Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004newar..48..155m&link_type=abstract
New Astronomy Reviews, Volume 48, Issue 1-4, p. 155-159.
Astronomy and Astrophysics
Astronomy
26
Meteorites, Solar System, Extinct Radionuclides, Isotope Abundance Anomalies, Planetary Differentiation
Scientific paper
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)SiO3} 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.
El Goresy Ahmed
Hoppe Peter
Lugmair Guenter W.
Mostefaoui Smail
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