Continental crust, crustal underplating, and low-Q upper mantle beneath an oceanic island arc

Kiyoshi Suyehiro, Narumi Takahashi, Yoshiro Ariie, Yasutaka Yokoi, Ryota Hino, Masanao Shinohara, Toshihiko Kanazawa, Naoshi Hirata, Hidekazu Tokuyama, Asahiko Taira

Research output: Contribution to journalArticlepeer-review

257 Citations (Scopus)

Abstract

A detailed structural model of the crust, subducting slab, and underlying upper mantle across the northern Izu-Ogasawara (Bonin) island arc system is derived from a marine seismic reflection and ocean bottom seismographic refraction survey and subsequent forward modeling combined with tomographic inversion. The model indicates that the crust is thickest beneath the presently active rift zone and a granitic crust may have formed in the mid-crust. A highly attenuative mantle (that is, one with low quality Q) seems to be confined mainly beneath the presently active rift zone. In contrast, high P-wave velocity persists in the lower crust between the forearc and eastern margin of the back arc basin, suggesting a large-scale magma input responsible for the arc formation.

Original languageEnglish
Pages (from-to)390-392
Number of pages3
JournalScience
Volume272
Issue number5260
DOIs
Publication statusPublished - 1996 Apr 19

ASJC Scopus subject areas

  • General

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