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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Effect of phyllosilicates on fluid-assisted healing of gouge-bearing faults
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Effect of phyllosilicates on fluid-assisted healing of gouge-bearing faults

机译：页硅酸盐对含泥断层流体辅助愈合的影响

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On the basis of both experimental and field studies, it is widely accepted that solution transfer processes are important in controlling fault strength recovery (healing) in the hydrothermal reaches of the seismogenic zone. Fluid-assisted healing of fault gouge may be strongly influenced by phyllosilicate content and spatial arrangement, but little is known about such effects. To study these effects, we have performed slide-hold-slide experiments using simulated faults containing gouges of halite+kaolinite saturated with brine. In this system, solution transfer processes are extremely fast. The results show rapid healing in the case of pure halite gouge, whereas almost no such effects were observed in foliated, clay-bearing gouge under otherwise identical conditions. The degree of healing increased with increasing shear strain in monomineralic gouge, whereas the opposite was observed in clay-bearing gouge. The above effects are interpreted to be due to phyllosilicates inhibiting halite-halite grain contact healing processes, an effect which becomes more prominent as on-going shear deformation leads to foliation development. The results raise questions regarding recent application of laboratory-derived healing data for monomineralic gouge to natural fault rocks, since these generally contain significant amounts of phyllosilicates and are often foliated.
机译：在实验和现场研究的基础上，众所周知，溶液传输过程对于控制地震成因区热液段的断层强度恢复（修复）很重要。层状硅酸盐含量和空间排列可能强烈影响断层泥的流体辅助愈合，但对这种影响知之甚少。为了研究这些影响，我们使用模拟断层进行了滑动-保持-滑动实验，该断层包含充满盐水的岩盐+高岭石的切屑。在此系统中，解决方案传输过程非常快。结果表明，在纯石盐凿子的情况下，其快速愈合，而在其他条件相同的情况下，在叶状，含粘土的凿子中几乎没有观察到这种作用。在单矿物凿子中，愈合程度随剪切应变的增加而增加，而在含粘土凿子中则相反。认为上述作用是由于页硅酸盐抑制了卤石与卤石的颗粒接触愈合过程，这种作用随着正在进行的剪切变形导致叶片形成而变得更加突出。这些结果引起了人们对单矿物凿的实验室修复数据最近应用于天然断层岩的质疑，因为这些岩层通常含有大量的页硅酸盐，而且通常是叶状的。

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