Ion microprobe studies of a carbonaceous (CM) xenolith in the Erevan howardite

Details Ion microprobe studies of a carbonaceous (CM) xenolith in the Erevan howardite Ion microprobe studies of a carbonaceous (CM) xenolith in the Erevan howardite

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29..526s&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 526-527

Computer Science

Carbonaceous Meteorites, Inclusions, Ion Probes, Meteoritic Composition, Calcium Isotopes, Geomorphology, Phase Transformations, Textures

Scientific paper

The presence of carbonaceous (CM) xenoliths in the Erevan howardite has been reported recently by Nazarov et al. The carbonates present in these clasts occur as rounded aggregates and are fine grained and extremely pure in composition. Although they resemble CAIs in morphology and texture, no relic refractory phases are present in them. These features and the absence of associated secondary phases led Nazarov et al. to propose these carbonates to be of nebular origin even though carbonates are generally not considered to be a stable phase under normal solar nebular conditions. A unique fragment of P-rich sulfide was also found in one of the carbonaceous clasts. A highly nebular environment characterized by high S fugacity was proposed as the formation site of this unique fragment, which was later incorporated into the carbonaceous matrix. We have used the ion microprobe to determine Ca isotopic compositions of several of the carbonate inclusions and S isotopic composition of the P-rich sulfide. We present the results of our Ca isotopic studies. The results obtained from Ca isotopic studies of six carbonate inclusions from the carbonaceous clast that also contain the P-rich sulfide are presented. The Ca isotopic compositions of all the inclusions are normal within the limits of our experimental uncertainties. If these carbonate inclusions were indeed of nebular origin, they have either sampled a nebular reservoir of normal Ca isotopic composition or they have equilibrated with reservoir(s) of normal isotopic composition

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