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TitleGlacial history and drift prospecting in the Canadian Cordillera: recent developments
AuthorPlouffe, A; Ferbey, T; Levson, V M; Bond, J
SourceProspectors and Developers Association Convention (PDAC), abstracts volume; by Prospectors and Developers Association of Canada; 2012.
Alt SeriesEarth Sciences Sector, Contribution Series 20110284
MeetingProspectors and Developers Association Convention (PDAC); Toronto, ON; CA; March 4-8, 2012
RelatedThis publication is related to Plouffe, A; Ferbey, T; Levson, V M; Bond, J D; (2012). Glacial history and drift prospecting in the Canadian Cordillera: recent developments, Geological Survey of Canada, Open File 7261
ProvinceBritish Columbia; Yukon
NTS95C; 95D; 95E; 105; 115; 116B/01; 116B/02; 116B/03; 116B/04; 82F/03; 82E/13; 82L/04; 82L/05; 82L/12; 82M/04; 82M/05; 92H/07; 92H/15; 92H/16; 92I; 92L; 92O/05; 92O/12; 92P; 93B/04; 93B/05; 93C/01; 93C/08; 93C/09; 93C/16; 93E/14; 93E/15; 93F; 93H/04; 93H/05; 93J/05; 93J/06; 93J/11; 93J/12; 93J/13; 93J/14; 93K; 93L/01; 93L/03; 93L/09; 93L/16; 93M/01; 93M/02; 93M/07; 93M/08; 93N; 93O/04; 94G; 94I/09; 94I/10; 94I/11; 94I/12; 94I/13; 94I/14; 94I/15; 94I/16; 104B/11
AreaCanadian Cordillera; Tintina Trench; Grew Creek; Anvil; Faro; Finlayson Lake; Kudz Ze Kayah; Glenlyon; Clear Lake; Dawson; Selwyn; Anniv; Newman Peninsula; Babine Lake; Kamloops; Bonaparte Lake
Lat/Long WENS-141.0000 -124.0000 64.2500 60.0000
Lat/Long WENS-128.0000 -116.0000 60.0000 49.0000
Subjectssurficial geology/geomorphology; surficial geology/geomorphology; drift prospecting; ice flow; ice movement directions; dispersal patterns; glacial deposits; tills; mineral potential; glacial landforms; gold; silver; lead; zinc; copper; Cordilleran Ice Sheet; Iron Mask Batholith; Faro Mine; Clear Lake SEDEX deposit; Wolf prospect; Lone Star property; Gibraltar Mine; Highland Valley Mine; Bell Mine; indicator minerals; Quaternary; Quaternary
ProgramTargeted Geoscience Initiative (TGI-4), Intrusion/Porphyry Ore Systems
AbstractFor more than 20 years, provincial, territorial and federal geological surveys have implemented surficial geology and glacial sediment (till) sampling surveys within the Canadian Cordillera with the main objectives of using drift prospecting methods to evaluate the mineral potential of regions covered by glacial sediments. The surveys were completed by processing the till samples for geochemical analyses and tracing the bedrock source of anomalies in the up-ice flow direction. Several mineral exploration targets have been identified by these surveys and followed-up by mineral exploration companies. The success of these surveys and subsequent follow-up relies on reconstructed ice-flow histories based on mapping of glacial sediments and ice-flow indicators varying from landform (e.g. drumlins) to outcrop (e.g. striae) scales.
During the last glacial maximum (LGM), the Canadian Cordillera was covered by the Cordilleran Ice Sheet (CIS) which was thick enough to flow across high summits in both the Rocky and Coast mountains. The position of ice source regions and ice-divides changed during the last glaciation such that ice-flow directions at LGM were different than in early and late glacial times. Northwest Yukon did not receive sufficient precipitation for extensive glacial ice build-up. The CIS left a clear foot print on the landscape including glacial landforms and thick successions of glacial sediments.
Recent developments and current research in the application of this drift prospecting methodology include: 1) the recognition of multiple ice-flow directions (including flow reversals) and associated glacial dispersal patterns, 2) the study of indicator minerals in sediments which could be traced to fertile mineralized bedrock sources, 3) recognition of mineral-rich dispersal trains in areas of thick till (> 30 m thick), and 4) the implementation of surficial sediment sampling strategies for the unglaciated landscape of northwest Yukon.