Friction in clay-bearing faults increases with the ionic radius of interlayer cations
Friction in clay-bearing faults increases with the ionic radius of interlayer cations
复制标题
含粘土断层中的摩擦随着层间阳离子的离子半径的增加而增加
DOI:
10.1038/s43247-022-00444-3
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发表时间:
2022
影响因子:
7.9
通讯作者:
Davatzes Nicholas C.
中科院分区:
文献类型:
--
作者:
Sakuma Hiroshi;Lockner David A.;Solum John;Davatzes Nicholas C.
Smectite can dramatically reduce the strength of crustal faults and may cause creep on natural faults without great earthquakes; however, the frictional mechanism remains unexplained. Here, our shear experiments reveal systematic increase in shear strength with the increase of the ionic radius of interlayer cations among lithium-, sodium-, potassium-, rubidium-, and cesium-montmorillonites, a smectite commonly found in faults. Using density-functional-theory calculations, we find that relatively small sodium ions fit in the ditrigonal cavities on the montmorillonite surfaces, resulting in weakening of interlayer repulsion during sliding. On the other hand, relatively large potassium ions do not fit in the ditrigonal cavities, resulting in a larger resistance to sliding due to electrostatic repulsion between potassium ions. Calculated shear strength is consistent with our shear experiments by considering the partial dehydration of the frictional contact area. These results provide the basis for developing a quantitative model of smectite-bearing fault rheology.
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DOI:
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期刊:
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DOI:
10.1029/2019jb018683
发表时间:
2020-06
期刊:
Journal of Geophysical Research: Solid Earth
影响因子:
--
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通讯作者:
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