Tectonic assemblage map of the Canadian Cordillera and adjacent parts of the United States of America

Wheeler, J O; McFeely, P

doi:10.4095/133549

Cited by 126 publications

(101 citation statements)

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“…Good geological information was available (e.g. Monger 1989;Wheeler and McFeeley 1991;Gabrielse et al 1992). Surface structures provided evidence of 25 km or more of structural relief.…”

Section: Monashee Mountains Of the Southern Cordilleramentioning

confidence: 99%

“…This development generated well-studied surface rocks that consist of North American marginal strata ranging in age from Paleoproterozoic to Paleozoic, pericratonic and allochthonous terranes accreted during Mesozoic to Paleogene orogenesis, and synorogenic to postorogenic igneous and sedimentary rocks (Fig. 5;Wheeler and McFeeley 1991;Gabrielse et al 1992). Accretion resulted in east-northeast contraction followed by a series of northwest-striking dextral strike-slip faults, the most prominent of which is the Tintina Fault-Northern Rocky Mountain Trench (TF-NRMT) fault system.…”

Section: Intermontane Superterrane Northern Cordilleramentioning

confidence: 99%

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Logan Medallist 2. Geophysics and Geology: An Essential Combination Illustrated by LITHOPROBE Interpretations–Part 1, Lithospheric Examples

Clowes¹

2015

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“…Good geological information was available (e.g. Monger 1989;Wheeler and McFeeley 1991;Gabrielse et al 1992). Surface structures provided evidence of 25 km or more of structural relief.…”

Section: Monashee Mountains Of the Southern Cordilleramentioning

confidence: 99%

Section: Intermontane Superterrane Northern Cordilleramentioning

confidence: 99%

Logan Medallist 2. Geophysics and Geology: An Essential Combination Illustrated by LITHOPROBE Interpretations–Part 1, Lithospheric Examples

Clowes¹

2015

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“…The remnants of this basin are preserved today in a discontinuous belt along the eastern edge of the Yukon-Tanana terrane and called the Slide Mountain terrane (Wheeler and McFeely 1991;Mortensen 1992;Pigage 2004;Colpron et al 2006a;Piercey et al 2012). In southeastern Yukon, the Slide Mountain terrane is found as fault-bounded slivers of oceanic lithosphere preserved between the Yukon-Tanana terrane and the underlying North American margin.…”

Section: Regional Geologic Settingmentioning

confidence: 99%

Geologic Setting of Eclogite-facies Assemblages in the St. Cyr Klippe, Yukon–Tanana Terrane, Yukon, Canada

Petrie

Gilotti

McClelland

et al. 2015

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SUMMARYThe St. Cyr area near Quiet Lake hosts well-preserved to variably retrogressed eclogite found as sub-metre to hundreds of metre-long lenses within quartzofeldspathic schist in southcentral Yukon, Canada. The St. Cyr klippe consists of structurally imbricated, polydeformed and polymetamorphosed units of continental arc crust and ultramafic-mafic rocks. Eclogite-bearing quartzofeldspathic schist forms thrust slices in a 30 km long by 6 km wide, northwest-striking outcrop belt. The schist unit comprises metasedimentary and felsic intrusive rocks that are intercalated on the metre to tens of metres scale. Ultramafic rocks, serpentinite and associated greenschist-facies metagabbro form imbricated tectonic slices within the eclogite-bearing quartzofeldspathic unit, which led to a previously held hypothesis that eclogite was exhumed within a tectonic mélange. The presence of phengite and Permian zircon crystallized under eclogite-facies metamorphic conditions in the quartzofeldspathic host rocks indicate that the eclogite was metamorphosed in situ together with the schist as a coherent unit that was part of the continental arc crust of the Yukon-Tanana terrane, rather than a mélange associated with the subduction of oceanic crust of the Slide Mountain terrane. Petrological, geochemical, geochronological and structural similarities link St. Cyr eclogite to other high-pressure localities within Yukon, indicating the high-pressure assemblages form a larger lithotectonic unit within the Yukon-Tanana terrane. Geoscience Canada, v. 42, http://www.dx

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“…The Cassiar terrane consists of a Late Proterozoic to lower Paleozoic continental margin succession that has been interpreted as a parautochthonous segment of the North American miogeocline displaced along the Tintina fault (e.g., Wheeler and McFeely 1991). The Cassiar terrane in central Yukon is represented by siliciclastic rocks of the Late Proterozoic to Early Cambrian Ingenika Group and Boya Formation.…”

Section: Cassiar Terranementioning

confidence: 99%

“…The Yukon-Tanana terrane is the easternmost and largest of the pericratonic terranes accreted to the Paleozoic northwestern margin of North America (e.g., Coney et al 1980;Wheeler and McFeely 1991). It consists of Late Devonian to Middle Permian metaigneous and metasedimentary rocks that record the evolution of a continental arc and back-arc system built upon a pre-Late Devonian metasedimentary basement (Mortensen 1992;Colpron and Yukon-Tanana Working Group 2001;Piercey et al 2002).…”

Section: Yukon-tanana Terranementioning

confidence: 99%

Geology and juxtaposition history of the Yukon-Tanana, Slide Mountain, and Cassiar terranes in the Glenlyon area of central Yukon

Colpron

Gladwin²,

Johnston

et al. 2005

Can. J. Earth Sci.

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Abstract:In central Yukon, the pericratonic Yukon-Tanana terrane (YT) is juxtaposed with the Cassiar terrane (CT, parautochthonous North America) along the Tummel fault zone (TFZ), a 3-4 km wide, northwest-trending belt comprising imbricate fault slices of Slide Mountain terrane (SM, greenstone, chert, serpentinite) and synorogenic clastic rocks. Northeast of the TFZ, the CT comprises Paleozoic metapelitic rocks, marble, and amphibolite of continental margin affinity. To the southwest, the YT consists of a pre-Late Devonian metasedimentary complex overlain and intruded by Mississippian clastic, volcanic, and plutonic successions of continental arc affinity. In the TFZ, Middle to Late Permian ocean-floor basalt of the SM shows evidence of crustal contamination, suggesting deposition at the edge of a marginal ocean basin. Deformation features in the TFZ include early ductile fabrics overprinted by younger brittle structures. Triassic synorogenic clastic rocks in the TFZ, and at the base of a klippen above the YT, suggest that terrane imbrication began shortly after the Early Triassic.40 Ar/ 39 Ar mica ages from the region suggest cooling of the YT, SM, and part of CT below 300°C by Early Jurassic time. Pervasive brittle structures in the Ragged Lake klippe, which roots into the TFZ, indicate brittle thrusting of the SM over the CT in post-Triassic time. Early Cretaceous plutons intrude the CT (Glenlyon Batholith) and the TFZ (leucogabbro) and impose a contact aureole that extends westward into the YT. Steep brittle structures that deformed the TFZ also affect, in part, the Glenlyon Batholith but do not significantly offset its contact aureole. Consequently, little displacement can have occurred along the TFZ after Early Cretaceous time.Résumé : Dans le centre du Yukon, le terrane péricratonique Yukon-Tanana (YT) est juxtaposé au terrane Cassiar (CTAmérique du Nord parautochtone) le long de la zone de faille Tummel (TFZ) -une ceinture de 3 à 4 km de large, à tendance nord-ouest et comprenant des tranches de faille imbriquées du terrane de Slide Mountain (SM -roches vertes, chert, serpentinite) et des roches clastiques synorogéniques. Au nord-est de la TFZ, le CT comprend des roches métapélitiques, du marbre et des amphibolites d'affinité de bordure continentale datant du Paléozoïque. Vers le sud-ouest, le YT comprend un complexe métasédimentaire datant du pré-Dévonien tardif; des successions volcaniques et plutoniques, d'affinité d'arc continental, datant du Mississippien, le recouvrent et le pénètrent. Dans la TFZ, un basalte de plancher océanique (Permien moyen à tardif) du terrane de SM montre des évidences de contamination crustale suggérant une déposition à la bordure d'un bassin océanique. Les caractéristiques de déformation dans la TFZ comprennent une surimpression des textures ductiles précoces par des structures cassantes plus jeunes. Les roches clastiques synorogéniques (Trias) dans la TFZ et à la base d'une klippe au-dessus du YT, indiqueraient que l'imbrication des terranes a débuté peu de temps après l...

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Tectonic assemblage map of the Canadian Cordillera and adjacent parts of the United States of America

Cited by 126 publications

References 0 publications

Logan Medallist 2. Geophysics and Geology: An Essential Combination Illustrated by LITHOPROBE Interpretations–Part 1, Lithospheric Examples

Logan Medallist 2. Geophysics and Geology: An Essential Combination Illustrated by LITHOPROBE Interpretations–Part 1, Lithospheric Examples

Geologic Setting of Eclogite-facies Assemblages in the St. Cyr Klippe, Yukon–Tanana Terrane, Yukon, Canada

Geology and juxtaposition history of the Yukon-Tanana, Slide Mountain, and Cassiar terranes in the Glenlyon area of central Yukon

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