The German Bank pluton, offshore SW Nova Scotia: Age, petrology, and regional significance for Alleghanian plutonism

Abstract

Research Article| May 01, 2010 The German Bank pluton, offshore SW Nova Scotia: Age, petrology, and regional significance for Alleghanian plutonism Georgia Pe-Piper; Georgia Pe-Piper † 1Department of Geology, Saint Mary's University, Halifax, Nova Scotia, B3H 3C3, Canada †E-mail: gpiper@smu.ca Search for other works by this author on: GSW Google Scholar Sandra L. Kamo; Sandra L. Kamo 2Jack Satterly, Geochronology Laboratory, Department of Geology, University of Toronto, 22 Russell Street, Toronto, Ontario, M5S 3B1, Canada Search for other works by this author on: GSW Google Scholar Curtis McCall Curtis McCall § 1Department of Geology, Saint Mary's University, Halifax, Nova Scotia, B3H 3C3, Canada §Present address: Husky Energy, 707 8th Avenue SW, Box 6525, Station D, Calgary, Alberta, T2P 3G7, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information Georgia Pe-Piper † 1Department of Geology, Saint Mary's University, Halifax, Nova Scotia, B3H 3C3, Canada Sandra L. Kamo 2Jack Satterly, Geochronology Laboratory, Department of Geology, University of Toronto, 22 Russell Street, Toronto, Ontario, M5S 3B1, Canada Curtis McCall § 1Department of Geology, Saint Mary's University, Halifax, Nova Scotia, B3H 3C3, Canada †E-mail: gpiper@smu.ca §Present address: Husky Energy, 707 8th Avenue SW, Box 6525, Station D, Calgary, Alberta, T2P 3G7, Canada Publisher: Geological Society of America Received: 08 Feb 2009 Revision Received: 13 May 2009 Accepted: 16 May 2009 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2010 Geological Society of America GSA Bulletin (2010) 122 (5-6): 690–700. https://doi.org/10.1130/B30031.1 Article history Received: 08 Feb 2009 Revision Received: 13 May 2009 Accepted: 16 May 2009 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 Georgia Pe-Piper, Sandra L. Kamo, Curtis McCall; The German Bank pluton, offshore SW Nova Scotia: Age, petrology, and regional significance for Alleghanian plutonism. GSA Bulletin 2010;; 122 (5-6): 690–700. doi: https://doi.org/10.1130/B30031.1 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 Permian plutonism is widespread in the U.S. Appalachians, but not in the Canadian sector of the Appalachians. The German Bank pluton, sampled in two boreholes offshore southwestern Nova Scotia, gave a U-Pb age of 300 ± 1 Ma, determined by isotope dilution–thermal ionization mass spectrometry (ID-TIMS) on thermally annealed and chemically etched zircon grains. Electron-microprobe dating of monazite yielded an age of 308 ± 13 Ma. Late Paleozoic plutonism in the Canadian Appalachians was dominated by northwestward subduction of the Rheic Ocean, whereas the Rheic Ocean in the U.S. Appalachians closed by southeasterly subduction. A slab tear therefore developed at the southwestern margin of the Rheic Ocean slab beneath the Canadian Appalachians. The high Sr and Ba metaluminous magnetite granite of the German Bank pluton resulted from melting of underplated lower crust and/or lithospheric mantle by a rising asthenospheric diapir related to this slab tear. Geochemically, the German Bank pluton is similar to most 300–265 Ma plutons of the southern Appalachians, except in its strongly negative Nd isotopic composition that results from the underthrusting of a ca. 2 Ga lower crustal block of Saharan craton. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.