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  1. 防災科研関係論文

A trachyte–syenite core within a basaltic nest: filtering of primitive injections by a multi-stage magma plumbing system (Oki-Dōzen, south-west Japan)

https://nied-repo.bosai.go.jp/records/4148
https://nied-repo.bosai.go.jp/records/4148
0b14d186-daf3-4406-b564-56f5517158f1
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル A trachyte–syenite core within a basaltic nest: filtering of primitive injections by a multi-stage magma plumbing system (Oki-Dōzen, south-west Japan)
著者 Marco Brenna

× Marco Brenna

en Marco Brenna

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Setsuya Nakada

× Setsuya Nakada

en Setsuya Nakada

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Daisuke Miura

× Daisuke Miura

en Daisuke Miura

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Kiyoshi Toshida

× Kiyoshi Toshida

en Kiyoshi Toshida

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Hisatoshi Ito

× Hisatoshi Ito

en Hisatoshi Ito

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Natsumi Hokanishi

× Natsumi Hokanishi

en Natsumi Hokanishi

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Shun’ichi Nakai

× Shun’ichi Nakai

en Shun’ichi Nakai

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抄録
内容記述タイプ Other
内容記述 © 2015, Springer-Verlag Berlin Heidelberg. Oki-Dōzen (Japan) is a Late Miocene (7–5 Ma) intraplate alkalic volcano composed of a central trachytic pyroclastic complex surrounded by a ring-shaped succession of basaltic to trachybasaltic lavas and pyroclastic rocks and dispersed trachytic bodies. The central trachytic complex is in contact with a syenite that was intruded into the basement early Miocene volcano-sedimentary succession. In the centre of the system there are no alkalic basaltic rocks that are correlative of the outer flank ring. We present whole-rock major and trace element chemistry, Sr–Nd–Pb isotopic compositions and petrological data from the central trachytic volcanic complex and the intrusive syenite body, as well as from the outer ring basaltic succession. We also present and discuss a new set of zircon U/Pb ages collected from the central trachyte and syenite bodies. All the eruptive products of Oki-Dōzen, as well as the syenite, plot on a single liquid line of descent initiated from a mantle-derived alkalic basaltic parent. A younger (2.8 Ma) basaltic eruption (Uzuka basalt) has isotopic compositions that distinguish it from the rest of the system. Geochemical modelling indicates that magmatic differentiation through crystal fractionation and minor crustal assimilation occurred in crustal and shallow sub-volcanic magma reservoirs. In the central part of the system, a number of vertically spaced reservoirs acted as a filter, capturing basaltic dykes and hindering their ascent. In the outer region, dykes either reached the surface unhindered and erupted to form the basaltic/trachybasaltic succession or stalled at crustal levels and differentiated to trachyte before forming dispersed domes/flows. The central plumbing system “filter” resulted in a nest-shaped volcano, with a trachytic core surrounded by basaltic products, and stopped direct injection of basaltic magmas into the shallow syenitic magma reservoir, likely preventing its destabilization and explosive eruption.
言語 en
書誌情報 en : Contributions to Mineralogy and Petrology

巻 170, 号 2
ISSN
収録物識別子タイプ ISSN
収録物識別子 0010-7999
DOI
関連識別子 10.1007/s00410-015-1181-0
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