Tectonic implications for a Cordilleran orogenic base in the Frenchman Cap dome, southeastern Canadian Cordillera

Gervais, Félix; Brown, Richard L.; Crowley, James L.

doi:10.1016/j.jsg.2010.05.006

Cited by 24 publications

(16 citation statements)

References 51 publications

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“…The early Eocene corresponds to the timing of fi nal contraction. Based on U-Pb titanite from the Bourne gray granite dike suite, Gervais et al (2010) Price and Mountjoy, 1970;Price, 1981;McMechan and Thompson, 1992). The early Eocene cessation of contractional deformation ended subsidence in the Alberta foreland basin.…”

Section: Early Cenozoic Tectonic Pulsementioning

confidence: 99%

“…Between the Middle Jurassic and early Eocene, the Cordilleran realm was mainly under compression, accompanied at different times by sinistral and dextral transpression (Evenchick et al, 2007;Gervais et al, 2010). Events leading to Cordilleran mountain building started in Middle Jurassic time, as a result of breakup of Pangea and North American plate motion toward subduction zones at its western margin, followed by collisions with eastward and northeastward drifting island arcs on the proto-Pacifi c lithosphere (e.g., Monger et al, 1972Monger et al, , 1982Monger, 1984Monger, , 1989Gabrielse et al, 1992;Monger and Price, 2002).…”

Section: Introductionmentioning

confidence: 99%

“…Proterozoic strata, locally overprinted by low-to medium-grade metamorphism, dominate in the western parts of the belt, unmetamorphosed Paleozoic strata in the central and eastern parts, and Mesozoic to Cenozoic rocks in the frontal parts (Monger, 1989). Contraction was succeeded by transtension and extension during the middle Eocene (Evenchick et al, 2007;Gervais et al, 2010;Gervais and Brown, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Orogenic pulses in the Alberta Rocky Mountains: Radiometric dating of major faults and comparison with the regional tectono-stratigraphic record

Pană

Pluijm

2014

Geological Society of America Bulletin

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Radiometric ages from regionally distributed thrust-fault gouge show that the eastward propagation of the southern Rocky Mountain fold-and-thrust belt inCanada occurred in four orogenic pulses that correlate with tectonic events of the Cordilleran interior and with depositional patterns in the adjacent foreland. In the Main Ranges, the Pyramid (163.0 Ma), Simpson Pass (161.7 Ma), and Johnson Creek (145.7 Ma) thrusts were related to the initiation of thinskinned deformation from Jurassic terrane accretion and were partly contemporaneous with development of the fi rst clastic wedge in the foreland basin. In the Front Ranges, the emplacement of the Greenock thrust (103.1 Ma) and Broadview-Snake Indian thrust (99.2 Ma) was contemporaneous with development of Cenomanian deltaic deposits in the immediate foreland. Three thrusts in the Front Ranges, Rocky Pass (74.8 Ma), Sulfur Mountain (75.6 Ma), and Clear water (74.2 Ma) thrusts, defi ne a Campanian phase of tectonic loading that led to the last major transgression in the southern portion of the Alberta foreland. Along the eastern margin of the Front Ranges, the McConnell thrust (54.0 Ma), together with the Muskeg (52.4 Ma), Brule (53.9 Ma), and Nikanassin (52.1 Ma) thrusts in the Foothills, recorded the last phase of regional contraction. The Late Jurassic, mid-Cretaceous, Late Cretaceous, and early Eocene deformation pulses are separated by relatively long periods (>40 m.y., >20 m.y., and >10 m.y.) of tectonic quiescence. These spatially and temporally restricted fault motion pulses contrast with gradual, forward fault propagation, while regional eastward progression of deformation is preserved. REGIONAL GEOLOGY ., 1983, Geochronology and tectonic implications of magmatism and metamorphism, southern Kootenay Arc and neighbouring regions, southeastern British Columbia: Part 1. Jurassic to mid-

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Section: Early Cenozoic Tectonic Pulsementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Orogenic pulses in the Alberta Rocky Mountains: Radiometric dating of major faults and comparison with the regional tectono-stratigraphic record

Pană

Pluijm

2014

Geological Society of America Bulletin

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“…In the structurally deepest basement rocks of the Frenchman Cap dome, evidence is preserved for Paleoproterozoic (2.06 Ga and ca. 1.85 Ga) deformation and metamorphism, which were not overprinted by Cordilleran orogenic events (Crowley, 1999;Crowley et al, 2001;Gervais et al, 2010).…”

Section: Geological Backgroundmentioning

confidence: 96%

Age and provenance of a Paleoproterozoic to Devonian Canadian Cordilleran sequence of metasedimentary rocks, Thor-Odin dome, southeastern British Columbia

Kuiper

Shields

Tubrett

et al. 2014

Geological Society of America Bulletin

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We present a U-Pb detrital zircon age and provenance study of a sequence of metasedimentary rocks in the northwestern Thor-Odin high-grade gneiss dome within the Omineca crystalline belt of the Canadian Cordillera. Despite strong overprint by defor mation and metamorphism, we successfully analyzed the age and provenance of six samples collected at various structural levels, using U-Pb detrital zircon laser-ablationinductively coupled plasma-mass spectrometry (LA-ICP-MS) analysis.The Thor-Odin dome consists of Paleoproterozoic basement and a metasedimentary cover sequence of previously unknown age and tectonic signifi cance. Our results indicate that the oldest units of this sequence may be Paleoproterozoic, and some of the oldest known metasedimentary rocks in the Canadian Cordillera, originally deposited on top of Laurentian basement rocks. The youngest rocks are Devonian and deposited shortly before the onset of widespread Late Devonian to early Mississippian igneous activity in the Selkirk Domain or Kootenay arc. The cover sequence of the Thor-Odin dome thus preserves some of both the oldest and the youngest (meta)sedimentary rocks deposited between the formation of supercontinent Columbia and the onset of igneous activity and convergence that marked the beginning of Cordilleran deformation and metamorphism. Parts of as many as ~1.4 b.y. of sedimentary history are preserved in the Thor-Odin dome, implying that much information on the sedimentary history of the Canadian Cordillera may be hidden in other Cordi lleran gneiss domes.

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“…Ce n'est qu'en redatant les bordures de zircon des dykes de granite par une autre méthode à haute résolution spatiale (ablation laser) et en combinant ces données à des relations de recoupements systématiques, et à la composition chimique du zircon et de la monazite que l'interprétation initiale, d'une déformation précambrienne (Crowley, 1999), a pu être confirmée (Crowley et al, 2008;Gervais et al, 2010). La datation par ablation laser, de par sa précision de 1-3%, fonctionne bien pour différencier deux évènements tectoniques proches dans les orogènes jeunes comme la Cordillère canadienne ou l'Himalaya, ou deux évènements éloignés dans les orogènes précambriens, mais dans ces derniers, la précision est en limite d'application pour des évènements tectoniques (Rivers et al, 1989;Rivers, 1997Rivers, , 2008Corrigan et al, 2000;Gower et Krogh, 2002;Rivers et al, 2012).…”

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Déformations tardi-grenvilliennes dans la ceinture parautochtone (Province de Grenville centrale) : contraintes géochronologiques par couplage de méthodes U–Pb de haute résolution spatiale et de haute précision

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Tectonic implications for a Cordilleran orogenic base in the Frenchman Cap dome, southeastern Canadian Cordillera

Cited by 24 publications

References 51 publications

Orogenic pulses in the Alberta Rocky Mountains: Radiometric dating of major faults and comparison with the regional tectono-stratigraphic record

Orogenic pulses in the Alberta Rocky Mountains: Radiometric dating of major faults and comparison with the regional tectono-stratigraphic record

Age and provenance of a Paleoproterozoic to Devonian Canadian Cordilleran sequence of metasedimentary rocks, Thor-Odin dome, southeastern British Columbia

Déformations tardi-grenvilliennes dans la ceinture parautochtone (Province de Grenville centrale) : contraintes géochronologiques par couplage de méthodes U–Pb de haute résolution spatiale et de haute précision

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