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TitleNew geological mapping in Yukon-Tanana terrane near Thistle Creek, Stewart River map area, Yukon Territory
AuthorRyan, J J; Gordey, S P
SourceGeological Survey of Canada, Current Research (Online) no. 2001-A2, 2001, 24 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
AreaCordillera; Stewart River; Thistle Creek
Lat/Long WENS-139.5000 -139.0000 63.2500 63.0000
Subjectsigneous and metamorphic petrology; structural geology; regional geology; tectonics; economic geology; metavolcanic rocks; metasedimentary rocks; volcaniclastics; plutonic rocks; orthogneisses; gneisses; schists; amphibolites; limestones; deformation; foliation; folds; faults; metamorphism; tectonic setting; mineral potential; Yukon-Tanana Terrane; Yukon Group; Jurassic; Triassic; Permian; Carboniferous; Paleozoic
Illustrationssketch maps; photographs
ProgramAncient Pacific Margin NATMAP Project
Released2001 01 01
AbstractThe Thistle Creek map area (NTS 115-O/3), in the Stewart River area, Yukon Territory, is underlain by poly- deformed and metamorphosed Paleozoic rocks of the Yukon-Tanana terrane, and younger plutonic rocks. Two fault-bounded tectonostratigraphic associations dominate the map: 1) polyphase grey orthogneiss in garnet- amphibolite schist-gneiss, interpreted herein as a metavolcano-plutonic complex; 2) interstratified garnet- amphibolite schist-gneiss and metasedimentary schist and paragneiss derived from psammite, semipelite and quartz-arenite, collectively interpreted as a metavolcano-sedimentary succession. Grey and white banded quartzite beds are generally in fault contact with the gneiss and schist units, and their stratigraphic relationships are equivo- cal. Recognition of this area as an extensive metavolcanic terrane has significant implications for the economic potential of this area. Primary stratigraphy is obscured by an intense transposition deformation, and later, open folds and faults. Regional correlations of plutonic suites indicate that the transposition event was post-Carboniferous and pre-Jurassic.