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Melting relations of basalt-andesile-rhyolite-H_2O and a pelagic red clay at 30 kb

Stern, C. R. and Wyllie, P. J. (1973) Melting relations of basalt-andesile-rhyolite-H_2O and a pelagic red clay at 30 kb. Contributions to Mineralogy and Petrology, 42 (4). pp. 313-323. ISSN 0010-7999. doi:10.1007/BF00372609.

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An olivine basalt, a tonalite (andesite), a granite (rhyolite), and a red clay (pelagic sediment) were reacted, with known quantities of water in sealed noble metal capsules, in a piston-cylinder apparatus at 30 kb pressure. For the pelagic sediment, with H_2O+=7.8% and no additional water, the liquidus temperature is 1240°C, the primary phases are garnet and kyanite. The subsolidus phase assemblage is phengite mica+garnet+clinopyroxene+coesite+kyanite. With 5 wt.% water added, the liquidus temperatures and primary phases for the calc-alkaline rocks are 1280°-1180°-1080°, garnet+clinopyroxene, garnet, and quartz respectively. Garnet and clinopyroxene occur throughout the melting interval of the olivine tholeiite for all water contents. Garnet is joined by clinopyroxene 80° below the andesite plus 5% H_2O liquidus, quartz is joined by clinopyroxene 180° below the rhyolite plus 5% H_2O liquidus. The subsolidus phase assemblage is garnet+clinopyroxene+coesite+minor kyanite for all the calc-alkaline compositions. We conclude that calc-alkaline andesites and rhyolites are not equilibrium partial melting pruducts of subducted oceanic crust consisting of olivine tholeiite basalt and siliceous sediments. Partial melting in subduction zones produces broadly acid and intermediate liquids, but these liquids lie off the calc-alkaline basalt-andesite-rhyolite join and must undergo modification at lower pressures to produce calcalkaline magmas erupted in overlying island arcs.

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Alternate Title:Melting relations of basalt-andesile-rhyolite-H2O and a pelagic red clay at 30 kb
Additional Information:© 1973 Springer-Verlag. Received July 30. 1973. We thank the National Science Foundation for Grant GA-29426 and the Advanced Research Projects Agency for Grant NSF GH 33636 MRL-Light which supported this research, P.C. Bateman and F.C. Dodge for supplying the tonalities and granite, C. Emiliani for supplying the pelagic sediment, and A.J. Irving and A.T. Anderson for critical reviews of the manuscript.
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Advanced Research Projects Agency (ARPA)UNSPECIFIED
Issue or Number:4
Record Number:CaltechAUTHORS:20160203-135647925
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ID Code:64201
Deposited By: Tony Diaz
Deposited On:03 Feb 2016 22:55
Last Modified:10 Nov 2021 23:27

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