Tectonic evolution of the Fundy rift basin, Canada: evidence of extension and shortening during passive margin development

Article Abstract:

The shortening of the Fundy basin in Canada is the result of tectonic processes connected with seafloor spreading. Seismic data indicate that the Fundy basin in southern Canada has been affected by two deformations during the Mesozoic period. The first, which occurred between Middle Triassic and Early Jurassic period, caused extension, while the second deformation, occurring in Jurassic or Early Cretaceous era, resulted in shortening along all the faulted margins of the Fundy basin.

Research, Canada, Basins (Geology), Sea-floor spreading

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Crustal-scale shortening and extension across the Grenville Province of western Quebec

Article Abstract:

Images from seismic reflection surveys reveal the well-defined crust-mantle boundary and Grenville terranes of the Grenville Province, western Quebec. The 36 km thick crust beneath the Grenville Front underwent southeastward thickening to a maximum thickness of 50 km. The Grenville collision was responsible for the extensive thickening. The thickening was followed by an extension along the low-angle southeast dipping shear zones producing the present Moho topography.

Quebec, Mohorovicic discontinuity

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Regional shortening fabrics in eastern North America: far-field stress transmission from the Appalachian-Ouachita orogenic belt

Article Abstract:

Bedding-parallel, subhorizontal shortening strains, as preserved by twinned calcite in Paleozoic carbonates that cover cratonic eastern North America are perpendicular to the orogenic sites of the Appalachian and Ouachita mountains. Moreover, the shortening strain magnitudes and the calcite twinning differential stress magnitudes decrease exponentially away from the orogenic front.

Appalachian Mountains, Ouachita Mountains

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