Geometry, evolution, and tectonic framework of the Skeena Fold Belt, north central British Columbia

摘要: The Intermontane Belt of the Canadian Cordillera has long been viewed as a passive, relatively rigid block between two metamorphic-plutonic belts, Coast Plutonic Complex and Omineca Belt. However, Skeena Fold Belt, which spans most width northern exhibits shortening comparable with that in Rocky Mountain Thrust many features thin-skinned fold thrust such faults sole into detachment, wide variety structural styles depend on rock type, foreland basin was cannibalized by continued deformation, frontal triangle zone, hinterland metamorphic plutonic rocks (Coast Complex). thus is but rather than deforming continental terrace wedge, it developed terrane (Stikinia) had accreted to North America early Mesozoic, Jurassic Cretaceous clastic successions (Bowser Lake Sustut groups) overlie Stikinia. Structural stratigraphic relationships show earliest deformation occurred Oxfordian Albian time last folds latest or Tertiary time. As much 160 km northeastward broadly contemporaneous crustal thickening dextral strike-slip faulting east Therefore, times, horizontal occured across Cordillera. Concurrent suggests common detachment (or detachments) fed all these zones far