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Geological Society, London, Special Publications; 1981; v. 9; p. 143-149;
DOI: 10.1144/GSL.SP.1981.009.01.12
© 1981 Geological Society of London

II. Rock Products of Thrusting

Dynamic analysis of a small imbricate thrust and related structures, Front Ranges, Southern Canadian Rocky Mountains

J. H. Spang & S. P. Brown

Department of Geology, University of Calgary, Alberta, T2N IN4 Canada
Mobil Oil Canada Ltd., Box 800, Calgary, Alberta, T2P 2J7 Canada

The thrust is a hanging-wall imbricate of the Lac des Arcs Thrust within the McConnell Thrust Plate. The small imbricate terminates vertically into a cylindrical, macroscopic kink band and laterally by merging with the Lac des Arcs Thrust. Numerical dynamic analysis of calcite and dolomite twin lamellae gives a near layer parallel maximum principal compression and an extension at a high angle to layering, both in the transport direction. The twinning is considered to be late stage. Reorientation of the principal axes occurs near folds and other minor thrusts in the area.