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Isotopic composition of silicon in meteorites |
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| Authors: | Carol Molinivelsko Toshiko K Mayeda Robert N Clayton |
| Institution: | a Department of Chemistry, The University of Chicago, Chicago, IL 60637, U.S.A. b The Enrico Fermi Institute, The University of Chicago, Chicago, IL 60637, U.S.A. c Department of Geophysical Sciences, The University of Chicago, Chicago, IL 60637, U.S.A. |
| Abstract: | Samples of bulk meteorites show only mass-dependent fractionation of silicon isotopes. No isotopic anomalies were found. The variation of the ratios 29Si/28Si and 30Si/28Si over the meteorite classes is small; 1%. per mass unit difference. The average Si isotopic composition for each class of meteorites is identical, within analytical uncertainties. This is quite unlike O, whose anomalous isotopic abundances in bulk samples differentiate among the classes of meteorites. The overlapping abundance ranges of Si isotopes among many classes of meteorites suggest closed-system behavior for this element prior to meteorite accretion and allow calculation of an average solar system Si isotope composition. |
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