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  1. 防災科研関係論文

Petit-spot geology reveals melts in upper-most asthenosphere dragged by lithosphere

https://nied-repo.bosai.go.jp/records/4270
https://nied-repo.bosai.go.jp/records/4270
a371c3ea-3978-425b-be25-919655521a53
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Petit-spot geology reveals melts in upper-most asthenosphere dragged by lithosphere
言語
言語 eng
著者 Shiki Machida

× Shiki Machida

en Shiki Machida

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Naoto Hirano

× Naoto Hirano

en Naoto Hirano

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Hirochika Sumino

× Hirochika Sumino

en Hirochika Sumino

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Takafumi Hirata

× Takafumi Hirata

en Takafumi Hirata

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Shigekazu Yoneda

× Shigekazu Yoneda

en Shigekazu Yoneda

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Yasuhiro Kato

× Yasuhiro Kato

en Yasuhiro Kato

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抄録
内容記述タイプ Other
内容記述 Petit-spot volcanism is a phenomenon ubiquitous on Earth. It originates from melt in the uppermost mantle asthenosphere, occurring where the plate flexes and fractures before subduction. Recent geochemical and petrological studies of petit-spot volcanism lava have shown that understanding this form of volcanism can contribute to the investigation of mantle dynamics and CO2 degassing of Earth. However, geological information constraining the magma source of petit-spot remains limited. Here, we present a comprehensive dataset of geochemistry (major and trace elements, and Sr and Nd isotopic compositions) and Ar-40/Ar-39 ages of alkaline basaltic rocks and glasses to define the geological characteristics of petit-spot volcanoes in the northwestern Pacific. The geochemical and geochronological variations of the basalts indicate that petit-spot volcanism is characterized by a petrogenetically and temporally isolated magma system for each volcano. The basalt geochemistry further indicates that the magmas at the volcanoes were derived from the melting of a heterogeneous regional-scale source under a range of conditions. In addition, slight temporal intra-field migration of petit-spot vent fields against the plate motion was detected. These features indicate that the magma originates from isolated melt ponds at the lithosphere-asthenosphere boundary, and that the speed at which the melt ponds are dragged by the plate is only slightly slower than that of the plate motion. Our results provide detailed insight into eruption processes of asthenosphere melts induced by plate-flexure, and also suggest the complete coupling of the lithosphere to the upper-most asthenosphere in the case of large plate subduction. (C) 2015 Elsevier B.V. All rights reserved.
言語 en
書誌情報 en : EARTH AND PLANETARY SCIENCE LETTERS

巻 426, p. 267-279
出版者
言語 en
出版者 ELSEVIER SCIENCE BV
ISSN
収録物識別子タイプ EISSN
収録物識別子 1385-013X
DOI
関連識別子 10.1016/j.epsl.2015.06.018
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