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    Petrology and chemistry of the basaltic shergottite North West Africa 480

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    Author
    Barrat, J. A.
    Gillet, Ph.
    Sautter, V.
    Jambon, A.
    Javoy, M.
    Göpel, C.
    Lesourd, M.
    Keller, F.
    Petit, E.
    Issue Date
    2002-01-01
    Keywords
    petrology
    geochemistry
    HED meteorites
    
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    Citation
    Barrat, J. A., Gillet, P., Sautter, V., Jambon, A., Javoy, M., Göpel, C., ... & Petit, E. (2002). Petrology and chemistry of the basaltic shergottite North West Africa 480. Meteoritics & Planetary Science, 37(4), 487-499.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/655499
    DOI
    10.1111/j.1945-5100.2002.tb00835.x
    Additional Links
    https://meteoritical.org/
    Abstract
    North West Africa (NWA) 480 is a new martian meteorite of 28 g found in the Moroccan Sahara in November 2000. It consists mainly of large gray pyroxene crystals (the largest grains are up to 5 mm in length) and plagioclase converted to maskelynite. Excluding the melt pocket areas, modal analyses indicate the following mineral proportions: 72 vol% pyroxenes extensively zoned, 25% maskelynite, 1% phosphates (merrillite and chlorapatite), 1% opaque oxides (ilmenite, ulvospinel and chromite) and sulfides, and 1% others such as silica and fayalite. The compositional trend of NWA 480 pyroxenes is similar to that of Queen Alexandra Range (QUE) 94201 but in NWA 480 the pyroxene cores are more Mg-rich (En77-En65). Maskelynites display a limited zoning (An42-50Ab54-48Or2-4). Our observations suggest that NWA 480 formed from a melt with a low nuclei density at a slow cooling rate. The texture was achieved via a single-stage cooling where pyroxenes grew continuously. A similar model was previously proposed for QUE 94201 by McSween et al. (1996). NWA 480 is an Al-poor ferroan basaltic rock and resembles Zagami or Shergotty for major elements and compatible trace element abundances. The bulk rock analysis for oxygen isotopes yields Delta-17O = +0.42 ppm, a value in agreement at the high margin, with those measured on other shergottites (Clayton and Mayeda, 1996; Romanek et al., 1998; Franchi et al., 1999). Its CI-normalized rare earth element pattern is similar to those of peridotitic shergottites such as Allan Hills (ALH)A77005, suggesting that these shergottites shared a similar parent liquid, or at least the same mantle source.
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2002.tb00835.x
    Scopus Count
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    Meteoritics & Planetary Science, Volume 37, Number 4 (2002)

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