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 ~ 120 m. In a 10 cm 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.
| Original language | English |
|---|---|
| Pages (from-to) | 107-116 |
| Number of pages | 10 |
| Journal | Tectonophysics |
| Volume | 723 |
| DOIs | |
| Publication status | Published - 2018 Jan 16 |
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Keywords
- Fabric transition
- Frictional heating
- Garam thrust
- Lattice preferred orientation
- Seismic slip
ASJC Scopus subject areas
- Geophysics
- Earth-Surface Processes
Cite this
Fabric transition with dislocation creep of a carbonate fault zone in the brittle regime. / Kim, Sungshil; Lee, Jin-Han; Han, Raehee; Kim, Nahyeon; Jung, Haemyeong.
In: Tectonophysics, Vol. 723, 16.01.2018, p. 107-116.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Fabric transition with dislocation creep of a carbonate fault zone in the brittle regime
AU - Kim, Sungshil
AU - Lee, Jin-Han
AU - Han, Raehee
AU - Kim, Nahyeon
AU - Jung, Haemyeong
PY - 2018/1/16
Y1 - 2018/1/16
N2 - 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 ~ 120 m. In a 10 cm 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.
AB - 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 ~ 120 m. In a 10 cm 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.
KW - Fabric transition
KW - Frictional heating
KW - Garam thrust
KW - Lattice preferred orientation
KW - Seismic slip
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U2 - 10.1016/j.tecto.2017.12.008
DO - 10.1016/j.tecto.2017.12.008
M3 - Article
VL - 723
SP - 107
EP - 116
JO - Tectonophysics
JF - Tectonophysics
SN - 0040-1951
ER -