East Qinling - Dabie Orogenic Belt North Side Of The Tectonic Deformation Study

Qinling-Dabie orogenic belt is the tectonic amalgamation belt of Yangtze plate and North China plate, of which the East Qinling-the northern margin of Dabie organic belt is the main component part. This paper studied the tectonic characteristics, analysed tectonic actions during different periods, remolded the current structure of the East Qinling-the northern margin of Dabie orogenic belt and established the differences between the vertical and horizontal tectonic deformation.It is of great value in making clear the relationship between the basin and the mountion in this region and geological prospecting.On the basis of systematically summing up the results of the previous research, under the guide of mobilism and tectonic history view, through the methods of tectonics,petrology and geophysics, field research and laboratory analysis, the Qinling-the north Dabie orogenic belt structural characteristics and tectonic evolution come to the following conclusions and awareness.(1) Compromise based on the regional geophysical characteristics in the study area, the important tectonic boundary is established by the Shangnan-Xinyang-Shucheng fracture, Luanchuan-Fangcheng-Minggnag-feixi fracture and Lingbao-Lushan queshan-Gushi-feidong crack band.According to the main tectonic boundaries and evolutionary processes to shangnan-Xinyang-Shucheng fault and Xiangfan-Guang Ji fault bounded, the study area are divided into three blocks:the North China block, Qinling block and Yangtze block, Among them, Lingbao-Lushan-queshan-Gushi-feidong fault zone is bounded, by which the North China block is divided into the southern North China Block and North China block headquarters, and in the southern of North China block, Luanchuan-Fangcheng-Minggang-feixi fault again divided into the North Qinling tectonic belt and the southern margin of North China block tectonic belt.(2) According to research stratigraphic contact, Indo-China as the main interface, the East Qinling-the northern margin of Dabie orogenic belt can be divided into three tectonic regions:the basement, basin cap rock and overlying layers, the basin basement shall be pre-Indo-China structural layer, while the basin cap rock can be further divided into sub-structural layer Indosinian early Yanshan tectonic sub-layer, in the Yanshan tectonic sub-late Yanshan-Early Himalayan sub-structural layer, late Himalayan sub-structural layer, Quaternary sediments overlying layer. As a research subject in the study area the sub-basin tectonic cap rock can be further divided into a series of less-grand structural layer.(3) The tectonic deformation features of four main geological sections are established in the study area:Xixia-Yichuan profile, Tongbai-Wuyang profile, Xinxian-Guangshan profiles and Liuan-Yuexi profile.(4) Through analysis the remnants stratigraphic distribution, tectonic chronology and rock fabric, balanced cross-section analysis, and paleo-stress analysis, established the research of differences in tectonic deformation, deformation styles and deformation analysis in the present-day structural unit, the differences in deformation of the various tectonic units are made clear.