New seismic evidence for the origin of arc and back-arc magmas

Dapeng Zhao, Sadato Ueki, Yukihisa Nishizono, Akira Yamada

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

We used high-resolution seismic tomography to probe into the arc and back-arc magmatism and volcanism of the Japan subduction zone. Prominent zones with low-velocity, high Poisson's ratio, high-attenuation and strong seismic anisotropy are revealed in the crust and uppermost mantle beneath the active volcanoes, and they exist in the central portion of the mantle wedge under the volcanic front and back-arc region, roughly parallel with the subducting oceanic plate. The anomalous zones in the mantle wedge are connected with the subducting slab at a depth of 90-150 km, while they also exhibit along-arc variations. These seismological results indicate that the arc and back-arc magmas are caused by a combination of corner flow (convection) in the mantle wedge and fluids resulting from the dehydration process of the subducting oceanic plate.

Original languageEnglish
Title of host publicationTopics in Igneous Petrology
PublisherSpringer Netherlands
Pages117-132
Number of pages16
ISBN (Print)9789048195992
DOIs
Publication statusPublished - 2011 Dec 1

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

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    Zhao, D., Ueki, S., Nishizono, Y., & Yamada, A. (2011). New seismic evidence for the origin of arc and back-arc magmas. In Topics in Igneous Petrology (pp. 117-132). Springer Netherlands. https://doi.org/10.1007/978-90-481-9600-5_6