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首页> 外文期刊>Tectonophysics: International Journal of Geotectonics and the Geology and Physics of the Interior of the Earth >Influence of calcite decarbonation on the frictional behavior of carbonate-bearing gouge: Implications for the instability of volcanic flanks and fault slip
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Influence of calcite decarbonation on the frictional behavior of carbonate-bearing gouge: Implications for the instability of volcanic flanks and fault slip

机译：方解石脱碳对含碳酸盐凿子摩擦行为的影响：对火山岩侧面和断层滑动的不稳定性的影响

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摘要

The impact of heat, readily provided by magma, circulating hot fluids, or rapid fault slip on carbonate substrata is an important factor in determining the flank stability of volcanoes and the mechanical behavior of faults in areas where carbonate lithologies are prevalent. The mineralogy and mechanical properties of carbonate rocks are demonstrably altered by thermally induced decarbonation. While previous studies have considered the role of decarbonation in bulk strength loss at subvolcanic conditions and dynamic weakening during coseismic fault slip, little is known about the effects of decarbonation on the frictional properties of carbonate rocks during both the nucleation and inter-seismic phases. Here, we present results from experiments performed on a portlandite-rich material, a typical hydrous product of the decarbonation reaction. To evaluate frictional strength, stability, and healing at shallow crustal conditions, we sheared gouge layers of this material under saturated conditions at room temperature and at velocities comparable to those involved in earthquake nucleation. Our data indicate that the reaction of calcite to portlandite results in a distinct change in the mechanical behavior of the gouge. Decarbonated shear zones are (1) frictionally weaker at higher normal stresses, (2) more frictionally unstable, and (3) likely to regain their frictional strength more quickly than unaltered calcite-rich zones. The occurrence of portlandite could be key for interpreting the stability of volcanic flanks that root into carbonate substrata and for seismogenic normal faults located within thick sedimentary sequences, and thus provide a better understanding of the hazards they pose. (C) 2015 Elsevier B.V. All rights reserved.
机译：岩浆，循环热流体或快速断层滑动容易产生的热量对碳酸盐岩地层的影响是决定火山岩侧面稳定性和碳酸盐岩岩性普遍地区断层力学行为的重要因素。碳酸盐岩的矿物学和力学性能可以通过热诱导脱碳得到明显改变。尽管先前的研究已经考虑了脱碳在次火山条件下的整体强度损失和同震断层滑动过程中的动力减弱中的作用，但对于成核和地震间相期间脱碳对碳酸盐岩石摩擦特性的影响知之甚少。在这里，我们介绍了对富含碳酸钙的材料（脱碳反应的典型含水产物）进行的实验结果。为了评估在浅地壳条件下的摩擦强度，稳定性和愈合，我们在饱和条件下于室温和与地震成核过程相当的速度下剪切了该材料的切层。我们的数据表明，方解石与硅酸盐的反应导致了凿具机械性能的明显变化。脱碳剪切带（1）在较高的正应力下摩擦较弱，（2）摩擦较不稳定，并且（3）与未改变方解石富集区相比，恢复摩擦力的速度更快。硅酸盐的出现可能是解释生根于碳酸盐岩层的火山侧面的稳定性以及位于厚沉积序列中的地震成因正断层的关键，因此可以更好地理解它们构成的危害。 （C）2015 Elsevier B.V.保留所有权利。

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