| 2004 Denver Annual Meeting (November 7–10, 2004) | |
| Paper No. 242-19 | |
| Presentation Time: 1:30 PM-5:30 PM | ||
BEHAVIOR OF URANIUM BEARING GROUNDWATER IN NEOGENE SEDIMENTARY ROCKS; OBSERVATION AT THE KANAMARU DISTRICT, YAMAGATA, JAPAN | ||
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SEKI, Yoji1, NAITO, Kazuki2, KAMEI, Atsushi3, TSUKAMOTO, Hitoshi4, and WATANABE, Yoshio1, (1) Research Center for Deep Geological Environments, National Institute of Advanced Industrial Sci and Technology, 1-1-1 Higashi, Tsukuba Central 7th, Tsukuba, 305-8567, Japan, yoji-seki@aist.go.jp, (2) Research Center for Deep Geological Environments, National Institute of Advanced Industrial Sci and Technology, Central-7, 1-1-1 Higashi, Tsukuba, 305-8567, Japan, (3) Interdisciplinary Faculty of Science and Engineering, Shimane Univ, Matsue, 690-8504, Japan, (4) Geol Survey Japan, 1-1-3 Higashi, Tsukuba, Ibaraki, 305-8567, Japan To study the groundwater flow system bearing uranium, quasi-monthly water quality measurements for traditional-type observation wells and seasonal water quality and pore-pressure measurements using multi-packer system were done in the Kanamaru district, northeastern Japan, where uranium anomaly in Neogene sedimentary rocks was known. Profiles of chemical parameters for water column of observatin wells show clear stratification especially in dry season, that is, stepwise change of lower pH and EC and higher DO and Eh in shallower part, and higher pH and EC and lower DO and Eh in deeper part. This stratification is confirmed much clearly by multi-packer system installed in a reference well. Higher uranium concentrations of around 2 ppb in groundwater are detected in well-waters sampled from the horizon of rock uranium anomaly, which reachs up to 100 ppm. Relatively lower uranium concentrations of around 0.1 ppb in well-waters are observed in deeper horizons in basement pre-Tertiary granitic rocks | ||
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2004 Denver Annual Meeting (November 7–10, 2004)
General Information for this Meeting | ||
| Session No. 242--Booth# 17 Environmental Geoscience (Posters) II Colorado Convention Center: Exhibit Hall 1:30 PM-5:30 PM, Wednesday, November 10, 2004 Geological Society of America Abstracts with Programs, Vol. 36, No. 5, p. 561 | ||
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