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• W3044763357 endingPage "992" @default.
• W3044763357 startingPage "963" @default.
• W3044763357 abstract "Abstract Palaeoproterozoic orogenesis within the Archean southeastern Rae craton is related to the initial amalgamation of Laurentia. Characterizing the accompanying tectonic processes during this time has been complicated due to polymetamorphism, which results in the obscuring of the age record of the terranes involved. To improve the knowledge of the tectonic evolution of the South Rae Craton, petrologic and structural analyses are applied in conjunction with in situ trace element chemistry, inclusion barometry, U–Pb monazite and titanite, and Lu–Hf garnet chronology. The data robustly constrain Palaeoproterozoic pressure–temperature–time paths of major deformational events along the southeastern Rae craton margin. D 1 occurred between 1.94 and 1.93 Ga in the Dodge‐Snowbird domain, which included prograde burial of metasedimentary rocks, deposited at 2.2–2.0 Ga, and the development of migmatitic layering and east‐southeast trending folds (S 1 , F 1 ). Peak metamorphism is recorded in metasedimentary units at c . 1.93 Ga when rocks reached conditions of 9.0–10.5 kbar and 810–830°C. Within the Dodge‐Snowbird domain, D 2 imparted north‐northeast trending open folds and associated axial planar cleavage (S 2 , F 2 ) between 1.93 and 1.90 Ga during east‐west compression that appears to have been synchronous with cooling and exhumation. Later D 2 deformation, localized within the Wholdaia Lake shear zone (WLsz; S T1 ), developed in the footwall of this thrust‐sense structure at 1,873 ± 5 Ma at conditions of 9.5–11.0 kbar and 820–850°C. The hangingwall Dodge‐Snowbird domain had already cooled to below 300°C by then, indicating a significant structural and metamorphic break across the domain's western boundary. A new phase of unroofing (D 3 ) involved pervasive amphibolite‐ to greenschist facies extensional shearing (S T2 ) within the WLsz, which overprinted S T1 foliations between 1.87 and 1.86 Ga. Continued greenschist facies shearing younger than 1.86 Ga likely ended by c . 1.83 Ga when lamprophyre dykes cut the structure, which was followed by cooling until c . 1.80 Ga. This work highlights the utility and application of multiple chronometers (zircon, monazite, titanite, garnet) along with structural and petrologic analysis that together can resolve precise orogenic cycles in polymetamorphic terranes that may otherwise be undetected. The time‐resolved P–T–D histories derived here enable more robust interpretations regarding the nature and evolution of 1.9 Ga tectonism along the southeast Rae craton margin, which may be used to refine models for Laurentian terrane amalgamation." @default.
• W3044763357 created "2020-07-29" @default.
• W3044763357 creator A5000437824 @default.
• W3044763357 creator A5031427812 @default.
• W3044763357 creator A5062475859 @default.
• W3044763357 creator A5070173469 @default.
• W3044763357 creator A5070891227 @default.
• W3044763357 creator A5076390777 @default.
• W3044763357 date "2020-07-20" @default.
• W3044763357 modified "2023-10-16" @default.
• W3044763357 title "The distinct metamorphic stages and structural styles of the 1.94–1.86 Ga Snowbird Orogen, Northwest Territories, Canada" @default.
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