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TitleCordilleran magmatism in Yukon and northern British Columbia: characteristics, temporal variations, and 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 R
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. 95-122, 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
NTS92I; 92J; 92K; 92L; 92M; 92N; 92O; 92P; 93; 94; 95A; 95B; 95C; 95D; 95E; 95F; 95G; 95J; 95K; 95L; 95M; 95N; 95O; 96B; 96C; 96D; 96E; 96F; 96G; 102; 103; 104; 105; 106A; 106B; 106C; 106D; 106E; 106F; 106G; 106H; 114; 115; 116A; 116B; 116C; 116F; 116G; 116H
AreaWhitehorse; Prince Rupert; Alaska; Canada; United States of America
Lat/Long WENS-148.0000 -120.0000 66.0000 54.0000
Subjectsregional geology; tectonics; geochemistry; Science and Technology; Nature and Environment; tectonic setting; tectonic history; tectonic evolution; tectonic elements; tectonic models; crustal evolution; crustal structure; magmatism; terranes; craton; plate margins; rifts; orogenesis; geochemical analyses; whole rock geochemistry; trace element geochemistry; geochemical anomalies; bedrock geology; basement geology; lithology; igneous rocks; mafic rocks; felsic rocks; ophiolites; volcanic rocks; basalts; tholeiites; intrusive rocks; peridotites; granitic rocks; diorites; granodiorites; monzo-granites; sedimentary rocks; carbonates; metamorphic rocks; eclogites; peraluminous rocks; inclusions; Canadian Cordillera; Intermontane Belt; Yukon-Tanana Terrane; Cache Creek Terrane; Atlin Terrane; Slide Mountain Terrane; Quesnellia Terrane; Stikinia Terrane; Cassiar Terrane; Laurentian Margin; Laurentia; Klondike Assemblage; Stikine Assemblage; Sulphur Creek Plutonic Suite; Klondike Schist; Buffalo Pitts Complex; Schist Creek Complex; Whitehorse Plutonic Suite; Alexander Terrane; Wrangellia Terrane; Kluane Terrane; Windy Terrane; Angayucham Terrane; Arctic Alaska Terrane; Chugach Terrane; Yakutat Terrane; Methodology; Phanerozoic; Mesozoic; Cretaceous; Paleozoic; Permian; Carboniferous; Devonian
Illustrationsgeoscientific sketch maps; ternary diagrams; geochemical plots; schematic models; photographs
ProgramGEM2: Geo-mapping for Energy and Minerals Western Cordillera
Released2021 11 25
AbstractGeochemical and temporal characterization of magmatic rocks is an effective way to test terrane definitions and to evaluate tectonic models. In the northern Cordillera, magmatic episodes are mostly interpreted as products of continental arc and back-arc settings. Re-evaluation of Paleozoic and Late Mesozoic magmatic episodes presented herein highlights fundamental gaps in the understanding of the tectonic framework of the northern Cordillera. In many cases, the character of magmatism and temporal relationships between various magma types do not support existing tectonic models. The present re-evaluation indicates that some of the magmatic episodes are best explained by lithospheric extension rather than arc magmatism. In addition, comparison to modern analogues suggests that many presently defined terranes are not the fundamental tectonic building blocks, but rather combine distinctly different tectonic elements that may not be related each other. Grouping of these distinctly different tectonic elements into single terranes hinders the understanding of Cordilleran evolution and its mineral deposits.
Summary(Plain Language Summary, not published)
This report presents an overview of magmatism in British Columbia and Yukon. It details the distribution and characteristics of the various magmatic episodes on the basis of field and laboratory analyses. It compares these data to modern analogues. The results presented herein help progress GEM2 models to ultimately redefine the regional tectonic models of the Cordillera.

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