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    Geochemistry, U-Pb SHRIMP zircon dating and Hf isotopes of the Gondwanan magmatism in NW Argentina: Petrogenesis and geodynamic implications

    231407_231407.pdf (3.132Mb)
    Access Status
    Open access
    Authors
    Poma, S.
    Zappettini, E.
    Quenardelle, S.
    Santos, J.
    Koukharsky, M.
    Belousova, E.
    McNaughton, Neal
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Poma, S. and Zappettini, E. and Quenardelle, S. and Santos, J. and Koukharsky, M. and Belousova, E. and McNaughton, N. 2014. Geochemistry, U-Pb SHRIMP zircon dating and Hf isotopes of the Gondwanan magmatism in NW Argentina: Petrogenesis and geodynamic implications. Andean Geology. 41 (2): pp. 267-292.
    Source Title
    Andean Geology
    DOI
    10.5027/andgeoV41n2-a01
    ISSN
    0718-7092
    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/20.500.11937/32073
    Collection
    • Curtin Research Publications
    Abstract

    We have carried out zircon U-Pb SHRIMP dating and Hf isotope determinations as well as geochemical analyses on three plutonic units of Gondwanan magmatism that crop out in NW Argentina. Two episodes of different age and genesis have been identified. The older one includes gabbros and diorites (Río Grande Unit) of 267±3 Ma and granitoids (belonging to the Llullaillaco Unit) of 263±1 Ma (late Permian, Guadalupian); the parent magmas were generated in an intraplate environment and derived from an enriched mantle but were subsequently contaminated by crustal components. The younger rocks are granodiorites with arc signature (Chuculaqui Unit) and an age of 247±2 Ma (middle Triassic-Anisian). Hf isotope signature of the units indicates mantle sources as well as crustal components. Hf model ages obtained are consistent with the presence of crustal Mesoproterozoic (mainly Ectasian to Calymnian (TDM(c) =1.24 to 1.44 Ga-negative Hf(T)) and juvenile Cryogenian sources (TDM=0.65 to 0.79 Ga-positive eHf(T)), supporting the idea of a continuous, mostly Mesoproterozoic, basement under the Central Andes, as an extension of the Arequipa-Antofalla massif. The tectonic setting and age of the Gondwanan magmatism in NW Argentina allow to differentiate: a. Permian intra-plate magmatism developed under similar conditions to the upper section of the Choiyoi magmatism exposed in the Frontal Cordillera and San Rafael Block, Argentina; b. Triassic magmatism belonging to a poorly known subduction-related magmatic arc segment of mostly NS trend with evidence of porphyry type mineralization in Chile, allowing to extend this metallotect into Argentina.

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