Experimental research on rheology and seismic wave velocity properties of partially molten lower crustal rocks

部分熔融下地壳岩石流变及地震波速特性实验研究

• 批准号: 22740328
• 负责人: MUTO Jun
• 金额: $ 2.66万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22740328/
• 关键词: 下部地殻; レオロジー; 部分溶融; 岩石変形; 地震波速度; メルト; 斜長石; 地殻流体; 岩石変形実験; 固体圧変形試験機; 地殻のレオロジー; 弾性波速度; Griggs試験機; 地震発生; 格子定向配列; テクトニクス

In order to estimate the effect of melt and water on the rheological behavior of the lower crust, high pressure and temperature deformation experiments were conducted using Griggs type solid medium apparatus. Increases in the melt content decreases flow strengths under the presence of water. The flow stress decreases with increasing the water content added to the sample and decreasing strain rate. This indicates that the flow strength of anorthite aggregates is determined by the amount of water contents introduced into the aggregate. The water content required to cause weakening was consistent with the lower bound of water contents in the lower crust estimated by geophysical observations. The water contents left in the weakened samples measured after deformation experiments are consistent with naturally deformed feldspars. This indicates that the amount of water in the lower crust controls the rheological behavior of lower crustal rocks.

为了评价熔体和水对下地壳流变行为的影响，利用Griggs型固体介质装置进行了高压和高温变形实验。熔体含量的增加降低了在水存在下的流动强度。流变应力随试样含水量的增加和应变速率的降低而降低。 这表明钙长石骨料的流动强度取决于引入骨料中的水含量。造成弱化所需的含水量与地球物理观测估计的下地壳含水量下限一致。变形实验后测得的弱化样品中残留的含水量与自然变形的长石一致。这表明下地壳中的水量控制着下地壳岩石的流变行为。

项目成果

Pulverization of quartz single crystal and natural quartzite induced by possible super-shear rupture during stick-slips

粘滑过程中可能的超剪切破裂导致石英单晶和天然石英岩的粉碎

• 发表时间: 2011
• 作者: O.Nishikawa ;J.Muto ;K.Otsuki
• 通讯作者: K.Otsuki

人工アノーサイト多結晶体中の水の不均質分布と歪の局所化

人造钙长石多晶中水的不均匀分布和应变局部化

• 作者: 福田惇一;武藤潤;長濱裕幸
• 通讯作者: 長濱裕幸

東北日本島弧-海溝系の不均質粘弾性モデルの構築

日本东北岛弧-海沟系统非均质粘弹性模型的构建

• 发表时间: 2014
• 作者: M. Engebretson;J. Posch;J. Wygant;C. Kletzing;M. Lessard;C. Huang;H. Spence;C. Smith;H. Singer;Y. Omura;R. Horne;G. Reeves;D. Baker;M. Gkioulidou;K. Oksavik;I. Mann;T. Raita;K. Shiokawa;武藤潤・芝崎文一郎・飯沼卓史
• 通讯作者: 武藤潤・芝崎文一郎・飯沼卓史

Fabric evolution of single crystals of synthetic quartz sheared at low temperature.

低温剪切合成石英单晶的织物演化。

• 作者: Kaneko;H.;Muto;J.;Nagahama;H.
• 通讯作者: H.

岩石のレオロジーから見る東北日本弧の変形

从岩石流变学看日本东北弧形变

• 发表时间: 2011
• 作者: Hirose T.;Kawagucci S.;Suzuki K;武藤潤
• 通讯作者: 武藤潤