Formation of eucrites and diogenites on a Vesta-sized asteroid. II - Equilibrium crystallization of a chondritic magma ocean

Details Formation of eucrites and diogenites on a Vesta-sized asteroid. II - Equilibrium crystallization of a chondritic magma ocean Formation of eucrites and diogenites on a Vesta-sized asteroid. II - Equilibrium crystallization of a chondritic magma ocean

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28.1179r&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 179.

Computer Science

2

Vesta Asteroid, Crystallization, Thermodynamic Equilibrium, Magma, Chondrites, Minerals, Oceans, Liquid Phases

Scientific paper

Having demonstrated that the HED parent body may have a small core that separated during a global magma ocean episode, we can now evaluate whether the eucrites and diogenites may represent the residual liquids and cumulates formed during the crystallization of such an ocean. The HED parent body mantle composition will differ from the bulk chondritic composition after separation of an Fe-rich metallic core, even if the core is small. The most important difference will be the Mg/(Mg+Fe) ratio (Mg no.) of the mantle material; separation of a metallic core will increase this ratio over the bulk chondritic value, thus having an impact on the composition of phases crystallizing from a magma ocean. We have used the thermodynamics-based computer program MELTS to consider the cooling histories (fractional or equilibrium crystallization) of the possible mantle compositions (bulk chondrite minus core). One interesting feature of all the fractional crystallization trends is that they become too FeO-rich at the eucritic SiO2 and MgO contents, thus indicating that fractional crystallization of a chondritic magma ocean cannot produce a eucritic residual liquid. The liquids produced by equilibrium crystallization all come closer to eucritic liquids at 80-85 percent crystallization. We show that a molten mantle originating from ordinary chondrite material could be the initial magma composition leading to both the diogenite cumulates and the eucritic basalts and cumulates.

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