Abstract
The Marietta-Tyron graben is a system of 21 brittle faults, cataclastic zones, and lineaments in the Piedmont of South Carolina and adjacent North Carolina, developed as part of a broad zone of crustal deformation during Mesozoic continental rifting. Sinistral normal-oblique movements dominate the N50°-70°E fault system; dextral normal-oblique movements, possibly younger, also occur along three ENE-trending faults. Recurrent, incongruous movements are suggested by scatter in regional slickenline data; nonetheless, the mean vector orientations for slickenlines from each fault zone are remarkably consistent, produced by a strong strike-slip component of oblique slip. A complex Mesozoic brittle history superimposed on Paleozoic folding, metamorphism, magmatism, and jointing is recorded also in the multiple shearing and quartz veinfilling textures of fault-related, siliceous cataclastic rocks.
Locally, Late Triassic-Early Jurassic(?) diabase (dolerite) dikes are sinistrally strike-separated several hundred meters across brittle faults. Positioning and steep attitudes of the faults likely are structurally inherited from a northeasterly regional joint set.
Conjugate zeolite/epidote-coated brittle shears in bedrock gneiss and drusy quartz extension fractures in cataclastic rocks indicate that dilational opening, oblique (<90°) to the N60°E fault trend, operated during at least the later stages of development of the graben. Regional extension oriented S35°-45°E may be responsible for the sinistral normal-oblique longitudinal shearing experienced by all faults and many nearby joints of the system.
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Garihan, J.M., Ranson, W.A. (1992). Structure of the Mesozoic Marietta-Tryon graben, South Carolina and adjacent North Carolina. In: Bartholomew, M.J., Hyndman, D.W., Mogk, D.W., Mason, R. (eds) Basement Tectonics 8. Proceedings of the International Conferences on Basement Tectonics, vol 2. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1614-5_36
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DOI: https://doi.org/10.1007/978-94-011-1614-5_36
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