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    Re-Os dating of pyrite confirms an early diagenetic onset and extended duration of mineralization in the Irish Zn-Pb ore field

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    Authors
    Hnatyshin, D
    Creaser, RA
    Wilkinson, JJ cc
    Gleeson, SA
    Issue date
    2015-02-01
    Submitted date
    2017-06-06
    Subject Terms
    absolute age
    Ireland
    lead ores
    Midlands
    mineral deposits
    genesis
    Mississippian
    Paleozoic
    Re/Os
    sedimentary rocks
    Carboniferous
    carbonate rocks
    Europe
    metasomatism
    lead-zinc deposits
    metal ores
    orogeny
    Western Europe
    zinc ores
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    Abstract
    The Irish Midlands region contains one of the world’s largest hydrothermal Zn-Pb ore districts, but uncertainty exists in the timing of mineralization relative to host rock ages. Consequently, genetic models for ore formation are poorly constrained and remain controversial. Here we use Re-Os geochronology to show that ore-stage pyrite from the Lisheen deposit formed at 346.6 ± 3.0 Ma, shortly after host rock deposition. Pyrite from the Silvermines deposit returns an age of 334.0 ± 6.1 Ma, indicating that at least some mineralization occurred during later burial. These age determinations show that the much younger paleomagnetic ages reported for the Irish Zn-Pb deposits reflect remagnetization during the Variscan orogeny, a process that we suggest affects paleomagnetic dating more widely. The Re-Os ages overlap with the ages of lower Carboniferous volcanic rocks in the Midlands, which are the product of magmatism that has been invoked as the driving force for hydrothermal activity. The relatively low initial Os ratios for both Lisheen (0.253 ± 0.045) and Silvermines (0.453 ± 0.006) are compatible with derivation of Os from these magmas, or from the Caledonian basement that underlies the ore deposits.
    Citation
    Danny Hnatyshin, Robert A. Creaser, Jamie J. Wilkinson, Sarah A. Gleeson; Re-Os dating of pyrite confirms an early diagenetic onset and extended duration of mineralization in the Irish Zn-Pb ore field. Geology ; 43 (2): 143–146.
    Journal
    Geology
    URI
    http://hdl.handle.net/10141/622725
    DOI
    10.1130/G36296.1
    Type
    Journal Article
    Item Description
    This journal is published under the terms of Green Open Access. Authors may post a copy of the accepted (i.e., post-peer review) version of their paper (https://doi.org/10.1130/G36296.1) in a repository of their choice or to their personal website after the relevant embargo period has passed. The embargo period will be 12 months from formal online publication.
    ISSN
    0091-7613
    EISSN
    1943-2682
    ae974a485f413a2113503eed53cd6c53
    10.1130/G36296.1
    Scopus Count
    Collections
    Earth sciences

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