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Report No.

Investigations of mineral alteration in Kunigel V1 samples contacted with iron obtained from long-term in-situ experiments

Ishidera, Takamitsu ; Sasamoto, Hiroshi   ; Sato, Hisao*

Compacted bentonite (Kunigel V1) retrieved from the in-situ experiments in the ABM project was investigated to identify the mineralogical alteration of montmorillonite by iron-bentonite interaction in compacted bentonite. Berthierine, Fe-saponite and Fe-chlorite were found as the most possible alteration minerals of montmorillonite. Gypsum and calcite were identified at the contact surface between iron heater and compacted bentonite. These minerals were considered to be formed by the concentrating of salinity in the pore water of compacted bentonite due to the temperature gradient from iron heater.



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