IRON-60 HETEROGENEITY AND INCOMPLETE ISOTOPE MIXING IN THE EARLY SOLAR SYSTEM

Journal Article · Fri Sep 10 00:00:00 EDT 2010 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/720/2/1215· OSTI ID:21460060

Quitte, Ghylaine ^[1]; Markowski, Agnes ^[2]; Latkoczy, Christopher ^[3]; Gabriel, Aron; Pack, Andreas ^[4]

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1. Universite de Lyon (France)
2. ETH Zurich, Institute for Isotope Geology and Mineral Resources, Clausiusstrasse 25, CH-8092 Zurich (Switzerland)
3. ETH Zurich, D-CHAB, Laboratory of Inorganic Chemistry, Wolfgang-Pauli Strasse 10, CH-8093 Zurich (Switzerland)
4. Geowissenschaftliches Zentrum, Universitaet Goettingen, Goldschmidtstrasse 1, D-37077 Goettingen (Germany)

Short-lived radionuclides (e.g., {sup 26}Al, {sup 53}Mn, {sup 60}Fe, {sup 182}Hf) are widely used to refine the chronology of the early solar system. They provide chronological information, however, only if they were homogeneously distributed in the source region of the objects under scrutiny at the time of their formation. With the high level of precision now achieved on isotopic measurements, very short time intervals can in principle be resolved and a precise evaluation of the initial homogeneity degree becomes increasingly crucial. High-precision nickel isotope data for differentiated meteorites (angrites, ureilites) and chondritic (CB) components allow us to test the initial distribution of radioactive {sup 60}Fe and stable Ni isotopes. Although these meteorites appear to have formed nearly contemporaneously, they yield variable initial {sup 60}Fe/{sup 56}Fe ratios. Besides, the CB metal nodules and ureilite silicates show nucleosynthetic anomalies. The new data presented here do not confirm the recently inferred late injection of {sup 60}Fe into the protoplanetary disk. Instead, live {sup 60}Fe was present, but heterogeneously distributed, from the start of the solar system, revealing an incomplete mixing of material from various nucleosynthetic sources and restricting the use of the {sup 60}Fe-{sup 60}Ni system as a chronometer.

• OSTI ID: 21460060
• Journal Information: Astrophysical Journal, Vol. 720, Issue 2; Other Information: DOI: 10.1088/0004-637X/720/2/1215; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ABUNDANCE
ALUMINIUM 26
HAFNIUM 182
IRON 56
IRON 60
MANGANESE 53
METEORITES
METEOROIDS
NICKEL 60
NUCLEAR REACTIONS
NUCLEOSYNTHESIS
PROTOPLANETS
SILICATES
SOLAR SYSTEM
SOLAR SYSTEM EVOLUTION
ALUMINIUM ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
EVEN-EVEN NUCLEI
EVOLUTION
HAFNIUM ISOTOPES
HEAVY NUCLEI
HOURS LIVING RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
IRON ISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LIGHT NUCLEI
MANGANESE ISOTOPES
NICKEL ISOTOPES
NUCLEI
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
OXYGEN COMPOUNDS
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SILICON COMPOUNDS
STABLE ISOTOPES
SYNTHESIS
YEARS LIVING RADIOISOTOPES