Mylonite to megabreccia: Tracking fault events within a transcurrent terrane boundary in Nova Scotia, Canada

Abstract

Research Article| May 01, 1996 Mylonite to megabreccia: Tracking fault events within a transcurrent terrane boundary in Nova Scotia, Canada Wes Gibbons; Wes Gibbons 1Department of Earth Sciences, University of Wales, Cardiff CF1 3YE, United Kingdom Search for other works by this author on: GSW Google Scholar Ronald Doig; Ronald Doig 2Department of Earth and Planetary Sciences, McGill University, Montréal H3A 2A7, Canada Search for other works by this author on: GSW Google Scholar Terence Gordon; Terence Gordon 3Department of Geology & Geophysics, University of Calgary, Calgary T2N 1N4, Canada Search for other works by this author on: GSW Google Scholar Brendan Murphy; Brendan Murphy 4Department of Geology, St. Francis Xavier University, Antigonish B2G 1CO, Canada Search for other works by this author on: GSW Google Scholar Peter Reynolds; Peter Reynolds 5Department of Earth Sciences, Dalhousie University, Halifax B3H 3J5, Canada Search for other works by this author on: GSW Google Scholar Joseph Clancy White Joseph Clancy White 6Department of Geology, University of New Brunswick, Fredericton E3B 5A3, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information Wes Gibbons 1Department of Earth Sciences, University of Wales, Cardiff CF1 3YE, United Kingdom Ronald Doig 2Department of Earth and Planetary Sciences, McGill University, Montréal H3A 2A7, Canada Terence Gordon 3Department of Geology & Geophysics, University of Calgary, Calgary T2N 1N4, Canada Brendan Murphy 4Department of Geology, St. Francis Xavier University, Antigonish B2G 1CO, Canada Peter Reynolds 5Department of Earth Sciences, Dalhousie University, Halifax B3H 3J5, Canada Joseph Clancy White 6Department of Geology, University of New Brunswick, Fredericton E3B 5A3, Canada Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1996) 24 (5): 411–414. https://doi.org/10.1130/0091-7613(1996)024<0411:MTMTFE>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Wes Gibbons, Ronald Doig, Terence Gordon, Brendan Murphy, Peter Reynolds, Joseph Clancy White; Mylonite to megabreccia: Tracking fault events within a transcurrent terrane boundary in Nova Scotia, Canada. Geology 1996;; 24 (5): 411–414. doi: https://doi.org/10.1130/0091-7613(1996)024<0411:MTMTFE>2.3.CO;2 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 SocietyGeology Search Advanced Search Abstract Transcurrent terrane boundaries commonly evolve into long-lived faults that preserve little evidence for early docking events. A remarkable exception is exposed at Clarke Head along the Appalachian Meguma terrane boundary in Nova Scotia, Canada, where a Late Carboniferous fault megabreccia contains Devonian (369 Ma: U-Pb zircon) granulite-grade mylonite fractured by veins filled with Visean amphibole (ca. 335 Ma: Ar-Ar). This fractured mylonite was later mixed with Early Carboniferous sedimentary rocks during megabrecciation (ca. 315–310 Ma). These three fault events are reflected in the tectonostratigraphic record. Devonian (ca. 370–360 Ma) transpressional terrane docking ramped Meguma up against Avalonia and shed clastic detritus across the fault system. The Visean brittle deformation recorded by the amphibole veins was coeval with marine regression at surface. The late Namurian megabrecciation event similarly produced unconformity followed by renewed nonmarine clastic sedimentation. The Clarke Head megabreccia therefore preserves an episodic late Paleozoic fault history spanning some 55 m.y. during convergence between Laurentia and Gondwana and the assembly of the Pangean supercontinent. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.