The Mg isotope composition of presolar silicate grains from red giant stars

Janos Kodolanyi, Peter Hoppe, Elmar Groener, Christoph Pauly, Franz Muecklich

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We report O and Mg isotope compositions of presolar silicate grains which likely formed around asymptotic giant branch stars. Our grains represent the most abundant Mg-rich presolar grain group and their Mg isotope composition provides thus far missing information about the contribution of isotopically anomalous presolar dust to the Mg isotope inventory of the early Solar System. Presolar silicate grains were identified in situ, using the NanoSIMS, in the matrix of the ungrouped carbonaceous chondrite Acfer 094. O isotope compositions suggest that the presolar grains of the present study formed in the stellar winds of low mass (M 6 2.2 Msolar) red giant or asymptotic giant branch stars of close-to-solar metallicity and thus belong to the most abundant presolar silicate grain group.
Original languageEnglish
Pages (from-to)577-605
Number of pages29
JournalGeochimica et Cosmochimica Acta
Volume140
Publication statusPublished - 2014

Keywords

  • Solar system
  • Super Nova
  • Extinct isotopes

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