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TitleGeology of the Atnarko metamorphic complex, southern Tweedsmuir Park, west-central British Columbia
AuthorIsrael, S A; Kennedy, L A
SourceGeological Survey of Canada, Current Research (Online) no. 2003-A3, 2003, 8 pages,
PublisherNatural Resources Canada
Mediaon-line; digital; CD-ROM
RelatedThis publication is contained in the following publications
File formatpdf
ProvinceBritish Columbia
NTS92M/16; 92N/13; 92N/14; 93C/03; 93C/04; 93C/05; 93C/06; 93D/01; 93D/08
AreaTweedsmuir Park; Bella Coola
Lat/Long WENS-126.2500 -125.0000 52.5000 51.7500
Subjectsigneous and metamorphic petrology; structural geology; regional geology; bedrock geology; metamorphic rocks; metamorphic facies; amphibolite facies; greenschist facies; structural features; foliation; folds; strain; igneous rocks; plutonic rocks; lithology; metamorphism; Atnarko metamorphic complex; East Waddington Thrust Belt; Jurassic; Mesozoic; Cretaceous
Illustrationssketch maps; stereonets; photographs
ProgramTargeted Geoscience Initiative (TGI-1), 2000-2003
Released2003 01 23
AbstractThe southern portion of the Atnarko metamorphic complex is characterized by west south west-directed contractional high-strain structures within middle-greenschist- to upper-amphibolitefacies metamorphic rocks and plutonic rocks. Similar rocks in the central and northern portions of the complex are characterized by southwest- and northeast-striking foliations and northwest-verging folds. The ages of structures in the south are not well constrained, but they may be as old as Middle to Late Jurassic, and possibly related to the thrusting of the Intermontane superterrane over the Insular superterrane. The foliations and folds in the central and northern areas of the complex are likely younger than Early Cretaceous, and possibly related to mid-Cretaceous thrusting associated with the East Waddington Thrust