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Tectonic Implications of a Remagnetization Event in the Newark Basin

Witte, William K.; Kent, Dennis V.

The Newark basin red beds contain a secondary magnetization (the B component) acquired during the Middle Jurassic after the 5°-20° basin-wide northwesterly dip was imparted to the strata of the basin and after most, if not all, of the limb rotation in the Jacksonwald syncline. The B component magnetization was most likely related to the same hydrothermal event which evidently remagnetized many of the igneous intrusions in the basin and reset their K/Ar systems at 175 Ma. The remagnetization of the red beds occurred over a few million years and was approximately coincident with the transition from continental rifting to seafloor spreading in the adjacent North Atlantic. The B component magnetization direction yields a paleomagnetic pole at 74°N, 96°E (K = 63, A_95 = 2.6°, N = 50 sites) after structural correction for 1/3 of the Jacksonwald folding and none of the regional tilt. This pole supports recent evidence for a high-latitude model of Jurassic apparent polar wander for North America.

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Title
Journal of Geophysical Research
DOI
https://doi.org/10.1029/91JB01866

More About This Work

Academic Units
Lamont-Doherty Earth Observatory
Biology and Paleo Environment
Published Here
August 30, 2011