A Dynamic Analysis of the Geological Environment and Micro-structural System of the Quaternary Sedimentary Gravelsin the Lushan Area of China
中国庐山第四纪沉积砾石的显微构造系统及地质环境动力学分析

Based on many years work of regional geological investigation and an analysis of Quaternary environ-ment development, the authors studied the microscopic structure of the deformed gravels in loose sediments along the Dajiaochang valley section in Lulin basin of Lushan area and detected the existence of the special mi-cro-fissure fabric inside the deformed gravel, which assumes the complex assemblage of displacement crack -transversal crack - cleavage crack - explosion crack - composite crack - stress minerals, whose structural plane characteristic show that the mechanic qualities of the microscopic structure features are interchangeable. Synthetic material data and physical model analysis as well as experimental deformation contrast have demonstrated that the deformed gravel underwent the prolonged and simultaneous multi-boundary external force condition and the equi-librant system characterized by intensiveness and scattering. The internal breaking, the stress transmission process, the quality variation with the change of the transformation structure features and the continuous expansion of the work-doing resulted from the weak stress of the pulsation action lower than the fatigue limit. Researches on the earth's land surface processes and the geological environment essential factor and its dynamic mechanism have demonstrated that only with the equilibrant system of the low-temperature and low-stress and the scattered as well as dense multi-grains, the boundary condition for the slow, long-term and intermittent pulsation action can meet the formation conditions of such a rock deformation structure. These achievements have provided new scientific evidence for the possible existence of Quaternary frost environment and glacial action in mountainous areas of eastern China.