Journal of Mineralogical and Petrological Sciences
Online ISSN : 1349-3825
Print ISSN : 1345-6296
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Genetic relationship between post-caldera and caldera-forming magmas from Aso volcano, SW Japan: Constraints from Sr isotope and trace element compositions
Masaya MIYOSHITomoyuki SHIBATAMasako YOSHIKAWATakashi SANOTaro SHINMURAToshiaki HASENAKA
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2011 Volume 106 Issue 2 Pages 114-119

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Abstract

We analyzed the Sr isotope and trace element compositions of the post-caldera volcanic products of Aso volcano in central Kyushu, with the aim of investigating the genetic relationship between the last caldera-forming (Aso-4) magmas and post-caldera magmas. The 87Sr/86Sr ratio of the magmas drastically changed from the homogeneous (0.7041-0.7042) caldera-forming stage to the heterogeneous (0.7040-0.7044) post-caldera stage. In addition, the obtained geochemical data suggested that the Aso-4 magma did not contribute to the origin and compositional evolution of the post-caldera magmas. These observations indicated that the generation of post-caldera magmas was probably independent of the Aso-4 magma.

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© 2011 Japan Association of Mineralogical Sciences
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