地表条件下における長石類の人工変質 : 酸性雨の岩石鉱物に与える影響の研究(その1)

概要

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Three natural feldspars - albite, anorthite and microcline - are artificially weathered for 360 days using a Soxhlet extraction apparatus with distilled water and 0.1N HCl solution. Testing results : 1) At the early stage of weathering, feldspars started to dissolve along thier cleavage while small etch pits appeared on flat cleavage surface. As weathering continues, a new products - boehmite - was formed on the feldspar surface. The reaction rate of anorthite was larger than the other feldspars, which was promoted by HCl solution. 2) Boehmite was formed on all feldspars. However, in the case of anorthite, gibbsite and nordstrandite were formed additionally 3) Kaoline minerals, the most populous clay minerals in naturally weathered feldepers, were not recognized in the present experiment. No kaoline minerals were produced due to the circulatation of the solution which was faster than in natural condition. Early results suggest possible apprication for interpreting environmental influences of acid-rain.
日本粘土学会の論文
1992-07-25