Preservation of a nebular mg-Delta O-17 correlation during partial melting of ureilites

Details Preservation of a nebular mg-Delta O-17 correlation during partial melting of ureilites Preservation of a nebular mg-Delta O-17 correlation during partial melting of ureilites

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..435g&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 435.

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2

Nebulae, Ureilites, Oxygen 17, Melting, Chondrites, Meteoritic Composition, Igneous Rocks, Minerals, Olivine, Pyroxenes, Allende Meteorite

Scientific paper

Ureilites are a class of over 50 achondrites that display a bewildering mix of igneous and primitive characteristics. This work addresses the apparent incompatibility of the mineralogy and lithophile element chemistry of ureilites with their oxygen isotopic characteristics. One problem presented by the oxygen isotopic characteristics of ureilites is that ureilites show a correlation of the olivine and pyroxene mg ratio with delta O-17. Such correlations are otherwise observed only in very primitive materials such as among chondrules and their rims in Allende, and among the H-L-LL ordinary chondrite groups. The question is whether a nebular mg-delta O-17 correlation could survive the partial melting necessary to produce ureilites from chondritic material. Goodrich (1992) assumed that it could not, because ureilites would not be expected to have all undergone precisely the same degree of melting. Results of model calculations are presented here to test this assumption. From the results, it does appear that a nebular mg-delta O-17 correlation could survive the partial melting required to produce ureilites from chondritic material. Questions, however, still remain, and are posed at the conclusion of the paper.

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