Planetoid core crystallisation and fractionation - Evidence from the Agpalilik mass of the Cape York iron meteorite shower

Details Planetoid core crystallisation and fractionation - Evidence from the Agpalilik mass of the Cape York iron meteorite shower Planetoid core crystallisation and fractionation - Evidence from the Agpalilik mass of the Cape York iron meteorite shower

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pepi...29..218e&link_type=abstract

(NATO, Advanced Study Institute on Early Evolution of the Planets and their Atmospheres, Newcastle-upon-Tyne, England, Mar. 23-A

Physics

10

Asteroids, Chemical Fractionation, Crystallization, Iron Meteorites, Planetary Cores, Planetary Evolution, Dendritic Crystals, Earth Core, Geochemistry, Metallography, Meteoritic Composition

Scientific paper

Metallographic and chemical study of the Agpalik mass of the Cape York iron meteorite shower reveals evidence of the mode of crystallization and fractionation of key elements consistent with a dendritic solidification of at least part of the once fully molten parent body's metallic core. Chemical gradients of Ir and Au are assessed across an 85 cm section that is inferred to be perpendicular to the parent body's gravitational field, and are interpreted as representing a dendritic growth mode. The characteristic elongated and orientated sulfide nodules found in Agpalik signify trapped liquid of the latest stages of crystallization. Detailed mineralogical and chemical characterization of the Agpalik liquid-solid transformation products allow modelling of the entire crystallization history commencing with dendritic metal precipitation through an ultimate troilite-taenite-Cu eutectic, representing a crystallization range spanning approximately 1350-700 C.

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