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Boninitic magmatism in a continental margin setting, Yukon- Tanana terrane, southeastern Yukon, Canada

2001; Geological Society of America; Volume: 29; Issue: 8 Linguagem: Inglês

10.1130/0091-7613(2001)029 2.0.co;2

1943-2682

Stephen J. Piercey, Donald C. Murphy, James K. Mortensen, S J Paradis,

Paleontology and Stratigraphy of Fossils

Research Article| August 01, 2001 Boninitic magmatism in a continental margin setting, Yukon- Tanana terrane, southeastern Yukon, Canada Stephen J. Piercey; Stephen J. Piercey 1Mineral Deposit Research Unit, Department of Earth and Ocean Sciences, University of British Columbia, 6339 Stores Road, Vancouver, British Columbia V6T 1Z4, Canada Search for other works by this author on: GSW Google Scholar Donald C. Murphy; Donald C. Murphy 22-Yukon Geology Program, P.O. Box 2703 (F-3), Whitehorse, Yukon Y1A 2C6, Canada Search for other works by this author on: GSW Google Scholar James K. Mortensen; James K. Mortensen 3Mineral Deposit Research Unit, Department of Earth and Ocean Sciences, University of British Columbia, 6339 Stores Road, Vancouver, British Columbia V6T 1Z4, Canada Search for other works by this author on: GSW Google Scholar Suzanne Paradis Suzanne Paradis 4Mineral Resources Division, Geological Survey of Canada, 9860 West Saanich Road, Sidney, British Columbia V8L 4B2, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information Stephen J. Piercey 1Mineral Deposit Research Unit, Department of Earth and Ocean Sciences, University of British Columbia, 6339 Stores Road, Vancouver, British Columbia V6T 1Z4, Canada Donald C. Murphy 22-Yukon Geology Program, P.O. Box 2703 (F-3), Whitehorse, Yukon Y1A 2C6, Canada James K. Mortensen 3Mineral Deposit Research Unit, Department of Earth and Ocean Sciences, University of British Columbia, 6339 Stores Road, Vancouver, British Columbia V6T 1Z4, Canada Suzanne Paradis 4Mineral Resources Division, Geological Survey of Canada, 9860 West Saanich Road, Sidney, British Columbia V8L 4B2, Canada Publisher: Geological Society of America Received: 30 Oct 2000 Revision Received: 04 Apr 2001 Accepted: 03 May 2001 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2001) 29 (8): 731–734. https://doi.org/10.1130/0091-7613(2001)029 2.0.CO;2 Article history Received: 30 Oct 2000 Revision Received: 04 Apr 2001 Accepted: 03 May 2001 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 Stephen J. Piercey, Donald C. Murphy, James K. Mortensen, Suzanne Paradis; Boninitic magmatism in a continental margin setting, Yukon- Tanana terrane, southeastern Yukon, Canada. Geology 2001;; 29 (8): 731–734. doi: https://doi.org/10.1130/0091-7613(2001)029 2.0.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 Mid-Paleozoic mafic rocks in the Finlayson Lake region of the Yukon-Tanana terrane, southeastern Yukon, Canada, have the diagnostic geochemical signatures of boninites: high MgO, Cr, Ni, and Co contents, intermediate SiO2 contents, high Mg#'s (MgO/ (MgO+FeO*), Al2O3/TiO2, and Zr(Hf)/middle rare earth element (REE) ratios; low TiO2, REE, and high-field-strength element contents; and U-shaped primitive mantle–normalized trace element patterns. However, unlike most modern and ancient boninitic rocks that are typically associated with intraoceanic realms, those from the Finlayson Lake region are part of a mid-Paleozoic continental margin arc-backarc magmatic system. We propose a model in which the boninitic rocks from the Finlayson Lake region formed as a result of spreading ridge propagation into an arc built on composite basement of oceanic and continental crust. In the oceanic segment, upwelling asthenosphere induced melting of a subducted-slab metasomatized refractory mantle source to form boninitic magmatism. In the continental sector, upwelling asthenospheric mantle, and/or the melts derived thereof, induced crustal melting, which explains the large volume of temporally equivalent felsic volcanic and intrusive rocks. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.