Wide-angle reflectivity across the Torngat Orogen, NE Canada

Data from a Lithoprobe refraction/wide-angle reflection seismic transect ac ross the Torngat Orogen in NE Canada were depth-migrated to produce a recor d section similar to near-vertical incidence seismic data. Densely spaced a irgun shots and a station spacing between 9 and 25 km were able to produce a low-frequency image of the lower crustal reflectivity for most of the tra nsect. Over the western end of the profile, a series of east-dipping lower crustal reflectors continue down to the Moho, which is clearly defined at a depth of 36 to 38 km, The lower crustal reflectors can be correlated later ally for up to 80 km. This reflection fabric is interpreted as evidence for thick-skinned deformation caused by convergence of the Nain and Superior p rovinces. Over the eastern end of the line, reflectors in the Nain Province are less continuous and may indicate steeply dipping faults, which have no t been modified during formation of the orogen.