| 活动断裂带内第四纪松散沉积物的变形类型 |
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| 引用本文： | 晁洪太,邓起东,李家灵,王志才,满洪敏.活动断裂带内第四纪松散沉积物的变形类型[J].地震地质,2001,23(3):399-406,T003. |
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| 作者姓名： | 晁洪太 邓起东 李家灵 王志才 满洪敏 |
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| 作者单位： | 1. 山东省地震局
2. 中国地震局地质研究所 |
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| 基金项目： | 山东省自然科学基金 (95E2 0 38)，地震科学联合基金 (95 0 0 0 5 9) |
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| 摘 要： | 选择了一些典型活断层地质剖面 ,对经受了构造变动的第四纪松散沉积物进行了定向原状样品采集。通过室内样品固结、显微薄片制作和显微构造现象观察 ,从显微域里找到了第四纪松散沉积物变形的一些特点 ,并进行了分类。第四纪松散沉积物的变形类型有两种 :一种是破裂变形 ,主要表现为平行滑动条带、平直滑动界面、碎屑颗粒的破碎等 ;另一种是流动变形 ,主要表现为 :流动构造、碎砾旋转、粘土矿物的拖曳滑动等
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| 关 键 词： | 松散沉积物 构造变形 显微构造 活动断裂带 第四纪 |
DEFORMATION STYLES OF UNCONSOLIDATED QUATERNARY SEDIMENTS ON ACTIVE FAULTS |
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| Chao Hongtai Deng Qidong Li Jialing Wang Zhicai Man Hongmin Seismological Bureau of Shandong Province,Jinan Institute of Geology,China Seismological Bureau,Beijing.DEFORMATION STYLES OF UNCONSOLIDATED QUATERNARY SEDIMENTS ON ACTIVE FAULTS[J].Seismology and Geology,2001,23(3):399-406,T003. |
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| Authors: | Chao Hongtai Deng Qidong Li Jialing Wang Zhicai Man Hongmin Seismological Bureau of Shandong Province Jinan Institute of Geology China Seismological Bureau Beijing |
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| Institution: | Chao Hongtai 1) Deng Qidong 2) Li Jialing 1) Wang Zhicai 1) Man Hongmin 1) 1) Seismological Bureau of Shandong Province,Jinan 250014 2) Institute of Geology,China Seismological Bureau,Beijing 100029 |
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| Abstract: | Unconsolidated Quaternary sediments are widely distributed on the Earth surface. As active faults usually disturb the Quaternary sediments, the study of the deformation styles of these sediments is therefore of great significance to the assessment of fault activity and property. Oriented samples of unconsolidated Quaternary sediments deformed by faulting have been collected from some typical active fault profiles. They were solidified in lab by filling epoxy resin diluted by acetone with solidified agent. Oriented thin sections were cut according to the primitive orientations of the samples in the field. Deformation features of the samples were observed carefully under optical microscope. An attempt has been made to identify the deformation microstructures of the samples, which may reflect the features of faulting. The observations show that the deformation in unconsolidated Quaternary sediments can be classified into two styles: fracturing and flow. The fracturing deformation is represented by parallel slip bands, straight slip planes, broken mineral grains etc, while the flow deformation is characterized by flow structures, mineral grain rotation, drag structure of clay minerals and others. The deformation style and property of unconsolidated Quaternary sediments depend to a large extent on the characteristics of the sediments themselves. Unconsolidated Quaternary sediments are composed mainly of clastic grains and clays. They can be considered as a visco-elastic body, and may behave as elastic-plastic materials. The duration of applied force has a great effect on the deformation behavior of unconsolidated Quaternary sediments. It means that strain rate plays an important role in the deformation behavior of unconsolidated Quaternary sediments. It is suggested that the fracturing deformation is generated by high strain rate event such as earthquake, while the flow deformation is generated by low strain rate event such as creep slip. The detailed observation of deformation styles of unconsolidated Quaternary sediments,therefore, may provide important information on the kinetic process of faulting. |
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| Keywords: | Unconsolidated sediments Structural deformation Microstructures Active fault Quaternary |
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