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

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996eiaf.conf...28s&link_type=abstract

Workshop on Evolution of Igneous Asteroids: Focus on Vesta and the HED Meterorites, p. 28

Other

Achondrites, Chondrites, Crystallization, Igneous Rocks, Lithology, Magma, Meteoritic Composition, Pyroxenes, Thermodynamics, Mineralogy, Trace Elements, Mathematical Models

Scientific paper

Diogenites have long been recognized as a major constituent of the HED meteorite group. Yet their remarkable monotonous mineralogy has limited the extent to which diogenites have been used to reconstruct HED parent body (HEDPB) magmatism. 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 >90%). However, 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 (60-90%) should be the primary process linking all the diogenites. Recent chondrite partial melting experiments also question a simple relationship between eucrites and diogenites. Our purpose is to explore other potential processes for the chemical variability observed in diogenites and the petrogenetic relationship of diogenites to other HED lithologies. We are using two different and complementary approaches. First, we are using thermodynamic calculations (MELTS) to model partial melting of both measured chondrite compositions and calculated HEDPB mantle compositions. A total of 20 different bulk compositions have been used. Initial calculations were made at the IW buffer and evaluate both batch and fractional melting processes. Second, we are using these predicted phase relationships and melt compositions to calculate trace-element characteristics of primary and secondary melts produced by partial melting.

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