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Nature, Lond. 296, 525-30. 1983. The chemical and thermal evolution of rifts. Tectonophysics, 94, 585-97. - 1984. Kimberlite: 'the mantle sample' formed by ultrametasomatism. In: KORNPROBST, J. ) Kimberlites. 1 : Kimberlites and Related Rocks, pp. 323-33. Developments in Petrology 11 A, Elsevier, Amsterdam. - 1986. Fluids, melts, flowage and styles of eruption in alkaline ultramafic magmatism. Trans. geol. Soc. Afr. 88 (2), 449-57. -& MACDONALD, R. 1987. Dry peralkaline felsic liquids and carbon dioxide flux through the Kenya rift zone.
These conditions are summarized in sections 0 and 30 in Figs 5 and 6. Melt generation from two distinct sources can account for the following characteristics of this magmatic association: 1 Composition gaps. Intermediate compositions may be formed but are not essential to petrogenesis. 2 Volume discrepancies. The relative volume of mafic-to-felsic magma results from the interplay of melt percolation and mafic melt diapirism. 3 Timing. Characteristic magmatic diversity results simply from the fluctuating interplay of volatile flux and melt generation (irreversibility is not an issue).
J. Sci. 280A, 594621. , BRICE, W. , ELLIS, D. , GREEN, D. , HARRIS, K. L. & RYABCHIKOV, I. D. 1983. Pyroxene-carbonate reactions in the upper mantle. Earth planet. Sci. Lett. 62, 63-74. 1963. Relative abundance of intermediate members of the oceanic basalt-trachyte association. J. geophys. Res. 68 (5), 1519-34. CLARK, S. P. & RINGWOOD, A. E. 1964. Density distribution and constitution of the mantle. Rev. geophys. 2, 35. DALY, R. A. 1925. The geology of Ascension Island. Proc. Am. Acad. Arts Sci 60, 1-80.
Alkaline igneous rocks by J. G. Fitton, Bridget Gilfillan Upton