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TitleBasement complex, Carboniferous magmatism and Paleozoic deformation in Yukon-Tanana terrane of central Yukon: field, geochemical and geochronological constraints from Glenlyon map area
AuthorColpron, M; Mortensen, J K; Gehrels, G E; Villeneuve, M
SourcePaleozoic evolution and metallogeny of pericratonic terranes at the Ancient Pacific Margin of North America, Canadian and Alaskan Cordillera; by Colpron, M (ed.); Nelson, J L (ed.); Geological Association of Canada, Special Paper 45, 2006 p. 131-151; 1 CD-ROM
Alt SeriesEarth Sciences Sector, Contribution Series 20060156
PublisherGeological Association of Canada
Mediapaper; CD-ROM; digital
File formatpdf (Adobe Acrobat Reader); xls (Microsoft Excel)
NTS105L; 115I/09; 115I/16
AreaGlenlyon area; Little Salmon Lake; Diamain Lake; Tatlmain Lake; Canada
Lat/Long WENS-136.5000 -134.0000 63.0000 62.0000
Subjectsgeneral geology; geochemistry; geochronology; igneous and metamorphic petrology; structural geology; tectonics; regional geology; basement geology; magmatic arcs; volcanism; rifting; deformation; crustal uplift; magmatism; plutons; metasedimentary rocks; metamorphism; orogenesis; orogenies; metavolcanic rocks; batholiths; zircon; uranium lead dates; uranium lead dating; volcanic rocks
Illustrationslocation maps; geological sketch maps; cross-sections, structural; tables; photographs; photomicrographs; geochemical plots
ProgramYukon Geological Survey, Funding Program
ProgramTargeted Geoscience Initiative (TGI-3), 2005-2010
ProgramAncient Pacific Margin NATMAP Project
AbstractNew field, geochemical and geochronological data indicate that Yukon-Tanana terrane in central Yukon, southwest of Tintina fault, records development of a series of Carboniferous arc edifices built upon a continentally-derived metasedimentary basement, the Snowcap complex. Arc volcanism was punctuated by episodes of arc rifting, intra-arc deformation and local uplift and erosion. The Snowcap complex consists predominantly of metaclastic rocks and has experienced a more complex deformational and metamorphic history than overlying Upper Devonian - Carboniferous strata. It is unconformably overlain by the Drury and Pelmac formations. A first cycle of arc magmatism is recorded by plutonic and supracrustal rocks of the ca. 349-343 Ma Little Kalzas arc, which is coeval with development of the Wolverine back-arc in the Finlayson Lake district, northeast of Tintina fault. Rocks of the Little Kalzas arc were deformed and metamorphosed before intrusion of the Tatlmain batholith at ca. 340 Ma. Taltmain batholith is the subvolcanic root of the ca. 340 Ma and younger Little Salmon formation to the south, which consists of volcaniclastic rocks that pass laterally into alkali basalt of within-plate affinity, a transition inferred to indicate rifting of the arc system. To the east, Yukon-Tanana terrane is juxtaposed with Cassiar terrane along the Tummel fault zone, a belt of imbricate fault slices which include Permian chert and basalt akin to Slide Mountain terrane, and Triassic (?) synorogenic clastic rocks.

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