Crystallization of magmatic iron meteorites: The role of mixing in the molten core

Details Crystallization of magmatic iron meteorites: The role of mixing in the molten core Crystallization of magmatic iron meteorites: The role of mixing in the molten core

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999m%26ps...34..235c&link_type=abstract

Meteoritics & Planetary Science, vol. 34, no. 2, pp. 235-246 (1999).

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The IIIAB group is the largest of the magmatic iron meteorite groups and consequently is commonly used to test models of asteroid core crystallization. Simple fractional crystallization calculations appear to reproduce the general shape of the elemental trends observed in the IIIAB group when these trends are plotted versus Ni, as is traditionally done. However, when the elemental trends are examined versus another element, such as Ge versus Ir, simple fractional crystallization fails to match a significant portion of the trend, specifically meteorites formed during the final stages of crystallization. Our simple mixing model which attempts to account for the possibility of inhomogeneities in the molten metallic core is able to reproduce the entire IIIAB trend observed. This model is a variant of simple fractional crystallization and involves mixing between a zone of liquid involved in the crystallization process and a second zone too far from the crystallizing solid to be actively involved in crystallization. This model does not suggest one unique solution for the method by which an asteroidal core crystallizes; rather it demonstrates that including the effects of mixing in the molten core can account for the observed IIIAB elemental trends, particularly the late stage crystallizing members, which other models have difficulty explaining.

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