Biomagnetostratigraphy of the Vikinghogda Formation, Svalbard (Arctic Norway), and the geomagnetic polarity timescale for the Lower Triassic

Abstract

Research Article| September 01, 2008 Biomagnetostratigraphy of the Vikinghøgda Formation, Svalbard (Arctic Norway), and the geomagnetic polarity timescale for the Lower Triassic Mark W. Hounslow; Mark W. Hounslow † 1Center for Environmental Magnetism and Palaeomagnetism (CEMP), Geography Department, Lancaster University, Bailrigg, Lancaster LA1 4YB, UK †E-mail: [e-mail] Search for other works by this author on: GSW Google Scholar Clare Peters; Clare Peters 2School of Geography and Geosciences, Irvine Building, University of Saint Andrews, North Street, St. Andrews, KY16 9AL Fife, Scotland, UK Search for other works by this author on: GSW Google Scholar Atle Mørk; Atle Mørk 3SINTEF Petroleum Research, NO-7465 Trondheim, and Department of Geology and Mineral Resources Engineering, Norwegian University of Science and Technology, NO-7491, Trondheim, Norway Search for other works by this author on: GSW Google Scholar Wolfgang Weitschat; Wolfgang Weitschat 4Geologisch-Paläontologishes Institut und Museum, Universität Hamburg, Bundesstraβe 55, 20146 Hamburg, Germany Search for other works by this author on: GSW Google Scholar Jorunn Os Vigran Jorunn Os Vigran 5Mellomila 2, NO-7018 Trondheim, Norway Search for other works by this author on: GSW Google Scholar GSA Bulletin (2008) 120 (9-10): 1305–1325. https://doi.org/10.1130/B26103.1 Article history received: 16 Sep 2006 accepted: 18 Jan 2007 rev-recd: 19 Dec 2007 first online: 02 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 Mark W. Hounslow, Clare Peters, Atle Mørk, Wolfgang Weitschat, Jorunn Os Vigran; Biomagnetostratigraphy of the Vikinghøgda Formation, Svalbard (Arctic Norway), and the geomagnetic polarity timescale for the Lower Triassic. GSA Bulletin 2008;; 120 (9-10): 1305–1325. doi: https://doi.org/10.1130/B26103.1 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 A biomagnetostratigraphy for the Lower Triassic is constructed, using the ammonoid biostratigraphy from Arctic Boreal successions. Combined thermal and alternating field demagnetization determines the Triassic magnetic field polarity in 86% of specimens, with 36% showing linear trajectory line fits and the remainder showing great-circle trends toward the characteristic magnetization. Mean pole directions for the Deltadalen (λ = 50°, φ = 159°, dp/dm = 3.9°/5.1°), Lusitaniadalen (λ = 56°, φ = 163°, dp/dm = 4.4°/5.4°), and Vendomdalen (λ = 57°, φ = 143°, dp/dm = 4.4°/5.4°) members fall close to the European Lower Triassic apparent polar wander path. Mean directions for two of these member-means pass the reversal test. The remanence is predominantly carried by magnetite. The polarity stratigraphy, when integrated with the ammonoid and meager conodont data, is similar to that determined from successions in the Sverdrup Basin (Canada). The Permian-Triassic boundary post-dates a pronounced palynofloral turnover and predates a short duration reverse magnetozone (LT1n.1r). In the correlated Shangsi section (in South China), LT1n.1r occurs after the first appearance datum (FAD) of H. parvus, but in the Arctic is within the Otoceras boreale Zone. The late Griesbachian to early Smithian is mostly reverse polarity, with three normal-polarity intervals, overlain by mid and late Smithian normal polarity. The Spathian contains four reverse-polarity intervals, the oldest one within the early Spathian with the remainder in the late Spathian. The transition into the Anisian is within the uppermost reverse magnetozone, a feature documented in other sections of this age. The polarity pattern is correlated to other marine sections, indicating the robustness of the biomagneto-stratigraphic composite and its utility in calibrating Lower Triassic time. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.