Residual peridotites and the mechanisms of partial melting

Details Residual peridotites and the mechanisms of partial melting Residual peridotites and the mechanisms of partial melting

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..74..251p&link_type=abstract

Earth and Planetary Science Letters, Volume 74, Issue 2-3, p. 251-265.

Computer Science

47

Scientific paper

Using the isotope dilution technique, we have determined rare earth element abundances in the New Caledonian ophiolitic melting residues. The main problem dealt with is the mechanism of partial melting as constrained by the partitioning of incompatible elements during melting (i.e. batch, fractional or disequilibrium melting).
All samples have very low REE concentrations (from 2 × 10-3 to 2 × 10-2 times chondrites for MREE). Both interlayered dunites and harzburgites yield similar U-shaped patterns characteristic of residual materials. In those residues, frequent negative Eu anomalies show that some of the partial melting occurred in the plagioclase facies, although plagioclase is not present now in these rocks.
Using available melting models, it is difficult to account for the data on both residues and lavas. We propose the Sequential Integrated Disequilibrium melting model, which allows quantitative agreement with these data. In this model, melting begins in the garnet lherzolite facies, and ends in the plagioclase facies.

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