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TitleOverlap assemblages: Laberge Group of the Whitehorse Trough, northern Canadian Cordillera
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorKellett, D AORCID logo; Zagorevski, AORCID logo
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. 123-144, 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
File formatpdf
ProvinceYukon; British Columbia
NTS104K; 104M; 104N/02; 104N/03; 104N/04; 104N/05; 104N/06; 104N/07; 104N/11; 104N/12; 104N/13; 104N/14; 105C/03; 105C/04; 105C/05; 105C/06; 105C/12; 105C/13; 105D; 105E; 105L/02; 105L/03; 105L/04; 115H/01; 115H/08; 115H/09; 115H/10; 115H/15; 115H/16; 115I/01; 115I/02
AreaLake Laberge; Whitehorse; Atline Lake; Lisadele Lake
Lat/Long WENS-137.0000 -132.0000 62.2500 58.0000
Subjectsregional geology; tectonics; geochronology; stratigraphy; Science and Technology; Nature and Environment; tectonic setting; geological history; depositional history; tectonic history; thermal history; burial history; troughs; terranes; accretion; orogenesis; metamorphism; deformation; erosion; intrusions; sedimentary basins; basin evolution; sedimentation; bedrock geology; lithology; sedimentary rocks; conglomerates; metamorphic rocks; structural features; folds; faults; faults, thrust; faults, strike-slip; clasts; provenance; source rocks; source areas; detrital minerals; zircon; rutile; muscovite; biotite; apatite; mica; depositional environment; radiometric dating; uranium lead dating; argon argon dating; geothermal gradient; temperature; models; Canadian Cordillera; Intermontane Belt; Whitehorse Trough; Laberge Group; Stikinia Terrane; Kutcho Arc; Stuhini Group; Lewes River group; Cache Creek Terrane; Quesnellia Terrane; Yukon-Tanana Terrane; Slide Mountain Terrane; Laurentian Margin; Tantalus Formation; Bowser Lake Group; King Salmon Fault; Nahlin Fault; Teslin Fault; Aksala Formation; Mandanna Member; Phanerozoic; Mesozoic; Cretaceous; Jurassic; Triassic
Illustrationslocation maps; geoscientific sketch maps; stratigraphic sections; schematic representations; pie charts; frequency distribution diagrams; plots; tables; models
ProgramGEM2: Geo-mapping for Energy and Minerals Western Cordillera
Released2021 11 25
AbstractThe Laberge Group was deposited during the Early to Middle Jurassic in a marginal marine environment, in the northern Canadian Cordillera. It occurs as a narrow, elongated siliciclastic unit along more than 600 km of strike length, overlapping the Intermontane terranes of southern Yukon and northwestern British Columbia. The Laberge Group was deposited on the Late Triassic Stuhini and Lewes River groups, a volcano-plutonic complex of the Stikine terrane (Stikinia), and, locally, the Kutcho Arc. It is overlain by Middle Jurassic to Cretaceous clastic units. The variations in clast composition and detrital zircon populations among these units indicate major changes in depositional environment, basin extent, and sources during the latest Triassic to Middle Jurassic. Detrital zircon populations are dominated by near contemporary Stuhini-Lewes River arc grains, consistent with dissection of an active arc. Detrital rutile and muscovite data show rapid cooling and exhumation of metamorphic rocks during the Early Jurassic. Thermochronological data indicate that basin thermal evolution was domainal, with at least five regional temperature-time histories.
Summary(Plain Language Summary, not published)
This chapter summarizes the current state of knowledge of Jurassic (201-145 million year old) sedimentary rocks in the northern Canadian Cordillera mountain belt. In particular, we focus on new information from the Geo-mapping for Energy and Minerals (GEM) program and others on the ages of different types of detrital minerals and rocks that have eroded from older rocks, and ended up in the sedimentary layers. We also discuss new GEM data on how the sedimentary rocks were buried and heated after their deposition. We discuss outstanding questions about how these sedimentary rocks formed, and identify future research directions.

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