Other
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004m%26ps...39.1591w&link_type=abstract
Meteoritics & Planetary Science, Vol. 39, No. 9, p.1591-1598
Other
7
Scientific paper
Several recent studies have shown that materials such as magnetite that formed in asteroids tend to have higher D17O (-d17O - 0.52 × d18O) values than those recorded in unaltered chondrules. Other recent studies have shown that, in sets of chondrules from carbonaceous chondrites, D17O tends to increase as the FeO contents of the silicates increase. We report a comparison of the O isotopic composition of olivine phenocrysts in low-FeO (£Fa1) type I and high-FeO (3Fa15) type II porphyritic chondrules in the highly primitive CO3.0 chondrite Yamato-81020. In agreement with a similar study of chondrules in CO3.0 ALH A77307 by Jones et al. (2000), D17O tends to increase with increasing FeO. We find that D17O values are resolved (but only marginally) between the two sets of olivine phenocrysts. In two of the high-FeO chondrules, the difference between D17O of the late-formed, high-FeO phenocryst olivine and those in the low-FeO cores of relict grains is well-resolved (although, one of the relicts is interpreted to be a partly melted amoeboid olivine inclusion by Yurimoto and Wasson [2002]). It appears that, during much of the chondrule-forming period, there was a small upward drift in the D17O of nebular solids and that relict cores preserve the record of a different (and earlier) nebular environment.
Rubin Alan E.
Wasson John T.
Yurimoto Hisayoshi
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