Computer Science
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006e%26psl.249..229h&link_type=abstract
Earth and Planetary Science Letters, Volume 249, Issue 3-4, p. 229-240.
Computer Science
Scientific paper
New Sr, Nd, and Pb isotopic data for Cenozoic basalts from northwest Kyushu, Japan and the Okinawa Trough, suggest that mantle sources feeding the Ryukyu ‘back-arc’ side volcanoes, represent a mixture of Pacific N-MORB mantle with EM2-rich components, with little or no EM1. The compositions of these basalts differ fundamentally from those characterizing northern Kyushu and the Japan Sea, which tap DUPAL-like (i.e. EM1-rich) sources similar to those prevailing beneath east and southeast Asia and western Pacific marginal basins. The apparent decrease in mantle DUPAL-like character to the east of northern Kyushu and the Sea of Japan, and its relative insignificance in mantle beneath the Ryukyu ‘back-arc’ region, suggest that Pacific MORB mantle may have been trapped within the mantle wedge during Philippine Sea plate subduction, thereby confining sub-Eurasian DUPAL-type asthenosphere to the west and restricting its flow to the east.
Hoang Nguyen
Uto Kozo
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