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Growth trishear model and its application to the Gilbertown graben system, southwest Alabama

Journal of Structural Geology
By: , , and 
https://doi.org/10.1016/j.jsg.2008.09.006

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Abstract

Fault-propagation folding associated with an upward propagating fault in the Gilbertown graben system is revealed by well-based 3-D subsurface mapping and dipmeter analysis. The fold is developed in the Selma chalk, which is an oil reservoir along the southern margin of the graben. Area-depth-strain analysis suggests that the Cretaceous strata were growth units, the Jurassic strata were pregrowth units, and the graben system is detached in the Louann Salt. The growth trishear model has been applied in this paper to study the evolution and kinematics of extensional fault-propagation folding. Models indicate that the propagation to slip (p/s) ratio of the underlying fault plays an important role in governing the geometry of the resulting extensional fault-propagation fold. With a greater p/s ratio, the fold is more localized in the vicinity of the propagating fault. The extensional fault-propagation fold in the Gilbertown graben is modeled by both a compactional and a non-compactional growth trishear model. Both models predict a similar geometry of the extensional fault-propagation fold. The trishear model with compaction best predicts the fold geometry. ?? 2008 Elsevier Ltd. All rights reserved.
Publication type Article
Publication Subtype Journal Article
Title Growth trishear model and its application to the Gilbertown graben system, southwest Alabama
Series title Journal of Structural Geology
DOI 10.1016/j.jsg.2008.09.006
Volume 31
Issue 9
Year Published 2009
Language English
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Journal of Structural Geology
First page 926
Last page 940
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