Regional Crustal Structure Across Baffin Bay, Northern Canada, From Constrained 3-D Gravity Inversion
- J. Kim Welford (Memorial University of Newfoundland) | Sonya A. Dehler (Natural Resources Canada)
- Document ID
- Offshore Technology Conference
- Arctic Technology Conference, 24-26 October, St. John's, Newfoundland and Labrador, Canada
- Publication Date
- Document Type
- Conference Paper
- 2016. Offshore Technology Conference
- 0 in the last 30 days
- 28 since 2007
- Show more detail
- View rights & permissions
Baffin Bay, northern Canada, represents the northernmost segment of rifting between Greenland and North America, and can be considered a northern extension of the Labrador Sea extinct rift system between Labrador and Greenland. Many questions remain about the nature of the crust beneath parts of Baffin Bay, although extinct spreading axes and a fracture zone have been previously identified based principally on gravity data. Existing deep seismic coverage over Baffin Bay is spatially limited and mostly concentrated in the north, although two regional 2-D transects span the region from the centre to the southern end of the bay. One of the regional 2-D refraction transects revealed a thick sedimentary package overlying oceanic crust along most of the profile, despite a lack of clear magnetic anomalies within Baffin Bay. To extrapolate the 2-D seismic refraction results offline and resolve the regional crustal structure across Baffin Bay, a constrained 3-D gravity inversion was undertaken. Bathymetry and depth to basement were used to constrain the 3-D inversion and the resolved crustal geometry from existing refraction lines was used to gauge the quality and reliability of the inverted model. The final inverted 3-D crustal structure model for Baffin Bay will provide useful constraints for basin studies and will shed light on its tectonic evolution.
|File Size||2 MB||Number of Pages||10|
Altenbernd, T., Jokat, W., Heyde, I., and Damm, V. 2014. A crustal model for northern Melville Bay, Baffin Bay. Journal of Geophysical Research, 119, 8610–8632, doi:10.1002/2014JB011559.
Altenbernd, T., Jokat, W., Heyde, I., and Damm, V. 2015. Geophysical evidence for the extent of crustal types and the type of margin along a profile in the northeastern Baffin Bay. Journal of Geophysical Research, 120, 7337-7360, doi:10.1002/2015JB012307.
Altenbernd, T., Jokat, W., Heyde, I., and Damm, V. 2016. Insights into the crustal structure of the transition between Nares Strait and Baffin Bay. Tectonophysics, in press, http://dx.doi.org/10.1016/j.tecto.2016.04.001.
Dehler, S.A. and Welford, J. K., 2012. Variations in rifting style and structure of the Scotian margin, At- lantic Canada, from 3D gravity inversion, in Conjugate Divergent Margins, edited by W. Mohriak, A. Danforth, P. Post, D. Brown, G. Tari, M. Nemc"ok, & S. Sinha, vol. 369, p. doi: 10.1144/SP369.11, Geological Society, London, Special Publications.
Funck, T., Gohl, K., Damm, V., and Heyde, I. 2012. Tectonic evolution of southern Baffin Bay and Davis Strait: results from a seismic refraction transect between Canada and Greenland. Journal of Geophysical Research, 117, B04107, doi:10.1029/2011JB009110.
Hosseinpour, M., M\"uller, R.D., Williams, S.E., and Whittaker, J.M. 2013. Full-fit reconstruction of the Labrador Sea and Baffin Bay. Solid Earth, 4, 461–479, doi:10.5194/se-4-461-2013.
Oakey, G.N. and Chalmers, J.A. 2012. A new model for the Paleogene motion of Greenland relative to North America: plate reconstructions of the Davis Strait and Nares Strait regions between Canada and Greenland. Journal of Geophysical Research, 117, B10401, doi:10.1029/2011JB008942.
Suckro, S.K., Gohl, K., Funck, T., Heyde, I., Ehrhardt, A., Schreckenberger, B., Gerlings, J., Damm, V., and Jokat, W. 2012. The crustal structure of southern Baffin Bay: implications from a seismic refraction experiment. Geophysical Journal International, 190, 37–58, doi:10.1111/j.1365-246X.2012.05477.x.
Suckro, S.K, Gohl, K., Funck, T., Heyde, I., Schreckenberger, B., Gerlings, J., and Damm, V. 2013. The Davis Strait crust – a transform margin between two oceanic basins. Geophysical Journal International, 193, 78–97, doi:10.1093/gji/ggs126.
Welford, J. K., Shannon, P. M., O'Reilly, B. M., & Hall, J., 2012. Comparison of lithosphere structure across the Orphan Basin-Flemish Cap and Irish Atlantic conjugate continental margins from constrained 3D gravity inversions. Journal of the Geological Society, London, 169, 405–420, doi:10.1144/0016-76492011-114.