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TitleOverview of Cordilleran oceanic terranes and their significance for the tectonic evolution of the northern Cordillera
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorZagorevski, AORCID logo; van Staal, C RORCID logo; Bédard, J H; Bogatu, A; Canil, D; Coleman, M; Golding, M; Joyce, N LORCID logo; Lawley, CORCID logo; McGoldrick, S; Mihalynuk, M G; Milidragovic, DORCID logo; Parsons, AORCID logo; Schiarizza, P
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. 21-65, Open Access logo Open Access
PublisherNatural Resources Canada
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
ProvinceBritish Columbia; Yukon
NTS104F/09; 104F/15; 104F/16; 104G/09; 104G/10; 104G/11; 104G/12; 104G/13; 104G/14; 104G/15; 104G/16; 104H/11; 104H/12; 104H/13; 104H/14; 104I/03; 104I/04; 104I/05; 104I/06; 104I/11; 104I/12; 104I/13; 104I/14; 104J; 104K; 104L; 104M; 104N; 104O; 104P/04; 104P/15; 105B/03; 105B/04; 105B/05; 105B/06; 105B/12; 105C; 105D; 105E; 105F/01; 105F/02; 105F/03; 105F/04; 105F/05; 105F/06; 105F/07; 105F/11; 105F/12; 105F/13; 105F/14; 105K/04; 105L/01; 105L/02; 105L/03; 105L/04; 105L/05; 105L/06; 105L/07; 105L/08; 115A/01; 115A/08; 115A/09; 115A/10; 115A/15; 115A/16; 115G/09; 115G/15; 115G/16; 115H; 115I/01; 115I/02; 115I/03; 115I/04; 115I/05; 115I/06; 115I/07; 115I/08; 115J/01; 115J/02; 115J/07; 115J/08
AreaWhitehorse; Carcross; Atlin; Teslin; Dease Lake
Lat/Long WENS-138.6667 -129.0000 62.5000 57.5000
Subjectstectonics; regional geology; structural geology; stratigraphy; geochemistry; Science and Technology; Nature and Environment; tectonic setting; tectonic evolution; tectonic history; crustal evolution; crustal structure; models; ophiolites; island arcs; terranes; mantle; oceanic crust; craton; plate margins; orogenesis; subduction zones; obduction; magmatism; intrusions; plutons; dykes; volcanism; accretion; rifting; sea floor spreading; deformation; sutures; stratigraphic analyses; stratigraphic nomenclature; tectonostratigraphic zones; bedrock geology; basement geology; lithology; breccias; igneous rocks; ultramafic rocks; intrusive rocks; diabases; dunites; gabbros; norites; mafic intrusive rocks; harzburgites; pyroxenites; trondhjemites; peridotites; volcanic rocks; basalts; pillow lavas; tholeiites; sedimentary rocks; carbonates; limestones; cherts; metamorphic rocks; marbles; tectonites; serpentinites; structural features; faults; geochemical analyses; trace element analyses; fossils; paleogeography; microfossils; Canadian Cordillera; Intermontane Belt; Laurentian Margin; Cache Creek Terrane; Atlin Terrane; Stikinia Terrane; Yukon-Tanana Terrane; Slide Mountain Terrane; Ancestral North America; Nakina Suite; Dozy Marmot Suite; King Mountain Suite; Nakina Formation; Kutcho Complex; Kutcho Assemblage; Kutcho Formation; Stikine Assemblage; Horsefeed Formation; French Range Formation; Teslin Formation; Three Sisters Plutonic Suite; Hazelton Group; Takwahoni Formation; Laberge Group; Inklin Formation; Nazcha Formation; Sinwa Formation; Stuhini Group; Lewes River Group; Kedahda Formation; Aksala Formation; Hancock Member; Shonektaw Formation; Tahltanian Orogeny; Joe Mountain Formation; Tsabayhe Group; Fusulinids; Nahlin Fault; King Salmon Fault; Harzburgite Peak Complex; Clinton Creek Complex; Midnight Dome Complex; Dunite Peak Complex; Cache Creek Complex; Nahlin Suite; Phanerozoic; Mesozoic; Jurassic; Triassic; Paleozoic; Permian; Carboniferous; Mississippian
Illustrationsgeoscientific sketch maps; location maps; stratigraphic charts; schematic models; photographs; geochemical plots; ternary diagrams; schematic cross-sections
ProgramGEM2: Geo-mapping for Energy and Minerals Western Cordillera
Released2021 11 25
AbstractOphiolite complexes are an important component of oceanic terranes in the northern Cordillera and constitute a significant amount of juvenile crust added to the Mesozoic Laurentian continental margin during Cordilleran orogenesis. Despite their tectonic importance, few systematic studies of these complexes have been conducted. Detailed studies of the pseudostratigraphy, age, geochemistry, and structural setting of ophiolitic rocks in the northern Cordillera indicate that ophiolites formed in Permian to Middle Triassic suprasubduction zone settings and were obducted onto passive margin sequences. Re-evaluation of ophiolite complexes highlights fundamental gaps in the understanding of the tectonic framework of the northern Cordillera. The previous inclusion of ophiolite complexes into generic 'oceanic' terranes resulted in significant challenges for stratigraphic nomenclature, led to incorrect terrane definitions, and resulted in flawed tectonic reconstructions.
Summary(Plain Language Summary, not published)
This report presents preliminary results and models developed through GEM2 program on the ancient oceanic crust in British Columbia and Yukon. It details the distribution and characteristics of the various rock packages on the basis of field and laboratory analyses. It compares these data to modern analogues. The results presented herein help progress GEM2 model to ultimately redefine the regional tectonic models of the Cordillera.

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