Melting relations of basalt-andesile-rhyolite-H2O and a pelagic red clay at 30 kb (original) (raw)
Abstract
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 H2O+=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% H2O liquidus, quartz is joined by clinopyroxene 180° below the rhyolite plus 5% H2O 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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References
- Armstrong, R. L.: A model for the evolution of strontium and lead isotopes in a dynamci earth. Rev. Geophys. 6, 175–199 (1968)
Google Scholar - Boettcher, A. L., Wyllie, P. J.: Melting of granite with excess water to 30 kilobars pressure. J. Geol. 76, 235–244 (1968)
Google Scholar - Bowen, N. L.: The evolution of the igneous rocks. Princeton: Univ. Press 1928
Google Scholar - Brown, G. C., Fyfe, W. S.: The production of granite melts during ultrametamorphism. Contr. Mineral. and Petrol. 28, 310–318 (1970)
Google Scholar - Coats, R. R.: Magma type and crustal structure in the Aleutian arc. In: G. A. MacDonald, H. Kuno, eds. The crust of the Pacific Basin. AGU Monograph 6, 94–106 (1962)
- Dewey, J. F., Bird, J. M.: Mountain belts and the new global tectonics. J. Geophys. Res. 75, 2625–2647 (1970)
Google Scholar - Dickinaon, W. R.: Relations of andesites, granites, and derivative sandstones to arc-trench tectonics. Rev. Geophys. Space Phys. 8, 813–860 (1970)
Google Scholar - Dickinson, W. R.: Plate tectonic models of geosynclines. Earth Planet. Soi. Lett. 10, 165–174 (1971)
Google Scholar - Gilluly, J.: Plate tectonic and magmatic evolution. Geol. Soc. Am. Bull. 82, 2383–2396 (1971)
Google Scholar - Green, T. H.: Crystallization of calc-alkaline andesite under controlled high-pressure hydrous conditions. Contr. Mineral. and Petrol. 34, 150–166 (1972)
Google Scholar - Green, T. H., Ringwood, A. E.: Genesis of the calc-alkaline igneous rock suite. Contr. Mineral. and Petrol. 18, 105–162 (1968)
Google Scholar - Green, T. H., Ringwood, A. E.: Crystallization of garnet-bearing rhyodacite under high-pressure hydrous conditions. J. Geol. Soc. Australia 19, 203–212 (1972)
Google Scholar - Hamilton, W.: Mesozoic Calivornia and the underflow of Pacific mantle. Geol. Soc. Am. Bull. 80, 2409–2430 (1969)
Google Scholar - Isacks, B., Oliver, J., Sykes, L. R.: Seismology and the new global tectonics. J. Geophys. Res. 73, 5855–5899 (1968)
Google Scholar - Jakes, P., White, A. J. R.: K/Rb ratios of rocks from island arcs. Geochim. Cosmochim. Acta 34, 849–856 (1970)
Google Scholar - Lambert, I. B., Wyllie, P. J.: Melting in the deep crust and upper mantle and the nature of the low velocity layer. Phys. Earth Planet. Interiors 3, 316–322 (1970)
Google Scholar - Lambert, I. B., Wyllie, P. J.: Melting of gabbro (quartz eclogite) with excess water to 35 kilobars with geologic applications. J. Geol. 80, 693–708 (1972)
Google Scholar - Nicholls, I. A., Ringwood, A. E.: Effect of water on olivine stability in tholeiites and the production of silicasaturated magmas in the island-arc environment. J. Geol. 81, 285–300 (1973)
Google Scholar - Oxburgh, E. R., Turcotte, D. L.: Thermal structure of island arcs. Geol. Soc. Am. Bull. 81, 1665–1688 (1970)
Google Scholar - Presnall, D. C.: The geometric analysis of partial fusion. Am. J. Sci. 267, 1178–1194 (1969)
Google Scholar - Robertson, J. K., Wyllie, P. J.: Rook-water systems, with special reference to the waterdeficient region. Am. J. Sci. 271, 252–277 (1971)
Google Scholar - Stern, C. R., Wyllie, P. J.: Water-saturated and undersaturated melting relations of a granite to 35 kilobars. Earth Planet. Sci. Lett. 18, 163–167 (1973)
Google Scholar - Toksoz, M. N., Minear, J. W., Julian, B. R.: Temperature field and geophycical effects of a downgoing slab. J. Geophys. Res. 76, 1113–1138 (1971)
Google Scholar
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- Department of the Geophysical Sciences, The University of Chicago, 60637, Chicago, Illinois, USA
C. R. Stern & P. J. Wyllie
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- C. R. Stern
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Stern, C.R., Wyllie, P.J. Melting relations of basalt-andesile-rhyolite-H2O and a pelagic red clay at 30 kb.Contr. Mineral. and Petrol. 42, 313–323 (1973). https://doi.org/10.1007/BF00372609
- Received: 30 July 1973
- Issue Date: December 1973
- DOI: https://doi.org/10.1007/BF00372609