江西九瑞地区成矿四维结构及深部铜金资源潜力

Four-Dimensional Structure of Mineralization and Copper-Gold Resources Potential in Jiujiang-Ruichang Area of Jiangxi Province

摘要: 重点矿集区成矿四维时空结构是深部找矿的重要研究方向，九瑞地区近年完成了一系列地球物理调查工作，对航磁、重力和音频大地电磁的三维反演，获得矿集区地层及岩浆岩三维空间分布形态和结构特点，综合成岩–成矿的空间和年代研究，形成九瑞地区成矿时空结构的认识。推断九瑞成矿带深部赋矿层位在1000 m~1200 m深度，成矿空间主要是晚古生代伸展坳陷的沉积盆地；矿床控制因素受“四带一面”控制，形成了带内特有的广义矽卡岩型“多位一体”铜金矿床成矿模式；成矿作用受海西期海底喷流成矿系统(328~345 Ma)和燕山期岩浆热液叠加–改造成矿系统(138~148 Ma)的双重控制。深部铜金的找矿方向应该在通江岭–邓家山一带，建议关注东雷湾岩体西部接触带，通江岭岩体–猫母山地区以及邓家山周边三处地区。

Abstract: The four-dimensional space-time structure of mineralization in key ore gathering areas is an important research direction in deep prospecting. Jiujiang-Ruichang area has completed a series of geophysical survey work in recent years. The three dimensional spatial distribution and structural characteristics of the strata and magmatic rocks in the ore gathering area are obtained through three dimensional inversions of integrated aeromagnetic, gravity and AMT methods. Based on the study of the space and age of diagenesis and mineralization, the understanding of the spatial and temporal structure of mineralization in Jiujiang-Ruichang area is formed. It is concluded that the deep ore-bearing bed in the Jiujiang-Ruichang metallogenic belt is 1000 m - 1200 m. The ore-forming space is mainly a sedimentary basin of extensional depression in Late Paleozoic. The controlling factors of ore deposits formation by “four belts and one side”, forming a unique metallogenic model of the generalized “skarn type” copper-gold deposit in the belt. The mineralization is controlled of the submarine exhalative sedimentation metallogenic system (328 - 345 Ma) in Hercynian and the magmatic hydrothermal superimposed reformed metallogenic system in Yanshan (138 - 148 Ma). The prospecting direction for deep copper-gold should be in Tongjiangling and Dengjiashan area. It is suggested that attention to Dongleiwan, Tongjiangling-Mamushan and Dengjiashan in three regions.