Olivine-dominated asteroids and meteorites: Distinguishing nebular and igneous histories

Details Olivine-dominated asteroids and meteorites: Distinguishing nebular and igneous histories Olivine-dominated asteroids and meteorites: Distinguishing nebular and igneous histories

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007m%26ps...42..155s&link_type=abstract

Meteoritics & Planetary Science, vol. 42, Issue 2, p.155-170

Mathematics

Logic

13

Scientific paper

Melting models indicate that the composition and abundance of olivine systematically co-vary and are therefore excellent petrologic indicators. However, heliocentric distance, and thus surface temperature, has a significant effect on the spectra of olivine-rich asteroids. We show that composition and temperature complexly interact spectrally, and must be simultaneously taken into account in order to infer olivine composition accurately. We find that most (7/9) of the olivine-dominated asteroids are magnesian and thus likely sampled mantles differentiated from ordinary chondrite sources (e.g., pallasites). However, two other olivine-rich asteroids (289 Nenetta and 246 Asporina) are found to be more ferroan. Melting models show that partial melting cannot produce olivine-rich residues that are more ferroan than the chondrite precursor from which they formed. Thus, even moderately ferroan olivine must have non-ordinary chondrite origins, and therefore likely originate from oxidized R chondrites or melts thereof, which reflect variations in nebular composition within the asteroid belt. This is consistent with the meteoritic record in which R chondrites and brachinites are rare relative to pallasites.

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