Computer Science
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48.2651j&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 48, Dec. 1984, p. 2651-2658. Research supported by the Swiss National Sci
Computer Science
22
Abundance, Allende Meteorite, Calcium Isotopes, Meteoritic Composition, Anomalies, Inclusions, Interstellar Matter, Nuclear Fusion, Solar Corona, Stellar Envelopes
Scientific paper
Ca-isotope measurements of Allende Ca-Al-rich inclusions (CAIs), together with those on an apatite-enriched fraction from Orgueil, indicate the existence of widespread excesses on the neutron-rich isotope Ca-48. Isotopic anomalies are noted in 7 out of 11 CAIs analyzed. This abundance of isotopic excesses places Ca alongside Ti and O, although no clear correlation has yet been found between Ca-48 and Ti-50, which are thought to be coproduced by neutron-rich nucleosynthetic processes within stars. It is suggested that the higher volatility of Ca, by comparison with Ti compounds, led to a variable dilution with isotopically normal Ca in vaporization and recondensation processes in stellar envelopes, the interstellar medium, and/or the solar nebula.
Jungck H. A. M.
Lugmair Guenter W.
Shimamura Tadashi
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