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

现将本研究的重要结果总结如下：(1)热液蚀变岩（黑子矿床）分析研究阐明了热液蚀变过程中稀土元素的地球化学行为。(2)对污染土壤、河流沉积物和沙粒的贱金属（如铬等）和稀土元素进行分析研究，对萃取物和水岩相互作用进行实验研究，明确了贱金属和稀土元素的浓度和化学状态。(3)基于分析、热化学数据和水岩相互作用实验对地下水化学进行了解释。计算机模拟也用于其解释。通过水岩相互作用实验和模拟，对地下CO_2固存、含水层CO_2容量和地下CO_2行为进行了估算和澄清。(4)分析了沉积岩中的次生矿物（粘土矿物和碳酸盐）中贱金属和稀土元素，并考虑了控制这些元素浓度的因素（离子半径、电荷、电负性等）。研究了核废料中放射性元素释放的迟滞问题。研究了防止污染土壤中贱金属元素释放的方法。(5)利用动力学-流体耦合模型模拟了富士山地区地下水地球化学特征，估算了地下水停留时间。

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.