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TitleGeology and structure of the Barbour Bay region, District of Keewatin, Northwest Territories, and its potential for industrial garnets
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorTella, S; Mader, U; Schau, M
SourceCanadian Shield/Bouclier canadien; by Geological Survey of Canada; Geological Survey of Canada, Current Research no. 1995-C, 1995 p. 27-34, https://doi.org/10.4095/202902 Open Access logo Open Access
Year1995
PublisherNatural Resources Canada
Documentserial
Lang.English; French
Mediapaper; on-line; digital
RelatedThis publication is contained in Canadian Shield
File formatpdf
ProvinceNunavut
NTS55N/09
AreaBarbour Bay
Lat/Long WENS-92.3417 -92.0000 63.6667 63.5500
Subjectsigneous and metamorphic petrology; industrial minerals; lithology; Archean; garnets; structural interpretations; structural features; schists; metavolcanic rocks; metamorphic rocks; amphibolite facies; metamorphism; mineral assemblages; pressure-temperature conditions; Precambrian
Illustrationssketch maps; photographs
Released1995 01 01
AbstractArchean supracrustal rocks in the Barbour Bay region form a northeast-trending, synformal remnant within a granitoid gneiss terrane. They are composed of a conformable sequence of mafic metavolcanic rocks and semipelitic schists that are deformed and metamorphosed under amphibolite facies conditions. The semipelitic rocks contain garnet±biotite±cordierite±sillimanite+plagioclase+quartz assemblages. Interlayers of garnetite with up to 80% garnet porphyroblasts, and sillimanite-rich layers are common within the schists. They reflect highly Al- and Fe-rich compositions of a metasedimentary protolith. P-T estimates for metamorphism are in the order of 2.8-3.6 kb and 520°C-650°C. The garnetite layers appear to offer a potential source of industrial garnets. The garnets occur in three forms (idiomorphic glassy, idiomorphic dull, poikiloblastic), and contain 70-90 mol% almandine, 5-12 mol% pyrope, and 2-8 mol% grossular. Further work is necessary to determine the grade, tonnage, milling and separation characteristics, abrasive quality of different garnet-types, and the commercial viability of the potential deposit.
GEOSCAN ID202902

 
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