Initiating Salt Tectonics by Tilting: Viscous Coupling Between a Tilted Salt Layer and Overlying Brittle Sediment.
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F21%3A00544588" target="_blank" >RIV/67985858:_____/21:00544588 - isvavai.cz</a>
Výsledek na webu
<a href="http://hdl.handle.net/11104/0321429" target="_blank" >http://hdl.handle.net/11104/0321429</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1029/2020JB021503" target="_blank" >10.1029/2020JB021503</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Initiating Salt Tectonics by Tilting: Viscous Coupling Between a Tilted Salt Layer and Overlying Brittle Sediment.
Popis výsledku v původním jazyce
Salt basins often exhibit a shelf/slope region of extension and a deeper domain of contraction. The up-slope normal faults in such salt tectonics systems are often associated with the pinch-out edge of the buried salt layer. Although the spatial correlation between the normal faults and the salt pinch-out was previously observed, the mechanism was not fully explained. The Levant basin, which is a young and mildly deformed salt basin with a relatively thin overburden, provides an opportunity to analyze a simple salt tectonics system driven by basin margin tilt, and the formation of the normal faults. This work presents analytical and numerical modeling of the coupled viscous salt and overlying visco-plastic sediment layer. Results suggest the viscosities of both the sediment overburden and salt, as well as their thicknesses, control the deformation of the coupled layers. The visco-plastic deformation mechanism explains quantitatively the position of faulting and observations of the temporal evolution of brittle deformation in the Levant basin margin. It predicts that the largest stress in the overburden arises above the salt edge, driving normal faulting at that location. Our model also places quantitative constraints on the effective viscosity of the overburden (>2 × 1020 Pa s), which is consistent with experimentally-determined creep laws. Our results contribute to the understanding of halokinematics in salt basins during the early stages of deformation and will allow better assessment of geological hazards related to salt related deformation.
Název v anglickém jazyce
Initiating Salt Tectonics by Tilting: Viscous Coupling Between a Tilted Salt Layer and Overlying Brittle Sediment.
Popis výsledku anglicky
Salt basins often exhibit a shelf/slope region of extension and a deeper domain of contraction. The up-slope normal faults in such salt tectonics systems are often associated with the pinch-out edge of the buried salt layer. Although the spatial correlation between the normal faults and the salt pinch-out was previously observed, the mechanism was not fully explained. The Levant basin, which is a young and mildly deformed salt basin with a relatively thin overburden, provides an opportunity to analyze a simple salt tectonics system driven by basin margin tilt, and the formation of the normal faults. This work presents analytical and numerical modeling of the coupled viscous salt and overlying visco-plastic sediment layer. Results suggest the viscosities of both the sediment overburden and salt, as well as their thicknesses, control the deformation of the coupled layers. The visco-plastic deformation mechanism explains quantitatively the position of faulting and observations of the temporal evolution of brittle deformation in the Levant basin margin. It predicts that the largest stress in the overburden arises above the salt edge, driving normal faulting at that location. Our model also places quantitative constraints on the effective viscosity of the overburden (>2 × 1020 Pa s), which is consistent with experimentally-determined creep laws. Our results contribute to the understanding of halokinematics in salt basins during the early stages of deformation and will allow better assessment of geological hazards related to salt related deformation.
Klasifikace
Druh
J<sub>imp</sub> - Článek v periodiku v databázi Web of Science
CEP obor
—
OECD FORD obor
10505 - Geology
Návaznosti výsledku
Projekt
<a href="/cs/project/GJ19-21114Y" target="_blank" >GJ19-21114Y: Mechanická teorie dynamicky aktivovaných zemětřesení</a><br>
Návaznosti
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Ostatní
Rok uplatnění
2021
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
Journal of Geophysical Research-Solid Earth
ISSN
2169-9313
e-ISSN
2169-9356
Svazek periodika
126
Číslo periodika v rámci svazku
7
Stát vydavatele periodika
US - Spojené státy americké
Počet stran výsledku
31
Strana od-do
e2020JB021503
Kód UT WoS článku
000678880700058
EID výsledku v databázi Scopus
2-s2.0-85111492391