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    Bulk Mg isotopic compositions of Ca-Al-rich inclusions and amoeboid olivine aggregates

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    Author
    Wang, G.
    Lin, Y.
    Dai, D.
    Issue Date
    2007-01-01
    Keywords
    extinct radionuclides
    Calcium-aluminum-rich inclusions (CAIs)
    isotope fractionations
    nebula
    
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    Citation
    Wang, G., Lin, Y., & Dai, D. (2007). Bulk Mg isotopic compositions of Ca‐Al‐rich inclusions and amoeboid olivine aggregates. Meteoritics & Planetary Science, 42(7-8), 1281-1289.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/656305
    DOI
    10.1111/j.1945-5100.2007.tb00574.x
    Additional Links
    https://meteoritical.org/
    Abstract
    High-precision Mg isotopic compositions of Ca-Al-rich inclusions (CAIs) from both Ningqiang (ungrouped) and Allende (CV3) carbonaceous chondrites and amoeboid olivine aggregations (AOAs) from Allende were analyzed by multicollector inductively coupled plasma mass spectrometry (MC-ICP-MS). The CAIs from Allende plot on a line, with an inferred initial 26Al/ 27Al ratio of (4.77 +/- 0.39) 10^(-5) close to the canonical value. This indicates a relatively closed Al-Mg system in the CAIs and no significant Mg isotope exchange with ambient materials, although two of the CAIs are severely altered. The AOAs contain excess 26Mg and plot close to the CAI regression line, which is suggestive of their contemporary formation. The CAIs from Ningqiang define a different line with a lower inferred (26Al/27Al)0 ratio of (3.56 +/- 0.08) 10^(-5). None of the CAIs and AOAs studied in this work shows significant mass fractionation with enrichment of the heavier Mg isotopes, arguing against an evaporation origin.
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2007.tb00574.x
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    Meteoritics & Planetary Science, Volume 42, Number 7-8 (2007)

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