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以郯庐断裂带淮河南到女山湖段晚第四纪以来是否具有新活动为主要研究目标,通过遥感影像资料解译及地表反复调查,选择构造地貌显著地段开挖探槽,识别和记录其变形形态,分析其活动习性,定向采集新活动变形物质,在保持原态基础上磨制定向薄片,并进行微观构造分析论证。研究表明,断裂沿线线状构造地貌清晰,横跨断裂带的3个探槽均揭示出晚第四纪以来活动痕迹,断裂最新错断了晚更新世-全新世地层;滑移方式多表现为粘滑,典型表现为断层陡坎、楔状堆积、断层和充填裂缝等,总体显示为脆性高速变形特征,属于史前地震遗迹。上述认识部分得到微观分析证实。文中还初步探讨了淮河南北郯庐断裂最新活动特征的异同点及其可能的原因。
Based on whether there is any new activity in Huayan fault zone from the Huaihe river to the Nanshanhu fault zone in the Tan-Lu fault zone since the late Quaternary, the exploration of remote sensing image data and repeated surface surveys have made it possible to identify and record excavation trenches in significant sections of tectonic landforms Its deformation morphology, analysis of its activity habits, directional collection of new activities, deformation of the material, on the basis of maintaining the original orientation of the polished film, and micro-structure analysis and demonstration. The results show that the linear geomorphology along the fault line is clear and the three exploration trenches across the fault zone reveal the traces of activity since the late Quaternary. The latest faults were Late Pleistocene-Holocene strata. Sticky slippery, the typical performance of the fault scarp, wedge-shaped accumulation, fault and filling cracks, the overall display of brittle high-speed deformation features, belong to the prehistoric earthquake ruins. The above understanding is confirmed by micro-analysis. The similarities and differences of the latest activities of Tan-Lu fault in north-south Huaihe River and their possible reasons are also discussed.