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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
2014. The American Association of Petroleum Geologists. All rights reserved.
DOI:10.1306/05311312006
Fault
displacement-distance relationships as indicators of contractional
fault
-related folding style




Amanda N. Hughes,1 John H. Shaw2
1Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, Massachusetts 02138; ahughes@post.harvard.edu
2Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, Massachusetts 02138; shaw@eps.harvard.edu
ABSTRACT
We present a method of using fault
displacement-distance profiles to distinguish
fault
-bend, shear
fault
-bend, and
fault
-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
fault
-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).
Fault
-bend folds exhibit constant displacement along
fault
segments and changes in displacement associated with bends in faults, shear
fault
-bend folds demonstrate an increase in displacement through the shearing interval, and
fault
-propagation folds exhibit decreasing displacement toward the
fault
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
fault
-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
fault
-related folding.
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