川西巴塘地区断裂构造变形研究

发布时间：2018-06-21 05:50

本文选题：巴塘地区 + 断裂构造　；参考：《成都理工大学》2016年硕士论文

【摘要】：川西巴塘地区位于金沙江断裂带的中部,三江造山带以东、扬子板块以西、松潘-甘孜造山带西南部边缘金沙江缝合带的主体位置,是东特提斯构造带的重要组成部分。作者对巴塘地区断裂构造变形研究包括几何学、运动学和动力学,并且对于本地区的地质演化进行了系统分析。对于三江造山带,松潘-甘孜造山带及扬子板块的形成与演化具有重要意义。本文涉及的巴塘地区断裂构造包括莫西-巴塘断裂,沙马-桑曲断裂,昌盖-那玛阔断裂,和查龙-然布断裂。其中巴塘断裂斜切金沙江断裂带主体,其形成时间应稍晚于金沙江构造带,是一右旋走滑运动的活动断裂。作者应用构造解析法对巴塘地区断裂构造的几何形态进行系统描述,对本地区断裂构造的运动学及动力学方面进行构造解析研究,并对本区内断裂构造变形期次和区域构造演化进行深入探讨。本文认为自印支期末期至今,巴塘地区断裂构造的变形期次至少可达5期。早期约发生在印支末期,发生了NEE-SWW向的碰撞挤压,在此期应力下,形成了莫西-巴塘断裂断带内巨大的透镜化角砾岩、沙马-桑曲断裂的构造透镜体和查龙-然布断裂的构造角砾岩。第二期变形大致发生在印支末期,其主应力方向为NNW-SSE,在此应力作用下,形成了莫西-巴塘断裂的早期左旋运动。第三期发生在燕山期,最大主应力方向为NEE-SWW,在此应力挤压作用下,形成了沙马-桑曲断裂断带内的直立擦痕。第四期发生在喜马拉雅期,主应力方向为近E-W,在此应力下形成了莫西-巴塘断裂的整体右旋运动。第五期运动发生在喜马拉雅期,近S-N向挤压,σ1较陡,形成了莫西-巴塘断裂周边断裂的碎粉带和局部地区因拉张应力形成的正断层。正是因为多期次多方向的区域应力造就了如今复杂的巴塘地区断裂构造形迹。
[Abstract]:The Batang area in western Sichuan is located in the middle of the Jinshajiang fault zone, east of the Sanjiang orogenic belt, west of the Yangtze plate, and the main position of the Jinshajiang suture zone on the southwest margin of the Songpan-Ganzi orogenic belt, which is an important part of the East Tethys tectonic belt. The authors study the structural deformation of faults in Batang area including geometry, kinematics and dynamics, and make a systematic analysis of the geological evolution of the area. It is of great significance to the formation and evolution of Sanjiang orogenic belt, Songpan-Ganzi orogenic belt and Yangtze plate. The faults in Batang area include the Moxi-Batang fault, the Shama-Sanqu fault, the Changgai-Namaqua fault, and the Charongranbu fault. The main body of the Jinshajiang fault zone is obliquely cut by the Batang fault, which should be formed later than the Jinshajiang tectonic zone, and is an active fault of the dextral strike-slip movement. The authors systematically describe the geometry of the fault structures in Batang area by using the structural analysis method, and study the kinematics and dynamics of the fault structures in this area. The tectonic deformation stage and regional tectonic evolution in this area are also discussed. From the Indosinian period to the present, it is considered that the deformation stages of the faults in Batang area can reach at least 5 periods. The early stage occurred at the end of Indosinian, and NEE-SWW collisional compression took place. Under the stress of this period, a huge lenticular breccia was formed in the Moxi-Batang fault zone. The structural lens of the Shama-Sangqu fault and the tectonic breccia of the Charongranbu fault. The second stage of deformation occurred at the end of Indosinian and its principal stress direction was NNW-SSE. under this stress the early left-handed movement of Moxi-Batang fault was formed. The third stage occurred in the Yanshanian period, and the maximum principal stress direction was NEE-SWW. Under this stress compression, the vertical scratch was formed in the Shama-Sangqu fault zone. The fourth stage occurred in the Himalayan period, and the principal stress direction was near E-W, under which the whole dextral movement of Moxi-Batang fault was formed. The fifth phase movement occurred in the Himalayan period, near S-N compression, 蟽 1 is steeper, forming the comminuted zone around the Moxi-Batang fault and the normal fault formed by the tensile stress in the local area. It is because of the multi-phase and multi-direction regional stress that the complex patang fault structure is formed.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P542.3

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