• Login
    About WHOAS
    View Item 
    •   WHOAS Home
    • Woods Hole Oceanographic Institution
    • Geology and Geophysics (G&G)
    • View Item
    •   WHOAS Home
    • Woods Hole Oceanographic Institution
    • Geology and Geophysics (G&G)
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of WHOASCommunities & CollectionsBy Issue DateAuthorsTitlesKeywordsThis CollectionBy Issue DateAuthorsTitlesKeywords

    My Account

    LoginRegister

    Statistics

    View Usage Statistics

    Origin and significance of the Delaney Dome Formation, Connemara, Ireland

    Thumbnail
    View/Open
    Draut and Clift.pdf (868.6Kb)
    Date
    2002
    Author
    Draut, Amy E.  Concept link
    Clift, Peter D.  Concept link
    Metadata
    Show full item record
    Citable URI
    https://hdl.handle.net/1912/107
    As published
    https://doi.org/10.1144/0016-764901034
    DOI
    10.1144/0016-764901034
    Keyword
     Ireland; Grampian Orogeny; U–Pb; Geochemistry; Subduction; Plate collision 
    Abstract
    Dalradian meta-sediments of the Laurentian margin and mafic intrusions thereof in SW Connemara, Ireland, tectonically overlie meta-rhyolites of the Delaney Dome Formation. The two units are separated by the Mannin Thrust. A new U–Pb age of 474.6 ± 5.5 Ma shows that the Delaney Dome Formation is a temporal equivalent of arc volcanic rocks preserved in the adjacent South Mayo Trough: the Tourmakeady Volcanic Group, erupted during the collision of an oceanic island arc with the Laurentian margin in the Grampian Orogeny. New rare earth and high field strength element data show that the Delaney Dome Formation and Tourmakeady Volcanic Group are chemically similar and arc-like in character. This suggests that the Delaney Dome Formation is an along-strike equivalent of the Tourmakeady Group, strike-slip faulted south of the South Mayo Trough during or after the Grampian Orogeny. Further correlation of these units with northern Appalachian rhyolites is also possible. The Delaney Dome Formation is an extrusive temporal equivalent of intrusions that penetrate the Connemara Dalradian. Thus, movement along the Mannin Thrust brought mid-crustal plutons and Dalradian country rocks tectonically above the extrusive volcanic sequence. The Mannin Thrust is identified as a major imbricating structure within a continental arc, but not a terrane boundary.
    Description
    Author Posting. © Geological Society of London, 2002. This article is posted here by permission of Geological Society of London for personal use, not for redistribution. The definitive version was published in Journal of the Geological Society 159 (2002): 95-103, doi: 10.1144/0016-764901034
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Journal of the Geological Society 159 (2002): 95-103
     

    Related items

    Showing items related by title, author, creator and subject.

    • Thumbnail

      Geophysical and geochemical survey of a large marine pockmark on the Malin Shelf, Ireland 

      Szpak, Michal T.; Monteys, Xavier; O'Reilly, S.; Simpson, A. J.; Garcia, Xavier; Evans, Rob L.; Allen, C. C. R.; McNally, D. J.; Courtier-Murias, D.; Kelleher, B. P. (American Geophysical Union, 2012-01-19)
      Marine pockmarks are a specific type of seabed geological setting resembling craters or pits and are considered seabed surface expressions of fluid flow in the subsurface. A large composite pockmark on the Malin Shelf, off ...
    • Thumbnail

      Laurentian crustal recycling in the Ordovician Grampian Orogeny : Nd isotopic evidence from western Ireland 

      Draut, Amy E.; Clift, Peter D.; Chew, David M.; Cooper, Matthew J.; Taylor, Rex N.; Hannigan, Robyn E. (Cambridge University Press, 2004-04-21)
      Because magmatism associated with subduction is thought to be the principal source for continental crust generation, assessing the relative contribution of pre-existing (subducted and assimilated) continental material to ...
    • Thumbnail

      Constraints on a shallow offshore gas environment determined by a multidisciplinary geophysical approach : the Malin Sea, NW Ireland 

      Garcia, Xavier; Monteys, Xavier; Evans, Rob L.; Szpak, Michal T. (John Wiley & Sons, 2014-04-02)
      During the Irish National Seabed Survey (INSS) in 2003, a gas related pockmark field was discovered and extensively mapped in the Malin Shelf region (NW Ireland). In summer 2006, additional complementary data involving ...
    All Items in WHOAS are protected by original copyright, with all rights reserved, unless otherwise indicated. WHOAS also supports the use of the Creative Commons licenses for original content.
    A service of the MBLWHOI Library | About WHOAS
    Contact Us | Send Feedback | Privacy Policy
    Core Trust Logo