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TitleArchitecture of pericratonic Yukon-Tanana terrane in the northern Cordillera
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorRyan, J J; Zagorevski, AORCID logo; Cleven, N R; Parsons, A JORCID logo; Joyce, N L
SourceNorthern Cordillera geology: a synthesis of research from the Geo-mapping for Energy and Minerals program, British Columbia and Yukon; by Ryan, J J (ed.); Zagorevski, AORCID logo (ed.); Geological Survey of Canada, Bulletin 610, 2021 p. 67-93, https://doi.org/10.4095/326062 Open Access logo Open Access
Year2021
PublisherNatural Resources Canada
Documentserial
Lang.English
Mediaon-line; digital
RelatedThis publication is contained in Northern Cordillera geology: a synthesis of research from the Geo-mapping for Energy and Minerals program, British Columbia and Yukon
RelatedNRCan photo(s) in this publication
File formatpdf
ProvinceYukon
NTS95D; 105A; 105B; 105C; 105D; 105E; 105F; 105G; 105H; 105J; 105K; 105L; 105M; 115; 116B; 116C
AreaDawson; Whitehorse; McQuesten; Stevenson Ridge; Klaza River; Mount Nansen; Nisling River; Thirtymile Range; Wolf Lake
Lat/Long WENS-141.0000 -126.0000 65.0000 60.0000
Subjectsregional geology; structural geology; stratigraphy; tectonics; geochronology; Science and Technology; Nature and Environment; tectonic history; tectonic evolution; crustal structure; crustal evolution; crustal thickness; plate margins; terranes; craton; metamorphism; metamorphism, regional; deformation; strain; magmatism; intrusions; plutons; sutures; orogenesis; faulting; thermal history; ophiolites; bedrock geology; basement geology; lithology; mafic rocks; ultramafic rocks; igneous rocks; intrusive rocks; peridotites; granitic rocks; volcanic rocks; metamorphic rocks; schists; amphibolite facies; metasedimentary rocks; quartzites; marbles; metavolcanic rocks; metafelsites; structural features; faults; faults, thrust; faults, strike-slip; faults, normal; shear zones; klippen; decollement; tectonostratigraphic zones; radiometric dating; uranium lead dating; zircon dates; Canadian Cordillera; Cordilleran Orogen; Intermontane Belt; Yukon-Tanana Terrane; North American Craton; Laurentian Margin; White River Assemblage; Scottie Creek Formation; White River Complex; Mount Baker Suite; Australia Mountain Domain; Snowcap Assemblage; Finlayson Assemblage; Simpson Range Suite; Klondike Assemblage; Klondike Schist; Sulphur Creek Suite; Buffalo Pitts Complex; Schist Creek Complex; Slide Mountain Terrane; Moose Creek Fault; Harzburgite Peak Complex; Dunite Peak Complex; Clinton Creek Complex; Midnight Dome Complex; Wolf Lake Complex; Inconnu Thrust; Australia Creek Fault; Willow Lake Fault; Yukon River Shear Zone; Schist Creek Fault; Denali Fault; Slide Mountain Ocean; Tintina Fault; Phanerozoic; Mesozoic; Cretaceous; Jurassic; Triassic; Paleozoic; Permian; Carboniferous; Mississippian; Devonian; Precambrian
Illustrationslocation maps; geoscientific sketch maps; photographs; plots; block diagrams
ProgramGEM2: Geo-mapping for Energy and Minerals Western Cordillera
Released2021 11 25
AbstractWest-central Yukon and eastern Alaska are characterized by widespread metamorphic rocks that form part of the allochthonous, composite Yukon-Tanana terrane and parautochthonous North American margin. Structural windows through the Yukon-Tanana terrane expose parautochthonous North American margin in that broad region, particularly as mid-Cretaceous extensional core complexes. Both the Yukon-Tanana terrane and parautochthonous North American margin share the same Late Devonian history, making their discrimination difficult; however, distinct post-Late Devonian magmatic and metamorphic histories assist in discriminating Yukon-Tanana terrane from parautochthonous North American margin rocks. The suture between Yukon-Tanana terrane and parautochthonous North American margin is obscured by many episodes of high-strain deformation. Their main bounding structure is probably a Jurassic to Cretaceous thrust, which has been locally reactivated as a mid-Cretaceous extensional shear zone. Crustal-scale structures within composite Yukon-Tanana terrane (e.g. the Yukon River shear zone) are commonly marked by discontinuous mafic-ultramafic complexes. Some of these complexes represent orogenic peridotites that were structurally exhumed into the Yukon-Tanana terrane in the Middle Permian.
Summary(Plain Language Summary, not published)
This Bulletin presents highlights of the research on the Yukon-Tanana terrane carried out under the auspices of the Cordillera project, Geo-mapping for Energy and Minerals program. This work focused on establishing age constraints on the internal components and major tectonic boundaries within and between the Yukon-Tanana terrane and the North American craton. This contribution puts into perspective the large amount of analytical data collected during the Cordillera project, and presents a simple tectonic model of the structural relationship between the Yukon-Tanana terrane and the North American craton.
GEOSCAN ID326062

 
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