Data obtained on carbonates and metaterrigenous rocks of the Devonian complex of the Sultan-Uizdag Range, northwestern Uzbekistan, which are carbonized in local deformation zones, are used in a generalized interpretation of the genesis of carbonaceous matter by means of decomposition of carbonates under the effect of seismogenic movements. The release of free carbon is facilitated by synchronous Fe–Mg metasomatism and by the reducing conditions in the presence of hydrogen. Based on literature data on experimental modeling of carbonization processes at high-speed shear deformations of carbonates in a hydrogen medium, a possible scenario is considered for the generation of hydrogen on the surfaces of quartz dislocations in the presence of water in metaterrigenous rocks in association with carbonates. The variation of carbon isotope composition over the volume of the carbonate and terrigenous rocks is extremely heterogeneous, with the 13C isotope enriched in the fracture zones and 12C enriched in the near-fracture volumes of decompression-damaged rocks. It is hypothesized that deformations can affect the fractionation of stable carbon isotopes. With regard for literature data, it is demonstrated that isotope exchange can proceed between the free carbon and carbonate carbon. Various aspects are discussed of the influence of mineral-phase and structural–textural transformations of carbonate rocks at their thermomechanical decomposition under shearing on the geomechanical behavior of the fracture, manifestations of mechanical instability in it, and causes of frictional weakening.

中文翻译：

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动态滑移区碳酸盐的碳化和稳定碳同位素的分馏

乌兹别克斯坦西北部 Sultan-Uizdag 山脉泥盆纪复合体碳酸盐岩和准陆源岩在局部变形带碳化的数据，用于通过碳酸盐作用下碳酸盐分解作用对碳质物质成因的广义解释的地震运动。同步的 Fe-Mg 交代作用和氢存在下的还原条件促进了游离碳的释放。基于在氢介质中碳酸盐高速剪切变形下碳化过程的实验模拟的文献数据，考虑了在准陆源岩石中存在水的情况下在石英位错表面产生氢的可能情况。碳酸盐。碳同位素组成在碳酸盐岩和陆源岩石体积上的变化非常不均匀，13C 同位素在断裂带中富集，12C 在减压破坏岩石的近断裂体积中富集。据推测，变形会影响稳定碳同位素的分馏。关于文献数据，表明同位素交换可以在游离碳和碳酸盐碳之间进行。讨论了碳酸盐岩在剪切下的热机械分解时的矿物相和结构 - 结构转变对裂缝地质力学行为的影响，其中机械不稳定性的表现以及摩擦减弱的原因。