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    Zircon ages delimit the provenance of a sand extrudite from the Botucatu Formation in the Paraná volcanic province, Iraí, Brazil

    231410_231410.pdf (2.194Mb)
    Access Status
    Open access
    Authors
    Pinto, V.
    Hartmann, L.
    Santos, J.
    McNaughton, Neal
    Date
    2015
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Pinto, V. and Hartmann, L. and Santos, J. and McNaughton, N. 2015. Zircon ages delimit the provenance of a sand extrudite from the Botucatu Formation in the Paraná volcanic province, Iraí, Brazil. Anais da Academia Brasileira de Ciencias. 87 (3): pp. 1611-1622.
    Source Title
    Anais da Academia Brasileira de Ciencias
    DOI
    10.1590/0001-3765201520130222
    ISSN
    0001-3765
    School
    John de Laeter CoE in Mass Spectrometry
    Remarks

    This open access article is distributed under the Creative Commons license http://creativecommons.org/licenses/by/4.0/

    URI
    http://hdl.handle.net/20.500.11937/32049
    Collection
    • Curtin Research Publications
    Abstract

    Ion microprobe age determinations of 102 detrital zircon crystals from a sand extrudite, Cretaceous Paraná volcanic province, set limits on the origin of the numerous sand layers present in this major flood basalt province. The zircon U-Pb ages reflect four main orogenic cycles: Mesoproterozoic (1155-962 Ma), latest Proterozoic-early Cambrian (808-500 Ma) and two Palaeozoic (Ordovician– 480 to 450 Ma, and Permian to Lower Triassic– 296 to 250 Ma). Two additional small concentrations are present in the Neoarchean (2.8 to 2.6 Ga) and Paleoproterozoic (2.0 to 1.7 Ga). Zircon age peaks closely match the several pulses of igneous activity in the Precambrian Brazilian Shield and active orogeny in Argentina. A main delimitation of the origin of the sand is the absence of zircon ages from the underlying Cretaceous basalts, thus supporting an injectite origin of the sand as an extrudite that emanated from the paleoerg that constitutes the Botucatu Formation.

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