Catastrophic Impact During Differentiation of the IAB-Winonaite Parent Asteroid

Details Catastrophic Impact During Differentiation of the IAB-Winonaite Parent Asteroid Catastrophic Impact During Differentiation of the IAB-Winonaite Parent Asteroid

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27...95b&link_type=abstract

Lunar and Planetary Science, volume 27, page 95

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Asteroids, Break-Up And Reassembly, Cores: Formation, Impacts, Meteorites: Iab Iron, Meteorites: Winonaite

Scientific paper

IAB iron meteorites contain angular, unmelted, chondritic rock fragments resembling winonaites; they may be derived from a single body. Two models have been proposed to account for the silicate inclusions and the compositional range of the metal. Kracher proposed that fractional crystallization of a S-saturated core could produce the observed siderophile element trends. Wasson and coworkers suggested that these meteorites could have formed in individual impact melt pools in the megaregolith on a common parent body. Kracher's model does not adequately explain mixing of molten metal with unmelted silicates. The impact model explains the brecciation and mixing, but cannot account satisfactorily for lithologies formed by partial melting. We are exploring break-up and reassembly of a hot, partially differentiated body as an alternative model that combines the best features of the other models. Prior to the impact, sulfur-rich molten metal began to drain to the center of the body. Silicates experienced some melting as well, producing basaltic melts and olivine-rich residues. Before core formation was complete, we suggest that an impact disrupted the body, mixing silicates into molten metal (represented by IAB irons with silicate inclusions) and olivine-rich residues into unmelted silicate rock (winonaites). Preliminary results of computer modelling indicate that core material can be scrambled and mixed with silicate material from the overlying mantle of the body in a break-up and reassembly scenario.

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