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Chem Geol 49:339–351Īndrews JN (1992) Mechanisms for noble gas dissolution by groundwaters. Finally, data on the concentrations and ratios of 3He to 4He in groundwater samples were used to determine the location of faults in the volcanic aquifer.Īndrews JN (1985) The isotopic composition of radiogenic helium and its use to study groundwater movement in confined aquifer. The helium component from the deep mantle is mixed into the groundwater under the Kumamoto Plain. These two groundwater flows were identified from the different helium isotope-ratios. One flow is buried by the Aso pyroclastic flow along the old Kase River the other is along the Tsuboi River Valley. The groundwater basin under the plain is divided into four small basins, based on the helium concentrations and isotope ratios, with two major groundwater flows. We used this method with samples from a confined aquifer formed by the deposition of pyroclastic flow in the Kumamoto Plain on the west side of Mt. Since it is very difficult to detect trace amounts of noble gases and helium with high accuracy in a 15-ml groundwater sample, dissolved gases were extracted and purified, then a high-resolution mass spectrometer was used for measurement and comparison with standard samples. The tracing method is based on measuring the concentrations of noble gases and the ratio of helium isotopes in groundwater samples. This study Investigates a tracing method using dissolved noble gases to survey the groundwater flow in a large groundwater basin.

Notsu valley