Curtin University Homepage
  • Library
  • Help
    • Admin

    espace - Curtin’s institutional repository

    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item

    Reclassifcation of Villalbeto de la Pena—Occurrence of a winonaite-related fragment in a hydrothermally metamorphosed polymict L-chondritic breccia

    Access Status
    Open access via publisher
    Authors
    Bischoff, A.
    Dyl, Kathryn
    Horstmann, M.
    Ziegler, K.
    Wimmer, K.
    Young, E.
    Date
    2013
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Bischoff, Addi and Dyl, Kathryn A. and Horstmann, Marian and Ziegler, Karen and Wimmer, Karl and Young, Edward D. 2013. Reclassifcation of Villalbeto de la Pena—Occurrence of a winonaite-related fragment in a hydrothermally metamorphosed polymict L-chondritic breccia. Meteoritics and Planetary Science. 48 (4): pp. 628-640.
    Source Title
    Meteoritics and Planetary Science
    DOI
    10.1111/maps.12076
    ISSN
    1086-9379
    URI
    http://hdl.handle.net/20.500.11937/37879
    Collection
    • Curtin Research Publications
    Abstract

    The Villalbeto de la Peña meteorite that fell in 2004 in Spain was originally classified as a moderately shocked L6 ordinary chondrite. The recognition of fragments within the Villalbeto de la Peña meteorite clearly bears consequences for the previous classification of the rock. The oxygen isotope data clearly show that an exotic eye-catching, black, and plagioclase-(maskelynite)-rich clast is not of L chondrite heritage. Villalbeto de la Peña is, consequently, reclassified as a polymict chondritic breccia. The oxygen isotope data of the clast are more closely related to data for the winonaite Tierra Blanca and the anomalous silicate-bearing iron meteorite LEW 86211 than to the ordinary chondrite groups. The REE-pattern of the bulk inclusion indicates genetic similarities to those of differentiated rocks and their minerals (e.g., lunar anorthosites, eucritic, and winonaitic plagioclases) and points to an igneous origin. The An-content of the plagioclase within the inclusion is increasing from the fragment/host meteorite boundary (approximately An10) toward the interior of the clast (approximately An52). This is accompanied by a successive compositionally controlled transformation of plagioclase into maskelynite by shock. As found for plagioclase, compositions of individual spinels enclosed in plagioclase (maskelynite) also vary from the border toward the interior of the inclusion. In addition, huge variations in oxygen isotope composition were found correlating with distance into the object. The chemical and isotopical profiles observed in the fragment indicate postaccretionary metamorphism under the presence of a volatile phase.

    Related items

    Showing items related by title, author, creator and subject.

    • Oxygen isotope variation in primitive achondrites: The influence of primordial, asteroidal, and terrestrial processess
      Greenwood, R.; Franchi, I.; Gibson, J.; Benedix, Gretchen (2012)
      A detailed oxygen isotope study of the acapulcoites, lodranites, winonaites, brachinites and various related achondrites has been undertaken to investigate the nature of their precursor materials. High levels of terrestrial ...
    • The isotopic composition of Zn in natural materials
      Ghidan, Osama Yousef Ali (2008)
      This work represents the most recent development of Zn isotopic measurements, and the first identification of Zn isotopic fractionation in natural materials using Thermal Ionisation Mass Spectrometry (TIMS). The procedures ...
    • 40Ar/39Ar thermochronology of the fossil LL6- chondrite from Morokweng Crater, South Africa
      Jourdan, Fred; Andreoli, M.; McDonald, I.; Maier, W. (2010)
      Studies of meteorites are based mostly on samples that fell to Earth in the recent past (i.e., a few million years at most). The Morokweng LL-chondrite meteorite is a particularly interesting specimen as its fall is much ...
    Advanced search

    Browse

    Communities & CollectionsIssue DateAuthorTitleSubjectDocument TypeThis CollectionIssue DateAuthorTitleSubjectDocument Type

    My Account

    Admin

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Follow Curtin

    • 
    • 
    • 
    • 
    • 

    CRICOS Provider Code: 00301JABN: 99 143 842 569TEQSA: PRV12158

    Copyright | Disclaimer | Privacy statement | Accessibility

    Curtin would like to pay respect to the Aboriginal and Torres Strait Islander members of our community by acknowledging the traditional owners of the land on which the Perth campus is located, the Whadjuk people of the Nyungar Nation; and on our Kalgoorlie campus, the Wongutha people of the North-Eastern Goldfields.