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• W2528396073 abstract "Introduction: Stable iron isotope measurements of metal grains from ordinary chondrites have been carried out in order to explore the processes involved with their formation, their early history and subsequent alteration. Metal/silicate fractionation, chondrule formation, metamorphism, aqueous alteration and other processes have probably all influenced the Fe in chondrites. We have analysed the iron isotope ratios of the metallic iron grains of 18 H, L and LL chondrites representing petrographic types 3-6, including falls and finds. Samples and preparation: The samples had been crushed and magnetically separated during an earlier study [1]. Initial analyses were carried out by dissolving (mg) samples of the magnetic separates in 10% HNO3. However, significant amounts of magnesium from intergrown silicates were present which caused matrix effects and also indicated the possible presence of Fe leached from the silicate. Thus, the samples were crushed further under acetone and the iron grains hand picked under a microscope. The samples were once again dissolved in a 10% solution of HNO3 and left to re-flux until fully dissolved. They were then diluted and re-analysed to confirm that the amount of magnesium had been reduced to insignificant levels. Mass Spectrometry: Measurements were made on a Nu Instruments double focusing multiplecollector ICP-MS. The instrument was operated in pseudo high resolution with sample solutions being introduced by a Nu Instruments DSN-100 Desolvating Nebuliser. The nebuliser is designed to minimise isobaric interferences resulting from ArN, ArO and ArOH which interfere with Fe, Fe and Fe respectively. In this way the iron isotopes and the isobaric interferences are sufficiently resolved and appear as a flat topped peak with an iron ‘shoulder’ [2]. Reproducibility and accuracy were determined over a two year period by multiple measurements of an inhouse Johnson-Matthey (JM) iron standard using the sample standard bracketing (SSB) technique and the IRMM014 iron isotope standard (JRC Reference Laboratory for Isotopic Measurements). The results have been calculated using the standard delta notation: δFe = [{(Fe/Fe)sample/(Fe/Fe)IRMM014}-1 *1000]. For the JM standard we found that δFe=0.34±0.03‰ and δFe=0.52±0.04‰, in good agreement with accepted values. Each measurement cycle, including the meteorite samples, consisted of a single block of 30 readings typically repeated 3-6 times and bracketed each time with IRMM014. Quoted uncertainties are to ±1σ. Results: Isotopic data are given in Table 1 where each value is the average and standard deviation of 6 repeat analyses. In addition, some of the samples have been duplicated at different times to assess long-term reproducibility. In this case the result given is the average of the two or more separate measurements and is indicated in the table with an asterisk. The data are plotted in Figures 1-5. Table 1: Isotopic data for iron grains in ordinary chondrites, all values are in ‰ relative to IRMM014." @default.
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• W2528396073 date "2006-09-01" @default.
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• W2528396073 title "Stable isotope analyses of metal grains in ordinary chondrites by MC-ICP-MS" @default.
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