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Title2016 report of activities for ancient faults and their controls on mineralization in northern British Columbia and southern Yukon: GEM2 Cordillera Project
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorRyan, J J; Parsons, A JORCID logo; Israel, S A; Haggart, J W; Joyce, N L; Kellett, D AORCID logo
SourceGeological Survey of Canada, Open File 8139, 2016, 19 pages, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is related to the following publications
File formatpdf
NTS115F; 115H; 115I; 115J; 115K; 115N; 115O
AreaLadue River; 60 Mile River; Yukon River; Klaza River; Dunite Peak; Ross River
Lat/Long WENS-141.0000 -131.0000 64.0000 61.5000
Subjectseconomic geology; structural geology; faults; structural features; mineralization; mineral potential; exploration proposals; mineral exploration; gold; structural interpretations; structural analyses; Mount Nansen gold mine; Klaza mineral deposit; Slide Mountain Terrane; Rapid River Tectonite; Indian River Formation; Paleozoic; Mesozoic; Triassic
Illustrationslocation maps; photographs
ProgramGEM2: Geo-mapping for Energy and Minerals Western Cordillera, Redefinition of crustal blocks
Released2016 10 24
This open file report present preliminary findings of geological fieldwork carried out under the crustal blocks activity of the GEM2 Cordillera project. We report on a 2 week mapping project in the Klaza River area that improved on reconnaissance mapping completed in the 1970's. This work modernizes understanding of the regional geology of this important area that hosts the now closed Mount Nansen gold mine, and the recently discovered Klaza mineral deposit. Detailed mapping was carried out in the Dunite Peak area of the Big Salmon Range to study a classic example of a rock assemblage believed to have represent part of the Earth's mantle from Paleozoic times, and reconcile its role in the tectonic evolution of the Canadian Cordillera. We report on a detailed examination of an important thrust fault (Yukon River thrust) that may have been responsible for Cordilleran mountain building and stacking within terranes back in latest Triassic time (i.e. 200 million years ago). We report on collaborative work across the Yukon and Alaska border to reconcile the extent of an important geological unit known regionally as the Klondike assemblage; thought to be an important source rock of placer gold in the region. We also provide an update of research on Cretaceous and younger clastic sedimentary strata of south-central and western Yukon that will help provide constraints on the tectonic setting of sedimentation that took place in northern Cordillera ca. 100-70 million years ago, which is currently poorly understood.
Summary(Plain Language Summary, not published)
This open file report presents a summary of 2016 work in the northwestern Cordillera (NW BC and SW Yukon) that was focused on establishing constraints on major crustal breaks within and between two major geological terranes. Field work was carried out in the Klaza River area of SW Yukon, along the Yukon River and in the Stewart River area of west central Yukon. Representative rock samples collected, and some samples were collected for specific analysis for geochemical signatures, and age dating that will help generate new tectonic models of the northern cordillera, and help guide mineral exploration for structurally hosted gold targets. Sections of the report give updates on the study of a younger sedimentary sequence of rocks that provide timing constraints on the later part of the tectonic evolution of the Yukon.

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