Trace and minor element partitioning between garnet and amphibole and carbonatitic melt

Details Trace and minor element partitioning between garnet and amphibole and carbonatitic melt Trace and minor element partitioning between garnet and amphibole and carbonatitic melt

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.113....1s&link_type=abstract

Earth and Planetary Science Letters, Volume 113, Issue 1-2, p. 1-14.

Computer Science

17

Scientific paper

The very low viscosity of carbonatite melts potentially makes them a highly effective agent of mantle metasomatism and it is important to quantify how the interaction of these melts with a lherzolitic mantle may affect trace element budgets. Our experiments yield measurements of amphibole-carbonatite melt and garnet-carbonatite melt partition coefficients for the appropriate P,T conditions (18-33 kbar) for a suite of trace and minor elements (Ti, Nb, Zr, Ta, Ce, Lu, Y, Sr, Ba, Rb and K). Measured partition coefficients permit prediction of fractionation among trace element ratios in a carbonatite melt relative to garnet and amphibole in the mantle source for this melt. For example, equilibration of a carbonatite melt with garnet will not fractionate Zr/Y or Nb/Ta ratios in the melt but will decrease Zr/Nb, Lu/Y, Zr/LILE and Y/LILE ratios in the melt. A carbonatite melt in equilibrium with amphibole will fractionate Zr/Nb with Nb enrichment in the melt, but to a lesser extent than for garnet. Metasomatism of the mantle wedge beneath island arcs through addition of carbonatite melt may explain the lower Zr/Nb of island-arc basalts relative to mid-ocean ridge basalts. Ti behaved compatibly with garnet and amphibole in all experiments, implying relative depletion of Ti in coexisting carbonatite melt and a decrease in Ti/LILE ratio in such a melt under equilibrium conditions.

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