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Middle Jurassic to earliest Cretaceous mid-crustal tectono-metamorphism in the northern Canadian Cordillera: Recording foreland-directed migration of an orogenic front

2014; Geological Society of America; Volume: 126; Issue: 11-12 Linguagem: Inglês

10.1130/b31037.1

1943-2674

Reid D. Staples, Donald C. Murphy, H. Daniel Gibson, Maurice Colpron, R G Berman, J J Ryan,

earthquake and tectonic studies

Research Article| November 01, 2014 Middle Jurassic to earliest Cretaceous mid-crustal tectono-metamorphism in the northern Canadian Cordillera: Recording foreland-directed migration of an orogenic front R.D. Staples; R.D. Staples † 1Department of Earth Sciences, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada †E-mails: rdstaple@sfu.ca; Donald.Murphy@gov.yk.ca; hdgibson@sfu.ca; maurice.colpron@gov.yk.ca; Rob.Berman@nrcan-rncan.gc.ca; jim.ryan@nrcan-rncan.gc.ca. Search for other works by this author on: GSW Google Scholar D.C. Murphy; D.C. Murphy † 2Yukon Geological Survey, PO Box 2703 (K-14), Whitehorse, Yukon Y1A 2C6, Canada †E-mails: rdstaple@sfu.ca; Donald.Murphy@gov.yk.ca; hdgibson@sfu.ca; maurice.colpron@gov.yk.ca; Rob.Berman@nrcan-rncan.gc.ca; jim.ryan@nrcan-rncan.gc.ca. Search for other works by this author on: GSW Google Scholar H.D. Gibson; H.D. Gibson † 1Department of Earth Sciences, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada †E-mails: rdstaple@sfu.ca; Donald.Murphy@gov.yk.ca; hdgibson@sfu.ca; maurice.colpron@gov.yk.ca; Rob.Berman@nrcan-rncan.gc.ca; jim.ryan@nrcan-rncan.gc.ca. Search for other works by this author on: GSW Google Scholar M. Colpron; M. Colpron † 2Yukon Geological Survey, PO Box 2703 (K-14), Whitehorse, Yukon Y1A 2C6, Canada †E-mails: rdstaple@sfu.ca; Donald.Murphy@gov.yk.ca; hdgibson@sfu.ca; maurice.colpron@gov.yk.ca; Rob.Berman@nrcan-rncan.gc.ca; jim.ryan@nrcan-rncan.gc.ca. Search for other works by this author on: GSW Google Scholar R.G. Berman; R.G. Berman † 3Natural Resources Canada, Geological Survey of Canada, 615 Booth Street, Ottawa, Ontario K1A 0E9, Canada †E-mails: rdstaple@sfu.ca; Donald.Murphy@gov.yk.ca; hdgibson@sfu.ca; maurice.colpron@gov.yk.ca; Rob.Berman@nrcan-rncan.gc.ca; jim.ryan@nrcan-rncan.gc.ca. Search for other works by this author on: GSW Google Scholar J.J. Ryan J.J. Ryan † 4Natural Resources Canada, Geological Survey of Canada, 625 Robson Street, Vancouver, British Columbia V6B 5J3, Canada †E-mails: rdstaple@sfu.ca; Donald.Murphy@gov.yk.ca; hdgibson@sfu.ca; maurice.colpron@gov.yk.ca; Rob.Berman@nrcan-rncan.gc.ca; jim.ryan@nrcan-rncan.gc.ca. Search for other works by this author on: GSW Google Scholar GSA Bulletin (2014) 126 (11-12): 1511–1530. https://doi.org/10.1130/B31037.1 Article history received: 18 Nov 2013 rev-recd: 02 Apr 2014 accepted: 12 May 2014 first online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation R.D. Staples, D.C. Murphy, H.D. Gibson, M. Colpron, R.G. Berman, J.J. Ryan; Middle Jurassic to earliest Cretaceous mid-crustal tectono-metamorphism in the northern Canadian Cordillera: Recording foreland-directed migration of an orogenic front. GSA Bulletin 2014;; 126 (11-12): 1511–1530. doi: https://doi.org/10.1130/B31037.1 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 In situ sensitive high-resolution ion microprobe monazite geochronology and garnet isopleth thermobarometry reveal a previously unrecognized Middle Jurassic to earliest Cretaceous mid-crustal tectono-metamorphic event in the eastern part of the Yukon-Tanana terrane (Finlayson Lake district, southeast Yukon) in the northern Canadian Cordillera. Intersection of garnet end-member compositional isopleths applied to single-stage, growth-zoned garnet records progressive garnet growth from 550 °C and 6.1–6.6 kbar to 600 °C and 7.5 kbar. Monazite textures, chemical zoning, and in situ U-Pb ages record a single protracted episode of monazite growth from ca. 169 to 142 Ma coeval with the development of transposition fabrics and the late stages of garnet growth. This event post-dates widespread Early Jurassic exhumation of Yukon-Tanana terrane rocks west of the Tintina fault in west-central Yukon, which were previously ductily deformed and metamorphosed in the Permo-Triassic. The lack of evidence for Permo-Triassic ductile deformation and high-grade metamorphism within the Finlayson Lake district, and its position east of the Permian arc center and west of Permian blueschists and eclogites, suggests this eastern part of the terrane occupied the cool forearc at this time. These data indicate younger, more protracted mid-crustal orogenesis in the northern Cordillera than was previously recognized, with deformation and metamorphism migrating toward the foreland and downwards in the Middle Jurassic to Early Cretaceous, in part contemporaneous with and analogous to that in the southeastern Canadian Cordillera. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.