| Title | Geology and structure of the Barbour Bay region, District of Keewatin, Northwest Territories, and its potential for industrial garnets |
| Download | Download (whole publication) |
| |
| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Tella, S; Mader, U; Schau, M |
| Source | Canadian 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 |
| Year | 1995 |
| Publisher | Natural Resources Canada |
| Document | serial |
| Lang. | English; French |
| Media | paper; on-line; digital |
| Related | This publication is contained in Canadian Shield
|
| File format | pdf |
| Province | Nunavut |
| NTS | 55N/09 |
| Area | Barbour Bay |
| Lat/Long WENS | -92.3417 -92.0000 63.6667 63.5500 |
| Subjects | igneous 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 |
| Illustrations | sketch maps; photographs |
| Released | 1995 01 01 |
| Abstract | Archean 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 ID | 202902 |
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