| Reference Type | Journal (article/letter/editorial) |
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| Title | Magnetic overprinting in the Thanet gabbro complex, Ontario |
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| Journal | Canadian Journal of Earth Sciences |
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| Authors | Buchan, Kenneth L. | Author |
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| Year | 1978 (September 1) | Volume | 15 |
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| Issue | 9 |
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| Publisher | Canadian Science Publishing |
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| DOI | doi:10.1139/e78-148Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 475992 | Long-form Identifier | mindat:1:5:475992:2 |
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| GUID | 0 |
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| Full Reference | Buchan, Kenneth L. (1978) Magnetic overprinting in the Thanet gabbro complex, Ontario. Canadian Journal of Earth Sciences, 15 (9) 1407-1421 doi:10.1139/e78-148 |
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| Plain Text | Buchan, Kenneth L. (1978) Magnetic overprinting in the Thanet gabbro complex, Ontario. Canadian Journal of Earth Sciences, 15 (9) 1407-1421 doi:10.1139/e78-148 |
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| In | (1978, September) Canadian Journal of Earth Sciences Vol. 15 (9) Canadian Science Publishing |
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| Abstract/Notes | Multi-component paleomagnetic remanences are reported for the Thanet gabbro complex of the Grenville Province in Ontario. Forty-five samples (10 sites) attain stable reversed (A) directions in AF's (alternating fields) of 150 Oe (1.2 × 104 A/m) or less. Blocking temperatures (TB's) are 300–350 °C (5 sites) and 525–560° (5 sites). The A1 paleopole of 158.4°E, 38.0°S (k = 593, α95 = 3.1°) for the low TB sites differs significantly at the 95% confidence level from the A2 pole of 172.0°E, 32.3°S (k = 151, α95 = 6.2°) for the high TB sites. Directions from 18 additional samples (at 8 sites) follow great circle paths towards the A direction upon AF demagnetization to 1000 Oe (8.0 × 104 A/m). TB's of the lower coercivity (B) component are 560–580 °C, above TB's of both A components. Upon thermal demagnetization, directions swing away from the A direction and endpoints reached above 560 °C define a normal B paleopole at 159.3°E, 20.3°N (k = 9.6, α95 = 11.7°).If the A and B components are both of thermal origin, B predates A, and was overprinted by A during a regional metamorphic event which reset components with TB's <560 °C but left those unaffected with TB's > 560°C. The difference in the A2 and A1 directions represents apparent polar wander during cooling from above 500 °C to less than 300 °C. If the B component, however, was generated as a low temperature (<300 °C) chemical remanence, the relative age of A and B are reversed—B is younger than A. The applicaton of Thanet paleopoles to the problems of Grenville and Sveconorwegian tectonics is described. |
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