Deformation of continental crust along a transform boundary, Coast Mountains, British Columbia

[1] New structural, paleomagnetic, and apatite (U-Th)/ He results from the continental margin inboard of the Queen Charlotte fault (~54 [degrees]N) delineate patterns of brittle faulting linked to transform development since ~50 Ma. In the core of the orogen, ~250 km from the transform, north striking, dip-slip brittle faults and vertical axis rotation of large crustal domains occurred after ~50 Ma and before intrusion of mafic dikes at 20 Ma. By 20 Ma, dextral faulting was active in the core of the orogen, but extension had migrated toward the transform, continuing there until