Computer Science
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57..675c&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 57, no. 3, p. 675-682.
Computer Science
14
Achondrites, Geochemistry, Meteoritic Composition, Petrography, Planetary Cores, Enstatite, Meteoritic Microstructures, Meteorites, Stony Meteorites, Achondrites, Aubrites, Origin, Metal, Composition, Core, Formation, Interior, Samples, Meteorite, Iron, Nickel, Particles, Parent Bodies, Segregation, Siderophiles, Inaa, Fractionation, Silicates, Melting, Differentitation, Petrography, Geochemistry, Laboratory Studies, Procedure, Microprobe Methods, Neutron Activation Analysis, Schreibersite, Perryite, Kamaci
Scientific paper
Aubrites are differentiated stone meteorites with small amounts of metal. Study of eight aubrites reveals that Fe,Ni grains occur in a variety of textures, from irregular micron-sized particles to rounded nodules of up to 1.5 cm in diameter. The pattern of siderophile element abundances in the silicates is characteristic of igneous metal segregation (the more siderophilic elements are more depleted). Despite large uncertainties in metal/silicate distribution coefficients, the calculated minimum metal content of the aubrite precursor is not unlike that of enstatite chondrites and suggests that metal segregation was an extensive process in the early magmatic evolution of the aubrite parent body. However, the lack of appreciable fractionation in the trace element signature of the metal suggests that the metal now observed in aubrites did not undergo fractional crystallization in a core. We argue instead that the analyzed metal nodules represent a fraction of the iron-nickel that, during partial melting, was not completely segregated from the silicates.
Casanova Ignacio
Keil Klaus
Newsom Horton E.
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