Geochemical micro-behavior of natural U-series nuclides in granitic conglomerate from the Tono mine, central Japan.

Kanai, Yutaka; Okuyama, Yasuko; Seo, Toshihiro; Sakamaki, Yukio

doi:10.2343/geochemj.32.351

Cited by 12 publications

(3 citation statements)

References 20 publications

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“…The geology, geochemistry, and hydrology of the Tono Uranium Deposit and surrounding area have been extensively described (Yoshida et al, 1994;Kanai et al, 1998;Iwatsuki and Yoshida, 1999;Iwatsuki et al, 2001Iwatsuki et al, , 2005Takahashi et al, 2002;Arthur et al, 2006;Sasao et al, 2006). The deposit is located in central Japan $40 km NE of Nagoya at the base of a 150 m deep sedimentary sequence.…”

Section: Site Descriptionmentioning

confidence: 99%

Microbial carbon cycling in oligotrophic regional aquifers near the Tono Uranium Mine, Japan as inferred from δ13C and Δ14C values of in situ phospholipid fatty acids and carbon sources

Mills

Amano

Slater³

et al. 2010

Geochimica et Cosmochimica Acta

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Section: Site Descriptionmentioning

confidence: 99%

Microbial carbon cycling in oligotrophic regional aquifers near the Tono Uranium Mine, Japan as inferred from δ13C and Δ14C values of in situ phospholipid fatty acids and carbon sources

Mills

Amano

Slater³

et al. 2010

Geochimica et Cosmochimica Acta

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“…The Tono Natural Analogue Project is aimed at characterizing geological, hydrological and geochemical processes that have effectively immobilized U within the Tono uranium deposit in Gifu Prefecture, central Japan, for more than 10 million years [8][9][10][11]. Uranium is mainly associated via sorption or co-precipitation reactions with clay minerals, zeolites, pyrite, carbonates and lignite at Tono deposit.…”

Section: Introductionmentioning

confidence: 99%

Solubility constraints on uranium concentrations in groundwaters of the Tono uranium deposit, Japan

Iwatsuki¹,

Arthur²,

Ota³

et al. 2004

Radiochimica Acta

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Natural analogue / Uranium deposit / Long-term geochemical condition / Uranium solubility / Safety assessment Summary.A key concept underpinning most safety assessments of geological disposal systems for high-level nuclear wastes is that the maximum aqueous concentrations of actinide elements released from the waste will be limited by the solubility of the corresponding tetravalent oxide or hydrous oxide. The validity of this concept for U is evaluated in the present study using hydrochemical and mineralogical data from the Tono uranium (U) deposit in Gifu Prefecture, Japan. In addition, the long-term stability of U mineralization in the Tono deposit is assessed in terms of plausible range of U solubilities in paleogroundwaters migrating through the deposit.A thermodynamic evaluation of the aqueous-speciation and solubility behaviour of U indicates that U concentrations in the coexisting groundwaters greatly exceed the solubility of both uraninite [UO 2 (c)] and coffinite [USiO 4 (c)]. The dissolved U concentrations appear instead to be controlled by the solubility of amorphous hydrous U(IV) oxide [UO 2 (am)], which is metastable with respect to uraninite. Mineralogical and microbiological investigations suggest that pH-E h conditions similar to those observed presently in groundwaters of the lower Toki Lignite-bearing Formation (pH ≈ 8-10; E h ≈ −250-−410 mV) have been buffered, possibly since the present geological structure formed about 5-0.7 Ma, by microbial sulphate reduction and precipitation/dissolution of calcite. If so, corresponding U concentrations controlled by UO 2 (am) solubility are calculated to have been in the range of 10 −6.1 and 10 −8.7 mol kg −1 depending on the possible environmental conditions, i.e., E h , pH and carbonate concentration.

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“…• Palmottu Lake 근처 화강암 분포 지역 내에 우라늄-토륨 광상의 정량적 특성 (Iwatsuki et al, 2004;Kanai et al, 1998;Nohara et al, 1992) (Bernhard et al, 1996), 이후에 결정질 화강암반 지하수에서도 지배적 인 우라늄 화학종인 것으로 확인되었으며 (Baik et al, 2015;Schemeide et al, 2014)…”

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Natural Analogue Study on the Disposal of Radioactive Waste Using Uranium Deposits and Geochemical Behaviors of Uranium

Baik,

Ju,

Jeong

et al. 2023

Econ. Environ. Geol.

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In this study, we reviewed and summarized comprehensive roles and importance of natural analogue studies for demonstrating the safety and improving the reliability of the safety for the deep geological disposal of high-level radioactive waste. We also investigated domestic and foreign status of natural analogue studies in order to study and substantiate complex and various radionuclide behaviors in subsurface disposal environments. In addition, we investigated and uranium behaviors in groundwater and rock in uranium deposits including domestic uranium deposits in Ogcheon Metamorphic Belt and biogeochemical interactions in geological environments. Although there are many limitations and uncertainties in directly using the information and data for uranium behaviors obtained from uranium deposits in the disposal safety assessment, the information and data can be utilized in the disposal safety assessment and safety case construction both in qualitative and partly quantitative ways.

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Geochemical micro-behavior of natural U-series nuclides in granitic conglomerate from the Tono mine, central Japan.

Cited by 12 publications

References 20 publications

Microbial carbon cycling in oligotrophic regional aquifers near the Tono Uranium Mine, Japan as inferred from δ13C and Δ14C values of in situ phospholipid fatty acids and carbon sources

Microbial carbon cycling in oligotrophic regional aquifers near the Tono Uranium Mine, Japan as inferred from δ13C and Δ14C values of in situ phospholipid fatty acids and carbon sources

Solubility constraints on uranium concentrations in groundwaters of the Tono uranium deposit, Japan

Natural Analogue Study on the Disposal of Radioactive Waste Using Uranium Deposits and Geochemical Behaviors of Uranium

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