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- W2017001176 abstract "The Thor-Odin dome is a large structural culmination along the eastern margin of the Shuswap terrain. Previous workers have presented divergent models for the origin of the dome. Some have proposed that it is a product of diapiric uprise of material from the lower crust; alternatively, the dome is interpreted to have formed from the interference of later folding. This study presents the results of a detailed analysis of new data on the structure, pattern of strain variation and metamorphic fabric of the dome. These data together with new geochronological and metamorphic phase assemblage information provide the basis for a revised interpretation of the evolution of the Thor-Odin gneiss dome. The pre-doming evolution of the Thor-Odin gneiss dome was characterized by the formation of large-scale nappe structures and the imbrication of Archean basement rocks with the Cambrian and younger cover rock sequence. The first period of deformation (Phase One) consisted of large-scale infolding of the cover rock sequence into the basement rocks. The Pingston fold in the core of the dome is a product of this event. The second period of deformation (Phase Two) was marked by the forcing of wedges of basement into the cores of northerly-directed nappes. These structures had no observable effect on the central core zone, which is here termed the Autochthonous Core Gneiss Domain. The third period of deformation (Phase Three) was co-axial with Phase Two and consisted of imbrication and refolding of the upper levels of the stack of Phase Two nappes. The actual domal shape was formed by fold interference of Phases Four, Five and Six, which were upright, chevron-style, flexural-slip folds with northwest, southwest and northerly-trending axial planes. The “doming” events occurred at upper crustal levels, probably during the Tertiary. Analysis of the strain pattern suggests that little of the total deformational strain is related to these dome-forming deformations. This outline of the events that formed the dome is consistent with the new geochronological results and interpretation of metamorphic phase assemblages. Cordierite-gedrite-sillimanite assemblages, previously interpreted as indicating 1000 MPa pressure, probably formed under reduced water fugacities and 500–700 MPa total pressure. The Thor-Odin gneiss dome thus provides no evidence for lower crustal upwelling related either to dome formation or to the formation of the Rocky Mountain thrust belt." @default.
- W2017001176 created "2016-06-24" @default.
- W2017001176 creator A5075352192 @default.
- W2017001176 date "1984-01-01" @default.
- W2017001176 modified "2023-09-26" @default.
- W2017001176 title "Structural evolution of the Thor-Odin gneiss dome" @default.
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- W2017001176 doi "https://doi.org/10.1016/0040-1951(84)90044-1" @default.
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