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- W2181560219 abstract "The region spanning the central Mackenzie Valley, centered on the communities of Norman Wells and Tulita, encompasses a variety of structural styles. Five distinct structural domains (Figure 1) can be defined in this region based on involved stratigraphic intervals, dominant structural trends, dominant structure type, and pre-Cordilleran history. Pre-Cordilleran events that affect the structural styles in the region can be recognized as far back as the Cambrian. During the Cambrian, extensional faulting and deposition of an evaporitic succession in a semirestricted basin provided key elements controlling the development of Cordilleran structures. Structural Domains The structural domains of the central Mackenzie Valley region (Figure 1) are, from southwest to northeast: Mackenzie Fold Belt, Mackenzie Plain, Franklin, Colville, and Great Bear domains. The Gambill sub-domain of the Mackenzie Plain represents a locally anomalous trend. The Mackenzie Fold Belt domain is characterized by fold-and-thrust style deformation with a detachment in or below the lower part of the Neoproterozoic Mackenzie Mountains Supergroup. Structures are dominated by northwest trends of Cordilleran affinity. Although northnorthwest trending normal faults of Proterozoic to Cambrian age are present, they are secondary to the Cordilleran features. Cambrian evaporites are limited to the easternmost slopes and do not influence structural style. Cordilleran fold and thrust structures are also present in the Mackenzie Plain, but structures are smaller than those found in the Mackenzie Fold Belt, and the detachment level is commonly within evaporites of the Cambrian Saline River Formation. Structural trends are more variable than in the Mackenzie Mountains, but northwest trends dominate with the exception of the northeast trend found in the Gambill sub-domain. Northerly trends from pre-Cordilleran structures do not appear to influence the younger structures. Folds and faults in the Franklin domain are detached within evaporites of the Saline River Formation (Cook and Aitken, 1976; Cook and MacLean, 1999). Structures in this domain have greater topographic relief and variation in trend than those found in the adjacent Mackenzie Plain, though northwest and west trends dominate. This interference pattern may be related to relatively low strain, combined with a" @default.
- W2181560219 created "2016-06-24" @default.
- W2181560219 creator A5062964298 @default.
- W2181560219 date "2013-01-01" @default.
- W2181560219 modified "2023-09-24" @default.
- W2181560219 title "Cambrian Features Constrain Cordilleran Structures In The Central Mackenzie Valley Region" @default.
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