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TitleCross River Sills, Rocky Mountains, southeastern British Columbia
AuthorMcMechan, M; Anderson, B; Richards, B; Davis, B
Source5th Annual Minerals South Conference & Trade Show 2009, abstracts; 2017, 20 pages
Alt SeriesNatural Resources Canada, Contribution Series 20170028
PublisherEast Kootenay Chamber of Commerce
MeetingMinerals South 2009 - 5th Annual Minerals South Conference & Trade Show 2009; Cranbrook, BC; CA; October 27-30, 2009
Mediapaper; on-line; digital
RelatedThis publication is related to McMechan, M E; Anderson, R G; Richards, B C; Davis, W J; (2017). Cross River sills, Rocky Mountains, southeastern British Columbia, Geological Survey of Canada, Scientific Presentation no. 59
File formatpdf
ProvinceBritish Columbia
NTS82E; 82F; 82G; 82J; 82K; 82L; 82M; 82N; 82O
AreaCross River; Rocky Mountains; Mount Fowler; Nelson; Cranbrook; Calgary; Swanson Peak; Kananaskis; Front Ranges
Lat/Long WENS-120.0000 -114.0000 52.0000 49.0000
Subjectsgeochemistry; geochronology; geological history; thermal history; intrusions; sills; dykes; metamorphism; deformation; alteration; bedrock geology; lithology; igneous rocks; intrusive rocks; diorites; plagioclase; hornblende; mafic rocks; diatremes; breccias; volcanic rocks; ash; dacites; rhyolites; sedimentary rocks; limestones; argillites; structural features; folds; geochemical analyses; potassium; argon; fission-track dates; trace element geochemistry; major element geochemistry; minor element geochemistry; correlations; miogeoclines; Cross River Sills; Mount Docking Formation; Chancellor Group; Albert River Sills; Fenwick Creek Sills; McKay Group; Fowler Intrusive Suite; Milford Group; Clachnacudain Pluton; Omineca Belt; Exshaw Formation; Banff Formation; Fenwick Dyke; Laussedat Dyke; White River Trough; rare earth elements (REE); loss on ignition; trachyandesites; trachydacites; high field strength elements (HFSE); Phanerozoic; Cenozoic; Tertiary; Mesozoic; Cretaceous; Paleozoic; Cambrian
LinksOnline - En ligne (complete volume - volume complet, PDF, 1041 KB
AbstractDioritic sills up to 40 m thick intrude carbonates and argillites of the Mount Docking Formation (middle Chancellor Group) along the Cross River. Sills are folded with the regional structure and crosscut by numerous nearly perpendicular quartz veins that locally contain minor chalcopyrite. Contact metamorphism has extends a few metres into the host rock. Recent mapping discovered dioritic to gabbroic sills in the Mount Docking Formation along the Albert River and at Fenwick Creek. These locally contain abundant pyrrhotite and are cut by numerous barren quartz veins.
At Cross River a small zone of medium crystalline plagioclase-hornblende diorite was found and sampled for age dating. It contained no zircon. The hornblende had very low K content, excess Ar and produced highly disturbed spectra with non-interpretable results. Apatite fission track analysis indicates cooling in the early Tertiary and structural relationships require their intrusion by the Early Cretaceous. Trace element compositions help characterize sills and dykes intruding the Chancellor Group and thin sills intruding the overlying McKay Group and tuffs in the Latest Devonian Exshaw Formation.