PALEOMAGNETISM OF THE KNIGHT ISLAND OPHIOLITE, PRINCE WILLIAM SOUND, ALASKA

摘要

INTRODUCTION The Knight Island ophiolite, within the Chugach-Prince William Sound terrane (CPW), formed along a trench-ridge-trench (TRT) boundary (Bradley et al., 2003). Previous work on the paleomagnetism of the Knight Island ophiolite reveals a complex history of overprinting thus not yielding a reliable paleo-magnetic pole (Bol, 1993). In this project, we focus sampling to the sheeted dike complex of the ophiolite because it might be more resistant to chemical alteration than the pillow basalts, and using chilled margins to determine orientation should provide a better indicator of paleohorizontal than estimation from pillow basalt tops.