Abstract:

To understand the complexity of the development and evolution of orecontrolling fracture system in Dajishan tungsten deposit, Quannan County, Jiangxi Province, we collected rock samples at different depth of deposit, and performed experiments on rock acoustic emission. The results showed that the sequence of rock acoustic emission events has a distinctive feature, and generally goes through three processes of occurrence, quiescence and burst. The onset and development of fracture system has a cascade of avalanchespunctuated equilibrium hierarchic fractal structure. The breaking process is extremely discontinuous in time, and the energy release in the process is also discontinuous and decreasing with depth, which reflects the development of mineralization. The author applies the theory of complexity to studying the orecontrolling fractures of the veintype tungsten ore deposits in Dajishan. The following conclusions were drawn. The dynamics of the onset and development of fracture system is similar to that of the oreforming system; that is, it consists of the selforganization arising from the coupling of random motion, the coherent behavior produced by interaction between subsystems, the realization of cooperative synchronization, the occurrence of critical transition point, and the attainment of selforganized criticality. All of them result from the coupling and interaction of physical movement of minerals, time and space. The formation of veintype tungsten ore deposit in Dajishan is closely related to critical rupture of orecontrolling fracture system and its avalanchespunctuated equilibrium cascade fractal growth, i.e., the metallogenic model of veintype tungsten ore deposit in Dajishan follows the generalized “fivestoreyed type” metallogenic model.

Key words:

Key words: fracture system; acoustic emission（AE）; burst; avalanchespunctuated equilibrium; metallogenesis