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TitleReport of activities, 2017: Dunite Peak area, Big Salmon Range, south-central Yukon: GEM2 Cordillera Project
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AuthorParsons, A J; Ryan, J J; Coleman, M
SourceGeological Survey of Canada, Open File 8307, 2017, 10 pages, https://doi.org/10.4095/305966
Year2017
PublisherNatural Resources Canada
Documentopen file
Lang.English
Mediaon-line; digital
RelatedThis publication is related to Parsons, A J; Ryan, J J; Coleman, M; van Staal, C; (2016). 2016 report of field activities in the Dunite Peak area, Big Salmon Range, south central Yukon: GEM2 Cordillera Project, Geological Survey of Canada, Open File 8133
File formatpdf
ProvinceYukon
NTS115F
AreaDunite Peak; Big Salmon Range
Lat/Long WENS-134.0000 -132.0000 62.0000 61.0000
Subjectsregional geology; structural geology; tectonics; stratigraphy; bedrock geology; lithology; igneous rocks; ophiolites; oceanic lithosphere; intrusive rocks; gabbros; leucogabbros; volcanic rocks; basalts; metasedimentary rocks; marbles; sedimentary rocks; cherts; limestones; clastics; metamorphic rocks; greenstones; structural features; faults, normal; faults, thrust; faults, strike-slip; structural trends; structural interpretations; structural analyses; tectonic history; tectonic environments; tectonic setting; tectonic interpretations; deformation; accretion; crustal structure; basins; island arcs; terranes; petrogenesis; stratigraphic analyses; Canadian Cordillera; Slide Mountain terrane; Yukon-Tanana terrane; North American Craton; Slide Mountain Ocean; Dunite Peak Ophiolite; siliciclastic rocks; Phanerozoic; Mesozoic; Cretaceous; Jurassic; Triassic
Illustrationslocation maps; geoscientific sketch maps; photographs
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Location
 
Natural Resources Canada Library - Ottawa (Earth Sciences)
 
ProgramWestern Cordillera, Devonian and Permian structural architecture, GEM2: Geo-mapping for Energy and Minerals
Released2017 10 17
Abstract(Summary)
This open file report outlines the 2017 field activities conducted in the Dunite Peak area of the Big Salmon Range, south central Yukon (Figure 1), as part of the Geo-mapping for Energy and Minerals (GEM-2) program Cordillera project. Following from 2016 field activities in the same region, targeted bedrock geological mapping and sampling was conducted to test new hypotheses and gain better understanding of the deformation processes responsible for the tectonic assembly of the NW Cordillera and the timing of specific events during collision with and accretion to the North American craton.
The NW Cordillera is composed of multiple crustal blocks which formed volcanic islands (island arcs) west of the North American continent between the Devonian to Jurassic periods. Prior to their accretion, these islands were separated from the continent by an intervening ocean basin; Slide Mountain Ocean (SMO) (Fig. 2). During the Triassic - Cretaceous, these blocks or 'terranes' collided with the North American continent craton to produce the NW Cordilleran mountain system. In the Dunite Peak area, remnants of oceanic rocks belonging to the SMO are preserved structurally on top of the Yukon-Tanana terrane (YTT). The aim of this study is to characterize the structural relationships between the Slide Mountain and Yukon-Tanana terranes to better understand the early formation of the SMO and the deformation processes that occurred during closure of this ocean, and terrane accretion to the North American continent. The results of 2017 field activities provide a clearer picture of the petrogenesis of the Dunite Peak ophiolite and allow for completion of a geological map for the area.
Summary(Plain Language Summary, not published)
This open file report outlines the 2017 field activities conducted in the Dunite Peak area of the Big Salmon Range, south central Yukon, as part of the Geo-mapping for Energy and Minerals (GEM-2) program Cordillera project. This project aims to test new hypotheses and gain better understanding of the of how the mountainous regions of western Canada (the NW Cordillera) formed. The results of 2017 field activities with an accompanying geological map are outlined and interpreted in the context of the NW Cordillera. These results provide a clearer picture of the formation of the SMO in south central Yukon and the early deformation history of the NW Cordillera.
GEOSCAN ID305966