Physics
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1063p&link_type=abstract
Lunar and Planetary Science, volume 27, page 1063
Physics
1
Diogenites, Eucrites: Cumulate, Feldspar, Ion Probe, Pyroxene
Scientific paper
The howardites, eucrites and diogenites are thought to be genetically related meteorites based on their geochemical and petrographic attributes and thought to have formed on the same parent body, 4 Vesta, by magmatic activity and impact-brecciation events. In our attempt to relate the cumulate eucrites to the diogenites and noncumulate (main series) eucrites, we have examined the trace-element systematics of plagioclase grains that co-exist with inverted pigeonites of the cumulate eucrites by SIMS. Trace-element abundances of plagioclase show limited variability within grains from each cumulate, but are variable among the four cumulates analyzed: Moama, Moore County, Serra de Mage and Binda. The average chondrite-normalized REE abundances of the plagioclase grains of the cumulates range from 1.7-10.3x CI in the LREE and from 0.09-0.26x CI in the HREE with positive Eu anomalies ranging from approximately 18-23x CI. The uncertainties of the abundances of the HREE are greater than those of the LREE because the abundances of the HREE are very close to their detection limits.
Layne Graham D.
Papike James J.
Pun Aurora
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