赣北地区地台盖层中的滑脱断裂及其意义

The Detachment Fault in Platform Caprock in Northern Jiangxi Province

赣北地区属扬子准地台的一个组成部分,其地台盖层中的滑脱断裂与滑脱褶皱紧密伴生,共同构成滑脱构造。滑脱断裂沿地台盖层中的软弱面、润滑层发育。滑脱断裂的总体产状是后缘倾角较缓,向前缘逐渐变陡至倒转;在平面上与地层走向一致,方向变化较大,因地而异、各不相同。滑脱断裂的构造样式,以短轴背形、向形构造为主,另有穹窿构造、滑来峰构造、滑覆窗构造。滑脱断裂是良好的内生热液矿床的储矿构造;滑脱断裂形成于中生代,大多己褶皱变形,工程地质条件良好。

Detachment fault were closely associated with detachment fold and they formed the detachment structure together in caprock of platform which is a part of Yangtz platform. The detachment fault were formed in the weak-lubricant layer in the platform caprock. The detachment structure slops lightly in backside, is steepened gradually frontward and reversed even. Its strike is consistent with strata and is varied greatly. The styles of the detachment structure are short antiform and synform structure mainly, and dome structure, nappe outlier and nappe tectonic window too. The detachment fault is good prospecting targets for hypogenic hydrothermal deposit. The detachment fault is formed in Mesozoic era, has folding deformation and good engineering geological environment.