Brittle faulting in the Canadian Appalachians and the interpretation of reflection seismic data

摘要: Abstract Brittle faults in the Canadian Appalachians, mostly Late Devonian or younger age, are divided into two groups on basis of their movement vectors: a strike-slip group and dip-slip group. The subdivided orientation sense movement. They interpreted terms Palaeozoic transpression Mesozoic extension during Atlantic opening. comprise reverse which were active Devono-Carboniferous times. as transfer they coupled with normal faults, many developed by reactivation earlier steeply-dipping surfaces including bedding foliations. Together these an adequate mechanism for crustal perpendicular to orogen. Evidence listric is rare older rocks orogen, it suggested that this due adequacy deformation mechanisms afforded pre-existing planes weakness. data presented demonstrate clearly geological structures commonly repeated at all scales from outcrop regional. Following principle, prominent shallowly-dipping reflectors imaged Lithoprobe East seismic profiles large-scale representatives seen outcrop, reactivated It faulting be expected general late stages collisional We draw attention importance modifying attitude such bedding, foliations faults.