Major dextral transcurrent displacements along the Northern Rocky Mountain Trench and related lineaments in north-central British Columbia

摘要: The Northern Rocky Mountain Trench and a number of other prominent lineaments, along east the eastern margin Intermontane Belt, mark faults which dextral transcurrent movements have been dominant. Offsets shelf to off-shelf facies boundaries in lower Paleozoic rocks indicate cumulative displacement at least 750 km, probably >900 within system related those Tintina Trenches. Farther west, another appears offset plutons stratigraphic assemblages Belt by as much 300 km. These faults, including Kutcho Pinchi, connect part with Teslin Suture Zone Yukon Territory Fraser River-Straight Creek fault zone southern British Columbia. Although faulting may taken place between Middle Jurassic early Cenozoic, most convincing evidence points middle Cretaceous particularly Cenozoic (Eocene?) displacements. Eocene(?) were temporally plutonism, volcanism, lamprophyre dike emplacement, high heat flow, sedimentation grabens, rapid uplift northwesterly trending elongate ranges. Climactic episodes granite near northern Omineca Crystalline ∼100 m.y., 70 50 m.y. ago facilitated changes from dominantly compressional tensional strain.