Fabric transition with dislocation creep of a carbonate fault zone in the brittle regime

Fabric transition with dislocation creep of a carbonate fault zone in the brittle regime Fabric transition by a switch in the dominant slip system of minerals in the plastic regime can be induced by changes in temperature, strain rate, or water content. We propose here this fabric transition by frictional heating in seismogenic fault zones in the brittle regime. The Garam Thrust in the Taebaeksan Basin of South Korea has a hanging wall of Cambrian dolostone juxtaposed against a footwall of Ordovician limestone and records a minimum displacement of ~120m. In a 10cm thick plastically deformed layer adjacent to the principal slip layer of the fault zone, the lattice preferred orientation of calcite grains suggests that the dominant slip system changes, approaching the principal slip layer, from r ⟨02–21⟩ and e-twinning, through r ⟨02–21⟩ and basal ⟨a⟩, to basal ⟨a⟩. This fabric transition requires a high temperature-gradient of 40°C/cm, which we infer to result from frictional heating of the seismic fault zone. We suggest that fabric transition within a thin plastically deformed layer adjacent to the principal slip layer of a fault zone indicates an unusually steep temperature gradient and provides strong evidence of seismic slip. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Tectonophysics Elsevier

Fabric transition with dislocation creep of a carbonate fault zone in the brittle regime

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Publisher
Elsevier
Copyright
Copyright © 2017 Elsevier B.V.
ISSN
0040-1951
eISSN
1879-3266
D.O.I.
10.1016/j.tecto.2017.12.008
Publisher site
See Article on Publisher Site

Abstract

Fabric transition by a switch in the dominant slip system of minerals in the plastic regime can be induced by changes in temperature, strain rate, or water content. We propose here this fabric transition by frictional heating in seismogenic fault zones in the brittle regime. The Garam Thrust in the Taebaeksan Basin of South Korea has a hanging wall of Cambrian dolostone juxtaposed against a footwall of Ordovician limestone and records a minimum displacement of ~120m. In a 10cm thick plastically deformed layer adjacent to the principal slip layer of the fault zone, the lattice preferred orientation of calcite grains suggests that the dominant slip system changes, approaching the principal slip layer, from r ⟨02–21⟩ and e-twinning, through r ⟨02–21⟩ and basal ⟨a⟩, to basal ⟨a⟩. This fabric transition requires a high temperature-gradient of 40°C/cm, which we infer to result from frictional heating of the seismic fault zone. We suggest that fabric transition within a thin plastically deformed layer adjacent to the principal slip layer of a fault zone indicates an unusually steep temperature gradient and provides strong evidence of seismic slip.

Journal

TectonophysicsElsevier

Published: Jan 16, 2018

References

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