Melting of a subducting slab and production of high-Mg andesite magmas: Unusual magmatism in SW Japan at 13~15Ma

Details Melting of a subducting slab and production of high-Mg andesite magmas: Unusual magmatism in SW Japan at 13~15Ma Melting of a subducting slab and production of high-Mg andesite magmas: Unusual magmatism in SW Japan at 13~15Ma

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2271f&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 15, p. 2271-2274

Physics

12

Tectonophysics, Tectonophysics: Dynamics Of Lithosphere And Mantle-General, Tectonophysics: Evolution Of The Earth, Tectonophysics: Plate Boundary-General

Scientific paper

Characteristic high-Mg andesite magmas were produced in the SW Japan arc at 13~15Ma that was synchronous with the commencement of subduction of a very young (<11 m.y.) lithosphere of the Shikoku Basin. Numerical simulation suggests that temperature at the surface of such a young subducting plate is high enough for partial melting both of the subducting sediments and oceanic crust at the beginning of the subduction. High-Mg andesite magmas were likely to be produced by interaction between silicic slab melts and the overlying mantle wedge. HMA magmas may be commonly produced in the Archean subduction zones under relatively high mantle temperature conditions, contributing to making continental crusts.

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