Nucleosynthetic zirconium isotope anomalies in acid leachates of carbonaceous chondrites |
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Authors: | Maria Schö nbä chler,Mark Rehkä mper,Manuela A. Fehr,Alex N. Halliday,Bodo Hattendorf |
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Affiliation: | 1 ETH Zürich, Institute of Isotope Geology and Mineral Resources, 8092 Zürich, Switzerland 2 DTM, Carnegie Institution of Washington, 5241 Broad Branch Road NW, Washington, DC 20015, USA 3 Department of Earth Science and Engineering, Imperial College, London, SW7 2AZ, United Kingdom 4 Swedish Museum for Natural History, Laboratory for Isotope Geology, 104 05 Stockholm, Sweden 5 Department of Earth Sciences, University of Oxford, Parks Road, Oxford, OX1 3PR, United Kingdom 6 ETH Zürich, Laboratory of Inorganic Chemistry, 8093 Zürich, Switzerland |
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Abstract: | Stepwise dissolutions of the carbonaceous chondrites Orgueil (CI), Murchison (CM) and Allende (CV) reveal large nucleosynthetic anomalies for Zr isotopes that contrast with the uniform compositions found in bulk meteorites. Two complementary nucleosynthetic components are observed: one enriched and one depleted in s-process nuclides. The latter component, characterized by excess 96Zr, is most distinctive in the acetic acid leachate (up to ε96Zr ≈ 50). The excess decreases with increasing acid strength and the final leaching steps of the experiment are depleted in 96Zr and thus enriched in s-process nuclides. Presolar silicon carbide grains are likely host phases for part of the anomalous Zr released during these later stages. However, by mass balance they cannot account for the 96Zr excesses observed in the early leaching steps and this therefore hints at the presence of at least one additional carrier phase with significant amounts of anomalous Zr. The data provide evidence that average solar system material consists of a homogenized mixture of different nucleosynthetic components, which can be partly resolved by leaching experiments of carbonaceous chondrites. |
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