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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.

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