Reference Type | Journal (article/letter/editorial) |
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Title | Two hundred and twenty million years of Archean evolution: a zircon U–Pb age stratigraphic study of the Uchi–Confederation Lakes greenstone belt, northwestern Ontario |
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Journal | Canadian Journal of Earth Sciences |
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Authors | Nunes, P. D. | Author |
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Thurston, P. C. | Author |
Year | 1980 (June 1) | Volume | 17 |
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Issue | 6 |
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Publisher | Canadian Science Publishing |
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DOI | doi:10.1139/e80-068Search in ResearchGate |
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| Generate Citation Formats |
Mindat Ref. ID | 476703 | Long-form Identifier | mindat:1:5:476703:3 |
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GUID | 0 |
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Full Reference | Nunes, P. D., Thurston, P. C. (1980) Two hundred and twenty million years of Archean evolution: a zircon U–Pb age stratigraphic study of the Uchi–Confederation Lakes greenstone belt, northwestern Ontario. Canadian Journal of Earth Sciences, 17 (6) 710-721 doi:10.1139/e80-068 |
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Plain Text | Nunes, P. D., Thurston, P. C. (1980) Two hundred and twenty million years of Archean evolution: a zircon U–Pb age stratigraphic study of the Uchi–Confederation Lakes greenstone belt, northwestern Ontario. Canadian Journal of Earth Sciences, 17 (6) 710-721 doi:10.1139/e80-068 |
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In | (1980, June) Canadian Journal of Earth Sciences Vol. 17 (6) Canadian Science Publishing |
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Abstract/Notes | Three metavolcanic units in the Uchi–Confederation Lakes greenstone belt have been dated by the zircon U–Pb method. Ages obtained reveal a time interval of [Formula: see text] separating the cycle I crystal tuff (2958.6 ± 1.7 Ma) from the cycle III rhyolite ([Formula: see text]). A cycle II rhyolite about 2794 Ma old lies between the other two units. Uranium-rich xenocrystic cores occur in the cycle I zircons and are indirect evidence of preexisting sialic material.A metamorphosed granodiorite, intrusive into the cycle III rhyolite, is about the same age as the rhyolite. A post-metamorphic quartz monzonite pluton is dated at 2729.6 ± 1.3 Ma. A period of dynamothermal metamorphism in this portion of the Superior Province indirectly dated at [Formula: see text] reflects the Kenoran orogeny. |
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