| Reference Type | Journal (article/letter/editorial) |
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| Title | Uranium and thorium in the Precambrian basement of western Canada. I. Abundance and distribution |
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| Journal | Canadian Journal of Earth Sciences |
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| Authors | Burwash, R. A. | Author |
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| Cumming, G. L. | Author |
| Year | 1976 (February 1) | Volume | 13 |
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| Issue | 2 |
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| Publisher | Canadian Science Publishing |
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| DOI | doi:10.1139/e76-030Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 474789 | Long-form Identifier | mindat:1:5:474789:9 |
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| GUID | 0 |
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| Full Reference | Burwash, R. A., Cumming, G. L. (1976) Uranium and thorium in the Precambrian basement of western Canada. I. Abundance and distribution. Canadian Journal of Earth Sciences, 13 (2) 284-293 doi:10.1139/e76-030 |
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| Plain Text | Burwash, R. A., Cumming, G. L. (1976) Uranium and thorium in the Precambrian basement of western Canada. I. Abundance and distribution. Canadian Journal of Earth Sciences, 13 (2) 284-293 doi:10.1139/e76-030 |
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| In | (1976, February) Canadian Journal of Earth Sciences Vol. 13 (2) Canadian Science Publishing |
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| Abstract/Notes | Delayed neutron activation analyses of 182 core samples from the basement of the western Canada sedimentary basin give mean values of 4.13 ppm U and 21.1 ppm Th. These values are almost twice the published values for the Shield as a whole. Replicate analyses of a composite sample of all cores indicates an analytical precision of ±1% for uranium and ±7% for thorium.Histograms of number of samples vs. U and Th values indicate a negatively skewed frequency distribution. Analysis of composite samples prepared from a large number of hand specimens may tend to conceal this skewed nature. Mean abundance values will also be influenced by the form of the U and Th frequency distributions.Trend surface analysis, with smoothing to reduce the effect of high or low single sample values, indicates two 'highs' common to both U and Th. The helium-producing area around Swift Current, Saskatchewan is associated with a high U–Th plutonic complex. A linear belt trending northeast from Edmonton appears to be a Hudsonian metamorphic belt in which U and Th have been concentrated. Several local concentrations of U or Th are found in the Peace River Arch of northern Alberta. |
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