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TitleGeology of the Spatsizi River map area, north-central British Columbia
AuthorEvenchick, C A; Thorkelson, D J
SourceGeological Survey of Canada, Bulletin no. 577, 2005, 276 pages; 1 CD-ROM, (Open Access)
LinksMetadata - Métadonnées
PublisherNatural Resources Canada
MapsPublication contains 14 maps
Map Info.geological, bedrock and structural geology, 1:50,000
Map Info.geological, bedrock and structural geology, 1:250,000
Map Info.geophysical, aeromagnetic, 1:250,000
Map Info.location, fossil distribution, 1:250,000
Mediapaper; CD-ROM; digital; on-line
RelatedThis publication contains the following publications
File formatreadme / lisez-moi
File formatpdf
ProvinceBritish Columbia
AreaSpatsizi River
Lat/Long WENS-130.0000 -128.0000 58.0000 57.0000
Subjectsstratigraphy; structural geology; tectonics; economic geology; paleontology; bedrock geology; igneous rocks; intrusive rocks; batholiths; plutons; sedimentary rocks; structural analysis; deformation; structural features; faults; faults, strike; faults, slip; tectonic history; tectonic evolution; lithofacies; lithostratigraphy; hydrocarbon potential; mineral potential; fossil assemblages; Bowser Basin; Skeena Fold Belt; Sustut Basin; Stikine Assemblage; Stuhini Group; Hazelton Group; Bowser Lake Group; Sustut Group; Maitland Volcanics; Railway Pluton; Stikine Batholith; Hotailuh Batholith; Spatsizi River Stock; McEwan Creek Pluton; Cartmel Stock; Black Fox Fault; Griffith Fault; Buckinghorse Fault; Brothers Peak Formation; Gladys Fault; Cold Fish Fault; Pitman Fault; Paleozoic; Triassic; Jurassic; Cretaceous; Mesozoic; Cenozoic; Quaternary; Tertiary
Illustrationssketch maps; stratigraphic sections; photographs; tables; photomicrographs; cross-sections; stereonets; block diagrams
Released2005 03 24
AbstractSpatsizi River map area is underlain by early Carboniferous to Quaternary rocks. The primary tectonostratigraphic elements are Stikinia, Bowser Basin, and Sustut Basin. The primary structural feature is the Skeena Fold Belt.

Stikinia is composed of Carboniferous to early Middle Jurassic clastic, volcanic, and intrusive rocks. It is overlain by the Bowser Lake Group, a late Middle Jurassic to mid-Cretaceous clastic overlap assemblage. The Bowser Basin resulted from closure of the Cache Creek Ocean that lay between Stikinia and Ancestral North America. Sediment was deposited in amagmatic submarine fan, slope, shelf, deltaic, and low- and high-energy fluvial environments. The distribution of fossils and lithofacies assemblages define an overall regressive basin history with facies boundaries migrating southwest, away from the Cache Creek source. A conservative minimum estimate of thickness of the group is 5000 m. The Sustut Basin is a nonmarine, fluvial basin northeast of the Bowser Basin. The Sustut Group, of Barremian, Aptian, or Albian, to early Maastrichtian age, is at least 2000 m thick. Initial deposits were mica-rich and had an eastern (Omineca Belt) source. The appearance of abundant chert clasts in the lower formation signals initiation of a western, Bowser Lake Group, source. The change in source area illustrates impact of the evolving Skeena Fold Belt, which was active in the Early and Late Cretaceous. Folds and thrust faults involve strata as low as Stikinia, and most verge northeast. The Skeena Fold Belt terminates to the northeast in a triangle zone within the Sustut Basin.