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Paleomagnetism and magnetic anisotropy of Carbonifeous red beds from the Maritime Provinces of Canada: Evidence for shallow paleomagnetic inclinations and implications for North American apparent polar wander

Bilardello, Dario, and Kenneth P. Kodama (2010), Paleomagnetism and magnetic anisotropy of Carbonifeous red beds from the Maritime Provinces of Canada: Evidence for shallow paleomagnetic inclinations and implications for North American apparent polar wander, Geophys. J. Int., doi:doi: 10.1111/j.1365-246X.2009.04457.x.

Abstract
A palaeomagnetic and magnetic anisotropy study was conducted on the lower-middle Carboniferous
Maringouin and Shepody red bed formations of the Maritime Provinces of Canada
to detect and correct inclination shallowing. Because of the shallow inclinations commonly
observed in red beds and the strong dependence of North America’s Palaeo-Mesozoic apparent
polar wander (APW) on red beds, inclination shallowing may substantially affect large
portions of North America’s APW path.
Hematite is the primary magnetic mineral carrier in these red beds, accompanied by secondary
magnetite, maghemite, goethite and pigmentary hematite.
Thermal and chemical demagnetization of the Shepody Fm. successfully isolated characteristic
remanence directions of D = 177?, I = 20.4?, ?95 = 6.5?, N = 19 and D = 177.8?
I = 17.7?, ?95 = 6.9?, N = 16, respectively. Thermal demagnetization of the Maringouin Fm.
isolated a characteristic remanence direction of D = 178.7?, I = 24.9?, ?95 = 14.5?, N = 9.
High field anisotropy of isothermal remanence followed by alternating field and thermal
cleaning on leached samples was used to isolate the fabric of hematite. Individual particle
anisotropy was measured directly from magnetic separates using a new technique. Hematite’s
magnetic fabric and particle anisotropy were used to apply an inclination correction.
Our inclination corrections indicate up to 10? of inclination shallowing, corresponding to
corrected palaeopole positions of 27.2?N, 118.3?E, A95 = 6.2? and 27.4?N, 117.2?E, A95 =
13.1? for the Shepody and Maringouin formations, respectively. This correction corresponds
to a ? 6? increase in colatitude for Carboniferous North America, which translates into
approximately a 650 km change in North America’s palaeogeographic position. The proposed
position of North America supports a Pangea B-type reconstruction.
BibTeX
@article{id1411,
  author = {Dario Bilardello and Kenneth P. Kodama},
  journal = {Geophys. J. Int.},
  title = {{Paleomagnetism and magnetic anisotropy of Carbonifeous red beds from the Maritime Provinces of Canada: Evidence for shallow paleomagnetic inclinations and implications for North American apparent polar wander}},
  year = {2010},
  doi = {doi: 10.1111/j.1365-246X.2009.04457.x},
}
EndNote
%0 Journal Article
%A Bilardello, Dario
%A Kodama, Kenneth P.
%D 2010
%J Geophys. J. Int.
%T Paleomagnetism and magnetic anisotropy of Carbonifeous red beds from the Maritime Provinces of Canada: Evidence for shallow paleomagnetic inclinations and implications for North American apparent polar wander
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Printed 11. Aug 2020 16:06