Structure and evolution of the Arctic oceanic crust in the light of new regional compilations

Category Tectonic & Seismotectonic
Group GSI.IR
Location International Geological Congress,oslo 2008
Holding Date 16 August 2008
Structure and evolution of the Arctic oceanic crust in the light of new regional compilations
Gaina, Carmen1; Saltus, Richard2; Alvey, Andrew3
1Geological Survey of Norway, Norway;
2USGS, United States;
3University of Liverpool, United Kingdom

Recent Circum-Arctic digital compilations of magnetic, gravity and bathymetry data have been analysed in order to provide a consistent view of the tectonically complex Arctic basins and surrounding continents. The new grids have been mathematically filtered in order to assist in the regional characterization of magnetic and gravity domains and boundaries. The frequency content, amplitudes, and patterns of regional magnetic anomalies provide a window into the tectonic character and structure of the crust. A range of kinematic scenarios for the Arctic ocean domains based on geophysical and geological data are also presented. Finally, continental lithosphere thinning factor maps were constructed by inverting gravity data from the Arctic Gravity Project. The lithosphere thermal model used to predict the lithosphere thermal gravity anomaly correction used plate reconstruction models to provide the age and location of oceanic lithosphere. We show that the gravity inversion method could be used for discriminating between various plate tectonic scenarios, especially in remote or poorly surveyed regions.