Multiple Deformation of Crystalline Rocks in the Tazin Group, Eldorado Fay Mine, NW Saskatchewan

• Published in: Canadian Journal of Earth Sciences
• Main Authors: Krupička, J., Sassano, G. P.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Canadian Science Publishing 1972
• Subjects: General Earth and Planetary Sciences; Eldorado; Lake Athabasca
• Online Access: http://dx.doi.org/10.1139/e72-034; http://www.nrcresearchpress.com/doi/pdf/10.1139/e72-034

The crystalline rocks of the uranium-bearing Precambrian Tazin Group on the north shore of Lake Athabasca in Saskatchewan have long been known to contain a high proportion of cataclastic rocks. A detailed microscopic textural study of the Tazin rocks from the Eldorado Fay Mine, Beaverlodge, shows that: (a) all units of the Tazin Group have been affected by strong postcrystalline (partly syncrystalline) deformation; (b) in many places the deformation reached the highest degree of crushing encountered in sheared rocks; (c) deformation occurred in several distinct phases separated by considerable time intervals and at successively higher structural levels; and (d) the rocks are thus polydeformational.The deformation was so strong that many crystalline rocks have developed the outward appearance of argillites and tuffs.