Fournier, R. 0. and J. J. Rowe (1966) : Estimation of Underground Temperatures from the Silica Content of Water from Hot Springs and Wet-steam Wells, Amer. J. Sci., 264, Fournier, R. 0. and A.H. Truesdell (1973): An Empirical Na-K-Ca Geothermometer for Natural Waters. Geochimica et Cosmochimica Acta, 37, Garrels, R. M. and C. L. Christ (1965): Solutions, Minerals and Equilibria, Harper & Row, New York, Evanston & London. Garrels, R. M. (1967) : Genesis of some groundwaters from igneous rocks. Res. Geochem., 2, Garrels, R. M. and F. T. Mackenzie (1967) : Origin of chemical compositions of some springs and lakes. In: Equilibrium Concepts in Natural Water System., Adv. Chem. Ser., 67, Giggenbach, W. F. (1986): The use of gas chemistry in delineating the origin of fluids discharged over the Taupo Volcanic Zone., Proceedings of Symposium 5, Int. Volc. Congress, Auckland, International Atomic Energy Agency ( ) : Environmental ISOtope Data, World Survey of ISOtope Concentration in Precipitation., Technical Report Series No.96, 117, 129, 147, 165, 192, 226. Jenden, P. D., I.R. Kaplan, R. J. Poreda and H. Craig (1988) : Origin of nitrogen-rich natural gases in the California Great Valley: Evidence from helium, carbon and nitrogen isotope ratios., Geochimica et Cosmochimica Acta, 52, Kiyosu, Y.(1986): Variation in N2/Ar and He/Ar ratios of gases from some volcanic areas in Northeastern Japan. (Note), Geochemical Journal, 19, Kiyosu, Y., N. Asada and Y. Yoshida (1992): Origin of light hydrocarbon gases from Matsukawa geothermal area in Japan., Geochemical Journal, 94, Koido, Y. (1991): A Late Cretaceous-Paleogene cauldron cluster; The Nohi Rhyolite, Central Japan., Bull. Volcanology, 53, Mizutani, Y., M. Tokiwa and H. Satake (1989) : Hydrogen and carbon isotopic composition of methane in N2 and CO2 rich gases from Central Japan., Geochemical Journal, 23, Nagae, R. and S. Koshiya (1992): Fracture system and groundwater of Granitic body in Southern Abukuma Plateau, Japan., 29th International Geological Congress, Symposium Session II Pacès, T. (1972) : Chemical characteristics and equilibration in natural water-felsic rock-co2 system., Geochimica et Cosmochimica Acta, 36, Sackett, W. M. (1978) : Carbon and hydrogen isotope effects during the thermocatalytic production of hydrocarbons in laboratory simulation experiments., Geochimica et Cosmochimica Acta, 42, Schoell, M. (1980) : The hydrogen and carbon isotopic composition of methane from natural gases of various origins., Geochimica et Cosmochimica Acta, 44, Stumm, W. and J.J. Morgan (1970): Aquatic Chemistry, John Wiley & Sons, Inc. Sugisaki, R., H. Anno, M. Adachi and H. Ui (1980) : Geochemical features of gases and rocks along active faults., Geochemical Journal, 14,

29 Sugisaki, R. (1962): Geochemical study of groundwater, J. Earth Sci., Nagoya Univ., 10,1-33. Sugisaki, R. (1987) : Behavior and origin of helium, neon, argon and nitrogen from active faults, J. Geophys. Res., 275, Tardy, Y. (1971) : Characterization of the principal weathering types by the geochemistry of waters from some European and African crystalline massifs., Chemical Geology, 7, T6th, J. A. (1962): A Theory of groundwater motion in small drainage basins in central Alberta, Canada., J. Geophys. Res., 67, No.11, Urabe, A., T. Tominaga, Y. Nakamura and H. Wakita (1985) : Chemical compositions of natural gases in Japan, Geochemical Journal, 19, Yoshioka, R. (1976) : Chemical composition of natural water in landslide area, Engineering Geology, 17, Yoshida, Y. (1991) : Geochemistry of the Nigorikawa geothermal system, southwest Geochemical Journal, 25, Hokkaido, Japan.,

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