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Mantle contamination under Akagi Volcano, Japan, as inferred from combined Sr‐O isotope relationships
Author(s) -
Notsu Kenji,
Kita Itsuro,
Yamaguchi Takashi
Publication year - 1985
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl012i006p00365
Subject(s) - geology , volcano , subduction , mantle (geology) , mantle wedge , volcanic arc , eurasian plate , pacific plate , seismology , slab , plate tectonics , island arc , geochemistry , tectonics , paleontology
The Northeast Japan arc is associated with westward subduction of the Pacific plate beneath the Eurasian plate. At the southernmost region of the arc, the Philippine Sea plate subducts northward into the mantle wedge between the Eurasian plate and the Pacific slab. Akagi volcano located at this region yields volcanic rocks with combined Sr‐O isotope relationships which are explained in terms of the mixing of the mantle material from the mantle wedge and deep ocean and/or continent derived sediments conveyed with the subducting Philippine Sea plate. This implys that the Philippine Sea plate continues to the location just under Akagi volcano, although the seismic Philippine Sea plate does not reach just under the volcano.