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<p>Unravelling a reliable timing of past earthquakes through luminescence dating of fault gouge depends on sufficient frictional heat during a co-seismic event to fully reset the luminescence signal. Laboratory fault-gouge production using a rotary shear apparatus has attracted interest as a method for probing the degree of signal resetting in quartz during friction experiments. However, natural fault gouges are complex, exhibiting a mixture of minerals that are specific to the host rocks. Here, we employed a host rock sample from the Alborz Mountains (Iran) and subjected it to a friction experiment without any chemical treatment, after being reset and irradiated with a known gamma dose. We performed a medium-slip velocity friction experiment with a slip velocity of 0.05 m/s and a normal stress of 12 MPa, while the temperature evolution of the gouge zone was recorded using an infrared camera. The thermographic images show a transient temperature of approximately 296 °C, with the luminescence signal resetting at a small, extremely localised slip patch, confirming the challenges involved in identifying the best spot for signal resetting. However, we identified a high-temperature signal enhancement in the thermoluminescence (TL) curves that might serve as a marker for fault-gouge formation.</p>

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Unveiling earthquakes: thermoluminescence signal resetting of a natural polymineral sample in laboratory-produced fault gouge

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月19日

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  • Maryam Heydari,
  • Sebastian Kreutzer,
  • Chien-Cheng Hung,
  • Mohammad R. Ghassemi,
  • Loïc Martin,
  • Sumiko Tsukamoto,
  • Frank Preusser,
  • André Niemeijer

摘要

Unravelling a reliable timing of past earthquakes through luminescence dating of fault gouge depends on sufficient frictional heat during a co-seismic event to fully reset the luminescence signal. Laboratory fault-gouge production using a rotary shear apparatus has attracted interest as a method for probing the degree of signal resetting in quartz during friction experiments. However, natural fault gouges are complex, exhibiting a mixture of minerals that are specific to the host rocks. Here, we employed a host rock sample from the Alborz Mountains (Iran) and subjected it to a friction experiment without any chemical treatment, after being reset and irradiated with a known gamma dose. We performed a medium-slip velocity friction experiment with a slip velocity of 0.05 m/s and a normal stress of 12 MPa, while the temperature evolution of the gouge zone was recorded using an infrared camera. The thermographic images show a transient temperature of approximately 296 °C, with the luminescence signal resetting at a small, extremely localised slip patch, confirming the challenges involved in identifying the best spot for signal resetting. However, we identified a high-temperature signal enhancement in the thermoluminescence (TL) curves that might serve as a marker for fault-gouge formation.