Obduction, backfolding and piggyback thrusting in the metamorphic hinterland of the southeastern Canadian Cordillera

Brown, Richard L.; Journeay, J M; Lane, L S; Murphy, Donald C.; Rees, Chris

doi:10.1016/0191-8141(86)90047-7

Cited by 160 publications

(56 citation statements)

References 37 publications

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“…6). Examples of such a superposition of tectonic-metamorphic conditions encompass the Caledonides exposed in Norway (Andersen, 1998;Labrousse et al, 2002), the Hercynian belt of western Europe (Vanderhaeghe et al, 1999a;Lardeaux et al, 2001;Ledru et al, 2001;Solgadi et al, 2007;Gardien et al, 2011), the CircumPacific Canadian Cordillera (Brown et al, 1986;Vanderhaeghe and Teyssier, 1997;Vanderhaeghe et al, 1999b;Norlander et al, 2002;Mihalynuk et al, 2004), the Aegean domain in Greece (Lister et al, 1984;Buick and Holland, 1989;Buick, 1991;Gautier and Brun, 1994;Avigad, 1998;Duchêne et al, 2006) and the higherHimalayan Crystallines . The duration of the HT conditions and partial melting of the orogenic crust is recorded by the age spread of granites issued from the mid to lower crust and emplaced at higher structural levels.…”

Section: Relative Timing Of Hp/lt and Ht Metamorphismmentioning

confidence: 97%

The thermal–mechanical evolution of crustal orogenic belts at convergent plate boundaries: A reappraisal of the orogenic cycle

Vanderhaeghe

2012

Journal of Geodynamics

154

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Section: Relative Timing Of Hp/lt and Ht Metamorphismmentioning

confidence: 97%

The thermal–mechanical evolution of crustal orogenic belts at convergent plate boundaries: A reappraisal of the orogenic cycle

Vanderhaeghe

2012

Journal of Geodynamics

154

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“…The Monashee decollement has been interpreted as a thrust responsible for the displacement of the Selkirk allochthon, also referred to as the Kootenay terrane, towards the NE over the Mona hee complex (e.g. Brown, 1980;Duncan, 1984;Brown et al, 1986;Price, 1986). The Selkirk allochthon is composed of an overturned sedimentary sequence comprising discontinuou layers of an amphibolite-facies assemblage of pelite, psammite, calc-silicate, marble, amphibolite, and quartzite, which are part of a large scale east-verging nappe structure (Reesor & Moore, [97 I;Raeside & Simony, 1983;Duncan, 1984;Scammel & Brown, 1991;Crowley & Brown, 1994;McNicoll & Brown, 1995).…”

Section: The Monashee Decollement and The Selkirk Allochthonmentioning

confidence: 99%

Formation of the Shuswap metamorphic core complex during late-orogenic collapse of the Canadian Cordillera: Role of ductile thinning and partial melting of the mid-to lower crust

Vanderhaeghe

Teyssier

1997

Geodinamica Acta

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The early Tertiary evolution of the Shuswap metamorphic core complex is characterised by low-angle crustal detachments and nearly isothermal decompression followed by rapid cooling of rocks in the footwall of the detachments. Previous work as well as our own observations suggest that Paleogene late-orogenic extension produced the main tectonic features of the region. Furthermore, structural analysis of the migmatites and published geochronological data indicate that partial melting of the mid-to lower crust was coeval with extension in the upper crustal levels, suggesting that these two processes are linked genetically. Consequently, we propose that the formation of the Shuswap metamorphic core complex corresponds to late-orogenic gravitational collapse of the Canadian Cordillera accommodated by normal faulting of the brittle upper crust and by ductile thinning of the mid-to lower crust. The initiation and amplification of extension during the Paleocene in the Shuswap metamorphic core complex are tentatively related to partial melting of the thickened crust which caused drastic mechanical weakening of the crust. RESUME. -L'evolution durant Ie Tertiaire du complexe metal1'lorphique du Shuswap est marquee par la formation de detachements crustaux subhorizontaux au-dessous dcsquels les roches ont subi une decompression quasi-isothennique, suivie d'un refroidissement tres rapide. L'etude des travaux publies sur Ie complexe metamorphique du Shuswap, ainsi que nos .observations de terrain, montrent que I'extension Department of Geology and Geophysics, University of Minnesota, Minneapolis, MN 55455 USA tardi-orogenique paleogene est 11 l'origine des structures majeures de cette region. L'analyse structurale des migmatites et les donnees geochronologiques indiquent que la fusion crustale fut synchrone de l'extension de la croute superieure, ce qui suggere que ces deux processus sont lies genetiquement. En consequence, nous proposons que la formation du complexe metamorphique du Shuswap corresponde 11 I'effondrement gravitaire de la Cordillere canadienne accommode par extension fragile de la croute superieure et par I'amincissement ductile de la croute mediane 11 inferieure. Nous proposons egalement que l'initiation et l'amplification de I'extension orogenique durant Ie Paleocene dans Ie complexe du Shuswap sont liees 11 la fusion de cette croute epaissie qui entralne un amollissement catastrophique de la croute.Mots des: Effondrement tardi-orogenique, metamorphic core complex, Shuswap, fusion partielie, migmatites, Cordillere canadienne, Colombie Britannique.

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“…Similarly, the vergence of folds is generally toward the foreland and consistent with the vergence of the entire fold and thrust belt. However, many examples exist of antithetic thrust faults (e.g., Serra, 1977;Banks and Warburton, 1986;Price, 1986;Vann et al, 1986;Lawton et al, 1994) and hinterland-vergent folds (e.g., Heim, 1922;Brown et al, 1986;Macaya et al, 1991) that, apparently, have formed by displacements opposite to the general sense of tectonic transport of the fold and thrust belt. These structures, generally called "back thrusts" and "back folds," respectively, are probably the result of the same kinematic framework, but the back thrusts most likely form at shallow levels where rocks behave in a brittle fashion, whereas back folds form at greater depths where ductile flow becomes dominant.…”

Section: Introductionmentioning

confidence: 97%

Antithetic shear and the formation of back folds in the central Brooks Range fold and thrust belt, Alaska

Lallemant

Oldow

1998

Architecture of the Central Brooks Range Fold and Thrust Belt, Arctic Alaska

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The Brooks Range of northern Alaska is a north-vergent fold and thrust belt formed in Late Jurassic to Tertiary time. Although the north-directed transport is recognized and evidenced by ubiquitous macro-, meso-, and microscopic structures, antithetic, south-vergent folds occur, attesting to relative, but not necessarily absolute, south-directed tectonic transport. These back folds are mainly the result of strain incompatibilities related to northward displacement across a ramp and the formation of an antiformal-stack duplex.

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Obduction, backfolding and piggyback thrusting in the metamorphic hinterland of the southeastern Canadian Cordillera

Cited by 160 publications

References 37 publications

The thermal–mechanical evolution of crustal orogenic belts at convergent plate boundaries: A reappraisal of the orogenic cycle

The thermal–mechanical evolution of crustal orogenic belts at convergent plate boundaries: A reappraisal of the orogenic cycle

Formation of the Shuswap metamorphic core complex during late-orogenic collapse of the Canadian Cordillera: Role of ductile thinning and partial melting of the mid-to lower crust

Antithetic shear and the formation of back folds in the central Brooks Range fold and thrust belt, Alaska

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