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    The formation of IIE iron meteorites investigated by the chondrule-bearing Mont Dieu meteorite

    Access Status
    Fulltext not available
    Authors
    Van Roosbroek, N.
    Debaille, V.
    Pittarello, L.
    Goderis, S.
    Humayun, M.
    Hecht, L.
    Jourdan, Fred
    Spicuzza, M.
    Vanhaecke, F.
    Claeys, P.
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Van Roosbroek, N. and Debaille, V. and Pittarello, L. and Goderis, S. and Humayun, M. and Hecht, L. and Jourdan, F. et al. 2015. The formation of IIE iron meteorites investigated by the chondrule-bearing Mont Dieu meteorite. Meteoritics and Planetary Science. 50 (7): pp. 1173-1196.
    Source Title
    Meteoritics and Planetary Science
    DOI
    10.1111/maps.12463
    ISSN
    1086-9379
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/59603
    Collection
    • Curtin Research Publications
    Abstract

    A 435kg piece of the Mont Dieu iron meteorite (MD) contains cm-sized silicate inclusions. Based on the concentration of Ni, Ga, Ge, and Ir (8.59±0.32 wt%, 25.4±0.9ppm, 61±2ppm, 7.1±0.4ppm, respectively) in the metal host, this piece can be classified as a IIE nonmagmatic iron. The silicate inclusions possess a chondritic mineralogy and relict chondrules occur throughout the inclusions. Major element analysis, oxygen isotopic analysis (? 17 O=0.71±0.02‰), and mean Fa and Fs molar contents (Fa 15.7±0.4 and Fs 14.4±0.5 ) indicate that MD originated as an H chondrite. Because of strong similarities with Netschaëvo IIE, MD can be classified in the most primitive subgroup of the IIE sequence. 40 Ar/ 39 Ar ages of 4536±59Ma and 4494±95Ma obtained on pyroxene and plagioclase inclusions show that MD belongs to the old (~4.5Ga) group of IIE iron meteorites and that it has not been perturbed by any subsequent heating event following its formation. The primitive character of MD sheds light on the nature of its formation process, its thermal history, and the evolution of its parent body.

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