Computer Science
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989metic..24..233w&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 24, Dec. 1989, p. 233-246.
Computer Science
23
Geochemistry, Meteoritic Composition, Meteoritic Damage, Ureilites, Basalt, Chemical Composition, Electron Probes, Fractionation, Radiochemistry, Rare Earth Elements
Scientific paper
Bulk-compositional data for the EET83309 polymict ureilite were obtained using INAA and radiochemistry procedures and electron probe analysis. It was found that the EET83309 has a bulk composition indistinguishable from ordinary ('monomict') ureilites for all elements except light-middle REEs (which are present in much higher concentrations), suggesting that polymict ureilites are mixtures of ordinary ureilites which were mixed on a very small number of parent bodies. Despite the light-REE enrichments, polymict ureilites are nearly devoid of basaltic (Al-rich) material. It is suggested that the missing basalt may have been blown off the parent body by a partially disruptive collision with a large C-rich projectile. This impact model of ureilite origin reconciles many paradoxical aspects of ureilite composition.
Kallemeyn Gregory W.
Warren Paul H.
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