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Jagoutz et al. (1980); Stosch et al. (1980); Menzies & Hawkesworth (1987); Menzies et al. (1985a); Van Kooten et al. (1985); Zindler & Jagoutz (1987). ocean basin. It can be deduced from these data that the source regions of alkaline magmas and of the overlying mantle as represented by the inclusions are isotopically quite similar. Exposures of peridotite in the ocean basins (Roden et al. 1984b) exhibit isotopic variability that falls within the limits of the data in Fig. 1. Roden et al. 2 • 103 Ma ago) trace-element enrichment related to alkaline magmatism.
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The geometrical analysis of partial fusion. Am. J. Sci. 267, 1178-94. SCLATER, J. , JAUPART, C. & GALSON, D. 1980. The heat flow through oceanic and continental crust and the heat loss of the Earth. Rev. Geophys. Space Phys. 18, 269-311. , HAGER, B. H. & JAYS, J. F. 1982. Melt segregation from partially molten source regions: the importance of melt density and source region size. J. geophys. Res. 86, 6261-71. TOZER, D. C. 1967. Towards a theory of mantle convection. In: GASKELL, T. F. ) The Earth's Mantle, pp.