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TitleThe Slide Mountain ophiolite, Big Salmon Range, south-central Yukon: preliminary results from fieldwork
AuthorParsons, A J; Ryan, J J; Coleman, M; Van Staal, C R
SourceYukon Exploration and Geology 2016 ; by MacFarlane, K E (ed.); Weston, L H (ed.); Yukon Geological Survey, Yukon Exploration and Geology 2016, YEG2016 10, 2017 p. 181-196
Year2017
Alt SeriesEarth Sciences Sector, Contribution Series 20160359
PublisherYukon Geological Survey
Documentserial
Lang.English
Mediapaper
File formatpdf
ProvinceYukon
NTS105E/08; 105E/09; 105F/05; 105F/12
AreaBig Salmon Range; Dunite Peak; Slide Mountain
Lat/Long WENS-134.3333 -134.1667 62.0167 61.9167
Subjectsgeochronology; tectonics; ophiolites; klippen; models; obduction; deformation; orogenies; orogenic regions; Cordilleran orogenic evolution
Illustrationslocation maps; geological sketch maps; photographs; equal-area stereonet projections
ProgramWestern Cordillera, Redefinition of crustal blocks, GEM2: Geo-mapping for Energy and Minerals
LinksOnline - En ligne
AbstractThe Dunite Peak area of the Big Salmon Range, south-central Yukon, exposes klippen of maficultramafic strata belonging to the Slide Mountain terrane that structurally overlie metasedimentary strata of the Yukon-Tanana terrane. Previous workers also infer the suture between the allochthonous Yukon-Tanana terrane and parautochthonous Cassiar terrane close to this area. This study forms the
groundwork for a detailed investigation of the timing and kinematics of closure of the Slide Mountain ocean, and its involvement in subsequent collisions between Yukon-Tanana and Cassiar terranes. At present, a variety of tectonic models may be applied to ophiolite formation and subsequent obduction and deformation of the Slide Mountain terrane in this region. We consider these models and postulate future investigations that should be undertaken to ascertain their validity and applicability to the NW Cordilleran orogenic evolution.
Summary(Plain Language Summary, not published)
We present preliminary results from fieldwork in the Dunite Peak area of the Big Salmon Range, south-central Yukon, which include a new geological map and descriptions of bedrock map units. This area provides unprecedented exposures of blocks of oceanic crust belonging to Slide Mountain terrane (SMT) that structurally overly metamorphosed sedimentary rocks of the Yukon Tanana terrane (YTT). Previous work has also mapped the boundary between the YTT and Cassiar terrane (CT) of the North American Continent close to this area. This study forms the groundwork for a detailed investigation of the timing and mechanisms of closure of the Slide Mountain Ocean and subsequent collisions between YTT and North America. At present, a variety of tectonic models may be applied to formation of Slide Mountain ocean crust and subsequent collision and deformation of the SMT in this region. We consider these models and outline future lines of investigation that will be undertaken in order to ascertain their validity and applicability to formation of the NW Cordilleran mountain belt.
GEOSCAN ID299743