Other
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996eiaf.conf...12h&link_type=abstract
Workshop on Evolution of Igneous Asteroids: Focus on Vesta and the HED Meterorites, p. 12
Other
Chondrites, Meteoritic Composition, Meteorites, Oxygen Isotopes, Krypton Isotopes, Potassium Isotopes, Achondrites, Cosmochemistry, Vesta Asteroid, Snc Meteorites
Scientific paper
We present cosmochemical arguments for the origin of eucrites, and by inference the HED parent body (Vesta or otherwise), indicating that these formed from distinct nebular materials, unrelated to any known type of chondrite. We find this result to be generally true for all the known planetary compositions: the Earth, Moon, SNC meteorites (Mars), and HED meteorites. Two isotopic constraints prove to be important here: O isotopes ((17)O/(16)O and (18)O/(16)O), which fingerprint various nebular reservoirs, and K isotopes ((41)K/(39)K), which are diagnostic of nebular vs. planetary formational processes related to the mechanisms of volatile-element depletion. Planetary compositions are to first-order chondritic in their abundances of major elements, but differ from known chondrites in having a larger degree of volatile element depletion in all elements with condensation temperatures lower than those of Mg and Si, e.g., Mn, K, P, Rb, Cs, S, Pb, Tl, etc.
Clayton Robert N.
Humayun Munir
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