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Geology; December 2004; v. 32; no. 12; p. 1061-1064; DOI: 10.1130/G20855.1
© 2004 Geological Society of America
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Neogene tilting of crustal panels near Wrangell, Alaska

Chris Butzer1, Robert F. Butler*,1, George E. Gehrels*,1, Cameron Davidson*,2, Kristin O'Connell*,2 and Maria Luisa Crawford*,3

1 Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA
2 Department of Geology, Carleton College, Northfield, Minnesota 55057, USA
3 Department of Geology, Bryn Mawr College, Bryn Mawr, Pennsylvania 19010, USA

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°; {alpha}95 = 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.

Key Words: Coast orogen • southeast Alaska • paleomagnetism • Neogene crustal extension






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