Crustal structure and lithology of the northern Canadian Cordillera: alternative interpretations of SNORCLE seismic reflection lines 2a and 2b

摘要: Seismic reflectors at shallow crustal levels recorded in SNORCLE (Slave – Northern Cordillera Lithospheric Evolution) lines 2a and 2b the northern Canadian can be reconciled with many stratigraphic structural elements known from geological mapping. Clearly evident examples are penetrating, Rocky Mountain Trench (NRMT) Fault, several kilometres thin slices of Slide (Sylvester Allochthon) Cache Creek terranes, northward dipping Hotailuh Fault. Interpretations lithological successions structures deeper more speculative. Of fundamental significance is a southwesterly tapering wedge continental crust overlain its distal part by allochthonous terrane Stikinia and, northeast Thibert thick, probably structurally thickened sequence sedimentary rocks extensive granitic Cassiar batholith. The top interpreted to tectonic accretion surface resulting collision Sti...