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Yakutat collision and strain transfer across the northern Canadian Cordillera

2002; Geological Society of America; Volume: 30; Issue: 6 Linguagem: Inglês

10.1130/0091-7613(2002)030 2.0.co;2

1943-2682

S. Mazzotti, R. D. Hyndman,

Methane Hydrates and Related Phenomena

Research Article| June 01, 2002 Yakutat collision and strain transfer across the northern Canadian Cordillera Stéphane Mazzotti; Stéphane Mazzotti 1Pacific Geoscience Centre, Geological Survey of Canada, 9860 West Saanich Road, Sidney, British Columbia V8L 4B2, Canada, and School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia V8W 3P6, Canada Search for other works by this author on: GSW Google Scholar Roy D. Hyndman Roy D. Hyndman 1Pacific Geoscience Centre, Geological Survey of Canada, 9860 West Saanich Road, Sidney, British Columbia V8L 4B2, Canada, and School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia V8W 3P6, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information Stéphane Mazzotti 1Pacific Geoscience Centre, Geological Survey of Canada, 9860 West Saanich Road, Sidney, British Columbia V8L 4B2, Canada, and School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia V8W 3P6, Canada Roy D. Hyndman 1Pacific Geoscience Centre, Geological Survey of Canada, 9860 West Saanich Road, Sidney, British Columbia V8L 4B2, Canada, and School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia V8W 3P6, Canada Publisher: Geological Society of America Received: 07 Dec 2001 Revision Received: 12 Feb 2002 Accepted: 18 Feb 2002 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2002) 30 (6): 495–498. https://doi.org/10.1130/0091-7613(2002)030 2.0.CO;2 Article history Received: 07 Dec 2001 Revision Received: 12 Feb 2002 Accepted: 18 Feb 2002 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 Stéphane Mazzotti, Roy D. Hyndman; Yakutat collision and strain transfer across the northern Canadian Cordillera. Geology 2002;; 30 (6): 495–498. doi: https://doi.org/10.1130/0091-7613(2002)030 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 The collision of the Yakutat block in the corner of the Gulf of Alaska has resulted in large deformation in the adjacent Chugach–Saint Elias Mountains. This collision is inferred to produce the strong seismicity in the Mackenzie and Richardson Mountains of the northern Canadian Cordillera foreland belt, 800 km to the northeast. Strain is transmitted from the Yakutat collision across the northern Cordillera with little intervening deformation, in spite of high heat flow and thin mechanical lithosphere. Global Positioning System results and seismic deformation rates indicate a northeastward motion of the northern Cordillera at ∼5 mm/yr, relative to the craton to the east, that is mostly accommodated in the foreland belt. This quasi-rigid displacement of the Cordilleran upper crust requires a decoupling level in the weak lower crust that rises to join the basal detachment of thrusting in the foreland. Based on a two-dimensional mechanical model, we show that the strain transfer and the lower crust detachment are made possible by the high temperature (∼900 °C) at the base of the Cordilleran crust. The northern Cordillera presents a type example of an orogenic float associated with large-scale décollement in weak lower crust. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.