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A paleomagnetic test for northward tectonic transport of the eastern Selwyn Basin, northern Canadian Cordillera; data from the Mid-Cretaceous Ragged Pluton

Symons, D. T. A ; Kawasaki, K ; Hart, C. J. R ; Harris, M. J Cook, Fred

Canadian journal of earth sciences, 2008-07, Vol.45 (7), p.860-869 [Periódico revisado por pares]

Ottawa: National Research Council of Canada

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Título:
A paleomagnetic test for northward tectonic transport of the eastern Selwyn Basin, northern Canadian Cordillera; data from the Mid-Cretaceous Ragged Pluton
Autor: Symons, D. T. A ; Kawasaki, K ; Hart, C. J. R ; Harris, M. J
Cook, Fred
Assuntos: autochthons ; Basins ; Canada ; Canadian Cordillera ; characteristic remanent magnetization ; Cretaceous ; demagnetization ; experimental studies ; Igneous rocks ; intrusions ; magnetic declination ; magnetic domains ; Magnetic fields ; magnetic inclination ; magnetic minerals ; magnetite ; magnetization ; Mesozoic ; Middle Cretaceous ; North America ; North American Cordillera ; Northwest Territories ; oxides ; paleomagnetism ; Petrology ; plutons ; pole positions ; pyrrhotite ; Ragged Pluton ; remanent magnetization ; Selwyn Basin ; single domains ; Stratigraphy ; Structural geology ; sulfides ; tectonics ; Tungsten Plutonic Suite ; Western Canada
É parte de: Canadian journal of earth sciences, 2008-07, Vol.45 (7), p.860-869
Notas: ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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Descrição: Ragged Pluton is a member of the Tungsten Plutonic Suite in the eastern Selwyn Basin. This circular massive 97 Ma granitic pluton is ∼5 km in diameter. It intrudes deformed and metamorphosed clastic strata of the Neoproterozoic to Lower Cambrian Vampire Formation. Thermal and alternating field step demagnetization data for 216 specimens from 21 plutonic sites isolated a stable characteristic remanent magnetization (ChRM) direction at 20 sites of declination D = 325.9°, inclination I = 80.4° (α95 = 2.7°, k = 142). Thermal demagnetization and saturation remanence analysis show that the ChRM is carried by both single-domain pyrrhotite and magnetite. Ragged Pluton's paleopole at 73.9°N latitude, 191.4°E longitude (dp = 5.0°, dm = 5.2°) is concordant with its co-eval 97 Ma North American reference paleopole, showing at 95% confidence that the pluton has not been significantly rotated or translated relative to North America. This paleomagnetic result favours tectonic models in which the eastern Selwyn Basin is autochthonous, or nearly so, since the mid Cretaceous.
Editor: Ottawa: National Research Council of Canada
Idioma: Inglês

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A paleomagnetic test for northward tectonic transport of the eastern Selwyn Basin, northern Canadian Cordillera; data from the Mid-Cretaceous Ragged Pluton

Symons, D. T. A ; Kawasaki, K ; Hart, C. J. R ; Harris, M. J Cook, Fred

Ottawa: National Research Council of Canada

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