Harbert, W and Hillhouse, J and Vallier, T
(1995)
Paleomagnetism of the Permian Wallowa terrane: implications for terrane migration and orogeny.
Journal of Geophysical Research, 100 (B7).
ISSN 0148-0227
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Abstract
A sequence of volcaniclastic sedimentary and pyroclastic rocks of Permian age in the Wallowa terrane of Oregon and Idaho has been sampled for paleomagnetic study. Thermal demagnetization revealed three components of magnetization. The A component has the lowest unblocking temperatures, has normal polarity, and fails the fold test. The B component is removed between heating steps of about 200°C and 550°C, is of normal polarity, and also fails the fold test. The C component, observed between heating steps of approximately 550°C and 660°C is always of negative inclination. The grouping of this component improves slightly upon unfolding. This component in interpreted as the characteristic remanent magnetization acquired during deposition of the Hunsaker Creek Formation. The resulting paleolatitude, calculated using inclination-only statistics, of 24° ± 12° N (n ≥ 3, k ≥ 10), or 26° ± 9° N (n ≥ 3 sites), implies a northern hemisphere position of the Wallowa terrane during the Early Permian and possible southward transport of this terrane with respect to North America. If the Wallowa terrane was attached to the Wrangellia superterrane, the results indicates a northern hemisphere location for that superterrane during the Permian. -from Authors
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