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    A TEM study of thermally modified comet 81P/Wild 2 dust particles by interactions with the aerogel matrix during the Stardust capture process

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    Author
    Leroux, H.
    Rietmeijer, F. J. M.
    Velbel, M. A.
    Brearley, A. J.
    Jacob, D.
    Langenhorst, F.
    Bridges, J. C.
    Zega, T. J.
    Stroud, R. M.
    Cordier, P.
    Harvey, R. P.
    Lee, M.
    Gounelle, M.
    Zolensky, M. E.
    Show allShow less
    Issue Date
    2008-01-01
    Keywords
    cometary dust
    TEM
    silicate melt
    impact melting
    
    Metadata
    Show full item record
    Citation
    Leroux, H., Rietmeijer, F. J., Velbel, M. A., Brearley, A. J., Jacob, D., Langenhorst, F., ... & Zolensky, M. E. (2008). A TEM study of thermally modified comet 81P/Wild 2 dust particles by interactions with the aerogel matrix during the Stardust capture process. Meteoritics & Planetary Science, 43(1‐2), 97-120.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/656384
    DOI
    10.1111/j.1945-5100.2008.tb00612.x
    Additional Links
    https://meteoritical.org/
    Abstract
    We report the results of high-resolution, analytical and scanning transmission electron microscopy (STEM), including intensive element mapping, of severely thermally modified dust from comet 81P/Wild 2 caught in the silica aerogel capture cells of the Stardust mission. Thermal interactions during capture caused widespread melting of cometary silicates, Fe-Ni-S phases, and the aerogel. The characteristic assemblage of thermally modified material consists of a vesicular, silica-rich glass matrix with abundant Fe-Ni-S droplets, the latter of which exhibit a distinct core-mantle structure with a metallic Fe,Ni core and a iron-sulfide rim. Within the glassy matrix, the elemental distribution is highly heterogeneous. Localized amorphous dust-rich patches contain Mg, Al, and Ca in higher abundances and suggest incomplete mixing of silicate progenitors with molten aerogel. In some cases, the element distribution within these patches seems to depict the outlines of ghost mineral assemblages, allowing the reconstruction of the original mineralogy. A few crystalline silicates survived with alteration limited to the grain rims. The Fe- and CI-normalized bulk composition derived from several sections show CI-chondrite relative abundances for Mg, Al, S, Ca, Cr, Mn, Fe, and Ni. The data indicate a 5 to 15% admixture of fine-grained chondritic comet dust with the silica glass matrix. These strongly thermally modified samples could have originated from a finegrained primitive material, loosely bound Wild 2 dust aggregates, which were heated and melted more efficiently than the relatively coarse-grained material of the crystalline particles found elsewhere in many of the same Stardust aerogel tracks (Zolensky et al. 2006).
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2008.tb00612.x
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    Meteoritics & Planetary Science, Volume 43, Number 1-2 (2008)

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