Investigation of Mass Transfer Mechanism Associated with Water-Rock Reaction and Its Application to Resources and Environmental mental Problems

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Important results obtained by this study are summarized as follows.(1) Analytical study on hydrothermally altered rocks associated with hydrothermal are deposits ( kuroko deposits) clarified geochemical behavior of rare earth elements during the hydrothermal alteration.(2) Analytical study on base metals (i. e. Cr etc) and rare earth elements contaminated soils, river sediments and sands and experimental study on the extraction and water-rocks interaction clarified the concentrations and chemical states of base metal and rare earth elements.(3) Groundwater chemistry was interpreted based on analytical and thermo chemical data and water-rock interaction experiments. Computer simulation was also used for its interpretation. Water-rock interaction experiments and simulations were also applied to CO_2 underground sequestration and CO_2 capacity in aquifer and CO_2 behavior in underground were estimated and clarified.(4) Secondary minerals( clay minerals and carbonates) in sedimentary rocks were analyzed for base metals and rare earth elements and the factors controlling the concentrations of these elements ( ionic radii, charge, electronegativity etc) were considered. The retardation of radioactive elements released from nuclear waste was considered. The method preventing the release of base metal elements from contaminated soils was considered.(5) The simulation based on kinetics-fluid flow coupling model was carried out to interpret groundwater geochemistry and estimate residence time of groundwater in Mt. Fuji area.