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Yang Zhou, Bichuan Cai, Rongwei Zhu, Lin Wang, Weijie Zhang, Junzhi Liu, Yongjian Yao, Shengchang Ding, Hailing Liu, Yonglei Zhang, Wei Liu, Qingsong Liu, Yiwen Ju. Nanoscale Textural and Evolution of the Carbonate Fault Mirrors: Implication for Fault Lubrication during the 2014 Ludian Earthquakes, China. Journal of Earth Science. doi: 10.1007/s12583-025-0231-4
Citation: Yang Zhou, Bichuan Cai, Rongwei Zhu, Lin Wang, Weijie Zhang, Junzhi Liu, Yongjian Yao, Shengchang Ding, Hailing Liu, Yonglei Zhang, Wei Liu, Qingsong Liu, Yiwen Ju. Nanoscale Textural and Evolution of the Carbonate Fault Mirrors: Implication for Fault Lubrication during the 2014 Ludian Earthquakes, China. Journal of Earth Science. doi: 10.1007/s12583-025-0231-4

Nanoscale Textural and Evolution of the Carbonate Fault Mirrors: Implication for Fault Lubrication during the 2014 Ludian Earthquakes, China

doi: 10.1007/s12583-025-0231-4
Funds:

Science and Technology Program of Guangzhou,China (2023A04J0238).

92158208

This research was financially supported by National Natural Science Foundation of China (Grant Nos. 42406062

41776072)

  • Available Online: 25 Mar 2025
  • To study the dynamic weakening processes, we conducted micro to nano scale structures and mineral composition analysis of natural carbonate fault mirrors (FMs) from the Mw 6.2 Ludian earthquake. Several 2-5 μm wide micro-slip surfaces are quickly localized to cut the previously formed shear band (<20 μm) based on microstructural observations. The R1-Riedel shears and tension fracture occurred outside the micro-slip surfaces (2-5 μm) boundaries in the low-strain domain. The strain is distributed across the initial thin shear band. In the slide process, the calcite twins experienced mechanical milling, producing wear particles with much reduced grain size. These nanoparticles are considered as the triggering ingredient for fault lubrication. Followed by the rise of temperature recorded by the magnetic minerals, the nanoparticles are welded to nano-aggregates due to frictional heating over 700 °C and accompanied by the decarbonization. We suggest that the calcite aggregates and CO2 degassing may be an important precursor for friction reduction in carbonate fault during the earthquake.

     

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      沈阳化工大学材料科学与工程学院 沈阳 110142

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