Styles and Coal-Controlling Effects of Detachment Structure in Some Coalfields of Southeast China

Coal-scarcity provinces of southeast China, such as Jiangxi, Guangxi, Guangdong, and so on, have successively experienced the effects of paleo and modern Pacific geodynamic system, resulting in multilevel and multi-phase detachment structure developed broadly. According to the geodynamic characteristics, the detachment structure styles in study area are divided into nappe-type, gliding nappe-type and superimposed type, and subdivided into eight second-order structure styles, with analyzing their coal-controlling effects. The results show that: detachment structure is the main controlling factor of the structural reform of coal-bearing stratum and the preservation condition of coal resource, and among them, the superimposed type is the most principal coal-controlling structure style. Based on regularizing structure styles by means of anew examining and verifying fault point combination, to discover coal under nappe and gliding nappe is an important direction of coal resource exploration and exploitation.