Formation of clast-cortex aggregates in experimental fault gouges
Formation of clast-cortex aggregates in experimental fault gouges
复制标题
实验断层泥中碎屑皮层聚集体的形成
DOI：
10.1016/j.tecto.2022.229524
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发表时间：
2022
期刊：
影响因子：
2.9
通讯作者：
Oohashi Kiyokazu
中科院分区：
文献类型：
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作者：
Kim Jae Hoon;Ree Jin-Han;Hirose Takehiro;Oohashi Kiyokazu
碎屑-皮层集合体（CCAs）在实验和天然断层泥中已被广泛报道。在这里，我们讨论的形成过程中的CCA及其机械影响，实验模拟断层泥的基础上。我们对钙基膨润土泥进行了低速到高速旋转剪切实验，法向应力为1 MPa，滑动速率为0.01-1.31 m s-1，环境温度和湿度条件。CCA由中心碎屑（主要是石英碎片与次要粘土聚集体）和纳米粘土颗粒的同心边缘（即，皮质）。CCA的尺寸范围从1到100 μm，并在所有滑动速率下邻近于片理化高应变层发展。显微结构表明，CCA富集层主要变形的粒状流，而片理化高应变层的变形的碎裂流。随着位移的增加，CCA的平均尺寸增加，并形成同心圆，这表明CCA像滚雪球一样增长。从CCA和应变标记的同心层获得的估计应变率表明存在一系列有利于颗粒流和CCA的形成和生长的剪切应变率。
Clast–cortex aggregates (CCAs) have been commonly reported in experimental and natural fault gouges. Here we discuss the formation process of CCAs and its mechanical implications, based on experimentally simulated fault gouges. We conducted low- to high-velocity rotary shear experiments on Ca-bentonite gouges at a normal stress of 1 MPa, slip rates of 0.01–1.31 m s−1, and ambient temperature and humidity conditions. The CCAs consist of a central clast (mostly quartz fragments with subordinate clay aggregates) and a concentric rim of nano-clay particles (i.e., cortex). The CCAs range in size from 1 to 100 μm and developed adjacent to a foliated high-strain layer at all slip rates. The microstructures suggest that the CCA-rich layer was mainly deformed by granular flow, whereas the foliated high-strain layer was deformed by cataclastic flow. The increase in average size of the CCAs with displacement and the formation of their concentric rims suggest that the CCAs grew like a rolling snowball. The estimated strain rates obtained from the concentric layers of the CCAs and strain markers indicate the existence of a range of shear strain rates that favors granular flow and the formation and growth of CCAs.
高速断层滑动过程中及滑动后滑动速度和温度对渗透率影响的实验研究
影响因子：
3.1
作者：
W. Tanikawa;H. Mukoyoshi;O. Tadai
通讯作者：
O. Tadai
利用断层泥石英光释光信号测定上次地震事件的实验研究
影响因子：
2.9
作者：
Kim Jae Hoon;Ree Jin-Han;Choi Jeong-Heon;Chauhan Naveen;Hirose Takehiro;Kitamura Manami
通讯作者：
Kitamura Manami
2008，粘土碎屑聚集体：地震断层滑动的新结构证据？
DOI：
--
发表时间：
2008
期刊：
Geophys. Res. Lett 35
影响因子：
--
作者：
Boutareaud;S.;Calugaru;D.;Han;R.;Fabbri;O.;Mizoguchi;Tsutsumi;A.;Shimamoto;T
通讯作者：
T