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TitleGeology and metallogeny of the Belt-Purcell Basin
AuthorLydon, J W
SourceMineral deposits of Canada: a synthesis of major deposit-types, district metallogeny, the evolution of geological provinces, and exploration methods; by Goodfellow, W D (ed.); Geological Association of Canada, Mineral Deposits Division, Special Publication no. 5, 2007 p. 581-607
Year2007
Alt SeriesEarth Sciences Sector, Contribution Series 20070207
PublisherGeological Association of Canada, Mineral Deposits Division (St. John's, NL, Canada)
Documentserial
Lang.English
Mediapaper; DVD; digital
RelatedThis publication is contained in Goodfellow, W D; (2007). Mineral deposits of Canada: a synthesis of major deposit-types, district metallogeny, the evolution of geological provinces, and exploration methods, Geological Association of Canada, Mineral Deposits Division, Special Publication no. 5
File formatpdf
ProvinceBritish Columbia
NTS82F; 82G; 82J; 82K
AreaMontana; Idaho; southeastern British Columbia; Cranbrook; Kimberly; Kootenay; Canada; United States
Lat/Long WENS-118.0000 -110.0000 51.0000 44.0000
Subjectseconomic geology; metallic minerals; tectonics; stratigraphy; mineral occurrences; mineral deposits; mineralization; mineral potential; mineral exploration; sedimentary rocks; marine sediments; turbidites; tholeiites; sulphides; copper; cobalt; silver; basin evolution; basins; sedimentary basins; tectonic setting; faulting; metamorphism; depositional environment; lithology; hydrothermal alteration; alteration; Belt-Purcell Basin; Prichard Formation; Aldridge Formation; Sullivan Mine; Belt-Purcell Supergroup; Precambrian; Proterozoic
Illustrationssketch maps; graphs; tables; photographs
ProgramConsolidating Canada's Geoscience Knowledge
ProgramTargeted Geoscience Initiative (TGI-3), 2005-2010
AbstractThe Mesoproterozoic Belt-Purcell Basin outcrops over an area of about 200,000 km2 in Idaho, Montana, and southeastern British Columbia, and preserves an 18 to 20 km thickness of sediments that were deposited in an intracontinental rift. The Prichard (U.S.A.) and Aldridge (Canada) Formations consist of 10 to12 km of marine turbidites with intercalated tholeiitic sills and reflect a combination of high accumulation rates (>500 m/my) and magmatic activity along the axial part of the rift. Relatively small strata bound Cu-Co massive sulphide deposits in central Idaho arguably represent Besshi-type mineralization in the axial zone of the rift, but the Proterozoic metallogenic events with the greatest metal endowment are associated with basinal dewatering during the rift fill stage of basin evolution. These events produced the world-class Sullivan Zn-Pb-Ag SEDEX deposit of British Columbia, hosted by the Aldridge Formation, and the world-class Coeur d'Alene Ag-Pb vein district of Idaho, hosted by Prichard- to Revette-aged rocks. The Revette Formation, corresponding to the earliest part of the rift sag stage, also hosts the Spar Lake, Rock Creek, and Montanore Red Bed Cu deposits of Montana, which together have a proven resource of more than 330 million tonnes of approximately 0.7% Cu and 50 g/t Ag. Reports of other Proterozoic mineral deposit types, including IOCG, Cu-Ni-PGE, and rift-sag stage SEDEX deposits, suggest that the mineral potential of the Belt-Purcell Basin has not yet been fully realized.
GEOSCAN ID224196