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依据区域构造层次划分,采用构造筛分法,层层深入,层层筛分,确定发生于各个不同时代地层/岩层内的断裂活动的同期及叠加的应力场特征。综合所有的同期应力场特征及辅以叠加的应力场特征来验证,从而确定了一个连续的、完整的断裂活动的应力场演化序列;结合区域构造变形特征分析,阐明郯庐断裂带(安徽段)的构造演化。应力场分析显示:晚三叠-早侏罗世应力场为北北西—南南东或近南北向挤压,属古特提斯构造域,断裂发生同造山走滑;早白垩世早期,应力场为北西—南东向挤压,断裂发生左行走滑运动,中国东部处于西环太平洋构造域;早白垩世晚期—古新世(始新世),区域发生北西—南东向伸展作用,断裂处于伸展断陷作用阶段;新生代,受区域上近东西向的挤压作用影响,断裂发生挤压逆冲兼右行走滑作用。
According to the division of regional tectonic hierarchy, the tectonic-sieving method is adopted to deepen the stratification and stratification to determine the characteristics of the stress field during the syn-formation and superimposition of the faults occurring in different age strata / strata. Based on the characteristics of all the stress fields in the same period and the stress fields superimposed with them, the sequence of stress field evolution in a continuous and complete fault activity is confirmed. Based on the analysis of the regional tectonic deformation, the Tan-Lu fault zone ) Tectonic evolution. The stress field analysis shows that the Late Triassic-Early Jurassic crustal stress field is north-northwest-south-south east or near-north-south crustal tectonism, and belongs to the Gut Tertis tectonism. The fracture occurred along the orogenic orogenesis; Early Cretaceous, the stress In the northwestern-southern-eastern crust, the left-lateral slip occurred in the crust. The eastern part of China is in the western Pacific Rim tectonic domain. In the late Early Cretaceous-Paleocene (Eocene), the North-South- The fault is in the stage of extensional faulting. In the Cenozoic, affected by the extrusion in the east-west direction in the area, the fracture is subjected to crushing, thrusting and right-lateral strike slip.