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TitleLate cenozoic geology, Ancient Pacific Margin NATMAP Project, report 4: paleomagnetic and geomorphic evidence for Brunhes-age volcanism, Fort Selkirk and Rosebud Creek area, Yukon Territory
AuthorHuscroft, C A; Barendregt, R W; Jackson, L E, Jr
SourceGeological Survey of Canada, Current Research (Online) no. 2001-A4, 2001, 15 pages, (Open Access)
PublisherNatural Resources Canada
Mediapaper; on-line; digital
RelatedThis publication is contained in Geological Survey of Canada; (2001). Current Research 2001, winter release, Geological Survey of Canada, Current Research no. 2001
File formatpdf
NTS115I; 115N
AreaFort Selkirk; Rosebud Creek; Cordillera; Yukon River Valley; Holbrook Creek; Carmacks
Lat/Long WENS-138.0000 -136.0000 63.0000 62.0000
Lat/Long WENS-142.0000 -140.0000 64.0000 63.0000
Subjectssurficial geology/geomorphology; stratigraphy; economic geology; paleomagnetic interpretations; volcanism; lava flows; pillow breccias; basalts; gravels; Pleistocene; gold; placer deposits; sedimentary facies; Selkirk Volcanic Group; Cenozoic
Illustrationssketch maps; stratigraphic sections
ProgramAncient Pacific Margin NATMAP Project
Released2001 01 01
AbstractNormally magnetized, valley-filling basalt flows extend more than 10 km down the Yukon River valley from the Fort Selkirk area. These flows are locally overlain by gravel and terminate at the level of the contemporary Yukon River flood plain, suggesting a middle to late Pleistocene age for this previously unrecognized eruptive event. Unlike other valley-filling phases of the Selkirk Volcanic Group, this eruption postdates the Pliocene to early Pleistocene pre-Reid glaciations. Normal magnetism was also determined for basalt flows underlying terraces in the area of theRosebud Creek-Grand Valley Creek confluence, 60 km to the northwest of the Fort Selkirk area. Based on their unique geomorphic and stratigraphic settings, the Rosebud basalt flows may represent yet another period of Pleis- tocene volcanism which predates one of the pre-Reid glaciations in the central Yukon Territory.