| Reference Type | Journal (article/letter/editorial) |
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| Title | The geochronology of uranium deposits in the Great Bear batholith, Northwest Territories |
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| Journal | Canadian Journal of Earth Sciences |
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| Authors | Miller, Richard G. | Author |
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| Year | 1982 (July 1) | Volume | 19 |
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| Issue | 7 |
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| Publisher | Canadian Science Publishing |
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| DOI | doi:10.1139/e82-124Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 477574 | Long-form Identifier | mindat:1:5:477574:8 |
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| GUID | 0 |
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| Full Reference | Miller, Richard G. (1982) The geochronology of uranium deposits in the Great Bear batholith, Northwest Territories. Canadian Journal of Earth Sciences, 19 (7) 1428-1448 doi:10.1139/e82-124 |
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| Plain Text | Miller, Richard G. (1982) The geochronology of uranium deposits in the Great Bear batholith, Northwest Territories. Canadian Journal of Earth Sciences, 19 (7) 1428-1448 doi:10.1139/e82-124 |
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| In | (1982, July) Canadian Journal of Earth Sciences Vol. 19 (7) Canadian Science Publishing |
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| Abstract/Notes | The oldest uranium mineralisation found in the Great Bear batholith during this study may be hydrothermal pitchblende–hematite veins at Hottah Lake. Their apparent age of 2058 ± 34 Ma can also be explained by the contamination of deposits only 440 ± 57 Ma old, which is the age of pitchblende veins nearby. Numerous pendants of metamorphosed, uraninite-bearing "black sand" placers in a north-trending belt west of the Wopmay Fault are 1860 ± 20 Ma old, the age of the granites that intrude them. Mineralisation at Echo Bay is from 1500 ± 10 to 1424 ± 29 Ma old, and extends up to 30 km north and 40 km south of Echo Bay. The JD claims contain small quartz vein deposits dated at 535 ± 164 and 1092 ± 115 Ma. At Mountain Lake, pitchblende in Helikian sandstones overlying the batholith is 1076 ± 96 Ma old. Polymetallic veinlets at Mazenod Lake are 457 ± 26 Ma old. Pitchblende in a giant quartz vein at the Rayrock mine is 511 ± 86 Ma old. Small pitchblende veins east of the batholith along the Coppermine River are between 400 and 660 Ma old.All the deposits are either between ~395 and 660 Ma old, or indicate remobilization during this interval. These events may be related to a marine transgression and regression approximately 600 and 350 Ma ago, respectively. |
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