ARTIFICIAL WEATHERING OF GRANITE UNDER EARTH SURFACE CONDITIONS : THE INFLUENCE OF ACID RAIN ON ROCKS AND MINERALS (PART 3)

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概要

• 論文の詳細を見る

• In order to predict the effect of acid precipitation on building stone, artificial chemical weathering of polished plates of Kitagi Granite, Okayama, southwestern Japan, was conducted. An improved Soxhlet extraction apparatus was used with distilled water and HNO_3, H_2SO_4 and HCl solutions of pH 3 at 55℃ for different periods of time up to 824 days. The granite was composed mainly of quartz, plagioclase (Ab_<86>An_<12>Or_2), alkali feldspar (Or_<92>Ab_8) and biotite. The leached sample solutions were analyzed for major and minor elements using ICP, ICP-MS and ionchromatography. Morphological and chemical changes of each mineral surface were studied by SEM, EPMA and micrroscopic tehniques. Alteration products were collected from the surface of each mineral on the polished plates by hand picking and examined using XRD. Molar ratios of each element in the leached solutions to those in the fresh granite varied depending on the experimental period. The retios of elements such as Mn, Fe, Mg, Sc and Zn, which reflect the diossolution of bitite, were relatively high. Similarly, the ratios of Ca, Na, Gd, Sm, Nd, La and Sr, which reflect the dissolution of plagioclase, were relatively high. It seems, therefore, that plagioclase and biotite are easily weathered. It was also estimated from the ratios that the reactivity order of the acid solutions for plagioclase is H_2SO_4 HCl ard HNO_3, and for biotite is HNO_3, H_2SO_4, and HCl. It is evident that biotite changed into mica-clay minerals and/or interstratified minerals of mica and vermiculite by exposure to the various acid solutions used in the experiment. Smectite appeared to be formed from plagioclase during the artificial chemical weathering. However, altered products from quartz and alkali feldspar, were not detected.

• 日本粘土学会の論文

著者

• KOBAYASHI Shoichi

  Division of Earth Sciences, Kurashiki University of Science and the Arts

• Kobayashi Shoichi

  Division Of Clinical Laboratory Kanagawa Cancer Center

• Kobayashi Shoichi

  Division Of Earth Sciences Kurashiki University Of Science And The Arts

• SAKAMOTO TAKABUMI

  Department of Applied Science, Faculty of Science, Okayama University of Science

• Sakamoto T

  Chiba Inst. Sci. Chiba Jpn

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• ARTIFICIAL WEATHERING OF GRANITE UNDER EARTH SURFACE CONDITIONS : THE INFLUENCE OF ACID RAIN ON ROCKS AND MINERALS (PART 3)
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