Devonian Antler fold and thrust belt and foreland basin development in the southern Canadian Cordillera: implications for the Western Canada Sedimentary Basin

Abstract

Research Article| March 01, 2001 Devonian Antler fold and thrust belt and foreland basin development in the southern Canadian Cordillera: implications for the Western Canada Sedimentary Basin Kevin G. Root Kevin G. Root Alberta Energy Company Ltd., 3900, 421 - 7 Avenue SW, Calgary, AB, T2P 4K9 Search for other works by this author on: GSW Google Scholar Author and Article Information Kevin G. Root Alberta Energy Company Ltd., 3900, 421 - 7 Avenue SW, Calgary, AB, T2P 4K9 Publisher: Canadian Society of Petroleum Geologists Received: 19 Jan 2001 Accepted: 12 Mar 2001 First Online: 02 Mar 2017 Online ISSN: 2368-0261 Print ISSN: 0007-4802 © The Society of Canadian Petroleum Geologists Bulletin of Canadian Petroleum Geology (2001) 49 (1): 7–36. https://doi.org/10.2113/49.1.7 Article history Received: 19 Jan 2001 Accepted: 12 Mar 2001 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 Kevin G. Root; Devonian Antler fold and thrust belt and foreland basin development in the southern Canadian Cordillera: implications for the Western Canada Sedimentary Basin. Bulletin of Canadian Petroleum Geology 2001;; 49 (1): 7–36. doi: https://doi.org/10.2113/49.1.7 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 This contribution describes evidence for Middle Devonian contractional deformation and foreland basin development in the Purcell and Rocky mountains of southern Canada. These are interpreted as early manifestations of the Antler Orogeny, which is well documented in the western United States. Middle Devonian foreland basin strata include the Mount Forster Formation and correlative strata, which change laterally from > 500 m of lithic sandstones, conglomerates and volcanic flows in westernmost exposures to predominantly shale and gypsum in exposures to the east, and the Harrogate Formation, which comprises shallow water carbonates and minor mudstone. Significant local lateral thickness and facies changes, and angular unconformities that truncate folds, were created within the Middle Devonian foreland basin strata in the Delphine Creek region of southeastern British Columbia in response to syndepositional folding within an interpreted wedge-top basin. A normal fault, formed during Neoproterozoic rifting, was inverted during the Devonian contraction. Middle Devonian foreland basin strata pinch out to the northeast against the West Alberta Ridge, which was a Middle Devonian paleohigh interpreted to have been a peripheral bulge.Integration of the interpretations of Middle Devonian fold and thrust belt and foreland basin development with published structural and stratigraphic evidence from elsewhere in western Canada leads to the conclusion that Antler fold and thrust belt and foreland basin development may have occurred along the length of the Canadian portion of the ancient Cordilleran continental margin during the Devonian and Mississippian. The Western Canada Sedimentary Basin is interpreted to have been a distal foreland basin during the Devonian and Mississippian. Important changes in subsidence and uplift patterns within the basin, and an increase in the general rate of subsidence, may have been influenced by a combination of flexural loading by thrust sheets and foreland basin strata and horizontal in-plane stresses associated with Antler convergent tectonism. Faults that influenced deposition of mid-Paleozoic sediments, and created permeable pathways for the flow of hot fluids, may have formed as the result of horizontal in-plane stresses. Hot fluids interpreted to have significantly influenced diagenetic processes in mid-Paleozoic carbonate reservoir rocks may have been tectonically expelled in response to Antler thrust belt development. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.