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GEOREF RECORD

Along-strike variations and internal details of chevron-style, flexural-slip thrust-propagation folds within the southern Livingstone Range anticlinorium, a paleohydrocarbon reservoir in southern Alberta Foothills, Canada

Michael A. Cooley, Raymond A. Price, John M. Dixon and T. Kurtis Kyser
Along-strike variations and internal details of chevron-style, flexural-slip thrust-propagation folds within the southern Livingstone Range anticlinorium, a paleohydrocarbon reservoir in southern Alberta Foothills, Canada
AAPG Bulletin (November 2011) 95 (11): 1821-1849

Abstract

The Livingstone Range anticlinorium marks a hanging-wall ramp across which the Livingstone thrust cuts up eastward approximately 1000 m ( approximately 3280 ft) between regional decollements in the Devonian and the Jurassic strata. It is well exposed and provides actualistic models for exploration of analogous subsurface structures. More than 30 km (<19 mi) of detailed mapping along strike reveals generally gradual changes, punctuated by abrupt terminations or offsets of structures at northeast- to east-trending tear faults, interpreted to be reactivated basement faults. Some folds plunge out at tear faults, forming domal culminations between them. Hinge zones of chevron-style, flexural-slip thrust-propagation folds display a distinctive pattern of ramp-flat thrusting comprising stacked detachment thrusts, each of which emerges from a different zone of interbed slip in the backlimb and deflects the hinge zone eastward. Each successively lower detachment thrust dies out in the hinge zone just below an overlying one. Displacements on the detachments, rotation of fold limbs, and interbed flexural slip were integrated kinematically. Thrust-propagation folding involved a form of cataclastic flow: individual blocks of rock delimited by faults, joints, and sheared bedding surfaces underwent minor relative displacements with little or no internal deformation, despite large translations and rotations of the thrust sheet. Pressure solution and vein formation were widespread but were minor components of the deformation. Complex fracturing within the anticlines is dominated by conspicuous widely spaced ( approximately 150 m [ approximately 490 ft]) transverse (east-northeast-striking) zones of intense fracturing that transect hinge zones and limbs. These permeable zones likely originated by reactivation of basement faults, and their significance may not be predictable by curvature analysis.


ISSN: 0149-1423
EISSN: 1558-9153
Coden: AABUD2
Serial Title: AAPG Bulletin
Serial Volume: 95
Serial Issue: 11
Title: Along-strike variations and internal details of chevron-style, flexural-slip thrust-propagation folds within the southern Livingstone Range anticlinorium, a paleohydrocarbon reservoir in southern Alberta Foothills, Canada
Affiliation: Queen's University, Department of Geological Sciences and Geological Engineering, Kingston, ON, Canada
Pages: 1821-1849
Published: 201111
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
References: 31
Accession Number: 2011-091634
Categories: Structural geology
Document Type: Serial Map
Bibliographic Level: Analytic
Illustration Description: illus. incl. sect., strat. col., geol. sketch maps
N49°00'00" - N50°00'00", W109°00'00" - W108°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201149
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