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Mesoscale Deformation Fabrics in a Fault-Propagation Fold, Southern Livingstone Range, Alberta, Preliminary Observations

Preliminary investigation of a fault-propagation fold exposed at Green Creek in the southern Livingstone Range reveals a series of mesoscale structures that formed during the development of the Green Creek anticline. The oldest structures are duplexes that developed at specific stratigraphic horizons in the hinge region of the fold. Subsequent deformation involved the formation of backthrusts in the steeply dipping forelimb, which may have been concurrent with tightening of the fold by bedding-paral lel flexural slip. The hinge region duplexes and forelimb backthrusts are cut by the Green Creek thrust which propagated through the forelimb of the fold just below the hinge region, taking advantage of pre-existing fractures. The latest episode of deformation is represented by locally developed steeply-dipping small scale faults which strike ENE and cut the anticline at a high angle. A few fault planes exhibit subhorizontal or gently plunging slickensides and rarely exhibit an apparent dextral offset on the order of several metres. Future work will include a comprehensive examination of faults, fractures and veins that formed during the evolution of the Green Creek anticline to model the hydrodynamics o f formation fluids. Geochemical analyses of vein minerals associated with each episode of deformation is proposed to determine the fluid chemistry evolution, which will provide information on temperature and depth during particula r stages of deformation.