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Book Chapter

Comparison of tectonic styles in the Mexican and Canadian Rocky Mountain Fold–Thrust Belt

By
Elisa Fitz-Diaz
Elisa Fitz-Diaz
Department of Geology and Geophysics,University of Minnesota310 Pillsbury Drive SE, Minneapolis, MN, 55454,USA
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Peter Hudleston
Peter Hudleston
Department of Geology and Geophysics,University of Minnesota310 Pillsbury Drive SE, Minneapolis, MN, 55454,USA
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Gustavo Tolson
Gustavo Tolson
Depto. de Geología Regional, Instituto de Geología,Universidad Nacional Autónoma de MéxicoAv. Universidad 3000, C. U., Coyoacán,México
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Published:
January 01, 2011

Abstract

Despite the fact that most fold–thrust belts around the world share many features, successfully explained by the critical wedge model, the details of their geometric evolution and tectonic style development are poorly understood. In the classic section of the southern Canadian Rocky Mountains the dominant tectonic style consists of imbricate thrust sheets with relatively little internal deformation of the individual slices. In the Mexican fold–thrust Belt (Central Mexico), the age of deformation, the overall structural pattern and the total amount of shortening are similar, but the individual thrust sheets exhibit much more internal deformation as manifest by metre-scale buckle folds. One of the differences between these localities is the lateral variation of facies resulting in massive platform limestone separated by thinly-bedded basinal limestone in the Central Mexico section. Strain is concentrated toward the margins between platforms and basins. In Canada, thick platform carbonates form continuous resistant units across the Front Range. Possible reasons for the differences in tectonic style between the two sections include the dominant lithology, distribution of lithologies, taper angle of the tectonic wedges, amount of friction along the basal detachment and the degree of anisotropy of the basin facies rocks.

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Contents

Geological Society, London, Special Publications

Kinematic Evolution and Structural Styles of Fold-and-Thrust Belts

J. Poblet
J. Poblet
Universidad de Oviedo, Spain
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R. J. Lisle
R. J. Lisle
Cardiff University, UK
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Geological Society of London
Volume
349
ISBN electronic:
9781862395978
Publication date:
January 01, 2011

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