Vitrinite reflectance and Raman spectra of carbonaceous material as indicators of frictional heating on faults: Constraints from friction experiments

摘要: Abstract Vitrinite reflectance (R o ) and Raman spectra of carbonaceous material (RSCM) are both widely used as indicators the maximum attained temperatures in sedimentary metamorphic rocks. However, potential these methods to estimate temperature increases associated with fault slip has not been closely studied. To examine this issue, friction experiments were conducted on a mixture powdered clay-rich (CM) at rates 0.15 mm/s 1.3 m/s nitrogen (N 2 gas or without distilled water. After experiments, we measured R RSCM compared those starting material. The results indicate that when suffers rapid heating >500 °C ∼9 s m/s, intensity ratio D1 D2 bands CM (I /I markedly increase. Comminution very small rise ∼32 min is responsible for limited changes I . Our demonstrate could be useful detection frictional faults power density ≥0.52 MW/m conventionally geothermometers inadequate estimation peak during seismic slip. reaction kinetics incorporating effects high studies original microtexture composition required establish reliable thermometer faults.