Download e-book for kindle: Alkaline igneous rocks by J. G. Fitton, Bridget Gilfillan Upton

By J. G. Fitton, Bridget Gilfillan Upton

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MENZIES, M. A. 1984. Mantle enrichment processes. Nature, Lond. 311 (5984) 331-5. KENNEDY, C. S. & KENNEDY, G. C. 1976. The equilibrium boundary between graphite and diamond. J. geophys. Res. 81, 2467-70. LLOYD, F. E. 1981. Upper-mantle metasomatism beneath a continental rift: clinopyroxenes in alkali mafic lavas and nodules from S. W. Uganda. Mineralog. Mag. 44, 315-23. - - 1 9 8 5 . Melting experiments on glassy olivine melilitites from strongly potassic mafic volcanics ofS. W. Uganda. Contrib.

Characteristic magmatic diversity results simply from the fluctuating interplay of volatile flux and melt generation (irreversibility is not an issue). 4 Synchroneity. Both felsic and mafic magmas can be available for eruption at all times. 5 Megacrysts. These are typically erupted in explosive diatremic activity and show significant differences from megacrysts associated with ultramafic magmatism. They are commonly amphibole and feldspar in the alkali basalt association and are explicable in terms of near-solidus formation.

SMITH, C. B. 1983. Pb, Sr and Nd isotopic evidence for sources of southern African Cretaceous kimberlites. Nature, Lond. 304, 51-4. , UNRUH, D. & TATSUMOTO,M. 1983. Pb, Sr, Nd and Hf isotopic evidence of multiple sources for Oahu, Hawaii basalts. Nature, Lond. 304, 259. STOSCH, H. , CARLSON, R. W. & LUGMAIR, G. W. 1980. Episodic mantle differentiation: Nd and Sr isotopic evidence. Earth planet. Sci Lett. 47, 26371. 27 STUCKLESS, J. S. & ERICKSEN, R. L. 1976.

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