Abstract:
Guizhou Province is located at the convergent parts of the Yangtze Plate, Jiangnan Orogen and Youjiang Orogen. Several major tectonic extensions and structural deformation due to tectonic compressions have taken place since the Neoproterozoic Era. However, the sedimentation that occurred after the late Paleozoic Era had covered those early geological structures. Studies on the deduction of the deep fractures in Guizhou Province by several authors are still limited in scope and controversial due to the insufficient data and differences in perception. In this paper, the deep four-level fault in Guizhou Province was classified with a combined application of gravity, aeromagnetic survey technologies, and geological data, which is supported strongly by the existing studies. According to the deduced results, other than the three pieces of deep Level Ⅰ fractures, which had "H-shaped" structures, 15 pieces of Level Ⅱ fractures, 12 pieces of Level Ⅲ fractures, and several pieces of basement fractures were also found. It was also deduced that each of the said fractures was resulted by the development of the fracture-level right above it. According to the artificial seismic profile, the distribution characteristics of five of the fault pieces from Level Ⅰ to Ⅲ have been tested further. The results showed that those fractures were extended to different directions and the cutting depth had reached 6~12 km. To conclude, the fractures' profile as deep fractures, which cut through the sedimentary mantle and basement, had been confirmed. Furthermore, combining the knowledge of the four-level fault and the distribution of important mineral deposits in Guizhou Province, a deduction was put forward, wherein a spatial correlation that linked the distribution of the gold, lead and zinc, antimony, manganese, phosphorus, and bauxite ores in Guizhou Province with the Level Ⅰ, Ⅱ, and Ⅲ deep fractures might have existed.
