Lack of subsolidus REE exchange between pyroxene and phosphate in the Roda diogenite

Details Lack of subsolidus REE exchange between pyroxene and phosphate in the Roda diogenite Lack of subsolidus REE exchange between pyroxene and phosphate in the Roda diogenite

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..377f&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 377.

Other

Meteoritic Composition, Pyroxenes, Phosphates, Rare Earth Elements, Trace Elements, Petrogenesis

Scientific paper

The orthopyroxene phase of the diogenites has been extensively studied in hopes of finding clues to the petrogenesis of the howardite, eucrite, diogenite (HED) parent body. In the course of the studies, it was noted (Mittlefehldt, 1994 and Fowler et al., 1995) that Roda was a compositional outlier due to its extreme range in trace elements. The ranges of REE found in Roda by the researchers cited above were as large or larger than the range of the entire suite of other diogenites. Most diogenites show a finite but limited range of trace elements. The extreme range of trace element concentrations in Roda might be explained by the diffusion of these elements into orthopyroxene from a phosphate or trapped melt phase. This theory is tested in this study.

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