Deformation and processes of physical evolution of sediments in 2-3 km burial depth at subduction zone

俯冲带埋深2~3 km沉积物变形及物理演化过程

• 批准号: 21740363
• 负责人: YAMAMOTO Yuzuru
• 金额: $ 2.91万
• 依托单位: Japan Agency for Marine-Earth Science and Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21740363/
• 关键词: テクトニクス; 付加体; 地震; 沈み込み帯; 粘土鉱物; メランジュ

Change in deformation styles and the related transition from smectite to illite within the aseismic-seismic transition zone (2-4 km below the seafloor) in a subduction zone were analyzed by studying an onland accretionary complex that was previously buried to a depth of just 2-4 km. Such strain hardening associated with the clay mineral transition and decrease in porosity is the primary mechanism of thickening of the decollement and/or melange zone, and represents a fundamental mechanical/chemical change in the properties of sediments immediately before entering the seismogenic zone.

通过对一个埋藏深度仅2- 4km的陆内增生杂岩的研究，分析了俯冲带地震-地震过渡带（海底以下2- 4km）内变形样式的变化以及由蒙皂石向伊利石的相关过渡。这种应变硬化与粘土矿物的过渡和孔隙度的减少是增厚的滑脱和/或混杂带的主要机制，并表示一个基本的机械/化学变化的性质的沉积物进入孕震区之前。

项目成果

Systematic development of submarine slope failures at subduction margins : fossil record of accretion-related slope failure in the Miocene Hota Accretionary Complex, Central Japan

俯冲边缘海底斜坡失稳的系统发展：日本中部中新世和田增生杂岩中与增生相关的斜坡失稳的化石记录

• 发表时间: 2012
• 期刊: Submarine Mass Movements and Their Conseauences. Advances in Natural and Technological Hazards Research Series, Springer
• 作者: Yamamoto;Y.;Yamada Y.;Yamashita;Y.;Chiyonobu. S.;Shibata;T.;Hojo;M.
• 通讯作者: M.