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• W112258909 abstract "Introduction: Enstatite chondrites formed in a very reducing environment and consist predominantly of FeO-free enstatite, with varying amounts of Fe,Ni metal and troilite [1]. Elements which are normally lithophile under more oxidising conditions occur in chalcophile or siderophile associations, giving rise to a variety of rare minerals. A number of models for the formation of enstatite chondrites have been proposed. One theory holds that both EH and EL chondrites formed on a single stratified parent body [2,3]. The alternative scenario is that EH and EL chondrites formed in separate parent bodies [e.g. 4-5]. Rationale: Iron is a moderately volatile element with a 50% condensation temperature of 1334K [6] and the isotopes of iron may be fractionated during high temperature solar nebula processing [e.g. 7]. Zinc is more volatile than iron with a 50% condensation temperature of 726K [6]. We examine the accretion and parent body history of the enstatite chondrites within the framework of Feand Zn-isotopes. Method: The method for analysing Feand Znisotopes by multiple collector inductively coupled plasma mass spectrometry has been described previously [8,9]. The precision at the 2σ level achieved for iron is δFe ± 0.06 permil and δFe ± 0.08 permil with respect to IRMM-014 and for zinc is δZn ± 0.05 permil and δZn ± 0.07 permil with respect to IMP-Zn. Samples: The following enstatite chondrites were analysed: Abee (EH,EH4-5), Kota-Kota (EH3), Indarch (EH4), St. Marks (EH5), Happy Canyon (EL/EL6), Atlanta (EL6), Hvittis (EL6), Khairpur (EL6) and Yilmia (EL6). The isotopic composition of Happy Canyon, which is an impact melt [1], may have been altered by terrestrial residence (discussed below). Results – Fe-Isotopes: Iron isotopes display a fractionation of between 0.11 and 0.19 permil/amu (Figure 1). EL6 chondrites show no significant range in fractionation and the average value is –0.35 permil. EH chondrites (excluding Happy Canyon) show an average δFe of -0.24. The minimum difference between the EH and EL6 groups is 0.08 permil, which is greater than the error range for these measurements. Thus, EL6 chondrites (excluding Happy Canyon) are lighter than EH chondrites. Results – Zn-Isotopes: Zn-isotopes are fractionated between 0.54 to 3.42 permil/amu (Figure 2). The range of δZn = 5.76 permil. EL6 chondrites (Atlanta, Hvittis, Khairpur and Yilmia) are fractionated between 2.67 to 3.42 permil/amu. St. Marks (EH5) is fractionated by 1.74 permil/amu. Happy Canyon (EL6, see below) is fractionated by 0.96 permil/amu. Abee (EH4-5), Kota-Kota (EH3) and Indarch (EH4) are fractionated by between 0.24 and 0.61 permil/amu. The isotopic composition of Abee and Indarch overlap within error, but the isotopic composition of Kota-Kota is heavier." @default.
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• W112258909 date "2005-03-01" @default.
• W112258909 modified "2023-09-26" @default.
• W112258909 title "Enstatite Chondrites: An Iron and Zinc Isotope Study" @default.
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