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Abstract
The role of calcite-rich metasedimentary mylonites in localizing detachment fault strain and influencing the structural evolution of the Buckskin-Rawhide metamorphic core complex, west-central Arizona
Highlights
Weak zones may play a critical role in controlling the location, geometry, and style of deformation in any tectonic setting
Based on the distribution and interpreted age of Paleozoic metasedimentary rocks in the footwall of the Buckskin detachment fault, we propose that a related Mesozoic thrust system was responsible for burial of the metasedimentary rocks to mid-crustal depths
A thinner package of calc-mylonites is most likely present along the entire northwest flank of the Planet Peak corrugation (Fig. 7). We interpret these metasedimentary rocks to have been derived from Paleozoic strata that were buried beneath crystalline rocks to mid-crustal depths along southeast-vergent Cretaceous thrust faults, similar to relationships exposed in structurally higher thrusts in the region (e.g., Reynolds and Spencer, 1989)
Summary
Weak zones may play a critical role in controlling the location, geometry, and style of deformation in any tectonic setting. Extensional detachment faults and associated footwall shear zones are commonly associated with metasedimentary rocks. Detachment fault systems in Cordilleran metamorphic core complexes affect all types of rocks, but several are localized in rheologically weak metasedimentary units. Shear zones associated with these Cenozoic detachment fault systems utilized rheological boundaries and weak zones within these metasedimentary rocks. The shear zone in the northern Ruby Mountains–East Humbolt Range (Nevada) developed in the carbonate-rich Neoproterozoic–Paleozoic section (Snoke, 1980), attenuating strata to ~5% of original thickness (Snoke and Howard, 1984). Much of the shear associated with the Miocene detachment fault system in the Funeral Mountains (Death Valley, California) appears to have been accommodated in a ≤10-m-thick calcite marble mylonite zone derived from Neoproterozoic strata (Hoisch and Simpson, 1993; Beyene, 2011).
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