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- W2131489724 abstract "Research Article| November 01, 2010 Timing of ophiolite obduction in the Grampian orogen David M. Chew; David M. Chew † 1Department of Geology, School of Natural Sciences, Trinity College Dublin, Dublin 2, Ireland †E-mail: chewd@tcd.ie Search for other works by this author on: GSW Google Scholar J. Stephen Daly; J. Stephen Daly 2UCD School of Geological Sciences, University College Dublin, Dublin 4, Ireland Search for other works by this author on: GSW Google Scholar Tomas Magna; Tomas Magna 3Institute of Mineralogy and Geochemistry, University of Lausanne, Quartier UNIL-Dorigny, Bâtiment Anthropole, CH-1015 Lausanne, Switzerland4Institute of Mineralogy, University of Münster, Corrensstrasse 24, D-48149 Münster, Germany5Czech Geological Survey, Klárov 3, 118 21 Prague 1, Czech Republic Search for other works by this author on: GSW Google Scholar Laurence M. Page; Laurence M. Page 6Department of Geology, GeoBiosphere Science Centre, Sölvegatan 12, 223 62 Lund University, Sweden Search for other works by this author on: GSW Google Scholar Christopher L. Kirkland; Christopher L. Kirkland 7Laboratory for Isotope Geology, Swedish Museum of Natural History, Stockholm, Box 50 007, SE-104 05 Stockholm, Sweden8Geological Survey of Western Australia, 100 Plain St., East Perth WA 6004, Australia Search for other works by this author on: GSW Google Scholar Martin J. Whitehouse; Martin J. Whitehouse 7Laboratory for Isotope Geology, Swedish Museum of Natural History, Stockholm, Box 50 007, SE-104 05 Stockholm, Sweden Search for other works by this author on: GSW Google Scholar Rebecca Lam Rebecca Lam 9MicroAnalysis Facility – Inco Innovation Centre, Memorial University, St. John's, NL A1C 5S7, Newfoundland, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information David M. Chew † 1Department of Geology, School of Natural Sciences, Trinity College Dublin, Dublin 2, Ireland J. Stephen Daly 2UCD School of Geological Sciences, University College Dublin, Dublin 4, Ireland Tomas Magna 3Institute of Mineralogy and Geochemistry, University of Lausanne, Quartier UNIL-Dorigny, Bâtiment Anthropole, CH-1015 Lausanne, Switzerland4Institute of Mineralogy, University of Münster, Corrensstrasse 24, D-48149 Münster, Germany5Czech Geological Survey, Klárov 3, 118 21 Prague 1, Czech Republic Laurence M. Page 6Department of Geology, GeoBiosphere Science Centre, Sölvegatan 12, 223 62 Lund University, Sweden Christopher L. Kirkland 7Laboratory for Isotope Geology, Swedish Museum of Natural History, Stockholm, Box 50 007, SE-104 05 Stockholm, Sweden8Geological Survey of Western Australia, 100 Plain St., East Perth WA 6004, Australia Martin J. Whitehouse 7Laboratory for Isotope Geology, Swedish Museum of Natural History, Stockholm, Box 50 007, SE-104 05 Stockholm, Sweden Rebecca Lam 9MicroAnalysis Facility – Inco Innovation Centre, Memorial University, St. John's, NL A1C 5S7, Newfoundland, Canada †E-mail: chewd@tcd.ie Publisher: Geological Society of America Received: 30 Jul 2009 Revision Received: 02 Nov 2009 Accepted: 17 Nov 2009 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2010 Geological Society of America GSA Bulletin (2010) 122 (11-12): 1787–1799. https://doi.org/10.1130/B30139.1 Article history Received: 30 Jul 2009 Revision Received: 02 Nov 2009 Accepted: 17 Nov 2009 First Online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation David M. Chew, J. Stephen Daly, Tomas Magna, Laurence M. Page, Christopher L. Kirkland, Martin J. Whitehouse, Rebecca Lam; Timing of ophiolite obduction in the Grampian orogen. GSA Bulletin 2010;; 122 (11-12): 1787–1799. doi: https://doi.org/10.1130/B30139.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract This study addresses the timing and pressure-temperature (P-T) conditions of ophiolite obduction, one of the proposed causes of the ca. 470 Ma Grampian orogeny of Scotland and Ireland. This event gave rise to the main structural and metamorphic characteristics of the Grampian terrane—the type area for Barrovian metamorphism, the cause of which remains enigmatic despite a century of research. Zircons from the Highland Border ophiolite, Scotland, define a 499 ± 8 Ma U-Pb concordia age, which is interpreted as dating magmatism. Its metamorphism is dated by a 490 ± 4 Ma 40Ar-39Ar hornblende age, and a 488 ± 1 Ma 40Ar-39Ar muscovite age from a metasedimentary xenolith within it, from which P-T estimates of 5.3 kbar and 580 °C relate to ophiolite obduction. Metamorphism of the Deerpark complex ophiolitic mélange (Irish correlative of the Highland Border ophiolite) is constrained by a 514 ± 3 Ma 40Ar-39Ar hornblende age, while mica schist slivers within it yield detrital zircon U-Pb ages consistent with Laurentian provenance and Rb-Sr and 40Ar-39Ar muscovite ages of ca. 482 Ma. P-T values of 3.3 kbar and 580 °C for the mica schist constrain the conditions of ophiolite obduction. Metamorphic mineral ages from the Grampian terrane (Dalradian Supergroup) are substantially younger (ca. 475–465 Ma) than those from the ophiolites. If conductive heating in overthickened crust was the cause of Barrovian metamorphism, then collisional thickening must have started soon after ophiolite obduction at ca. 490 Ma in order to generate the ca. 470 Ma metamorphic peak in the Grampian terrane. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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- W2131489724 title "Timing of ophiolite obduction in the Grampian orogen" @default.
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