Synthetic and natural Nakhla pyroxenes: Parent melt composition and REE partition coefficients

Details Synthetic and natural Nakhla pyroxenes: Parent melt composition and REE partition coefficients Synthetic and natural Nakhla pyroxenes: Parent melt composition and REE partition coefficients

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994lpi....25..883m&link_type=abstract

In Lunar and Planetary Inst., The Twenty-Fifth Lunar and Planetary Science Conference. Part 2: H-O p 883-884 (SEE N94-36136 11-9

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4

Crystallization, Melts (Crystal Growth), Meteorites, Meteoritic Composition, Mineralogy, Petrology, Pyroxenes, Trace Elements, Estimates, Mars (Planet)

Scientific paper

Nakhla is one of the SNC meteorites, generally believed to be of martian origin. It is composed mainly of cumulus augite, in which primary igneous zoning is apparently preserved, and which serves as a recorder of the composition of Nakhla's parent melt and the conditions under which it crystallized. Knowledge of the composition and petrogenesis of this parent melt may help unravel Nakhla's relationship to the other SNC's, and provide clues to martian petrogenesis in general. This abstract reports new results of an ongoing study in which we are (1) comparing the major and minor element compositions of synthetic pyroxenes crystallized from various proposed parent melt compositions with those in Nakhla pyroxene to constrain the composition of the parent melt, and (2) measuring minor and trace element partition coefficients, particularly those of the REE, in order to obtain the most applicable D values with which to invert the natural pyroxene compositions to obtain the trace element composition of the parent melt. Results suggest that recent estimates of Nakhla's parent melt composition are too aluminous, and that mafic or ultramafic melts are more likely candidates.

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