Luonan-Luanchuan fault belt is a famous fault zone of the Qinling orogenic belt， which is the geological boundaries of the North China plate and Qinling orogenic belt. The strike nearly EW to fault zone developed Kuanping Group and Taowan Group rocks. The process and evolution of the rock deformation play an important role. Therefore， the analysis of the deformation characteristics of rock fracture zone and formation conditions has important significance to investigate the Luonan-Luanchuan fault belt tectonic environment and analysis ancient convergent plate boundary deformation. This paper uses Luonan-Luanchuan fault belt Luanchuan structural section as the main object of study. Through the indoor and outdoor deformation of a variety of research and test analysis， it considers the basic trend of Luonan-Luanchuan fault belt is 290° with an angle of 58°～89°. And the mylonitic foliation， mineral lineation and folds developed widely， with left lateral movement and northward subduction. The main deformation mines are quartz， calcite， biotite and muscovite. The deformation mechanism is dominated by quartz bulging and subgrain rotation of dynamic recrystallization，calcite mechanical twinning and subgrain rotation deformation. The mica deformation is mainly in strain slip cleavage. The north of Kuanping Group rock and the south of Taowan Group are plastic deformation，and the north side of the Taowan Group is brittle deformation. It correspond to Luonan-Luanchuan fault belt with the second period of northward subduction strike slip tectonic activity and the fourth period of the brittle reverse thrust nappe tectonic activity from north to south. By using mechanical twinning of calcite， muscovite pressure meter，biotite and muscovite Ti thermometer，amphibolite thermometer，we get the mineral deformation temperature of 440℃～509℃，the pressure is 0.4～1.4 GPa and the differential stress is 0.27～0.426 GPa. Namely the formation environment of the ductile shear zone belongs to medium temperature and medium pressure condition. Therefore，it is considered that the Luonan-Luanchuan fault belt（Luanchuan structural section）deformation conditions are in the shallow crust tectonic deformation environment with medium temperature and medium pressure.
Ren Shenglian,Li Jiahao,Li Longming et al. Luonan-Luanchuan fault belt（Luanchuan section）deformation and formation environment of characteristics[J]. Chinese Journal of Geology, 2016, 51(4): 1074-1089.