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1963•The Journal of the Japanese Association of Mineralogists Petrologists and Economic GeologistsOpen access

Chemical compositions of the Tertiary volcanic rocks of Ryozen and its environs

Ryuichi Yashima

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Abstract

Abstract: The basalts and andesites of the Ryozen formation (Miocene in age) of the northern Abukuma region, northeastern Japan are chemically analyzed. The aphyric basalts of the lower and upper parts of the formation are characterized by high Al2O3 content and their mineralogy and chemistry agree with that of the Kuno's high alumna basalt (Kuno, 1960). On the other hand, the olivine basalts of the middle part are relatively rich in MgO and poor in alkalies and TiO2, thus bear the character of the tholeiitic basalts.

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Abstract: The basalts and andesites of the Ryozen formation (Miocene in age) of the northern Abukuma region, northeastern Japan are chemically analyzed. The aphyric basalts of the lower and upper parts of the formation are characterized by high Al2O3 content and their mineralogy and chemistry agree with that of the Kuno's high alumna basalt (Kuno, 1960). On the other hand, the olivine basalts of the middle part are relatively rich in MgO and poor in alkalies and TiO2, thus bear the character of the tholeiitic basalts.

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Available abstract

Abstract: The basalts and andesites of the Ryozen formation (Miocene in age) of the northern Abukuma region, northeastern Japan are chemically analyzed. The aphyric basalts of the lower and upper parts of the formation are characterized by high Al2O3 content and their mineralogy and chemistry agree with that of the Kuno's high alumna basalt (Kuno, 1960). On the other hand, the olivine basalts of the middle part are relatively rich in MgO and poor in alkalies and TiO2, thus bear the character of the tholeiitic basalts.

Key concepts: Andesites, Basalt, Geochemistry, Olivine, Geology, Volcanic rock, Volcano, Andesite

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