Development of Compositionally-zoned Epidote from the Yaguki Skarn Deposit, Northeastern Japan
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概要
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The compositional distribution of elements in an epidote from the epidote skarn in the Yaguki tungstencopper mine, northeastern Japan shows an increase in Al and Ca contents with a concurrent decrease of Fe and Mn contents from the core to the margin, which is clearly visualized by colored mapping.<BR>The compositional pattern and quantitative analytical data of the zoned epidote demonstrate that the Fe<SUP> 3+</SUP>/(Fe<SUP> 3+</SUP>+Al) ratio in the octahedral site changes continuously in a wide range from 0.28 down to 0.02 and the manganese substitution for calcium in the A site up to 6 percent. Such mineral chemistry of the epidote can be attributed to lowering in the temperature and/or a decrease in the ratio of FeCl<SUB>3</SUB>/(FeCl<SUB>3</SUB>+AlCl<SUB>3</SUB>) in the coexisting fluid.
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資源地質学会 | 論文
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