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TitleStructural geology of the eastern Bella Coola map area, southwest British Columbia
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AuthorMahoney, J B; Struik, L C; Diakow, L J; Hrudey, M G; Woodsworth, G J
SourceGeological Survey of Canada, Current Research (Online) no. 2002-A10, 2002, 9 pages, https://doi.org/10.4095/213076
Year2002
PublisherNatural Resources Canada
Documentserial
Lang.English
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
AreaBella Coola
Lat/Long WENS-128.0000 -126.0000 53.0000 52.0000
Subjectsstructural geology; igneous and metamorphic petrology; bedrock geology; plutonic rocks; plutons; igneous rocks; tonalites; deformation; shear zones; granites; faults; faults, thrust; folds; Monarch Sequence; Hazelton Group; extential deformation; contractional deformation; transpressional deformation; Jurassic; Mesozoic; Cenozoic; Tertiary; Cretaceous
Illustrationssketch maps; photographs
ProgramTargeted Geoscience Initiative (TGI-1), 2000-2003
Image
Released2002 01 22
AbstractRocks of the eastern Bella Coola (NTS 93 D) map area record several distinct deformational events representing episodic extension, contraction, and transpression in the region. Extension may have been coeval with the generation of volcanic sequences of the Jurassic Hazelton Group and Lower Cretaceous Monarch sequence. Lower Cretaceous Monarch sequence rocks exhibit tight, northeast-vergent folds and minor thrust faults. This contractional belt is cut by ductile protomylonitic to mylonitic transpressional shear zones (10-1000 m wide) that affect most rocks in the western portion of the mapped area, and are themselves cut by various granite and tonalite bodies. Brittle faults cut all rocks of the area and form prominent, north-south-trending topographic linear features.
GEOSCAN ID213076