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TitleRevised tectonostratigraphy of Yukon-Tanana and Slide Mountain terrane units in the Thirtymile Range and Wolf Lake areas, southern Yukon: preliminary field results
AuthorCleven, N R; Ryan, J J; Zagorevski, AORCID logo; Hayward, NORCID logo
SourceAME Roundup 2019; 2019 p. 1
Alt SeriesNatural Resources Canada, Contribution Series 20190399
MeetingAME Roundup 2019; Vancouver, BC; CA; January 28-31, 2019
NTS105B/11; 105B/12; 105B/13; 105C/09; 105C/10; 105C/11; 105C/14; 105C/15; 105C/16
AreaThirtymile Range; Wolf Lake
Lat/Long WENS-133.1667 -131.2500 61.2500 60.5833
Subjectstectonics; stratigraphy; Science and Technology; Nature and Environment; regional geology; structural geology; geochemistry; petrogenesis; lithostratigraphy; tectonostratigraphic zones; modelling; ophiolites; bedrock geology; lithology; igneous rocks; volcanic rocks; volcaniclastics; basalts; tholeiites; intrusive rocks; sedimentary rocks; conglomerates; clastics; limestones; metamorphic rocks; metavolcanic rocks; metasedimentary rocks; provenance; structural features; folds; shearing; structural trends; tectonic history; intrusions; dykes; subduction zones; metamorphism; deformation; foliation; textural analyses; sutures; Canadian Cordillera; Yukon-Tanana Terrane; Slide Mountain Terrane; Jones Lake Formation; Finlayson Assemblage; Klinkit Assemblage; Snowcap Assemblage; Cassiar Terrane; Ancestral North America Terrane; Phanerozoic; Mesozoic; Triassic
ProgramGEM2: Geo-mapping for Energy and Minerals Western Cordillera, Devonian and Permian structural architecture
Released2019 01 28
AbstractThe nature of individual terranes, relationships between terranes, and the timing of major accretion and orogenic collision events is still poorly understood in the northern Cordillera in Yukon, British Columbia and Alaska. The study area of this work is situated to encompass units that may span a suture zone, considering that the accretion of the Yukon Tanana terrane (YTT) to the North American (NA) margin must have involved a major collisional and orogenic event. Locally, supracrustal rocks on the eastern margin of the YTT are structurally juxtaposed with the Cassiar terrane, a sliver of the ancestral NA margin, presumably along a terrane boundary that is possibly a suture zone. However, the timing, extent and products of the collision and suturing process have yet to be explicitly defined in terms of what collided, and exactly when. The presence of Slide Mountain terrane (SMT) units as potential suprasubduction ophiolite slivers, units of eclogitic rocks, and regions with a steep metamorphic gradient are indications that the study area is suitable to examine collisional tectonic and accretionary processes and effects. The general objectives of field work carried out under the Geological Survey of Canada's GEM Cordillera project in the summer of 2018 were to map the the geology of the Thirtymile range, establish the petrogenesis of Slide Mountain ophiolite fragments in the Wolf Lake region, and evaluate the nature of late conglomerate deposits.

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