6:15 PM - 7:30 PM
[HTT31-P09] Geochemical maps of river waters in Toyama Prefecture: major and trace element distributions and Sr isotope signatures
The 87Sr/86Sr ratios of river waters varied from 0.70594 to 0.70989. The highest value was obtained in the upper stream of Shogawa, and the lowest value was found in a Tateyama stream. The relatively lower 87Sr/86Sr ratios were found in the eastern part of the studied area, Kurobegawa and Jyogannjigawa, where there are input of hot spring waters to rivers. In the western part of the studied area, we found strong correlations between Na+ and Cl- and between Cl- and δ18O, suggesting the influence of the sea salt on river water quality. However, such influence of the sea salt on river water quality cannot be identified from 87Sr/86Sr ratio. We will present geochemical maps on 7 major elements, 15 trace elements, DIC, δ18O, and Sr isotopes in a poster session, and discuss water circulation patterns recharged from high-altitude areas and anthropogenic and geologic influence on water quality based on these data set.