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By J. G. Fitton, Bridget Gilfillan Upton

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5. Discussion of the relevant applications of channelling volatiles through a narrow zone in the lithosphere ('pie-funnel effect') can be found in Bailey (1980b; 1983). magmas constitute major embarrassments for continuous differentiation. Explanations for individual volcanoes have been attempted, but the case for continuous differentiation is lost when the activity is seen in regional context. It is hardly conceivable that the volcanoes strung along the Terceira rift should all be spectacularly successful products of high-level differentiation while the volcanoes on the other islands outside the rift have effectively failed.

Nature, Lond. 274, 544-8. , RODDICK, J. & DAWSON, J. 1983. Trace element and isotope studies on veined, metasomatic and 'MARID' xenoliths from Bultfontein, South Africa. Earth planet. Sci. Lett. 65, 90-106. - - , SMITH, C. , LOCK, N. , HARMON, R. S. & BOYD, F. R. 1981. Can kimberlites be generated from ordinary mantle? Nature, Lond. 291, 53-6. , GAMBLE, J. & MENZIES, M. 1985. Metasomatised ultramafic xenoliths from Foster Crater, Antarctica. Trans. Amer. geophys. Union 66, 409. MCCULLOCH, M. , JAQUES, A.

311, 331-55. HOFMANN, A. & WrotE, W. M. 1982. Mantle plumes from ancient oceanic crust. Earth planet Sci. Lett. 57, 421-36. IRVING, A. J. & FREY, F. A. 1984. Trace element abundances in megacrysts and their host basalts: constraints on partition coefficients and megacryst genesis. Geochim. cosmochim. Acta, 45, 1201-21. & PRICE, G. 1981. Geochemistry and evolution of Iherzolite-bearing phonolitic lavas from Nigeria, Australia, East Germany and New Zealand. Geochim. cosmochim. Acta, 45, 1309-20. , CARLSON, R.

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