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The west-verging fold and thrust belt of the Central Labrador Trough originated as a part of the New Quebec Orogen from rift inversion as a result of oblique collision and dextral transpression between the Archean Superior craton and the Archean block of the Core Zone during the Trans-Hudson orogeny (1.82−1.77 Ga). The structures associated with dextral transpression are well established in the northern segment of the orogen but not in the central part. We present new field structural observations along the ca. 70 km long W−E Minowean-Romanet transect that include not only elements of thrust tectonics but also previously undocumented examples of strike-slip shear zones and late brittle, semi-brittle and ductile extensional structures which occurred both in the frontal and rear parts of the thrust wedge. The newly described low-angle mineral lineation, axes of cylindrical folds and dextral mylonitic shear zones in the footwall of the Romanet Fault are oriented subparallel to the orogen and reflect the early phase of oblique convergence. Mineral lineations and striations on planes of normal faults in the hanging wall of the Romanet Fault are oriented orthogonal to the orogen and correspond to a later phase of exhumation driven by the combined effects of erosion and underplating. To explain the increase in the degree of exhumation along the orogen in the study area from NW to SE, we propose a model of strain partitioning and differential exhumation that resulted from longitudinal variations of shortening and erosion under an oblique convergence setting.RESUMELa partie centrale de la ceinture de plissement et de chevauchement de la Fosse du Labrador de vergence vers l’ouest fait partie integrante de l’Orogene du Nouveau-Quebec, et resulte de la collision oblique avec transpression dextre entre le craton Superieur archeen et le bloc archeen de la Zone noyau pendant l’Orogenese trans-hudsonienne (1.82−1.77 Ga). Les structures associees a la transpression dextre sont bien etablies dans la partie nord de l’orogene mais pas dans la partie centrale. Nous presentons de nouvelles observations structurales de terrain le long de la traverse ouest−est Minowean-Romanet d’environ 70 km de long, qui comprennent non seulement des evidences de tectonique de chevauchement, mais egalement des exemples encore non documentes de zones de cisaillement ductile et de structures d’extension fragiles, demi-fragiles et ductiles a la fois dans les parties frontales et arriere du prisme d’accretion tectonique. La lineation minerale a faible plongement recemment decrite, les axes de plis cylindriques et les zones de cisaillement mylonitique dextre dans le compartiment inferieur de la faille de Romanet sont subparalleles a l’orogene et refletent une phase precoce de la convergence oblique. La lineation et les stries minerales sur les plans des failles normales dans le compartiment superieur de la faille de Romanet sont orientees orthogonalement a l’orogene et correspondent a la phase ulterieure d’exhumation induite par les effets combines de l’erosion et de l’accretion basale. Pour expliquer l’augmentation du degre d’exhumation le long de l’orogene du nord-ouest au sud-est dans la zone d’etude, nous proposons un modele de partitionnement de la deformation et de l’exhumation differentielle resultant des variations longitudinales du raccourcissement et de l’erosion dans un contexte de convergence oblique.

geoscience canada

Structural Features of the Central Labrador Trough: A Model for Strain Partitioning, Differential Exhumation and Late Normal Faulting in a Thrust Wedge under Oblique Shortening