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- W1627048837 abstract "Introduction: Presolar graphite grains extracted from the Murchison meteorite have a range of density (1.6–2.2g/cm) [1]. Low-density graphite grains (1.65-1.72g/cm) are larger (up to 20mm) and have higher trace element concentrations than higher-density graphite grains. Consequently, the former have been well studied and isotopic ratios of the grains analyzed with ion probe indicate that they formed in supernovae [2, 3]. In contrast, only few isotopic analyses of trace elements in grains from the second highest density fraction KFB1 (2.10–2.15g/cm) exist. In this study, we measured N and Si isotopic ratios of 170 KFB1 grains in multi-detection mode with the NanoSIMS at Washington University. Carbon and O isotopic ratios of these grains had previously been analyzed [4]. Results and Discussion: Of 7 grains with O excesses (solid circles in Fig. 1), five show Si excesses, grain 061 a moderate Si excess and Si deficit, and grain 636 Si and Si excesses. These Si isotopic features, together with the O excesses, are indicative of the grains’ supernova origin [2, 3]. Twenty-two grains (squares) have dSi values higher than 50‰ and C/C ratios between 122 and 1531. Their Si excesses are much more pronounced than their Si excesses, suggesting that the grains formed in low-metallicity asymptotic giant branch (AGB) stars. Similar Si isotopic features are also observed in high-density graphite separates (2.022.12g/cm) from the Orgueil meteorite [5]. Grains from KFB1 show two distinct populations: grains with C/C 20, with median ratios of 10 and 308, respectively. Many of the latter grains, namely those with C/C > 100, most likely formed in lowmetallicity AGB stars as discussed above. The origin of the former, however, remains enigmatic. In contrast to their C/C ratios, their O/O and Si isotopic ratios are normal within errors." @default.
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- W1627048837 date "2005-09-01" @default.
- W1627048837 modified "2023-09-23" @default.
- W1627048837 title "Isotopic Analysis of Presolar Graphite from the KFB1 Murchison Separate" @default.
- W1627048837 hasPublicationYear "2005" @default.
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