The influence of subduction processes on the geochemistry of Japanese alkaline basalts

Eizou Nakamura, Ian H. Campbell, Shen Su Sun

Research output: Contribution to journalArticle

82 Citations (Scopus)

Abstract

The composition of volcanic rocks erupted in complex plate tectonic settings can provide information on the nature of the underlying mantle. We show here that the geochemistry of alkali basalts from Japan and eastern Asia varies systematically with distance from the Japanese island-arc. Samples from northeastern Japan, relatively close to the Japan Trench, are enriched in K, Sr, Ba and Rb and depleted in Ta, Nb and Ti as compared with samples from southwestern Japan. Both sets show an island-arc influence on their composition, but alkali basalts from still further west (Korea and northeastern China) have chemistries which are indistinguishable from ocean island basalts. We suggest that the northeastern island-arc type of alkali basalts were derived from a 'normal' upper mantle source altered by fluids or melts released from the underlying subducted Pacific plate. The extent of this island-arc-related alteration decreases with distance from the trench.

Original languageEnglish
Pages (from-to)55-58
Number of pages4
JournalNature
Volume316
Issue number6023
DOIs
Publication statusPublished - 1985
Externally publishedYes

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island arc
alkali basalt
subduction
basalt
geochemistry
trench
ocean island basalt
Pacific plate
plate tectonics
mantle source
tectonic setting
upper mantle
volcanic rock
melt
mantle
fluid

ASJC Scopus subject areas

  • General

Cite this

The influence of subduction processes on the geochemistry of Japanese alkaline basalts. / Nakamura, Eizou; Campbell, Ian H.; Sun, Shen Su.

In: Nature, Vol. 316, No. 6023, 1985, p. 55-58.

Research output: Contribution to journalArticle

Nakamura, Eizou ; Campbell, Ian H. ; Sun, Shen Su. / The influence of subduction processes on the geochemistry of Japanese alkaline basalts. In: Nature. 1985 ; Vol. 316, No. 6023. pp. 55-58.
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