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AAPG Bulletin

Abstract

AAPG Bulletin, V. 98, No. 2 (February 2014), P. 227251.

Copyright copy2014. The American Association of Petroleum Geologists. All rights reserved.

DOI:10.1306/05311312006

Previous HitFaultNext Hit displacement-distance relationships as indicators of contractional Previous HitfaultNext Hit-related folding style

Amanda N. Hughes,1 John H. Shaw2

1Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, Massachusetts 02138; [email protected]
2Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, Massachusetts 02138; [email protected]

ABSTRACT

We present a method of using Previous HitfaultNext Hit displacement-distance profiles to distinguish Previous HitfaultNext Hit-bend, shear Previous HitfaultNext Hit-bend, and Previous HitfaultNext Hit-propagation folds, and use these insights to guide balanced and retrodeformable interpretations of these structures. We first describe the displacement profiles associated with different end-member Previous HitfaultNext Hit-related folding models, then provide examples of structures that are consistent with these model-based predictions. Natural examples are imaged in high-resolution two- and three dimensional seismic reflection data sets from the Niger Delta, Sichuan Basin, Sierras Pampeanas, and Cascadia to record variations in displacement with distance updip along faults (termed displacement-distance profiles). Previous HitFaultNext Hit-bend folds exhibit constant displacement along Previous HitfaultNext Hit segments and changes in displacement associated with bends in faults, shear Previous HitfaultNext Hit-bend folds demonstrate an increase in displacement through the shearing interval, and Previous HitfaultNext Hit-propagation folds exhibit decreasing displacement toward the Previous HitfaultNext Hit tip. More complex structures are then investigated using this method, demonstrating that displacement-distance profiles can be used to provide insight into structures that involve multiple Previous HitfaultNext Hit-related folding processes or have changed kinematic behavior over time. These interpretations are supported by comparison with the kinematics inferred from the geometry of growth strata overlying these structures. Collectively, these analyses illustrate that the displacement-distance approach can provide valuable insights into the styles of Previous HitfaultTop-related folding.

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