Recognition of shear heating on a long‐lived major fault using Raman carbonaceous material thermometry: implications for strength and displacement history of the MTL, SW Japan

DOI Web Site Web Site 被引用文献14件 参考文献74件 オープンアクセス
  • Hiroshi Mori
    Department of Earth and Planetary Sciences, Graduate School of Environmental Studies Nagoya University Nagoya 464‐8601 Japan
  • Simon Wallis
    Department of Earth and Planetary Sciences, Graduate School of Environmental Studies Nagoya University Nagoya 464‐8601 Japan
  • Koichiro Fujimoto
    Faculty of Education Tokyo Gakugei University Tokyo 184‐8501 Japan
  • Norio Shigematsu
    Geological Survey of Japan National Institute of Advanced Industrial Science and Technology Tsukuba 305‐8567 Japan

書誌事項

公開日
2015-11-27
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1111/iar.12129
公開者
Wiley

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説明

<jats:title>Abstract</jats:title><jats:p>The extent to which movement on major faults causes long term shear heating is a contentious issue and an important aspect in the debate about the strength of major faults in the crust. Comparing the results of experimental work on the kinetics of crystallization of carbonaceous material with results of thermal modeling show that the Raman carbonaceous material (CM) geothermometer is well suited to studying shear heating on geological time scales in suitable lithologies exposed around exhumed major fault zones. The Median Tectonic Line (MTL), SW Japan, is the largest on‐land fault in Japan with a length of > 800 km. Application of Raman CM thermometry to pelitic schist adjacent to the fault reveals the presence of a rise in peak temperature of around 60 °C over a distance of around 150 m perpendicular to the MTL fault plane. The spatial association of this thermal anomaly with the fault implies it is due to shear heating. Thermal modeling shows the recorded thermal anomaly and steep temperature gradient is compatible with very high rates of displacement over time scales of a few thousand years. However, the implied displacement rates lie outside those generally observed. An alternative explanation is that an originally broader thermal anomaly that developed during strike slip faulting was shortened due to the effects of normal faulting. Constraints on displacement rate, width of the original anomaly, duration of heating and peak temperature imply a coefficient of friction, <jats:italic>μ</jats:italic>, greater than 0.4.</jats:p>

収録刊行物

  • Island Arc

    Island Arc 24 (4), 425-446, 2015-11-27

    Wiley

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