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    Time frame of 753–680 Ma juvenile accretion during the São Gabriel orogeny, southern Brazilian Shield

    Access Status
    Fulltext not available
    Authors
    Hartmann, L.
    Philipp, R.
    Santos, J.
    McNaughton, Neal
    Date
    2011
    Type
    Journal Article
    
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    Citation
    Hartmann, L. A. and Philipp, R. P. and Santos, J. O. S. and McNaughton, N. J. 2011. Time frame of 753–680 Ma juvenile accretion during the São Gabriel orogeny, southern Brazilian Shield. Gondwana Research. 19 (1): pp. 84-99.
    Source Title
    Gondwana Research
    DOI
    10.1016/j.gr.2010.05.001
    ISSN
    1342-937X
    School
    John de Laeter Centre for Mass Spectrometry (COE)
    URI
    http://hdl.handle.net/20.500.11937/5587
    Collection
    • Curtin Research Publications
    Abstract

    The time frame of the three main geological events in the Neoproterozoic Cambaí Complex, juvenile São Gabriel belt in the southern Brazilian Shield is established by integrating field mapping, back-scattered electron imaging and sensitive high-resolution ion microprobe (SHRIMP II) U–Pb dating of 96 zircon crystals from nine granitic and metasedimentary rock samples. The three events are: (1) voluminous flat-lying paragneisses (Cambaizinho Complex) and orthogneisses (Vila Nova gneisses) between 735 and 718 Ma, (2) tonalite–trondhjemite association (Lagoa da Meia-Lua Suite) between 710 and 690 Ma, and (3) late granodiorite intrusions (Sanga do Jobim Suite) at 680 Ma. An additional older volcanic event (Campestre Formation) was dated at 753 Ma. These results are most significant for the reconstruction of West Gondwana.

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