Three-dimensional collisional structure of the Trans-Hudson Orogen, Canada

Lucas, Stephen Bernard; White, Don; Hajnal, Z.; Lewry, John F.; Green, A.; Clowes, Ron M.; Zwanzig, H. V.; Ashton, K; Schledewitz, D C P; Stauffer, Mel R.; Norman, Anthony Richard; Williams, Peter; Spence, G. D.

doi:10.1016/0040-1951(94)90082-5

Cited by 66 publications

(28 citation statements)

References 19 publications

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“…Solutions of Euler equation give depths near 30km for this feature to the south. This is in agreement with the interpretation of seismic profiles of CO-CORP [Nelson et al, 1993] and LITHOPROBE [Lucas et al, 1994]. The Tabbernor Tabbernor fault is N=0.5 to 1.5, ZQ = 8 to 27 km and a constant phase of 50° in the West direction.…”

Section: Depth To Magnetic Basementsupporting

confidence: 90%

Analysis of gravity and magnetic fields in the Canadian Shield using standard and wavelet-based methods

Bourlon¹

2004

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Section: Depth To Magnetic Basementsupporting

confidence: 90%

Analysis of gravity and magnetic fields in the Canadian Shield using standard and wavelet-based methods

Bourlon¹

2004

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“…The THO is a collisional orogenic belt extending from central North America across Hudson Bay to the eastern edge of the continent, suturing various Archean cratons and associated Paleoproterozoic supracrustal sequences forming Laurentia (Nuna) (Hoffman 1988;Lewry and Collerson 1990). Generally, this orogen is defined by a peak tectono-thermal overprint from 1.83 to 1.80 Ga (Bickford et al 1994); however, the northeastern segment of the THO preserves evidence for polycyclic metamorphism and deformation accounting for several stages of collision from 1.91 to 1.81 Ga Lucas et al 1994;St-Onge et al 2006;Corrigan et al 2009). The Snowbird tectonic zone records an early period of high-grade metamorphism at ca.…”

Section: Paleoproterozoic Geology and The Effects Of The Trans-hudsonmentioning

confidence: 98%

Origin and tectonometamorphic history of the Repulse Bay block, Melville Peninsula, Nunavut: exotic terrane or deeper level of the Rae craton?

et al. 2014

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The Rae craton on Melville Peninsula, Nunavut, comprises several lithotectonic domains, including a structurally and lithologically distinct yet poorly known crustal terrane, the Repulse Bay block (RBb). This study presents new lithological and petrographic observations, combined with U-Pb zircon data, to better understand the Archean and Paleoproterozoic crustal evolution of the RBb. The new data demonstrate that the central-eastern RBb consists of the following: (i) upper amphibolite-to granulite-facies, ca. 2.73-2.71 Ga intermediate granitoid gneisses and gabbroic sheets; (ii) ca. 2.69 Ga two-pyroxene charnockite to enderbite intrusions; and (iii) thin slivers of both Archean and Paleoproterozoic supracrustal rocks. Inherited zircon also attests to the presence of a Mesoarchean to Paleoarchean substrate. A semi-pelitic gneiss from one of the Paleoproterozoic supracrustal panels was deposited sometime after ca. 1.89 Ga and shows a similar detrital zircon age profile to a <1.92 Ga semi-pelitic gneiss from the Lyon Inlet boundary zone at the northern extent of the RBb. Zircon in most rocks analyzed record metamorphism related to the Trans-Hudson orogeny between ca. 1.84 and 1.82 Ga. Results from this study are most consistent with the RBb, representing a piece of lower to middle crustal level of the Rae craton, rather than a distinct and separate crustal entity (i.e., an exotic block).Résumé : Le craton de Rae, sur la péninsule de Melville, au Nunavut, comprend plusieurs domaines lithotectoniques, incluant le bloc de Repulse Bay (RBb), un terrane crustal mal connu, à structure et lithologie distinctes. Cette étude présente de nouvelles observations lithologiques et pétrographiques, combinées à des données U-Pb déterminées sur des zircons, afin de mieux comprendre l'évolution crustale du RBb à l'Archéen et au Paléoprotérozoïque. Les nouvelles données démontrent que le RBb centre-est comprend : (i) des gneiss granitoïdes intermédiaires et des feuillets de gabbro au faciès des amphibolites supérieur au faciès des granulites, datant d'environ 2,73 à 2,71 Ga, (ii) deux intrusions de pyroxène, de charnockite à enderbite, datant d'environ 2,69 Ga et (iii) de minces échardes de roches supracrustales, datant de l'Archéen et du Paléoprotérozoïque. Des zircons hérités attestent aussi la présence d'un substrat mésoarchéen à paléoarchéen. Un gneiss semi-pélitique provenant de l'un des panneaux supracrustaux (Paléoprotérozoïque) a été mis en place quelque temps après~1,89 Ga et il a un profil d'âge de zircon détritique similaire à celui d'un gneiss semipélitique, <1,92 Ga, de la zone bordure de l'anse Lyon à l'extrémité nord du RBb. Dans la plupart des roches analysées, le zircon enregistre le métamorphisme relié à l'orogène trans-hudsonien entre~1,84 et 1,82 Ga. Les résultats de cette étude concordent très bien avec le fait que le RBb représente une partie du niveau inférieur à moyen de la croûte du craton de Rae, plutôt qu'une entité crustale distincte et séparée (c.-à-d. un bloc exotique). [Traduit par le Rédaction]

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“…The sites considered in this study cross a number of internal units of the Reindeer Zone: the Flin Flon belt, Hanson Lake block, Glennie domain, La Ronge domain and Rottenstone domain as well as a number of faults and shear zones including the Sturgeon-Weir shear zone, Tabbernor fault, and Stanley fault. This profile defined by the MT sites is of particular interest since it crosses the interpreted position of the buried Archean Sask craton, and Lucas et al 1994). WD, Wollaston domain; WB, Wathaman batholith; RD, Rottenstone domain; LRD, La Ronge domain; GD, Glennie domain; HLB, Hanson Lake block; KD, Kisseynew domain (Kisseynew Gneiss Belt); FFB, Flin Flon belt; SBZ, Superior boundary zone; TF, Tabbernor fault; W, window of exposed Archean rock.…”

Section: Introductionmentioning

confidence: 98%

Electrical-resistivity imaging of the central Trans-Hudson orogen

Ferguson¹,

Stevens²,

Jones³

2005

Can. J. Earth Sci.

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Magnetotelluric (MT) measurements were made on a profile across the Trans-Hudson orogen in 1992 as part of the Lithoprobe transect. The present study includes analysis of results from a 300 km-long section of the profile in which allocthonous Paleoproterozoic juvenile terranes and arc rocks of the western Trans-Hudson orogen have been juxtaposed against the Archean Sask craton. Impedance tensor decomposition of data from the 40 MT sites in the area indicates a geoelectric strike of N28°E. Two-dimensional inversion of the data using a non-linear conjugate gradient algorithm provided images of the resistivity structure. Resistivity images reveal that the crust of the Sask craton is relatively resistive

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Three-dimensional collisional structure of the Trans-Hudson Orogen, Canada

Cited by 66 publications

References 19 publications

Analysis of gravity and magnetic fields in the Canadian Shield using standard and wavelet-based methods

Analysis of gravity and magnetic fields in the Canadian Shield using standard and wavelet-based methods

Origin and tectonometamorphic history of the Repulse Bay block, Melville Peninsula, Nunavut: exotic terrane or deeper level of the Rae craton?

Electrical-resistivity imaging of the central Trans-Hudson orogen

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