Rb–Sr contribution to the location of Churchill–Superior boundary in Manitoba

• Published in: Canadian Journal of Earth Sciences
• Main Authors: Turek, A., Peterman, Z. E.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Canadian Science Publishing 1970
• Subjects: General Earth and Planetary Sciences; Hudson; Hudson Bay; Churchill
• Online Access: http://dx.doi.org/10.1139/e70-095; http://www.nrcresearchpress.com/doi/pdf/10.1139/e70-095

Eight whole-rock Rb–Sr age determinations on basement cores from the Hudson Bay Lowlands define an isochron of 1975 ± 45 m.y. (λ Rb = 1.39 × 10 −11 y −1 ) with an initial 87 Sr/ 88 Sr 0.7018 ± 0.0005. The indicated age is characteristic of the Churchill Province and on this basis Would suggest that the boundary between the Churchill and Superior provinces is to the south of the drill hole location. A similar age, 1925 ± 105 m.y. with an initial 87 Sr/ 86 Sr 0.7025 ± 0.0007, has been obtained on six whole-rock basement samples from the Minago River – Har-grave River area north of Lake Winnipeg.