A model for the development of crenulations in shear zones with applications from the southern appalachian piedmont
1987; Elsevier BV; Volume: 9; Issue: 7 Linguagem: Inglês
10.1016/0191-8141(87)90082-4
ISSN1873-1201
AutoresAllen J. Dennis, Donald T. Secor,
Tópico(s)Ecology and Vegetation Dynamics Studies
ResumoTwo sets of crenulations are associated with a major, Alleghanian, dextral shear zone which deformed stratigraphic and structural boundaries in the eastern Piedmont of South Carolina. Both sets of crenulation planes are oblique to the boundaries of the shear zone. The morphologies and orientations of the crenulation sets and their spatial distributions indicate that they are related to slip along foliation planes, and that they serve to compensate for displacement components of foliation slip normal to the overall movement direction in the shear zone. The crenulations act to maintain the initial thickness of the shear zone. Our evaluation of the recent literature on shear zones suggests that crenulations related to foliation slip are abundant and constitute a reliable sense of shear indicator.
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