Ore-Controlling Fracture Mechanism of Vein-Type Tungsten Ore Deposits in Dajishan Jiangxi Province of China
Fragmentation can be seen in various materials, and it happens at different scales. Recent researches indicate that the earth material will crack along the existing weak zone of different scaling and its fracture shows a hierarchical structure, that is to say, the fracture under macroscopic scaling is the consequence of accumulation of smaller scaling fracture, The amount of previous results shows that the cumulative frequency distribution of fragment size is similar to power-law distribution. A power-law distribution of fragment size indicates that fragmentation possesses a scaling law, namely fractal theory of fragmentation. This work studies the famous five-storeyed morphological vertical zonation of the vein-type tungsten ore deposits in Huangsha and Dajishan of Southern Jiangxi Province from theoretical analysis and acoustic emission experiment. The ore-controlling multiple fractures of vein-type tungsten ore deposits is radiated and gradually bifurcated into hemispheric morphological distribution in three-dimensional space, and belong to the local structures completely different from geologic structure framework of region and ore region. The ore-controlling multiple fractures of the vein-type tungsten ore deposits are heat-induced and fluid-driven fractures dominated by hydraulic fracturing. The five-storeyed type morphological vertical zonation of me vein-type tungsten ore deposits is the consequence of fractal dilatation of multiple hydraulic fracturing. The self-organized criticality of the vein-type tungsten ore deposits is the origin of multiple fractal dilatation, while the steepest gradients of hydraulic stress field around the dp of mesoscopic cracks is the driving force of fractal dilatation.
Ningqiang Liu Chongwen Yu Yongshun Liu Nian Peng
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;Facul College of Resources, Environment and Tourism, Capital Normal University, No.105 Xisanhuan Beilu, Ha
国际会议
The 12th Conference of the International Association for Mathematical Geology(第12届国际数学地质大会)
北京
英文
56-58
2007-08-26（万方平台首次上网日期，不代表论文的发表时间）