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Superimposed Neoproterozoic and Early Tertiary alkaline magmatism in the La Biche River area, southeast Yukon Territory

2004; Canadian Society of Petroleum Geologists; Volume: 52; Issue: 4 Linguagem: Inglês

10.2113/52.4.325

2368-0261

Lee C. Pigage, J K Mortensen,

High-pressure geophysics and materials

Research Article| December 01, 2004 Superimposed Neoproterozoic and Early Tertiary alkaline magmatism in the La Biche River area, southeast Yukon Territory L.C. Pigage; L.C. Pigage Yukon Geological Survey, P.O. Box 2703 (K-10), Whitehorse, Yukon Y1A 2C6, lee.pigage@gov.yk.ca Search for other works by this author on: GSW Google Scholar J.K. Mortensen J.K. Mortensen Department of Earth and Ocean Science, The University of British Columbia, 6339 Stores Road, Vancouver, B.C. V6T 1Z4 Search for other works by this author on: GSW Google Scholar Author and Article Information L.C. Pigage Yukon Geological Survey, P.O. Box 2703 (K-10), Whitehorse, Yukon Y1A 2C6, lee.pigage@gov.yk.ca J.K. Mortensen Department of Earth and Ocean Science, The University of British Columbia, 6339 Stores Road, Vancouver, B.C. V6T 1Z4 Publisher: Canadian Energy Geoscience Association Received: 18 Dec 2003 Accepted: 04 Jun 2004 First Online: 02 Mar 2017 Online ISSN: 2368-0261 Print ISSN: 0007-4802 © The Society of Canadian Petroleum Geologists Bulletin of Canadian Petroleum Geology (2004) 52 (4): 325–342. https://doi.org/10.2113/52.4.325 Article history Received: 18 Dec 2003 Accepted: 04 Jun 2004 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation L.C. Pigage, J.K. Mortensen; Superimposed Neoproterozoic and Early Tertiary alkaline magmatism in the La Biche River area, southeast Yukon Territory. Bulletin of Canadian Petroleum Geology 2004;; 52 (4): 325–342. doi: https://doi.org/10.2113/52.4.325 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 SocietyBulletin of Canadian Petroleum Geology Search Advanced Search Abstract Three distinct intrusive phases have been identified in the Pool Creek map area (95C/5), southeast Yukon, during geological mapping as part the Central Foreland NATMAP project: a nepheline syenite and associated dykes (Pool Creek syenite), a biotite syenite, and an intrusive breccia. All intrusive units are exposed in the core of a large anticline in the transition zone between Early Paleozoic MacDonald Platform carbonates to the southeast and Selwyn Basin basinal shales to the northwest. U-Pb isotopic dating of zircons from the different intrusive phases resulted in a cluster of ages of 640–650 Ma for the Pool Creek syenite and associated dykes, and an age of 51.8 ± 0.2 Ma for the biotite syenite. An age could not be assigned to the intrusive breccia on the basis of the analytical data. Similar-age Neoproterozoic igneous rocks are rare in the North American Cordillera. The Pool Creek syenite may be related to prolonged syn-Winderemere age rifting on the western margin of Laurentia. The superposition of Eocene and Neoproterozoic intrusive activity is rare and cannot be readily explained, but may be related to focused magmatism along the Liard Line, which is interpreted as a Neoproterozoic transfer fault structure. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.