Chris Butzer, Robert F. Butler, George E. Gehrels, Cameron Davidson, Kristin O'Connell, Maria Luisa Crawford; Neogene tilting of crustal panels near Wrangell, Alaska. Geology ; 32 (12): 1061–1064. doi: https://doi.org/10.1130/G20855.1
Download citation file:
A late Oligocene–Miocene igneous complex south and west of Wrangell, Alaska, contains mafic dikes that yield a discordant paleomagnetic direction (inclination, I = 70.4°; declination, D = 39.3°; α95 = 4.8°; N = 72 sites). Combined with local and regional geobarometric, metamorphic, and structural observations, the discordant paleomagnetic direction indicates east-side-up tilt by 16° about a tilt axis with azimuth = 8°. Neogene tilt of crustal blocks in the Insular superterrane accounts for much of the paleomagnetic discordance in Cretaceous plutons without the coastwise translation of >1000 km, as suggested by the Baja British Columbia hypothesis.