| Reference Type | Journal (article/letter/editorial) |
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| Title | U–Pb geochronology of the Coldwell Complex, northwestern Ontario, Canada |
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| Journal | Canadian Journal of Earth Sciences |
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| Authors | Turek, A. | Author |
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| Smith, Patrick E. | Author |
| Symons, D. T. A. | Author |
| Year | 1985 (April 1) | Volume | 22 |
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| Issue | 4 |
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| Publisher | Canadian Science Publishing |
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| DOI | doi:10.1139/e85-062Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 478640 | Long-form Identifier | mindat:1:5:478640:9 |
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| GUID | 0 |
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| Full Reference | Turek, A., Smith, Patrick E., Symons, D. T. A. (1985) U–Pb geochronology of the Coldwell Complex, northwestern Ontario, Canada. Canadian Journal of Earth Sciences, 22 (4) 621-626 doi:10.1139/e85-062 |
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| Plain Text | Turek, A., Smith, Patrick E., Symons, D. T. A. (1985) U–Pb geochronology of the Coldwell Complex, northwestern Ontario, Canada. Canadian Journal of Earth Sciences, 22 (4) 621-626 doi:10.1139/e85-062 |
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| In | (1985, April) Canadian Journal of Earth Sciences Vol. 22 (4) Canadian Science Publishing |
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| Abstract/Notes | The Coldwell Complex gives a U–Pb zircon age of 1188 ± 56 Ma, a U–Pb tritomite age of 1126 ± 6 Ma, and a Pb–Pb potash feldspar age of 1139 ± 55 Ma. These ages are all significantly older than the previously published Rb–Sr and K–Ar ages. We interpret these ages as follows: (1) emplacement of the complex at 1188 Ma as part of the initial stages of the Keweenawan rifting event at depth; (2) slow cooling leading to closure of the U and Pb systems in tritomite and potash feldspar between 1139 and 1126 Ma; and (3) continued slow cooling leading to closure of the Rb–Sr system in the complex at an average age of 1053 ± 10 Ma and of the K–Ar system at ~1035 Ma. |
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