Evidence of Lithospheric Boudinage in the Grand Banks of Newfoundland from Geophysical Observations

摘要: The evolution of the passive margin off coast Eastern Canada has been characterized by a series rifting episodes which caused widespread extension lithosphere and associated structural anomalies, some with potential to be classified as result lithospheric boudinage. Crustal thinning competent layers is often apparent in seismic sections, deeper Moho undulations may appear repeating elongated anomalies gravity magnetic surveys. By comparing similar evolutions Grand Banks Norwegian Lofoten-Vesteralen margins, it reasonable explore same structures being present. This investigation supplements our knowledge analogous examples Margin South China Sea thorough seismic, signatures, determine that boudinage are evident context Banks. Through analysis geophysical data (including observations), multi-stage mechanism proposed, an upper crust short-wavelength deformation ranging from approximately 20–80 km lower long-wavelength exceeding 200 length. In addition, slightly different block geometry layeredness. Based on these results, there indications wavelength increases each successive phase, changing domino style more shearband/symmetrical scale increased include entire lithosphere.