The structural states of carbon material (CM) in samples of initially sedimentary marble and shale subjected to carbonization in fault zones and adjacent near-fault areas were studied by Raman spectroscopy. The sequence of irreversible transformations of the CM structure from the initial amorphous state through turbostratic forms to hexagonal graphite mostly localized in shear zones was revealed. With account for the experimental results on simulation of the processes of carbonate carbonization upon its thermomechanical decomposition under the conditions of high-speed shear, it was concluded that the factor of the state of the carbon structure may be used as a diagnostic characteristic of seismogenic faults.

中文翻译：

---

碳酸盐岩和硅酸盐岩发震断层带 sp2 碳的结构变化

通过拉曼光谱研究了在断裂带和邻近的近断层区进行碳化的初始沉积大理岩和页岩样品中碳材料（CM）的结构状态。揭示了 CM 结构从初始无定形状态到乱层形式到主要位于剪切带中的六方石墨的不可逆转变序列。结合高速剪切条件下碳酸盐热机械分解碳化过程的模拟实验结果，得出碳结构状态的因素可以作为地震断层的诊断特征。 .