Iron and Nickel Isotopes in IID and IVB Iron Meteorites: Evidence for Admixture of an SN II Component and Implications for the Initial Abundance of 60Fe
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Date
2021-08-17Type
- Journal Article
Abstract
We measured Fe and Ni isotopes in 13 iron meteorites from magmatic groups IID and IVB. Resolvable deficits (approximate to-0.14) are observed in epsilon Ni-60 in both groups. Small deficits (approximate to-0.08) are also evident in epsilon Fe-56 but not in the most neutron-rich isotope of Fe (Fe-58). Relative to terrestrial material, the observed epsilon Fe-i values are consistent with the presence of a small excesses of material in the parent bodies of IID and IVB irons that was produced in a type II supernova. The epsilon Ni-60 and epsilon Fe-56 values are uncorrelated in both groups. This is consistent with a nucleosynthetic origin of the epsilon Fe-56 deficits, whereas the epsilon Ni-60 deficits are best explained as radiogenic in nature due to the former presence of live Fe-60 (t (1/2) = 2.62 Ma) in the early solar system. The Ni-60 deficits correspond to Fe-60/Fe-56 ratios of approximate to 3 x 10(-7) at the time of core formation on the IID and IVB parent bodies. These data, in conjunction with previously published Hf-182-W-182 core formation ages, are used to estimate a solar system initial Fe-60/Fe-56 = (6.4 +/- 2.0) x 10(-7) for the formation region of carbonaceous chondrites. Show more
Publication status
publishedExternal links
Journal / series
The Astrophysical JournalVolume
Pages / Article No.
Publisher
IOP PublishingOrganisational unit
03946 - Schönbächler, Maria / Schönbächler, Maria
Funding
149282 - Probing the origin of the Moon with non-traditional stable isotopes (SNF)
279779 - Accretion and Differentiation of Terrestrial Planets (EC)
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