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Paleomagnetism Of Four Late Cretaceous Plutons North Cascades, Washington, William J. (William James) Harrison
Paleomagnetism Of Four Late Cretaceous Plutons North Cascades, Washington, William J. (William James) Harrison
WWU Graduate School Collection
Paleomagnetic directions of samples from the Ten Peak and Sulphur Mtn. plutons, Hidden Lake stock, and Oval Peak batholith in the North Cascades reveal multi-component magnetization and instability. In the Hidden Lake stock and Ten Peak pluton, a strong viscous overprint parallels the present day field. The Sulphur Mountain pluton shows complete magnetic instability; making it impossible to compute a meaningful mean direction. The rocks of the Oval Peak batholith are believed to have been magnetically reset during the Eocene, although the observed declination of 167° and inclination of -67° is significantly different from the expected Eocene direction. The mean …