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| Microcosmic analysis of ductile shearing zones of coal seams of brittle deformation domain in superficial lithosphere | |
| 作者姓名： | JU Yiwen WANG Guiliang JIANG Bo & HOU Quanlin . Graduate School Chinese Academy of Sciences Beijing China . College of Mineral Resources and Geosciences China University of Mining & Technology Xuzhou China |
| 作者单位： | JU Yiwen1，2，WANG Guiliang2，JIANG Bo2 & HOU Quanlin1 1. Graduate School，Chinese Academy of Sciences，Beijing 100039，China; 2. College of Mineral Resources and Geosciences，China University of Mining & Technology，Xuzhou 221008，China |
| 基金项目： | 国家自然科学基金，国家重点基础研究发展计划(973计划)，the Skeleton Teacher of Higher Education |
| 摘 要： | For many years, the study on ductile shearing zones mainly focuses on the strain analysis and the characteristics of microcosmic structure of felsic duc-tile shearing zones in deep layers (8—10 km). Discus-sions on the process of the development of small-type and mini-size ductile shearing zones have been re-ported in recent years1,2]. 揇uctile deformations in brittle deformation擺3] and 揵rittle deformations in ductile deformation擺4] are rather a familiar phenome-non in nature. Researchin… |
Microcosmic analysis of ductile shearing zones of coal seams of brittle deformation domain in superficial lithosphere |
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| JU Yiwen,,WANG Guiliang,JIANG Bo & HOU Quanlin . Graduate School,Chinese Academy of Sciences,Beijing ,China, . College of Mineral Resources and Geosciences,China University of Mining & Technology,Xuzhou ,China.Microcosmic analysis of ductile shearing zones of coal seams of brittle deformation domain in superficial lithosphere[J].Science in China(Earth Sciences),2004,47(5). | |
| Authors: | JU Yiwen WANG Guiliang JIANG Bo HOU Quanlin |
| Institution: | 1. Graduate School, Chinese Academy of Sciences, Beijing 100039, China;College of Mineral Resources and Geosciences, China University of Mining & Technology, Xuzhou 221008, China 2. College of Mineral Resources and Geosciences, China University of Mining & Technology, Xuzhou 221008, China 3. Graduate School, Chinese Academy of Sciences, Beijing 100039, China |
| Abstract: | The ductile shearing zones of coal seams in a brittle deformation domain in super-ficial lithosphere are put forward based on the study on bedding shearing and ductile rheology of coal seams. The macrocosmic and microcosmic characteristics include wrinkle fold, mymonitized zones and ductile planar structure of coal seams, etc., while the microcosmic characteristics may also include different optic-axis fabrics and the anisotropy of vitrinite reflectance as well as the change of chemical structure and organic geochemistry components. The forming mechanism is analyzed and the strain environment of ductile shearing zones of coal seams discussed. The result indicates that, in the superficial brittle deformation domain, the coal seams are easy to be deformed, resulting in not only brittle deformation but also ductile shearing deformation under the action of force. Because of simple shearing stress, the interlayer gliding or ductile rheology may take place between coal seams and wall rocks. Therefore, many ductile shearing zones come into being in superficial lithosphere (<5 km). The research on ductile shearing zone of brittle de-formation domain in superficial lithosphere is significant not only theoretically for the study of ductile shearing and ductile rheology of the lithosphere but also practically for the structural movement of coal seams, the formation and accumulation of coal-bed methane, and the preven-tion and harness of gas burst in coal mine. |
| Keywords: | brittle deformation domain interlayer gliding ductile rheology ductile shearing zones of coal seams coal my-monite vitrinite reflectance anisotropy |
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