Abstract
The Aoso volcano is a member of the newly defined volcanic front of Northeast Japan, characterized by the occurrence of low-K and hornblende andesites. Its activity can be divided into three stages: the early, caldera-forming, and late stages. While petrographic and geochemical data show all products underwent magma mixing or co-mingling, Sr and Nd isotopic ratios indicate that all are consanguineous. The end-member magmas are basaltic and andesitic in the early stage, but basaltic and dacitic in the late stage. In the caldera-forming stage, hornblende-free and hornblende-rich andesites co-mingled, which triggered an explosive eruption leading to caldera formation. Hornblende occurs also in the dacite from the early part of the late stage. These hornblende andesites and dacites are lower in magmatic temperature compared to hornblende-free andesites. The estimated basaltic end-member is low-K and high in magmatic temperature, and can be derived by a high degree of partial melting of mantle under the volcanic front. The estimated andesitic and dacitic end-members cannot be derived from the basaltic end-member magma through fractional crystallization, but can be derived from partial re-melting of the solidified low-K basalt, leaving amphibolitic and gabbroic residues, respectively.
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Acknowledgments
We are grateful to R.W. Jordan of Yamagata University for correcting the English in this paper. Many constructive comments and suggestions from anonymous reviewers and the editor T.L. Grove greatly helped to revise the manuscript. We also express our thanks to S. Kanisawa, H. Tanaka and K. Saito of Yamagata University for their continual support of this research. The constructive comments from T. Yoshida and M. Nakamura of Tohoku University, Y. Tatsumi and Y. Tamura of IFREE were helpful to complete this manuscript. We are grateful to S. Ohde of Ryukyus University for facility of isotope analyses. Parts of this study were supported by the Grants-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology, Japan (No. 13640483 to R. Shinjo).
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Toya, N., Ban, M. & Shinjo, R. Petrology of Aoso volcano, northeast Japan arc: temporal variation of the magma feeding system and nature of low-K amphibole andesite in the Aoso-Osore volcanic zone. Contrib Mineral Petrol 148, 566–581 (2005). https://doi.org/10.1007/s00410-004-0621-z
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DOI: https://doi.org/10.1007/s00410-004-0621-z