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    Metamorphic evolution and U-Pb zircon SHRIMP geochronology of the Belizario ultramafic amphibolite, Encantadas Complex, southernmost Brazil.

    136584_19846_56116.pdf (911.2Kb)
    Access Status
    Open access
    Authors
    Hartmann, L.
    Santos, J.
    Leite, J.
    Porcher, C.
    McNaughton, Neal
    Date
    2003
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Hartmann, Leo and Santos, Joao and Leite, Jayme and Porcher, Carla and McNaughton, Neal. 2003. Metamorphic evolution and U-Pb zircon SHRIMP geochronology of the Belizario ultramafic amphibolite, Encantadas Complex, southernmost Brazil. Anais da Academia Beasileira de Ciencias. 75 (3): pp. 393-403.
    Source Title
    Anais da Academia Beasileira de Ciencias
    ISSN
    0001-3765
    Faculty
    Science and Engineering
    School
    John de Laeter Centre for Mass Spectrometry (COE)
    Remarks

    The english title of this journal is Annals of the Brazilian Academy of Sciences

    URI
    http://hdl.handle.net/20.500.11937/19378
    Collection
    • Curtin Research Publications
    Abstract

    The integrated investigation of metamorphism and zircon U-Pb SHRIMP geochronology of the Belizario ultramafic amphibolite from southernmost Brazil leads to a better understanding of the processes involved in the generation of the Encantadas Complex. Magmatic evidence of the magnesian basalt or pyroxenite protolith is only preserved in cores of zircon crystals, which are dated at 2257 ± 12 Ma. Amphibolite facies metamorphism M1 formed voluminous hornblende in the investigated rock possibly at 1989 ± 21 Ma. This ultramafic rock was re-metamorphosed at 702 ± 21 Ma during a greenschist facies event M2; the assemblage actinolite + oligoclase + microcline + epidote + titanite + monazite formed by alteration of hornblende. The metamorphic events are probably related to the Encantadas Orogeny (2257 ± 12 Ma) and Camboriu Orogeny (~ 1989 Ma) of the Trans-Amazonian Cycle, followed by an orogenic event (702 ± 21 Ma) of the Brasiliano Cycle. The intervening cratonic period (2000-700 Ma) corresponds to the existence of the Supercontinent Atlantica, known regionally as the Rio de la Plata Craton.

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