Sunday 20th September 2020

Resource Clips

Blue River site visit open to Resources for Future Generations participants

(From the B.C. Geological Survey)

Upper Fir carbonatite-hosted Nb-Ta deposit in the Blue River area, east-central British Columbia


Friday, June 22 to Sunday, June 24

Sponsored by the Mineralogical Association of Canada

Leaders: Alexei S. Rukhlov (British Columbia Geological Survey) and Thomas C. Chudy (Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia)

Cost: $1160. Includes transportation, accommodation, meals and guidebook.

(This site visit is open to registered participants of Resources for Future Generations 2018 in Vancouver.)

Widespread Late Paleozoic carbonatites in the Canadian Cordillera are unusual. In contrast to most carbonatites, which are restricted to intracratonic regions, they were emplaced in a more active setting, along the western margin of Laurentia. The Upper Fir carbonatite complex (330 Ma) hosts one of the largest Nb-Ta deposits in the Cordillera, with unusual, Ta-rich pyrochlore associated with ferrocolumbite, other Nb minerals, and locally coarse molybdenite.

Upper Fir carbonatite-hosted Nb-Ta deposit in the Blue River area, east-central British Columbia

Participants will examine drill-core sections and outcrops of metacarbonatites, related metasomatic rocks, syntectonic pegmatites, enclosing (semi)pelites and amphibolites of the Mica Creek assemblage (750-550 Ma) and Mesozoic-Cenozoic structures related to the Cordilleran orogeny. We will consider the tectono-metamorphic overprinting of igneous features in the Upper Fir carbonatites, as recorded by paragenetic relationships, mineral chemistry, recrystallization and retrograde mylonitization.

Stops along the route from Vancouver to Blue River will offer participants the opportunity to observe key outcrops representing several Cordilleran terranes. A helicopter will ferry participants from the North Thompson valley to the deposit. Participants should be prepared for inclement weather and to walk about 2 km on rugged trails and excavated sites.

For more information please contact Alexei Rukhlov (British Columbia Geological Survey):

See more Resources for Future Generations field trips.

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