Phase equilibrium constraints on the howardite-eucrite-diogenite associationModel determinations of fractional crystallization and equilibrium partial melting in the 0-10-kbar range have been performed for a series of compositions relevant to diogenite and eucrite petrogenesis. Olivine is found to react with diogenite parent liquids along the plagioclase-absent olivine/low-Ca pyroxene liquidus boundary under conditions of both fractional and equilibrium crystallization up to about 2 kbar. Olivine also reacts with eucritic liquids saturated with plagioclase and low-Ca pyroxene to pressures in excess of 2 kbar. The ability of simple fractional crystallization at 2 kbar to account for mineralogical and chemical features of the diogenite-eucrite association is discussed.
Document ID
19890023516
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Longhi, John (Yale Univ. New Haven, CT, United States)
Pan, Vivian (Yale University Hew Haven, CT, United States)