Reflectivity of highly deformed terranes based on laboratory and in situ velocity measurements from the Grenville Front Tectonic Zone, central Ontario, Canada.

The Grenville Front Tectonic Zone (GFTZ) is a pronounced geological and geophysical discontinuity which extends from northern Labrador to the southern United States. A deep seismic reflection profile (GLIMPCE Profile J) across the GFTZ in Lake Huron shows a series of high amplitude, multicyclic, dipping reflections. This work addresses the origin of these reflections based on laboratory and in situ measurements of compressional wave velocities in GFTZ rocks.