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    Chronology of the Pueblo Viejo epithermal gold-silver deposit, Dominican Republic: formation in an Early Cretaceous intra-oceanic island arc and burial under ophiolite.

    Access Status
    Fulltext not available
    Authors
    Mueller, A.
    Hall, G.
    Nemchin, Alexander
    O'Brien, D.
    Date
    2008
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Mueller, Andreas G. and Hall, Gregory C. and Nemchin, Alexander A. and O'Brien, Darren. 2008. Chronology of the Pueblo Viejo epithermal gold-silver deposit, Dominican Republic: formation in an Early Cretaceous intra-oceanic island arc and burial under ophiolite. Mineralium Deposita. 43 (8): pp. 873-889.
    Source Title
    Mineralium Deposita
    DOI
    10.1007/s00126-008-0194-2
    ISSN
    00264598
    School
    WASM - Western Australian School of Mines
    Remarks

    The original publication is available at: http://www.springerlink.com

    URI
    http://hdl.handle.net/20.500.11937/15405
    Collection
    • Curtin Research Publications
    Abstract

    The Pueblo Viejo deposit (production to 1996:166 t Au, 760 t Ag) is located in the Dominican Republic on the Caribbean island of Hispaniola and ranks as one of the largest high-sulfidation/acid-sulfate epithermal deposits (reserves in 2007: 635 t Au, 3,648 t Ag). One of the advanced argillic ore bodies is cut by an inter-mineral andesite porphyry dike, which is altered to a retrograde chlorite-illite assemblage but overprinted by late-stage quartz-pyrite-sphalerite veins and associated low-grade Au, Ag, Zn, Cd, Hg, In, As, Se, and Te mineralization. The precise TIMS U-Pb age (109.6±0.6 Ma) of the youngest zircon population in this dike confirms that the deposit is part of the Early Cretaceous Los Ranchos intraoceanic island arc. Intrusion-related gold-sulfide mineralization took place during late andesite-dacite volcanism within a thick pile (>200 m) of carbonaceous sand- and siltstones deposited in a restricted marine basin.The high-level deposit was shielded from erosion after burial under a late Albian (109-100 Ma) ophiolite complex (8 km thick), which was in turn covered by the volcano-sedimentary successions (>4 km) of a Late Cretaceous-Early Tertiary calc-akaline magmatic arc. Estimates of stratigraphic thickness and published alunite, illite, and feldspar K-Ar ages and closure temperatures (alunite 270±20C, illite 260±30C, K-feldspar 150C) indicate a burial depth of about 12 km at 80 Ma. During peak burial metamorphism (300C and 300 MPa), the alteration assemblage kaolinite + quartz in the deposit dehydrated to pyrophyllite. Temperature-time relations imply that the Los Ranchos terrane then cooled at a rate of 3-4C/Ma during slow uplift and erosion.

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