Mathematics – Logic
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000m%26ps...35..689n&link_type=abstract
Meteoritics & Planetary Science, vol. 35, no. 4, pp. 689-698 (2000).
Mathematics
Logic
29
Scientific paper
Oxygen isotope compositions were determined for a suite of enstatite chondrites and aubrites. In agreement with previous work (Clayton et al. 1984), most samples have oxygen isotope compositions close to the terrestrial fractionation line (TFL), and there appear to be no significant differences in oxygen isotope compositions between individual EH and EL chondrites and aubrites. Five enstatite meteorites have oxygen isotope compositions that are significantly different from the other samples and >0.2 deg away from the TFL. Two of these have petrographic evidence of brecciation and interaction between other meteorite types; for the other three, similar scenarios are suggested. There appears to be a systematic increase in ?18O from enstatite chondrites (both EH and EL) of petrologic type 3 to those of type 6. There is also good evidence that the EH meteorites do not fall along a mass fractionation line but along a line slope 0.66. At the present time, detailed understanding of the origin of these oxygen isotope systematics remain elusive but clearly point to a complex accretion history and/or parent body evolution.
Franchi Ian A.
Newton Jonathan
Pillinger Colin T.
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