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Title:
Evidence for live 60Fe in meteorites
Authors:
Mostefaoui, S.; Lugmair, G. W.; Hoppe, P.; El Goresy, A.
Affiliation:
AA(Cosmochemistry Department, Max-Planck-Institut für Chemie, Postfach 3060, Mainz D-55020, Germany ), AB(Cosmochemistry Department, Max-Planck-Institut für Chemie, Postfach 3060, Mainz D-55020, Germany ), AC(Cosmochemistry Department, Max-Planck-Institut für Chemie, Postfach 3060, Mainz D-55020, Germany ), AD(Cosmochemistry Department, Max-Planck-Institut für Chemie, Postfach 3060, Mainz D-55020, Germany )
Publication:
New Astronomy Reviews, Volume 48, Issue 1-4, p. 155-159. (NewAR Homepage)
Publication Date:
02/2004
Origin:
ELSEVIER
Abstract Copyright:
(c) 2003 Elsevier B.V.
DOI:
10.1016/j.newar.2003.11.022
Bibliographic Code:
2004NewAR..48..155M

Abstract

We report a preliminary in situ finding of 60Ni isotopic anomalies, attributed to the decay of short-lived 60Fe (half-life 1.5 Ma), in Fe-sulfides and pyroxene in the Chervony Kut eucrite and in the Semarkona (LL3.0) ordinary chondrite using the new state-of-the-art NanoSIMS technique at MPI in Mainz. In Semarkona, troilites (FeS) show 60Ni excesses of up to 46 ± 15‰ (2σ). A positive correlation between 60Ni excesses and 56Fe/ 58Ni ratios provides evidence for live 60Fe in the early solar system. The inferred 60Fe/ 56Fe ratio of (7.3 ± 2.6) × 10 -7 is much higher than previously estimated for the initial solar system value. In terms of a chronological interpretation, this corresponds to one half-life of 60Fe. In Chervony Kut, two pyrrhotite {Fe (1-x)S} types (abundant Pyr-1 crystals and rare Pyr-2 veins) and pyroxene {(Mg,Fe)SiO 3} grains show 60Ni excesses. The delta- 60Ni varies from 22 ± 16‰ (2σ) in Pyr-1 to an extremely high value of 1775 ± 250‰ in Pyr-2 veins. No clear correlation is seen between the 60Ni excess and the Fe/Ni ratio, which does not allow a plausible explanation for the extreme excess encountered in Pyr-2. More meticulous analyses are underway in order to confirm this preliminary finding.
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