Mechanochemical Effect on Maturation of Carbonaceous Material: Implications for Thermal Maturity as a Proxy for Temperature in Estimation of Coseismic Slip Parameters
Mechanochemical Effect on Maturation of Carbonaceous Material: Implications for Thermal Maturity as a Proxy for Temperature in Estimation of Coseismic Slip Parameters
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DOI：
10.1002/2017gl076791
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发表时间：
2018-03
影响因子：
5.2
通讯作者：
S. Kaneki;T. Ichiba;T. Hirono
中科院分区：
文献类型：
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作者：
S. Kaneki;T. Ichiba;T. Hirono
由于断层中的剪切应力与滑动过程中产生的摩擦热直接相关，因此碳质物质的热成熟度已被用作断层-岩石温度的代表。我们使用红外和拉曼光谱分析以及摩擦和加热实验来研究剪切损伤（机械化学效应）对褐煤成熟的促进作用，并探讨了使用褐煤热成熟度作为温度代表的结果含义。我们发现，对褐煤样品施加较高的剪切应力会导致脂肪族C─H链的热破坏进程加快，而较强的C─C键则会存活下来。因此，我们证明了地震滑动时的剪切损伤导致与褐煤芳构化相关的有机化学反应的机械化学增强。我们的研究结果表明，在以前的研究中，拉曼光谱分析估计的剪切应力可能被高估了。
Because shear stress in a fault is directly related to the frictional heat generated during slip, the thermal maturity of carbonaceous material has been used as a proxy for fault‐rock temperature. We used infrared and Raman spectroscopic analyses and friction and heating experiments to investigate enhancement of the maturation of lignite by shear damage (the mechanochemical effect) and explored the resultant implications for the use of the thermal maturity of lignite as a proxy for temperature. We showed that higher shear stress applied to lignite samples resulted in greater progression of the thermal destruction of aliphatic C─H chains and the survival of the stronger C─C bonds. Thus, we demonstrated that shear damage during earthquake slip causes mechanochemical enhancement of organochemical reactions related to the aromatization of lignite. Our results suggest that shear stress estimated from Raman spectroscopic analyses in previous studies might have been overestimated.