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Journal Articles

Chemical forms of uranium, thorium and trace elements in sedimentary rocks distributed in Horonobe area, Hokkaido

Kosemura, Takashi*; Honda, Teruyuki*; Mizuno, Takashi; Murakami, Hiroaki; Nomura, Masao*

Fisshion, Torakku Nyusureta, (26), p.16 - 20, 2013/00

We Analyze existence form of REE in the rock from HDB-6 borehole at the Horonobe Town, Hokkaido. As a result, U and Th is mainly sulfate at fault. REE is mainly silicate at fault.

Journal Articles

Natural analogue study on trace element migration in geological formation at Horonobe area, Japan

Iwatsuki, Teruki; Ishii, Eiichi; Mizuno, Takashi; Honda, Teruyuki*

Tokyo Toshi Daigaku Genshiryoku Kenkyusho Kenkyushoho, (36), p.1 - 13, 2010/07

Trace element analysis in deep rock formation of Horonobe area, Hokkaido was conducted to construct the estimation technique on trace element migration. The distribution of trace element in rock formations suggests that those has not migrate in wide area. However those concentration in and around several fault are inhomogenious indicating the faults has a role of migration path. The analysis of trace element concentration is available to estimate the migration path.

Journal Articles

Natural analogue study focused on trace elements of sedimentary and granitic rocks in Tono area, Gifu prefecture, Japan

Mizuno, Takashi; Nagata, Hiroshi; Iwatsuki, Teruki; Honda, Teruyuki*

Tokyo Toshi Daigaku Genshiryoku Kenkyusho Kenkyushoho, (36), p.14 - 24, 2010/07

This paper aims to understanding the behavior of the elements related to the change of the chemical properties of sedimentary rocks and granitic rocks distributed in the Tono area, Gifu prefecture, using natural analogue approach. As a result, in the sedimentary rocks, it is indicated that REE and U are migrated in response to the change of pH and/or redox condition. These elements will be dissolved from the rocks and introduced into clayminerals, carbonate minerals and phosphate minerals. On the other hand, ingranitic rocks, these elements do not show the systematical variation. It is needed to more detail analysis (ex. chemical analysis of each separated minerals) for understanding their behavior in the granitic rocks.

Oral presentation

Distribution and migration of U, Th and REE in the sedimentary rocks of Mizunami group

Nagata, Hiroshi*; Honda, Teruyuki*; Iwatsuki, Teruki; Mizuno, Takashi

no journal, , 

no abstracts in English

Oral presentation

Distribution and migration of U, Th and trace elements in Toki granite

Tsuboi, Mariko*; Honda, Teruyuki*; Iwatsuki, Teruki; Mizuno, Takashi

no journal, , 

no abstracts in English

Oral presentation

The Study of trace elements migration at fault

Nagata, Hiroshi*; Honda, Teruyuki*; Iwatsuki, Teruki

no journal, , 

Trace elements analysis have been carryed out to estimate the migration property of fault zone at Horonobe area, Hokkaido. The results show that the light Ln elements are highly sorped on the clay minerals in fault zone.

Oral presentation

Distribution and behavior of major and trace elements in sedimentary rocks originating in difference of geochemical environment

Nagata, Hiroshi*; Honda, Teruyuki*; Iwatsuki, Teruki; Mizuno, Takashi

no journal, , 

Trace element concentrations in sedimentary rocks were analyzed to estimate migration process at chemical weathering and carbonate filling part. The results show that the no migration was observed at chemical weathering part. On the oter hand, U and Th enrich at calcite filling part. The carbonate ligand generation possibly controls migration processes.

Oral presentation

Long-term evolution of hydrochemical condition and trace elements at Horonobe area, Japan

Iwatsuki, Teruki; Ishii, Eiichi; Honda, Teruyuki*

no journal, , 

Long-term evolution of hydrochemical condition and trace elements are inferred at Horonobe area, Japan. Hydrochemical conditions such as salinity, pH and Eh of groundwaters were estimated in each hydrogeological domain. On the other hand, concentration of trace elements in each hydrogeological domain are homogenious. This suggests that the trace elements had not migrated during long-term evolution of hydrochemical environments.

Oral presentation

Natural analogue study using U, Th, REEs to identify the pragmatic hydrogeological structure in sedimentary rock at Horonobe area, Japan

Iwatsuki, Teruki; Honda, Teruyuki*; Murakami, Hiroaki

no journal, , 

U, Th and REEs abundances in sedimentary rocks were analyzed to understand the long-term mobility of these elements and to develop the evaluation method of the pragmatic solutes transport path at Horonobe area, Japan. The detail analysis of peculiar points such as fracture and fault as a possible solutes transport path shows the accumulation and leaching of U, Th and REEs at some faults with connection and continuousness at specific depth. The fault and accompanied alteration possibly facilitates to leach and move the heavy-REEs (HREEs) from primary rock. Then those elements seem to have a tendency to concentrate into carbonate mineral vein in the fracture. The some clay-rich fault parts enriches in U, Th and light to medium-REEs (LREE-MREEs) compared with background rock. From the viewpoint of solutes transport, remarkable transport path is fracture and fault (fracture media) rather than rock matrix (porous media) in sedimentary rocks at the area.

Oral presentation

Study on behavior of trace elements by water-rock reaction in Toki granite

Hagiwara, Takeshi*; Honda, Teruyuki*; Mizuno, Takashi

no journal, , 

no abstracts in English

Oral presentation

Speciation of trace elements in Horonobe sedimentary rocks related with high level radioactive wastes disposal

Torigata, Kazufumi*; Honda, Teruyuki*; Iwatsuki, Teruki; Murakami, Hiroaki

no journal, , 

no abstracts in English

Oral presentation

A Study on speciation of trace elements in sedimentary rocks by neutron activation analysis incorporating sequential extraction method

Torigata, Kazufumi*; Honda, Teruyuki*; Iwatsuki, Teruki; Murakami, Hiroaki

no journal, , 

no abstracts in English

Oral presentation

Investigation for colloids in the groundwater of Horonobe URL, 1; Characterization of colloids in the groundwater by using ultra filtration

Amano, Yuki; Amamiya, Hiroki; Murakami, Hiroaki; Iwatsuki, Teruki; Terashima, Motoki; Mizuno, Takashi; Kirishima, Akira*; Kuno, Atsushi*; Sasaki, Takayuki*; Kubota, Takumi*; et al.

no journal, , 

no abstracts in English

Oral presentation

Behavior of trace elements in the fault and altered zones of the Toki granite

Arai, Yusuke*; Honda, Teruyuki*; Iwatsuki, Teruki; Nomura, Masao*

no journal, , 

Rare earth elements (REEs) in altered part and fault of Toki granite were analyzed to understand mobility in deep environment. REEs occurs in an oxidized minerals at altered part, in a carbonates and ion exchangeable minerals at fault, respectively. Light REEs tend to be involved in sulphide or phosphorate minerals and heavy REEs seem to be in clay, carbonate minerals. These results imply that the migration of minor actinoides in granite might be retarded by such minerals in fracture and fault.

Oral presentation

Natural analogue study targeting the fault and altered zones of the Toki granite

Arai, Yusuke*; Honda, Teruyuki*; Iwatsuki, Teruki; Nomura, Masao*

no journal, , 

The occurrence of rare earth elements in alteration rock and fault of Toki granite was observed to infer the migration process of minor actinides. The light rare earth elements concentrated in alteration rock and fault compared to fresh rock due to precipitation as a secondary mineral and adsorption onto clay minerals. This suggests the possibility of retardation of minor actinides by alteration minerals.

Oral presentation

Natural analogue study on colloidal migration of trace elements

Iwatsuki, Teruki; Munemoto, Takashi; Omori, Kazuaki; Ishiwata, Kentaro*; Honda, Teruyuki*

no journal, , 

Natural analogue study on colloidal radionuclide migration was carried out by using rare earth elements (REE) in deep granitic groundwater. The analysis of REE on colloid and the chemical property indicates that the mobility of REE is affected by carbonates-colloid. While the clay-colloid and organic-colloid has less influence for REE mobility.

Oral presentation

Natural analogue study for migration behavior of trace elements at fault part of the Wakkanai formation, northern Hokkaido

Nakabayashi, Kazuya*; Honda, Teruyuki*; Mizuno, Takashi; Nomura, Masao*

no journal, , 

no abstracts in English

17 (Records 1-17 displayed on this page)
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