Syncollisional basin development in the Appalachian orogen--The Saint-Daniel Melange, southern Quebec, Canada

Abstract

Research Article| January 01, 2006 Syncollisional basin development in the Appalachian orogen—The Saint-Daniel Mélange, southern Québec, Canada Jean-Michel Schroetter; Jean-Michel Schroetter 1Institut National de la Recherche Scientifique—Eau, Terre et Environnement, 490 de la Couronne, Québec, PQ G1K 9A9, Canada Search for other works by this author on: GSW Google Scholar Alain Tremblay; Alain Tremblay 2Département des Sciences de la Terre, Université du Québec à Montréal, CP 8888, Succursale centre ville, Montréal, PQ H3C 3P8, Canada Search for other works by this author on: GSW Google Scholar Jean H. Bédard; Jean H. Bédard 3Geological Survey of Canada—Québec, 490 de la Couronne, Québec, PQ G1K 9A9, Canada Search for other works by this author on: GSW Google Scholar Mike E. Villeneuve Mike E. Villeneuve 4Geological Survey of Canada—Ottawa, 601 Booth St., Ottawa, Ontario K1A OE8, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information Jean-Michel Schroetter 1Institut National de la Recherche Scientifique—Eau, Terre et Environnement, 490 de la Couronne, Québec, PQ G1K 9A9, Canada Alain Tremblay 2Département des Sciences de la Terre, Université du Québec à Montréal, CP 8888, Succursale centre ville, Montréal, PQ H3C 3P8, Canada Jean H. Bédard 3Geological Survey of Canada—Québec, 490 de la Couronne, Québec, PQ G1K 9A9, Canada Mike E. Villeneuve 4Geological Survey of Canada—Ottawa, 601 Booth St., Ottawa, Ontario K1A OE8, Canada Publisher: Geological Society of America Received: 16 Dec 2004 Revision Received: 19 May 2005 Accepted: 06 Jun 2005 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (2006) 118 (1-2): 109–125. https://doi.org/10.1130/B25779.1 Article history Received: 16 Dec 2004 Revision Received: 19 May 2005 Accepted: 06 Jun 2005 First Online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Jean-Michel Schroetter, Alain Tremblay, Jean H. Bédard, Mike E. Villeneuve; Syncollisional basin development in the Appalachian orogen—The Saint-Daniel Mélange, southern Québec, Canada. GSA Bulletin 2006;; 118 (1-2): 109–125. doi: https://doi.org/10.1130/B25779.1 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 The Saint-Daniel Mélange is an orogen-scale sedimentary basin of the Québec Appalachians that is commonly interpreted as the remnant of a subduction complex formed during the Taconian orogeny. However, geochronological, structural, and stratigraphical data from Laurentian continental margin rocks and adjacent ophiolitic rocks in southern Québec indicate that the Saint-Daniel Mélange is an olistostromal, syncollisional piggyback basin that represents the base of the Magog Group forearc basin. The regional stratigraphic framework of the Saint-Daniel Mélange and its relationships with underlying and overlying rock units have been established on the basis of six stratigraphic sections from the Thetford-Mines, Asbestos, and Mont-Orford ophiolitic complexes. Our results imply that (1) the Saint-Daniel Mélange is a sedimentary sequence that unconformably overlies different structural and pseudostratigraphic levels of the southern Québec ophiolites; (2) it is made up of four distinct and laterally discontinuous units that record the obduction of ophiolites onto Laurentia and exhumation of basement rocks, followed by subsidence and deposition of the overlying Saint-Victor Formation of the Magog Group; (3) the sedimentary rocks of the Saint-Daniel record a transition from ophiolite-dominated to continental sources, indicating progressive exhumation of both the ophiolite and the continental margin upon which it was obducted; 40Ar/39Ar analysis of muscovite from metamorphic rock fragments in debris flows of the mélange yield an age of 467 ± 2 Ma, which is within the range of Ar ages measured in metamorphic rocks that underlie the ophiolites, and indicates the uplift of metamorphosed continental deposits during or shortly after obduction; (4) the Saint-Daniel Mélange is stratigraphically overlain by the Magog Group and represents the base of a syncollisional basin developed in a forearc setting during the Taconian orogeny. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.