Computer Science
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997gecoa..61.5089p&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 61, p. 5089
Computer Science
5
Pyroxenes, Rare Earth Elements, Ion Probes, Meteoritic Composition, Mass Spectroscopy, Minerals
Scientific paper
The trace-element systematics have been examined of plagioclase grains that coexist with inverted pigeonites of the cumulate eucrites. This is done in order to attempt to elucidate the relationship between the cumulate eucrites and the non-cumulate (main series) eucrites. The analyses were carried out using secondary ion mass spectrometry. Using trace-element concentrations of several pyroxenes and the plagioclase in this study, the subsolidus partition coefficients for the REEs and Y between plagioclase and pyroxenes in the examined cumulate eucrites were calculated. The calculated parental-melt patterns determined from both pyroxene and plagioclase are variable and often differ by a factor of four to five times for individual REEs. To explain the discrepancy between the differing melt patterns of pyroxene and plagioclase, it is suggested that the mineral phases may have experienced subsolidus elemental redistribution.
Layne Graham D.
Papike James J.
Pun Aurora
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