Evolution of an alkali basalt-trachyte suite from Jebel Marra volcano, Sudan, through assimilation and fractional crystallization

Details Evolution of an alkali basalt-trachyte suite from Jebel Marra volcano, Sudan, through assimilation and fractional crystallization Evolution of an alkali basalt-trachyte suite from Jebel Marra volcano, Sudan, through assimilation and fractional crystallization

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..95..141d&link_type=abstract

Earth and Planetary Science Letters, Volume 95, Issue 1-2, p. 141-160.

Computer Science

18

Scientific paper

The suite of alkalic basalts and differentiates (hawaiites, mugearites and trachytes) erupted at Jebel Marra volcano, Sudan, provides an excellent opportunity to examine the differentiation history of mantle-derived magmas. Crystal fractionation exerts a control on major element compositions although variations in incompatible element and isotopic ratios among the more evolved volcanic rocks require open system behavior. The basement at Jebel Marra is compositionally unlike the basalts, with much higher 87Sr/86Sr, δ18O and Rb/Nb, together with highly variable Pb isotopic compositions and low 143Nd/144Nd. The strong compositional contrast between crust and magma alllows the influence of crustal interaction on magma compositions to be assessed. Simple two-component bulk mixing trends are not observed, but models of simultaneous assimilation and fractional crystallization (AFC) reproduce many of the data trends. It is suggested that contamination takes place at more than one stage, with a change in the composition of the assimilant at different levels, coupled with a change in the rate ratio of assimilation to crystal fractionation.
Present address: British Petroleum Development Ltd, Britannic House, Moor Lane, London EC2Y 9BU, U.K.

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