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    40Ar/39Ar age of Mendanha Alkaline Intrusion, Rio de Janeiro, Brazil

    Access Status
    Fulltext not available
    Authors
    Mota, C.
    Geraldes, M.
    Jourdan, Fred
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Mota, C. and Geraldes, M. and Jourdan, F. 2014. 40Ar/39Ar age of Mendanha Alkaline Intrusion, Rio de Janeiro, Brazil. Comunicacoes Geologicas. 101 (S1): pp. 157-161.
    Source Title
    Comunicacoes Geologicas
    Additional URLs
    http://www.lneg.pt/download/9527/29_3037_ART_CG14_ESPECIAL_I.pdf
    ISSN
    0873-948X
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/44635
    Collection
    • Curtin Research Publications
    Abstract

    The Mendanha Alkaline Intrusion is one of many alkaline occurences of the Southeastern Brazil Alkaline Province. It comprises plutonic rocks (alkali-syenites and syenites) and hypabyssal types (trachytes and ignibrites). In this work is presented new 40 Ar/ 39 Ar ages for this massif. The last reported ages were about 74 My and 65 My by K/Ar method published in 1988. The obtained results show ages of about 64 My (64.12 ± 0.40, 64.04 ± 0.42) e 58 My (58.55 ± 0.45, 57.95 ± 0.69), which are correlated to neighbour magmatic intrusions.

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