| Reference Type | Journal (article/letter/editorial) |
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| Title | Age of the Firesand River carbonatite complex from paleomagnetism |
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| Journal | Canadian Journal of Earth Sciences |
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| Authors | Symons, D. T. A. | Author |
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| Year | 1989 (November 1) | Volume | 26 |
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| Issue | 11 |
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| Publisher | Canadian Science Publishing |
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| DOI | doi:10.1139/e89-205Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 480281 | Long-form Identifier | mindat:1:5:480281:9 |
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| GUID | 0 |
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| Full Reference | Symons, D. T. A. (1989) Age of the Firesand River carbonatite complex from paleomagnetism. Canadian Journal of Earth Sciences, 26 (11) 2401-2405 doi:10.1139/e89-205 |
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| Plain Text | Symons, D. T. A. (1989) Age of the Firesand River carbonatite complex from paleomagnetism. Canadian Journal of Earth Sciences, 26 (11) 2401-2405 doi:10.1139/e89-205 |
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| In | (1989, November) Canadian Journal of Earth Sciences Vol. 26 (11) Canadian Science Publishing |
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| Abstract/Notes | The 2.3 km diameter Firesand River complex intrudes Archean volcanics and granites of the Wawa Subprovince in the Superior Province about 8 km east of Wawa, Ontario. It has given differing Middle Proterozoic K–Ar biotite ages of 1018 ± 50 and 1097 Ma. Alternating-field and thermal step demagnetization of specimens from three calcific carbonatite sites, five ferruginous dolomitic carbonatite sites, and one lamprophyre dike site isolated a stable mean direction of 290°, 33 °(α95 = 12°). Isothermal remanent magnetization tests indicate the remanence is held by single-to pseudosingle-domain magnetite and hematite in the carbonatite. The dike remanence is Keweenawan in age, thereby confirming its genetic relationship to the complex, and it gives a positive partial contact test with its host rock, indicating no postintrusive remagnetization. The blocking-temperature spectra indicate that postintrusive uplift has not exceeded about 4 km. The pole position for the complex is 183°E, 27°N (dp = 8°, dm = 13°). This pole lies directly on the well-dated Keweenawan apparent polar wander path, giving an age of 1090 ± 10 Ma, in agreement with the older K–Ar age. It also confirms geologic and aeromagnetic evidence that the complex has not been tectonically tilted since emplacement. |
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