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    Ibitira: A basaltic achondrite from a distinct parent asteroid and implications for the Dawn mission

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    Author
    Mittlefehldt, D. W.
    Issue Date
    2005-01-01
    Keywords
    Dawn mission
    eucrites
    Ibitira
    basaltic achondrites
    
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    Citation
    Mittlefehldt, D. W. (2005). Ibitira: A basaltic achondrite from a distinct parent asteroid and implications for the Dawn mission. Meteoritics & Planetary Science, 40(5), 665-677.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/655995
    DOI
    10.1111/j.1945-5100.2005.tb00972.x
    Additional Links
    https://meteoritical.org/
    Abstract
    I have done a detailed petrologic study of Ibitira, a meteorite that has been classified as a basaltic eucrite since 1957. The mean Fe/Mn ratio of pyroxenes in Ibitira with <10 mole% wollastonite component is 36.4 +/- 0.4; this value is well resolved from those of similar pyroxenes in five basaltic eucrites studied for comparison, which range from 31.2 to 32.2. Data for the latter five eucrites completely overlap. Ibitira pyroxenes have lower Fe/Mg than the basaltic eucrite pyroxenes; thus, the higher Fe/Mn ratio does not reflect a simple difference in oxidation state. Ibitira also has an oxygen isotopic composition, alkali element contents, and a Ti/Hf ratio that distinguish it from basaltic eucrites. These differences support derivation from a distinct parent asteroid. Thus, Ibitira is the first recognized representative of the fifth known asteroidal basaltic crust, the others being the HED, mesosiderite, angrite, and NWA 011 parent asteroids. 4 Vesta is generally assumed to be the HED parent asteroid. The Dawn mission will orbit 4 Vesta and will perform detailed mapping and mineralogical, compositional, and geophysical studies of the asteroid. Ibitira is only subtly different from eucritic basalts. A challenge for the Dawn mission will be to distinguish different basalt types on the surface and to attempt to determine whether 4 Vesta is indeed the HED parent asteroid.
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2005.tb00972.x
    Scopus Count
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    Meteoritics & Planetary Science, Volume 40, Number 5 (2005)

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