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TitlePlutonic rocks of the eastern Bella Coola map area, southwest British Columbia
AuthorHrudey, M G; Struik, L C; Diakow, L J; Mahoney, J B; Woodsworth, G J; Sparks, H A; Kaiser, E A; Gleeson, T P
SourceGeological Survey of Canada, Current Research (Online) no. 2002-A9, 2002, 10 pages,
PublisherNatural Resources Canada
Mediapaper; on-line; digital
RelatedThis publication is contained in Geological Survey of Canada; Geological Survey of Canada; (2002). Current Research 2002, winter release, Geological Survey of Canada, Current Research no. 2002
File formatpdf
ProvinceBritish Columbia
NTS93D/07; 93D/08; 93D/09; 93D/10
AreaBella Coola
Lat/Long WENS-127.0000 -126.0000 52.7500 52.2500
Subjectsigneous and metamorphic petrology; structural geology; bedrock geology; plutonic rocks; plutons; igneous rocks; diorites; tonalites; deformation; shear zones; granodiorites; granites; gabbros; hornblendites; Salloomt Intrusive Suite; Kalone Intrusive Suite; Talcheazoone Intrusive Suite; Firvale Intrusive Suite; Four Mile Intrusive Suite; Crag Creek Intrusive Complex; intrusive suites; intrusive complex; Jurassic; Mesozoic; Cenozoic; Tertiary; Cretaceous
Illustrationssketch maps; photographs
ProgramTargeted Geoscience Initiative (TGI-1), 2000-2003
Released2002 01 22
AbstractThe abundant plutonic rocks of the eastern Bella Coola map area are mostly of intermediate composition and are interpreted as Jurassic to Eocene. They are subdivided into five intrusive suites, one intrusive complex, and several undifferentiated plutons. The Salloomt suite ((?)Jurassic) is dominated by medium-grained, hornblende-rich diorite. The Kalone suite of biotite-hornblende tonalite is involved in ductile deformation within shear zones adjacent to Jump Across Creek. The Talcheazoone suite consists of uniformly foliated quartz diorite. The Firvale suite comprises altered Early Cretaceous biotite granodiorite. The Four Mile suite comprises pristine biotite-muscovite granite; these plutons truncate a regional pattern of the northwest-trending folds and shear zones. The Crag Creek intrusive complex is diorite and gabbro cut by numerous locally sheeted dykes of granodiorite, rhyolite, basalt, and andesite. Some lens-like sills between screens of country rock may have formed along pre-existing, subvertical structures.