Paleomagnetism of a Paleozoic anorthosite from the Appalachian Piedmont, northern Delaware: possible tectonic implications

摘要: Two components of magnetization have been observed in fourty-four samples (five sites) the anorthosites Arden Pluton. One component, with D = 325 ° , I -75 k 32, c~9 s 13.6 was isolated many by progressive alternating field demagnetization and remainder collection use intersecting great circles remagnetization. The corresponding pole is located at 16 N, 303°E, dp 22.7 ,dm 24.9 . Assuming age last metamorphism (Taeonic, ca. 440 Ma) Cambrian Pluton to be magnetization, this deviates significantly from coeval poles thus far obtained North American craton. preferred explanation for deviation that surrounding Piedmont rocks belonged a different Early Paleozoic plate on south or east side lapetus Ocean, most likely African (Gondwana) plate, it transferred during subsequent continental collision.