Temporal variation in primary magma compositions in the northeast Japan Arc

Shigeru Yamashita, Yoshiyuki Tatsumi, Susumu Nohda

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A remarkable temporal variation in primary magma compositions has been found in the Northeast Japan arc. The trench-side magmas have become more enriched in FeO* and the backarc-side magmas have become more depleted in FeO* while retaining almost constant SiO2 levels for the last ∼20 million years. In order to understand the origin of the temporal variation, FeO* and SiO2 contents in partial melts are modeled for an adiabatically-rising mantle as a function of potential temperature and original composition of the mantle material. The result demonstrates that the primary magmas that are more depleted in FeO* were derived from the mantle materials either at lower potential temperatures or with compositions more depleted in basaltic components. A possible mechanism for the inferred primary magma variability is the change in depth intervals with time of magma production in a compositionally-layered mantle wedge; greater degrees of depletion at a greater depth is reconciled with a probable thermal regime in the mantle wedge.

Original languageEnglish
Pages (from-to)276-288
Number of pages13
JournalIsland Arc
Volume5
Issue number3
DOIs
Publication statusPublished - 1996

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temporal variation
magma
mantle
potential temperature
thermal regime
trench
melt
material

Keywords

  • Northeast Japan arc
  • Primary magma
  • Temporal variation

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Temporal variation in primary magma compositions in the northeast Japan Arc. / Yamashita, Shigeru; Tatsumi, Yoshiyuki; Nohda, Susumu.

In: Island Arc, Vol. 5, No. 3, 1996, p. 276-288.

Research output: Contribution to journalArticle

Yamashita, Shigeru ; Tatsumi, Yoshiyuki ; Nohda, Susumu. / Temporal variation in primary magma compositions in the northeast Japan Arc. In: Island Arc. 1996 ; Vol. 5, No. 3. pp. 276-288.
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