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The AAPG/Datapages Combined Publications Database

Oklahoma City Geological Society

Abstract


The Shale Shaker
Vol. 65 (2014), No. 2. (March/April), Pages 110-133

Structural Analysis of the Boktukola Syncline, Central Ouachita Mountains, Oklahoma

Aaron Ball

Abstract

A field study was conducted to develop and balance a cross section of the Boktukola Syncline in the central Ouachita Mountains of southeastern Oklahoma. No previous study has produced a balanced cross section to explain how this broad, north-verging syncline between the Boktukola and Octavia Thrust Faults may have developed.

Equal-area stereonets and Bengtson tangent diagrams were used to analyze bedding attitudes measured in the field. These diagrams were constructed to further understand the fold geometries in the study area and to best determine how to project bedding attitudes. The three folds studied were the Nunihchito Anticline, Boktukola Syncline and Big One Anticline.

Three parallel cross sections were constructed using the dip-domain method. These three cross sections show that the structures change along the trend of the fold. Equal-area balancing was used to show that one of the cross sections was geometrically valid and restorable.

Transpression is inferred using the conical folds as kinematic indicators of the dextral shear component along the Boktukola Fault. The Boktukola Fault changes strike west of the study area; as a result, cylindrical folds developed west of the study area as the shear component along the fault aligns with the direction of convergence. East of the study area conical folds are the dominant fold styles as a result of increased shear along the fault.


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