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By J. G. Fitton, Bridget Gilfillan Upton

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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. Earth planet. Sci. Lett. 64, 305-15. OLDENBURG, D. W. 1981. Conductivity structure of oceanic upper mantle beneath the Pacific plate.

1984). Inclusions with the least radiogenic Nd isotopic composition were entrained by kimberlitic and alkaline magmas erupted through old stable cratonic regions (Menzies & Murthy 1980b; Cohen et al. 1984; Menzies & Halliday 1984; Richardson et al. 1984). Diopsides sepa- -10 I -15 I -20 I -25 I s -30 I Nd ] ] ULTRAMAFIC O~LSOUTH AFRICA XENOLITHS (Lithosphere) F TANZANIA 1 CALIFORNIA- i ] COL::A:~N-A NEW MEXICO I ...... 5100 143Nd / 144Nd FIG. 5. Nd isotopic variation in host magmas and mantle inclusions erupted through stable cratons, in rift valleys and ocean basins.

46, 323-34. - - & 1980b. Enriched mantle: Nd and Sr isotopes in diopsides from kimberlite nodules. Nature, Lond. 283, 634-6. --& WASS, S. Y. 1983. COz rich mantle below eastern Australia: REE, Sr and Nd isotopic study of Cenozoic alkaline magmas and apatite-rich xenoliths, Southern Highlands Province, New South Wales, Australia. Earth planet. Sci. Lett. 65, 287-302. - - , KEMPTON, P. & DUNGAN, M. 1985a. J. , 26, 663-93. - - , KYLE, P. & GAMBLE,J. 1985b. Fragments of aged enriched sub-continental lithosphere entrained in asthenospheric magmas erupted at Foster Crater, Antarctica.

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