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By J. G. Fitton, Bridget Gilfillan Upton

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Caldeira volcano, Graciosa, Azores: Progress Report. J. geol. Soc. Lond, 139, 658. MENZIES, M. & MURTHY, V. R. 1980a. Mantle metasomatism as a precursor to the genesis of alkaline magmas--isotopic evidence. Am. J. Sci. 280A, 622-38. - & 1980b. Nd and Sr isotope geochemistry of hydrous mantle nodules and their host alkali basalts: implications for local heterogeneities in metasomatically veined mantle. Earth planet. Sci. Lett. 46, 323-34. OLAFSSON, M. & EGGLER, D. H. 1983. Phase relations of amphibole, amphibole-carbonate, and phlogo- Mantle metasomatism pite-carbonate peridotite: petrologic constraints on the asthenosphere.

A. 1982. Petrology and trace element geochemistry of the Honolulu volcanics, Oahu: implications for the oceanic mantle below Hawaii. J. Petrol. 23, 447-504. COHEN, R. S. & O'NIONS, R. K. 1982. The lead, neodymium and strontium isotopic structure of ocean ridge basalts. J. Petrol. 23, 299-324. , & DAWSON,J. B. 1984. Isotope geochemistry of xenoliths from East Africa: implications for development of mantle reservoirs and their interaction. Earth planet. Sci. Lett. 68, 209-20. DE PAOLO,D. 1978. Nd and Sr isotopic systematics of young continental igneous rocks.

In: SORENSEN, H. ) The Alkaline Rocks, pp. 412-420. Wiley, New York. RICHARDSON, S. , GURNEY, J. , ERLANK, A. J. & HARRIS, J. W. 1984. Origins of diamonds in old enriched mantle. Nature, Lond. 310, 198-202. ROCK, N. M. S. 1976. The comparative strontium isotopic composition of alkaline rocks: new data from southern Portugal and East Africa. Contrib. Mineral. Petrol. 56, 205-28. RODEN, M. , FREY, F. A. & FRANCIS, D. i . 1984a. An example of consequent mantle metasomatism in peridotite inclusions from Nunivak Island, Alaska.

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