The Petrology and Geochemistry of High-Magnesium Andesites at the Western Tip of the Setouchi Volcanic Belt, SW Japan |
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| Authors: | TATSUMI, Y. SHUKUNO, H. SATO, K. SHIBATA, T. YOSHIKAWA, M. |
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| Affiliation: | 1 INSTITUTE FOR FRONTIER RESEARCH ON EARTH EVOLUTION (IFREE), JAPAN MARINE SCIENCE AND TECHNOLOGY CENTER (JAMSTEC), YOKOSUKA 237-0061, JAPAN
2 INSTITUTE FOR GEOTHERMAL SCIENCES, KYOTO UNIVERSITY, BEPPU 874-0907, JAPAN |
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| Abstract: | KAr ages, and petrographical and geochemical characteristicsof high-magnesium andesites and plagioclase-phyric andesitesfrom the NE Kyushu region, Japan, are presented. KArages range from 10·7 ± 0·3 to 14·4± 0·4 Ma, overlapping those reported for lavasof the Setouchi Volcanic Belt in other regions (1116Ma). This, together with major and incompatible trace element,and SrNdPb isotopic characteristics, confirmsthat the Setouchi Volcanic Belt, which is characterized by theoccurrence of high-magnesium andesites, extends for |
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