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TitleStratigraphy and structure of the Upper Arrow Lake area, southeastern British Columbia: new perspectives for the Columbia River Fault Zone
AuthorLemieux, Y; Thompson, R I; Erdmer, P
SourceGeological Survey of Canada, Current Research (Online) no. 2003-A7, 2003, 9 pages,
PublisherNatural Resources Canada
Mediaon-line; digital; CD-ROM
RelatedThis publication is contained in the following publications
File formatpdf
ProvinceBritish Columbia
NTS82K/04; 82K/05
AreaArrow Lake; Columbia River
Lat/Long WENS-118.0000 -117.5000 50.5000 50.0000
Subjectsstratigraphy; structural geology; bedrock geology; structural features; faults; fault zones; Eocene; faults, extension; quartzites; metamorphic rocks; intrusive rocks; igneous rocks; stratigraphic analyses; batholiths; greenstones; Columbia River Fault Zone; Rodd Creek Fault; Saddle Mountain Dome; Cenozoic; Devonian; Paleozoic
Illustrationssketch maps; photographs; stereonets
ProgramAncient Pacific Margin NATMAP Project
Released2003 01 23
AbstractThe Columbia River Fault Zone in the southeastern Canadian Cordillera has been interpreted as a major Eocene crustal-scale detachment having tens of kilometres of east-side-down displacement. It is one of a family of extension faults mapped in the southeastern Cordillera and interpreted to have accommodated crustal extension during the early Tertiary (ca. 50-55 Ma). Recent field investigation has suggested that an Upper Paleozoic rock succession occurs as a semicontinuous belt from west of Vernon to east of the Columbia River Fault. This belt comprises a distinctive Devonian calcareous quartzite marker unit that can be traced across Upper Arrow Lake. Field relationships of the Columbia River Fault Zone suggest that proposed displacement on the fault is inconsistent with continuity of rock units from hanging-wall to footwall exposures. The geometry and significance of the Columbia River Fault Zone along Upper Arrow Lake may
be overstated.