DISTRIBUTION OF COPPER AND ZINC IN VOLCANIC ASHES
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概要
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The distribution of copper and zinc in volcanic ashes was investigated. It was found that the total copper of volcanic ashes decreased with the increase of their total silica, showing a close relationship between the total copper and the rock types of volcanic ashes. On the other hand, the total zinc showed no such correlation with the rock types. The contents of copper and zinc in the constituent minerals indicated that zinc was more concentrated in the heavy minerals and was closely related to the iron contents of the constituent minerals. According to the concentrations of copper and zinc in the constituent minerals and the total contents of the minerals in the andesitic ash samples, the distribution of these elements was determined to be the following order. Cu : volcanic glass>plagioclase>pyroxenes>titanomagnetite Zn : pyroxenes>volcanic glass>titanomagnetite > plagioclase Since volcanic ashes belonging to rhyolite and basalt were overwhelmingly composed of volcanic glass, it was obvious that the distribution of copper and zinc was much greater in the volcanic glass of these ashes.
- 社団法人日本土壌肥料学会の論文
著者
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Kobayashi Shinsuke
Faculty Of Agriculture Tohoku University
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Shoji Sadao
Faculty Of Agriculture Tohoku University
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