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    Evolution and classification of acapulcoites and lodranites from a chemical point of view

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    Author
    Patzer, A.
    Hill, D. H.
    Boynton, W. V.
    Issue Date
    2004-01-01
    Keywords
    polymict eucrite
    Dar al Gani 983
    impact breccias
    
    Metadata
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    Citation
    Patzer, A., Hill, D. H., & Boynton, W. V. (2004). Evolution and classification of acapulcoites and lodranites from a chemical point of view. Meteoritics & Planetary Science, 39(1), 61-85.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/655787
    DOI
    10.1111/j.1945-5100.2004.tb00050.x
    Additional Links
    https://meteoritical.org/
    Abstract
    We examined 15 bulk samples of the acapulcoite-lodranite clan for their major, minor, and trace element concentrations using INAA techniques. Among the analyzed meteorites are 2 new acapulcoites (Dhofar [Dho] 290, Thiel Mountains [TIL] 99002) as well as an additional acapulcoite that has been described previously only in very brief form (Graves Nunataks [GRA] 98028). The petrographic attributes of these 3 samples are addressed thoroughly. We also include petrographic information on 2 acapulcoites from Africa: Northwest Africa (NWA) 725 and NWA 1058. In general, our study strongly supports the widely accepted idea that acapulcoites and lodranites evolved through partial melting and melt migration of metal/sulfide phases and plagioclase. Furthermore, we concur with previous researchers that the original bimodal classification scheme for acapulcoites and lodranites proves to be too simple. Based on our data set, we introduce an alternative, extended scheme. With respect to their elemental distribution patterns, we distinguish 5 subtypes comprising primitive, typical, transitional, and enriched acapulcoites on one hand and lodranites on the other. The chemical distinction between the primitive, typical, and transitional acapulcoites is rather subtle and gradual. It stands in contrast to the clear modifications observed for the signatures of the enriched acapulcoites and the lodranites. The definition of subcategories basically reflects the concentrations of 2 key elements: K and Se. We note, however, that the assignment of subgroups may not be exclusively inferred from elemental abundances but should also consider additional petrographic information.
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2004.tb00050.x
    Scopus Count
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    Meteoritics & Planetary Science, Volume 39, Number 1 (2004)

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