Multidisciplinary study on generation process of slickenside

• Project/Area Number: 16H04063
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Geology
• Research Institution: Hiroshima University
• Principal Investigator: ANDO Jun-ichi 広島大学, 理学研究科, 教授 (50291480)
• Co-Investigator(Kenkyū-buntansha): 富岡 尚敬 国立研究開発法人海洋研究開発機構, 高知コア研究所, 主任技術研究員 (30335418) ; 廣瀬 丈洋 国立研究開発法人海洋研究開発機構, 高知コア研究所, グループリーダー (40470124) ; 鍵 裕之 東京大学, 大学院理学系研究科(理学部), 教授 (70233666) ; 大藤 弘明 愛媛大学, 地球深部ダイナミクス研究センター, 教授 (80403864)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥18,330,000 (Direct Cost: ¥14,100,000、Indirect Cost: ¥4,230,000); Fiscal Year 2018: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000); Fiscal Year 2017: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2016: ¥11,180,000 (Direct Cost: ¥8,600,000、Indirect Cost: ¥2,580,000)
• Keywords: 鏡肌 / 断層岩 / 形成過程 / 微細組織 / ナノ粒子 / 高速回転摩擦試験機 / 二軸摩擦実験 / 摩擦係数 / 断層運動 / 力学特性 / 岩石・鉱物・鉱床学 / 地殻・マントル物質 / 地質学 / 地震 / 超薄膜 / 地殻マントル物質

Outline of Final Research Achievements

Slickenside is a glossy and smoothly surface developed on the fault slip plane. Although the slickenside is a common and well-known microstructure, its microstructural characterization and effect on the fault behaviour have not been fully studied, so far. To understand these issues, we studied the microstructures of natural samples including nine different rock species, and conducted the frictional experiments using limestone and gabbro samples. The recovery samples from the experiments were also studied for their microstructural characterization. One of the most important results is that the slickenside is caused by deformation concentration on the top surface of the fault within 50-100um thickness during faulting. And the other, considered from the frictional experiments using limestone is that the fault having slickenside probably reduces the chance of large earthquake, and instead augments the generation of smaller creep-related seismic activities.

Academic Significance and Societal Importance of the Research Achievements

断層面に形成される鏡肌の成因を知ることは、地下に存在する多くの断層運動の発生過程や、断層運動のすべり特性を理解することにつながる。地震を発生させる断層は地下に存在するため、その実態を岩石の変形特性を通して研究することはなかなか難しい。本研究では、もともと地下に存在し、その後地表に現れた断層を対象に微細組織の観点から主に研究を行った。その結果、得られた鏡肌の成因等の解明は学術的な意義の高いものである。また断層運動や地震活動の研究につながる本研究は社会的意義も十分にある。

Research Products

• [Journal Article] The architecture of long-lived fault zones: insights from microstructure and quartz lattice-preferred orientations in mylonites of the Median Tectonic Line, SW Japan (2019)
  • Author(s): Czertowicz Thomas A.、Takeshita Toru、Arai Shun、Yamamoto Takafumi、Ando Jun-Ichi、Shigematsu Norio、Fujimoto Ko-Ichiro
  • Journal Title: Progress in Earth and Planetary Science Volume: 6 Issue: 1 Pages: 1-20
  • DOI: 10.1186/s40645-019-0261-6
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Coalescing microstructure and fabric transitions with AMS data in deformed limestone: Implications on deformation kinematics (2018)
  • Author(s): Ghosh Bhaskar、Das Paramita、Sarkar Dyuti Prakash、Ghosh Gautam、Mukhopadhyay Joydip、Ando Jun-ichi
  • Journal Title: Journal of Structural Geology Volume: 114 Pages: 294-309
  • DOI: 10.1016/j.jsg.2017.12.016
  • Peer Reviewed
• [Journal Article] The occurrence of fluor-wagnerite in UHT granulites and its implications towards understanding fluid regimes in the evolution of deep crust: a case study from the Eastern Ghats Belt, India (2017)
  • Author(s): K. Das, N. Tomioka, S. Bose, J. Ando, I. Ohnishi
  • Journal Title: Mineralogy and Petrology Volume: 111 Issue: 3 Pages: 417-429
  • DOI: 10.1007/s00710-016-0474-y
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Deformation history of Pinatubo peridotite xenolith: constraint from microstructural observation and determination of olivine slip system (2017)
  • Author(s): Yamamoto, T., Ando, J., Tomioka, N., and Kobayashi, T.
  • Journal Title: Physics and Chemistry of Minerals Volume: 44 Issue: 4 Pages: 247-262
  • DOI: 10.1007/s00269-016-0853-2
  • Peer Reviewed
• [Journal Article] Microstructural observations of fracture–filling goethite vein along the Kerajang Fault Zone in the Rengali Province of eastern India (2017)
  • Author(s): T. Yamamoto, J. Ando, N. Tomioka, K. Das, G. Ghosh, S. Bose
  • Journal Title: Journal of Mineralogical and Petrological Sciences Volume: 112 Issue: 2 Pages: 102-107
  • DOI: 10.2465/jmps.161113
  • NAID: 130007348405
  • ISSN: 1345-6296, 1349-3825
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Frictional strength of ground dolerite gouge at a wide range of slip rates (2016)
  • Author(s): Wada, J., Kanagawa, K., Kitajima, H., Takahashi, M., Inoue, A., Hirose, T., Ando, J. and Noda, H.
  • Journal Title: Journal of Geophysical Research Volume: 121 Issue: 4 Pages: 2961-2979
  • DOI: 10.1002/2015jb012013
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] 鏡肌の微細組織の特徴とその形成過程 (2018)
  • Author(s): 長岡昂吉・安東淳一・廣瀬丈洋・鍵裕之・大藤弘明
  • Organizer: 日本鉱物科学会
• [Presentation] 鏡肌を構成する物質の特徴 (2018)
  • Author(s): 安東淳一・長岡昂吉・富岡尚敬・鍵裕之
  • Organizer: 日本地質学会
• [Presentation] 鏡肌の摩擦特性 (2017)
  • Author(s): 安東淳一
  • Organizer: 鉱物科学会
• [Presentation] 鏡肌の微細組織観察と再現実験から考える形成過程 (2017)
  • Author(s): 長岡昂吉、安東淳一他
  • Organizer: 鉱物科学会
• [Presentation] 鏡肌の形成過程 (2016)
  • Author(s): 安東淳一
  • Organizer: 鉱物科学会