Uranium and thorium in the Precambrian basement of western Canada. II. Petrologic and tectonic controls

• Published in: Canadian Journal of Earth Sciences
• Main Author: Burwash, R. A.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Canadian Science Publishing 1979
• Subjects: General Earth and Planetary Sciences; Canada; Kasba Lake; Peace River
• Online Access: http://dx.doi.org/10.1139/e79-043; http://www.nrcresearchpress.com/doi/pdf/10.1139/e79-043

Analyses of 182 basement cores, when plotted as log U and log Th, show bimodal frequency distributions. Cumulative frequency plots indicate an approximate 35–65% split between the two populations. Histograms of numbers of samples in various rock classes vs. log U fail to explain the bimodal distribu...