High-pressure partial melting of garnet pyroxenite: possible mafic lithologies in the source of ocean island basalts

Many ocean island basalts (OIB) that have isotopic ratios indicative of recycled crustal components in their source are silica-undersaturated and unlike silicic liquids produced from partial melting of recycled mid-ocean ridge basalt (MORB). However, experiments on a silica-deficient garnet pyroxeni...

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Bibliographic Details
Published in:Earth and planetary science letters 2003-12, Vol.216 (4), p.603-617
Main Authors: Kogiso, T, Hirschmann, M M, Frost, D J
Format: Article
Language:English
Subjects:
Marine
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Summary:Many ocean island basalts (OIB) that have isotopic ratios indicative of recycled crustal components in their source are silica-undersaturated and unlike silicic liquids produced from partial melting of recycled mid-ocean ridge basalt (MORB). However, experiments on a silica-deficient garnet pyroxenite, MIX1G, at 2.0-2.5 GPa show that some pyroxenite partial melts are strongly silica- undersaturated [M.M. Hirschmann et al. Geology 31 (2003) 481-484]. These low- pressure liquids are plausible parents of alkalic OIB, except that they are too aluminous. We present new partial melting experiments on MIX1G between 3.0 and 7.5 GPa. Partial melts at 5.0 GPa have low SiO sub(2) (
ISSN:0012-821X
DOI:10.1016/S0012-821X(03)00538-7