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TitleLower Cretaceous stratigraphy and tectonics of eastern Bella Coola map area, southwest British Columbia
AuthorStruik, L C; Mahoney, J B; Hrudey, M G; Diakow, L J; Woodsworth, G J; Haggart, J W; Poulton, T P; Sparks, H A; Kaiser, E A
SourceGeological Survey of Canada, Current Research (Online) no. 2002-A11, 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/10; 93D/07
AreaBella Coola
Lat/Long WENS-127.0000 -126.5000 52.7500 52.2500
Subjectsstratigraphy; tectonics; bedrock geology; plutonic rocks; igneous rocks; tectonostratigraphic zones; stratigraphic correlations; basalts; andesites; rhyolites; sandstones; slates; siltstones; conglomerates; stratification; sedimentary rocks; volcaniclastics; volcanic rocks; Monarch Sequence; Hazelton Group; Mesozoic; Cretaceous
Illustrationssketch maps; photographs
ProgramTargeted Geoscience Initiative (TGI-1), 2000-2003
Released2002 01 22
AbstractLower Cretaceous stratigraphic units in the study area consist mainly of flows and fragmental rocks that include basalt and andesite, minor rhyolite and dacite, and epiclastic intervals of sandstone, slate, siltstone, and conglomerate. These rocks are correlated with the Monarch volcanic rocks widespread to the southeast, lie nonconformably on Early Cretaceous plutons, and are interpreted to be deposited onto older plutonic suites. The Cretaceous succession may have formed during east-west crustal extension, and later was tightly to isoclinally and asymmetrically folded to the northeast. The succession appears to have been deposited on an Early Cretaceous topographic high that had sufficient relief to host marine basins and adja-cent subaerial hills. The Hazelton Group appears to be absent beneath the Cretaceous succession. Known mineralization (primarily copper) in the Cretaceous volcano-sedimentary rocks is mainly associated with pluton contacts or fault zones. The slate units almost everywhere have minor disseminated pyrite.