Mathematics – Logic
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007gecoa..71.4082g&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 71, Issue 16, p. 4082-4091.
Mathematics
Logic
13
Scientific paper
In situ measurements of 60Fe 60Ni and 53Mn 53Cr isotopic systems with an ion microprobe have been carried out for sulfide assemblages from unequilibrated enstatite chondrites (UECs). Evidence for the initial presence of 60Fe has been observed in nine sulfide inclusions from three UECs: ALHA77295, MAC88136, and Qingzhen. The inferred initial (60Fe/56Fe) [(60Fe/56Fe)0] ratios show a large variation range, from ˜2 × 10-7 to ˜2 × 10-6. The sulfide inclusions with high Fe/Ni ratios yield (60Fe/56Fe)0 ratios of ˜(2 7) × 10-7, similar to most of the (60Fe/56Fe)0 values of troilite and pyroxene observed in unequilibrated ordinary chondrites (UOCs). Inclusions with high inferred (60Fe/56Fe)0 ratios (˜1 2 × 10-6) have low Fe/Ni ratios and the magnitude of the 60Ni excesses is similar in two MAC88136 assemblages in spite of a difference of a factor of two in their Fe/Ni ratios. The inferred high (60Fe/56Fe)0 ratios were probably the result of Fe Ni re-distribution in the sulfides during later alteration processes. The 53Mn 53Cr system was measured in five of the sulfide assemblages that were examined for their 60Fe 60Ni systematics. The 53Mn 53Cr isochrons yielded variable initial (53Mn/55Mn) [(53Mn/55Mn)0] ratios from ˜(2 7) × 10-7. There is no obvious correlation between the (60Fe/56Fe)0 and (53Mn/55Mn)0 ratios. The variable 53Mn 53Cr isochrons probably also indicate later disturbance to the isotopic systems in these sulfides. Even though no chronological information can be extracted from the 60Fe 60Ni and 53Mn 53Cr systems in these UEC sulfides, our results indicate that 60Fe was present in the enstatite chondrite formation region of the early Solar System.
Guan Yunbin
Huss Gary R.
Leshin Laurie Ann
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