Computer Science
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982e%26psl..60..293t&link_type=abstract
Earth and Planetary Science Letters, Volume 60, Issue 2, p. 293-304.
Computer Science
58
Scientific paper
High-magnesian andesites of middle Miocene age occur in southwest Japan, forming an obvious volcanic belt. These andesites have low FeO*/MgO ratios (0.546-0.931), and are rich in Ni (101-312 ppm), Co (30.0-45.1 ppm), and Cr (208-756 ppm). They are relatively aphyric (phenocrysts <10 vol.%), and the phenocrysts of magnesian olivine (~Fo88) are in equilibrium with the host high-magnesian andesite magmas on the basis of the Fe-Mg exchange partitioning. These features suggest that the high-magnesian andesites are not differentiated or accumulative; they appear to represent primary andesites generated in the upper mantle. These southwest Japanese high-magnesian andesites are rich in incompatible elements, and show light rare earth enrichment relative to boninites, suggesting that the former is derived from a less depleted mantle source than the latter.
Ishizaka Kyoichi
Tatsumi Yoshiyuki
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