Search for isotopic anomalies in oldhamite (CaS) from unequilibrated (E3) enstatite chondrites

Details Search for isotopic anomalies in oldhamite (CaS) from unequilibrated (E3) enstatite chondrites Search for isotopic anomalies in oldhamite (CaS) from unequilibrated (E3) enstatite chondrites

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29..384l&link_type=abstract

Meteoritics, vol. 29, no. 3, p. 384-393

Computer Science

4

Calcium Isotopes, Chemical Analysis, Chondrites, Enstatite, Mass Spectroscopy, Meteoritic Composition, Mineralogy, Solar System Evolution, Sulfur Compounds, Anomalies, Correlation, Fractionation, Graphs (Charts), Tables (Data)

Scientific paper

The Ca isotopic compositions of 32 oldhamite (CaS) grains from the Qingzhen (EH3), MAC88136 (EL3), and Indarch (EH4) enstatite chondrites were determined by ion microprobe mass spectrometry. Also measured were the S isotopic compositions of eight oldhamite, two niningerite (MgS), and seven troilite (FeS) grains. The S isotopic compositions of all minerals are normal, but oldhamite grains of the first two meteorites exhibit apparent small Ca-48 excesses and deficits that are correlated with isotopic mass fractionation as determined from the Ca-40-Ca-44 pair. The interpretation of these results is complicated by the fact that none of the established mass fractionation laws can account for the data in the Norton County oldhamite standard. The method of analysis is carefully scrutinized for experimental artifacts. Neither interferences nor any known mass frationation effect can satisfactorily explain the observed small deviations from normal isotopic composition. If these are truly isotopic anomalies, they are much smaller than those observed in hibonite. The nucleosynthetic origin of Ca isotopes is discussed.

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