Petrogenetic Models for the Origin of Diogenites and Their Relationship to Basaltic Magmatism on the HED Parent Body

Details Petrogenetic Models for the Origin of Diogenites and Their Relationship to Basaltic Magmatism on the HED Parent Body Petrogenetic Models for the Origin of Diogenites and Their Relationship to Basaltic Magmatism on the HED Parent Body

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1181s&link_type=abstract

Lunar and Planetary Science, volume 27, page 1181

Other

Diogenites, Elements: Trace, Eucrites, Meteorites: Hed, Orthopyroxene

Scientific paper

Diogenites have long been recognized as a major constituent of the HED meteorite group. Yet, their rather remarkable monotonous mineralogy (generally greater than 92% orthopyroxene and less than 1% plagioclase) and mineral chemistry (Fe/Fe + Mg in orthopyroxene = .21 to .30) has limited the extent diogenites could be used to reconstruct HED parent body magmatism. Recently, several papers exploring the trace element characteristics of diogenites have identified trace element systematics that appeared to mimic simple magmatic processes involving large degrees of fractional crystallization (60% to over 90%). However, several observations eliminate fractional crystallization as the primary process linking all the diogenites. Based on reasonable basaltic magma compositions, changes in temperature during orthopyroxene crystallization, and observations in terrestrial layered intrusions it is highly unlikely that extensive degrees of fractionation of a single basaltic magma (60% to 90%) should crystallize only orthopyroxene. The purpose of this paper is to explore other potential process for the chemical variability observed in diogenites and the relationship of diogenites to other HED lithologies.

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