Calcium-aluminum-rich Inclusions in Enstatite Chondrites (II): Oxygen Isotopes

Details Calcium-aluminum-rich Inclusions in Enstatite Chondrites (II): Oxygen Isotopes Calcium-aluminum-rich Inclusions in Enstatite Chondrites (II): Oxygen Isotopes

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001m%26ps...36..223f&link_type=abstract

Meteoritics & Planetary Science, vol. 36, no. 2, p. 223-230

Computer Science

23

Scientific paper

In situ ion microprobe analyses of spinel in refractory calcium-aluminium-rich inclusions (CAIs) from type 3 EH chondrites yield 16O-rich compositions (w18O and w17O about -40%). Spinel and feldspar in a CAI from an EL3 chondrite have significantly heavier isotopic compositions (w18O and w17O about -5%). A regression through the data results in a line with slope 1.0 on a three-isotope plot, similar to isotopic results from unaltered minerals in CAIs from carbonaceous chondrites. The existence of CAIs with 16O-rich and 16O-poor compositions in carbonaceous as well as enstatite chondrites indicates that CAIs formed in at least two temporally or spatially distinct oxygen reservoirs. General similarities in oxygen isotopic compositions of CAIs from enstatite, carbonaceous, and ordinary chondrites indicate a common nebular mechanism or locale for the production of most CAIs.

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