GEOSCAN Search Results: Fastlink


TitleGeology and structure of the Barbour Bay region, District of Keewatin, Northwest Territories, and its potential for industrial garnets
DownloadDownload (whole publication)
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, Open Access logo Open Access
PublisherNatural Resources Canada
Lang.English; French
Mediapaper; on-line; digital
RelatedThis publication is contained in Canadian Shield
File formatpdf
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.

Date modified: