2015/04/14 by C A Evenchick, W J Davis, Jean H. Bédard +2 · 91 citations
Earth and Planetary Sciences · #Archaeology #Arctic #Canada Basin #Geochemistry #Geochronology #Geological Studies and Exploration #Geological and Geochemical Analysis #Geological survey #Geology #Geology and Paleoclimatology Research #History #Magmatism #Oceanography #Paleontology #Sill #Stratigraphy #Sverdrup
paper · doi:10.1130/b31190.1
published in Geological Society of America Bulletin 127(9-10), 1366-1390 (Geological Society of America)
openalex publication_date 2015/04/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/11
Research Article| September 01, 2015 Evidence for protracted High Arctic large igneous province magmatism in the central Sverdrup Basin from stratigraphy, geochronology, and paleodepths of saucer-shaped sills Carol A. Evenchick; Carol A. Evenchick † 1Geological Survey of Canada (GSC-Pacific), 1500-605 Robson Street, Vancouver, British Columbia V6B 5J3, Canada †[email protected] Search for other works by this author on: GSW Google Scholar William J. Davis; William J. Davis 2Geological Survey of Canada (GSC-Ottawa), 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada Search for other works by this author on: GSW Google Scholar Jean H. Bédard; Jean H. Bédard 3Geological Survey of Canada (GSC-Québec), 490 de la Couronne, Québec, Québec G1K 9A9, Canada Search for other works by this author on: GSW Google Scholar Nathan Hayward; Nathan Hayward 1Geological Survey of Canada (GSC-Pacific), 1500-605 Robson Street, Vancouver, British Columbia V6B 5J3, Canada Search for other works by this author on: GSW Google Scholar Richard M. Friedman Richard M. Friedman 4Pacific Centre for Isotopic and Geochemical Research, Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information Carol A. Evenchick † 1Geological Survey of Canada (GSC-Pacific), 1500-605 Robson Street, Vancouver, British Columbia V6B 5J3, Canada William J. Davis 2Geological Survey of Canada (GSC-Ottawa), 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada Jean H. Bédard 3Geological Survey of Canada (GSC-Québec), 490 de la Couronne, Québec, Québec G1K 9A9, Canada Nathan Hayward 1Geological Survey of Canada (GSC-Pacific), 1500-605 Robson Street, Vancouver, British Columbia V6B 5J3, Canada Richard M. Friedman 4Pacific Centre for Isotopic and Geochemical Research, Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada †[email protected] Publisher: Geological Society of America Received: 15 Aug 2014 Revision Received: 16 Jan 2015 Accepted: 04 Mar 2015 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2015 Geological Society of America GSA Bulletin (2015) 127 (9-10): 1366–1390. 10.1130/B31190.1 Article history Received: 15 Aug 2014 Revision Received: 16 Jan 2015 Accepted: 04 Mar 2015 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 Carol A. Evenchick, William J. Davis, Jean H. Bédard, Nathan Hayward, Richard M. Friedman; Evidence for protracted High Arctic large igneous province magmatism in the central Sverdrup Basin from stratigraphy, geochronology, and paleodepths of saucer-shaped sills. GSA Bulletin 2015;; 127 (9-10): 1366–1390. doi: 10.1130/B31190.1 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 Field evidence, map compilation, geochemistry, geochronology, and potential field data document six intervals of Cretaceous magmatism in the central Sverdrup Basin. These are: (1) Hauterivian (ca. 130 Ma) volcaniclastic deposition in the lower Isachsen Formation; (2) 126.6 ± 1.2 Ma (U-Pb zircon) gabbroic intrusion; (3) 120.8 ± 0.8 Ma (U-Pb baddeleyite) diabasic intrusion; (4) 105.40 ± 0.22 Ma (U-Pb detrital zircon) pyroclastic deposition at the top of the Invincible Point Member, Christopher Formation; (5) upper Albian (ca. 103 Ma) pillow and hydroclastic breccia in the upper Christopher Formation; and (6) uppermost Albian (ca. 101 Ma) volcanic breccia and scoria in the Hassel Formation. Whole-rock geochemical data show that these magmatic rocks are similar to previously documented High Arctic large igneous province tholeiitic basalts, but analyses of fresh glass in tuffs reveal evolved ferroandesite to dacite compositions not recorded in whole-rock data. Approximate ages of saucer-shaped sills inferred from the relationship of sill width to depth of emplacement suggest at least three intervals of sill emplacement between 130 and 120 Ma. The new data show that volcanism in the Sverdrup Basin was of greater spatial extent, and that magmatism occurred more frequently, than was previously recognized. Comparison of the new central Sverdrup Basin data and interpretations with other data sets from the Sverdrup Basin, Svalbard, and Franz Josef Land suggests that High Arctic large igneous province magmatism occurred over a more extended period of time in the central Sverdrup Basin than in other regions. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.