Physics
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997m%26ps...32..869b&link_type=abstract
Meteoritics & Planetary Science, vol. 32, no. 6, pages 869-875
Physics
18
Scientific paper
We have analyzed the modal abundances of twenty-three of the known twenty-four diogenites in thirty-one thin sections using an Energy Dispersive Spectrometer (EDS) and automated phase distribution analysis software. Orthopyroxene is predictably the most abundant phase, ranging from 27.7 vol. % to 99.8 vol. % in these samples. The grand average mode of all the analyzed diogenites includes the `olivine diogenites' but not ALH 85015, a probable howardite, and ALHA 81208, a sample with an abundant silica phase. The grand average of these 21 diogenites is: orthopyroxene 92.2 vol%, olivine 4.2 vol%, clinopyroxene 1.2 vol%, chromite 0.9 vol%, plagioclase 0.4 vol%, FeNi metal 0.1 vol%, troilite 0.6 vol%, and silica phase 0.4 vol%. Plagioclase feldspar is extremely depleted in all samples, with modal abundance from none detected to 4.6 vol% in range. Such a low volume of plagioclase may indicate that the diogenite parental melts originated in a source region depleted in Al (Warren, 1985; Stolper, 1975), consistent with crystallization from a melt derived from material that had previously experienced extraction of a eucrite-type melt.
Bowman L. E.
Papike James J.
Spilde Michael N.
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