Reconstructing the evolution of fault zone architecture: Field‐based study of the core region of the Atera Fault, Central Japan
Reconstructing the evolution of fault zone architecture: Field‐based study of the core region of the Atera Fault, Central Japan
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重建断层带结构的演化：日本中部阿泰拉断层核心区域的实地研究
DOI：
10.1111/j.1440-1738.2009.00674.x
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发表时间：
2009
期刊：
影响因子：
1.5
通讯作者：
A. Tanase
中科院分区：
文献类型：
--
作者：
M. Niwa;Y. Mizuochi;A. Tanase
为了重建非均质构造断裂带的构造演化，以日本中部阿特拉断裂带为研究对象，详细描述了该断裂带的细观和微观特征。研究的断裂带由一个1.2 m宽的断角砾岩断层核组成，其中混合了来自焊接凝灰岩、花岗岩和基性火山岩的碎片。1.2 m宽的断层核与西部以焊接凝灰岩断裂角砾岩为特征的破坏带和东部以花岗岩碎裂岩为特征的破坏带接壤。次级断层核，一个30厘米宽的花岗岩衍生断层泥，横切花岗岩碎裂岩。焊接凝灰岩断层角砾岩和花岗岩碎裂岩虽然也普遍存在破碎破碎现象，但由于强烈的磨粒磨损和粉碎作用，断层岩心受到破碎尺寸减小的显著影响。1.2 m宽的断芯包括碎屑和由基性火山岩组成的尖锐暗层，可与邻近的1.6 Ma火山岩相对应。这一观察结果对断层核形成的年龄提出了更年轻的限制。在1.2 m宽的断层核心中，玄武岩碎片上的碳酸盐涂层也被破裂，表明强烈的破碎重复发生。1.2 m宽断层核附近的分叉的黑色和灰色脉可能是注入脉，是地震事件期间断层带内细物质快速注入形成的。花岗岩断层泥的特征是坚硬的花岗岩碎片，没有强烈的角化作用和微破裂，在富含高岭石的粘土基质中，被解释为暴露断裂带内最近的滑动带。对几个断裂带已发表的地质和水文研究的预览表明，富含粘土的断裂带芯的渗透率远低于相邻的由焊接凝灰岩断裂角砾岩和花岗岩碎裂岩组成的破坏带。
In order to reconstruct the architectural evolution of a fault zone with heterogeneous structures, we studied the Atera Fault in Central Japan, and described the detailed mesoscopic and microscopic features of the zone. The fault zone studied consists of a 1.2‐m wide fault core of fault breccia mixed with fragments derived from welded tuff, granite, and mafic volcanic rocks. The 1.2‐m wide fault core is bordered by a western damage zone characterized by a welded tuff fault breccia and an eastern damage zone characterized by a granite cataclasite. A secondary fault core, a 30‐cm wide granite‐derived fault gouge, cross‐cuts the granite cataclasite. Although welded tuff fault breccia and granite cataclasite are also pervasively fractured and fragmented, the fault cores are significantly affected by fragment size reduction due to intense abrasive wear and comminution. The 1.2‐m wide fault core includes fragments and a sharp dark layer composed of mafic volcanic rocks, which can be correlated with neighboring 1.6 Ma volcanic rocks. This observation places a younger constraint on the age of the fault core formation. Carbonate coating on basalt fragments in the 1.2‐m wide fault core has also been fractured indicating the repetition of intense fragmentation. Bifurcated, black and gray veins near the 1.2‐m wide fault core are likely injection veins, formed by the rapid injection of fine material within fault zones during seismic events. The granite‐derived fault gouge, characterized by hard granite fragments without intense brecciation and microfracturing, in a kaolinite‐rich clay matrix, is interpreted as the most recent slip zone within the exposed fault zone. A preview of published geological and hydrological studies of several fault zones shows that clay‐rich fault cores can exhibit much lower permeability than the adjacent damage zones represented in this present case by the welded tuff fault breccia and granite cataclasite.
影响因子：
3.1
作者：
K. Mizoguchi;T. Hirose;T. Shimamoto;E. Fukuyama
通讯作者：
K. Mizoguchi;T. Hirose;T. Shimamoto;E. Fukuyama
野岛断层的结构演化及神户地震激活滑动层的识别
DOI：
--
发表时间：
2007
期刊：
Journal of Geophysical Research 112
影响因子：
--
作者：
Koyama;Mizuno;水野俊太郎;水野俊太郎;水野俊太郎;水野俊太郎;水野 俊太郎;田中 秀実
通讯作者：
田中 秀実
影响因子：
3.1
作者：
Jefferies, SP;Holdsworth, RE;Lloyd, GE
通讯作者：
Lloyd, GE