Physics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.2719h&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 14, p. 2719-2722
Physics
4
Geochemistry, Tectonophysics: Stresses-Crust And Lithosphere, Volcanology: Eruption Mechanisms, Information Related To Geographic Region: Pacific Ocean
Scientific paper
Alkali pillow basalts were collected from the toe of the oceanward slope of the northern Japan Trench. These alkali-basalts formed as a result of a low degree of partial melting of Pacific Ocean mantle and rapid rise of the magma (no fractionation in shallow magma chambers). Reconstructing Pacific Plate motion based on 40Ar-39Ar age dates of 5.95+/-0.31Ma for these basalts indicates that they erupted outboard of outer swell or forebulge of the Japan Trench in the NW Pacific. We suggest that these alkali-basalts represent a new form of intra-plate volcanism, whereby magmatic activity occurs off the forebulge of the downgoing Pacific slab, perhaps using conduits related to fracturing of the slab during bending prior to subduction.
Hattori Makoto
Hirano Naomi
Kawamura Katsunori
Ogawa Yasumasa
Saito Katsuhiko
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