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  1. 防災科研関係論文

Remobilization of highly crystalline felsic magma by injection of mafic magma: Constraints from the middle sixth century eruption at Haruna volcano, Honshu, Japan

https://nied-repo.bosai.go.jp/records/4697
https://nied-repo.bosai.go.jp/records/4697
6b46bcc2-749b-4308-a7e8-197cf40a1f9d
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Remobilization of highly crystalline felsic magma by injection of mafic magma: Constraints from the middle sixth century eruption at Haruna volcano, Honshu, Japan
著者 Yuki Suzuki

× Yuki Suzuki

en Yuki Suzuki

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Setsuya Nakada

× Setsuya Nakada

en Setsuya Nakada

Search repository
抄録
内容記述タイプ Other
内容記述 The latest eruption of Haruna volcano at Futatsudake took place in the middle of the sixth century, starting with a Plinian fall, followed by pyroclastic flows, and ending with lava dome formation. Gray pumices found in the first Plinian phase (lower fall) and the dome lavas are the products of mixing between felsic (andesitic) magma having 50 vol. % phenocrysts and mafic magma. The mafic magma was aphyric in the initial phase, whereas it was relatively phyric during the final phase. The aphyric magma is chemically equivalent to the melt part of the phyric mafic magma and probably resulted from the separation of phenocrysts at their storage depth of ?15 km. The major part of the felsic magma erupted as white pumice, without mixing and heating prior to the eruption, after the mixed magma (gray pumice) and heated felsic magma (white pumice) of the lower fall deposit. Although the mafic magma was injected into the felsic magma reservoir (at ?7 km depth), part of the product (lower fall ejecta) preceded eruption of the felsic reservoir magma, as a consequence of upward dragging by the convecting reservoir of felsic magma. The mafic magma injection made the nearly rigid felsic magma erupt, letting low-viscosity mixed and heated magmas open the conduit and vent. Indeed the lower fall white pumices preserve a record of syneruptive slow ascent of magma to 2 km depth, probably associated with conduit formation. c The Author 2007. Published by Oxford University Press. All rights reserved.
言語 en
書誌情報 en : Journal of Petrology

巻 48, 号 8, p. 1543-1567, 発行日 2007-08
ISSN
収録物識別子タイプ EISSN
収録物識別子 1460-2415
DOI
関連識別子 10.1093/petrology/egm029
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