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Mechanism and Mechanics of Multiple Strike-slip Fault Sets

This topic has been dealt with under various categories. A partial list of them are given in the links below. Two case studies are also included in the list. The related conceptual and mechanical models can be summarized as follows: Conjugate Strike-slip Faults and apparent Conjugate Strike-slip Faults, with the latter being basically sequential shearing under a rotated stress field, again, described in detail at several links provided below.

Figure 1 from Rawnsley et al. (1998) among others is a good example for this mechanism.

Evolution of strike-slip fault network from shearing of joints of various phases in the Mesozoic sedimentary rocks exposed at Bristol Channel, UK. From Rawnsley et al. 1998.Figure 1. Evolution of strike-slip fault network from shearing of joints of various phases in the Mesozoic sedimentary rocks exposed at Bristol Channel, UK. From Rawnsley et al. 1998.

Figure 2 from Bourne and Willemse (2001) is a model for strike-slip faulting and the related jointing in the same area. Both of these models address primarily fracturing associated with strike-slip faults, but the fractures in the field all have shear displacements primarily in a strike-slip sense.

Fracture network development from two sets of strike-slip faults (through-going systematic and secondary sets) at Nash Point, eastern Bristol Channel (UK) using linear elastic model and a combined Griffith-Coulomb failure criterion. It is likely that the secondary set developed from initial splay fractures associated with the shearing of the systematic or through-going set. From Bourne and Willemse (2001).Figure 2. Fracture network development from two sets of strike-slip faults (through-going systematic and secondary sets) at Nash Point, eastern Bristol Channel (UK) using linear elastic model and a combined Griffith-Coulomb failure criterion. It is likely that the secondary set developed from initial splay fractures associated with the shearing of the systematic or through-going set. From Bourne and Willemse (2001).

Figure 3 illustrates a similar case of sequential shearing from (a) through (c) at Valley of Fire Nevada (Flodin and Aydin, 2004) with the distinction that the strike-slip faults occur in a hierarchical pattern.

Apparent conjugate strike-slip fault system formed by sequential shearing of a set of joints or joint zones in sandstone exposed in Valley of Fire Nevada. From Flodin and Aydin (2004).Figure 3. Apparent conjugate strike-slip fault system formed by sequential shearing of a set of joints or joint zones in sandstone exposed in Valley of Fire Nevada. From Flodin and Aydin (2004).
Reference:

Bourne, S.J., Willemse, E.J.M, 2001. Elastic stress control on the pattern of tensile fracturing around a small fault network at Nash Point, UK. Journal of Structural Geology 23: 1753-1770.

Flodin, E.A., Aydin, A., 2004. Evolution of a strike-slip fault network, Valley of Fire State Park, southern Nevada. Geological Society of America Bulletin 116 (1-2): 42-59.

Rawnsley, K.D., Peacock, D.C.P., Rives, T., Petit, J.P., 1998. Joints in the Mesozoic sediments around the Bristol Channel Basin. Journal of Structure Geology 20: 1641-1661.



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