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    U-Pb zircon and <sup>40</sup>Ar/<sup>39</sup>Ar geochronology of sericite from hydrothermal alteration zones: new constraints for the timing of Ediacaran gold mineralization in the Sukhaybarat area, western Afif terrane, Saudi Arabia

    Access Status
    Fulltext not available
    Authors
    Harbi, H.
    Ali, K.
    McNaughton, Neal
    Andresen, A.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Harbi, H. and Ali, K. and McNaughton, N. and Andresen, A. 2017. U-Pb zircon and <sup>40</sup>Ar/<sup>39</sup>Ar geochronology of sericite from hydrothermal alteration zones: new constraints for the timing of Ediacaran gold mineralization in the Sukhaybarat area, western Afif terrane, Saudi Arabia. Mineralium Deposita: pp. 1-18.
    Source Title
    Mineralium Deposita
    DOI
    10.1007/s00126-017-0751-7
    ISSN
    0026-4598
    School
    John de Laeter Centre
    URI
    http://hdl.handle.net/20.500.11937/56143
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 Springer-Verlag GmbH Germany The Sukhaybarat East and Red Hill deposits, in the northeastern part of the Arabian Shield, are mesothermal vein-type gold deposits hosted by late Cryogenian-Ediacaran intrusive rocks of the Idah suites (diorite, tonalite, granodiorite) and, at Sukhaybarat East, also by Ediacaran metasedimentary rocks. Gold mineralization comprises quartz-arsenopyrite veins (Sukhaybarat East), quartz-carbonate-pyrite veins (Red Hill), and subordinate gold-base metal sulfide veins. In the Red Hill deposit, alteration is complicated due to multiple overprinting hydrothermal events and is characteristically affected by pervasive, pink quartz-K-feldspar-hematite alteration which is overprinted by potassic alteration characterized by a quartz-biotite-carbonate-muscovite/sericite-rutile-apatite assemblage. This assemblage is associated with molybdenite veins which appear to form late in the paragenetic sequence and may represent either evolution of the ore fluid composition, or a later, unrelated mineralized fluids. Hydrothermal alteration at the Sukhaybarat East deposit is dominated by quartz-carbonate-sericite-arsenopyrite assemblages. Zircon from ore-hosting tonalite at Sukhaybarat East yields a U-Pb age of 629 ± 6 Ma, and biotite from the same rock gives an 40 Ar/ 39 Ar age of 622 ± 23 Ma. The 40 Ar/ 39 Ar age is within the uncertainty range for the U-Pb age of the host intrusion and is interpreted as a minimally disturbed cooling age for the tonalite. In the Red Hill area, granodiorite was emplaced at 615 ± 5 Ma, whereas muscovite/sericite separated from a mineralized sample of a quartz-carbonate-pyrite vein, that was overprinted by molybdenite-bearing veinlets, yields an 40 Ar/ 39 Ar age of 597 ± 8 Ma. We interpreted this age to represent the maximum age of the molybdenite mineralization and the probable minimum age of gold mineralization in the Red Hill deposit.

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