Presolar silicon carbide from the Indarch (EH4) meteorite

Comparison with silicon carbide populations from other meteorite classes

Sara S. Russell, Ulrich Ott, Conel M O D Alexander, Ernst K. Zinner, John W. Arden, C. T. Pillinger

Research output: Contribution to journalArticle

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Abstract

Presolar SiC from the Indarch (EH4) meteorite was studied by scanning electron microscopy (SEM), by ion probe analysis for C and Si isotopic compositions, and by static-source mass spectrometry for noble gas and C isotopic compositions. The data obtained are compared to SiC data from other meteorites, especially from Murchison (CM2), for which there is the most information available. The isotopic compositions of the major elements in SiC from Indarch and Murchison are similar. Stepped combustion data suggest a mean δ13C for SiC from both meteorites of ∼+1430‰. Silicon isotopes in Indarch and Murchison SiC also compare well. In some other important respects, however, SiC in the two meteorites are different. Morphologically, SiC from Indarch appears finer grained than SiC from Murchison and is entirely composed of submicron grains. The finer-grained nature of Indarch SiC is confirmed by its noble gas characteristics. The mean Ne-E/ Xe-S ratio for bulk Indarch SiC is significantly lower than the same ratio in Murchison (625 ± 47 vs. ∼3500) but is similar to that of the finest grain-size fractions (

Original languageEnglish
Pages (from-to)719-732
Number of pages14
JournalMeteoritics and Planetary Science
Volume32
Issue number5
Publication statusPublished - Sep 1997

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meteorites
silicon carbides
meteorite
silicon
isotopic composition
noble gas
rare gases
silicon isotopes
ion probes
mass spectroscopy
grain size
mass spectrometry
combustion
scanning electron microscopy
probe
isotope
comparison
ion

ASJC Scopus subject areas

  • Geophysics

Cite this

Russell, S. S., Ott, U., Alexander, C. M. O. D., Zinner, E. K., Arden, J. W., & Pillinger, C. T. (1997). Presolar silicon carbide from the Indarch (EH4) meteorite: Comparison with silicon carbide populations from other meteorite classes. Meteoritics and Planetary Science, 32(5), 719-732.

Presolar silicon carbide from the Indarch (EH4) meteorite : Comparison with silicon carbide populations from other meteorite classes. / Russell, Sara S.; Ott, Ulrich; Alexander, Conel M O D; Zinner, Ernst K.; Arden, John W.; Pillinger, C. T.

In: Meteoritics and Planetary Science, Vol. 32, No. 5, 09.1997, p. 719-732.

Research output: Contribution to journalArticle

Russell, Sara S. ; Ott, Ulrich ; Alexander, Conel M O D ; Zinner, Ernst K. ; Arden, John W. ; Pillinger, C. T. / Presolar silicon carbide from the Indarch (EH4) meteorite : Comparison with silicon carbide populations from other meteorite classes. In: Meteoritics and Planetary Science. 1997 ; Vol. 32, No. 5. pp. 719-732.
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