Abstract
The Nb/Y-Zr/Y plot implies that, before mantle metasomatism, magma sources for NE Japan arc basalts were more depleted in incompatible elements as a result of previous extraction of magmas than those for the N-type mid-oceanic ridge basalts. The LILE/Y-Zr/Y plots imply that the NE Japan arc basalts are derivatives from mantle regions metasomatically enriched in LILE probably by fluids released from the subduction zone. The degree of alkali (Rb and K) enrichment is lower in the trench side than in the back-arc side, but that of Sr enrichment is higher in the trench side. The alkalic volcanism in the back-arc region, with the exception of that belonging to the Chokai volcanic zone, is affected by mantle metasomatism to limited extents.
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Schedule a callMore From: The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists
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