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Report No.

Estimation of groundwater residence time based on $$^{4}$$He, $$^{36}$$Cl at Horonobe area, Hokkaido

Nakata, Kotaro*; Hasegawa, Takuma*; Iwatsuki, Teruki

Groundwater residence time were inferred by $$^{4}$$He, $$^{36}$$Cl at Horonobe area, Hokkaido, Japan. Both estimated value based on $$^{4}$$He and $$^{36}$$Cl range from 2Ma to 10Ma for the groundwater deeper than -250m S.L. Those values correspond to sedimentation age of rock formations. This indicates the possibility that the groundwaters are in stagnant condition since sedimentation.



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