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    The gentle separation of presolar SiC grains from meteorites

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    Author
    Tizard, J.
    Lyon, I.
    Henkel, T.
    Issue Date
    2005-01-01
    Keywords
    presolar grains
    separation
    Silicon carbide
    
    Metadata
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    Citation
    Tizard, J., Lyon, I., & Henkel, T. (2005). The gentle separation of presolar SiC grains from meteorites. Meteoritics & Planetary Science, 40(3), 335-342.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/655972
    DOI
    10.1111/j.1945-5100.2005.tb00386.x
    Additional Links
    https://meteoritical.org/
    Abstract
    This paper describes the development of a new, effective, and non-destructive method of SiC isolation from meteorites by freeze-thaw disaggregation, size, and density separation. This new method is important because there is evidence that current methods, which use strong acids and chemical treatments to dissolve silicates and separate out the interstellar grains, may alter the surfaces of the grains chemically and isotopically. Furthermore, any non-refractory coating present on the grains would be destroyed. Using our new separation method, SiC grains were enriched from ~6 ppm abundance in Murchison whole rock to 0.67% abundance in the 0.4-1.4 micrometer size range and 0.27% abundance in the 1.4-17 micrometer size range. Individual SiC grains were easily identified using electron probe microanalysis (EPMA) mapping of grains distributed thinly on gold foil; a small aliquot from these fractions has so far yielded >150 SiC grains for isotopic analysis. The method separates out SiC grains efficiently, is applicable to very small or rare samples, and avoids the harsh acid treatments that may alter possible amorphous or non-refractory coats on the grains. The procedure also preserves the remainder of the original sample and it is hoped that it may be extended to other micron-sized presolar grains found in meteorites such as corundum, graphite, and silicon nitride.
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2005.tb00386.x
    Scopus Count
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    Meteoritics & Planetary Science, Volume 40, Number 3 (2005)

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