Neogene tilting of crustal panels near Wrangell, Alaska

Chris Butzer, Robert F. Butler, George E. Gehrels, Cameron Davidson, Kristin O'Connell, Maria Luisa Crawford

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)1061-1064
Number of pages4
JournalGeology
Volume32
Issue number12
DOIs
StatePublished - Dec 1 2004

Keywords

  • Coast orogen
  • Neogene crustal extension
  • Paleomagnetism
  • Southeast Alaska

ASJC Scopus subject areas

  • Geology

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