HR: 1340h
AN: T13D-1577    [Abstracts]
TI: Is There Evidence for Recent Compression Along the Northwind Ridge and Chucki Borderlands?
AU: * Arrigoni, V
EM: varrigoni@tamu.edu
AF: Texas A&M University, Dept. of Geology and Geophysics, College Station, TX 77843, United States
AU: Hopper, J R
EM: hopper@geo.tamu.edu
AF: Texas A&M University, Dept. of Geology and Geophysics, College Station, TX 77843, United States
AU: Coakley, B J
EM: Bernard.Coakley@gi.alaska.edu
AF: University of Alaska Fairbanks, Dept. of Geology and Geophysics, Fairbanks, AK 99775, United States
AU: Kristoffersen, Y
EM: Yngve.Kristoffersen@geo.uib.no
AF: University of Bergen, University of Bergen, Bergen, NO-5007, Norway
AU: Team, H S
EM: hopper@geo.tamu.edu
AF: Multiple Institutions, Multiple Instiutions, College Station, TX 77843, United States
AB: In the summer of 2005, USCG Icebreaker Healy crossed the Arctic Basin from Dutch Harbor, Alaska, to Tromsų, Norway, to collect geophysical data and take shallow cores in an effort to gain greater insight into the paleo- oceanographic, depositional, and tectonic histories of the Arctic Basin. Integrated geophysical data, including seismic reflection, seismic refraction, multi-bean swath mapping, and chirp data, were collected over the Northwind ridge and Chukchi Plateau from the Canada Basin out to the Mendeleev Ridge. These data sets provide insight into the tectonic evolution of the region and shed new light on several controversial aspects of tectonic models for the evolution of the Arctic basins. Significant extensional normal faulting is visible across the profile and there is clear evidence of growth faulting affecting older sediments below a major unconformity. Many of these normal faults appear to have been reactivated quite recently, with some displacing the seafloor. No evidence of tectonic inversion is found in the seismic images, which would be predicted by models for region that propose a thrust fault on the eastern side of the North-wind Ridge.
DE: 8105 Continental margins: divergent (1212, 8124)
DE: 8109 Continental tectonics: extensional (0905)
SC: Tectonophysics [T]
MN: 2007 Fall Meeting