Thermal and geochemical evolution of the mantle wedge in the northeast Japan Arc 1. Contribution from experimental petrology

Y. Tatsumi, Y. Furukawa, S. Yamashita

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Melting phase relations at high pressures have been examined for four Mg-rich basalts from both the trench and the backarc sides of the Miocene NE Japan arc. All these basalts crystallize olivine and orthopyroxene on the liquidus at pressures lower and higher than the point of multiple saturation with those two phases, respectively. The pressure of multiple saturation is constant for all samples suggesting that: 1) there was no across-arc variation in the depth of magma segregation in the Miocene NE Japan arc, 2) the depth of magma segregation remains constant since 20 Ma in the trench side of the volcanic arc, whereas it has changed from 30-40 km to >60 km beneath the backarc side of the arc. This temporal variation may be caused by increasing thickness of the lithosphere beneath the backarc region. -from Authors

Original languageEnglish
Pages (from-to)22,275-22,283
JournalJournal of Geophysical Research
Volume99
Issue numberB11
DOIs
Publication statusPublished - 1994
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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