银山多金属矿床成矿分带的流体动力学计算模拟

对江西银山矿床流体动力学热质输运数值模拟研究表明，矿区出露的火山岩墙尽管与矿化有密切的时空联系，但不能产生持久高强度的引起大范围矿化的能量场。模拟证实，矿区深８中存在隐伏岩体，其形态可能受银山背斜的控制，岩体顶面向南缓倾是矿化由早至晚由北东向南西迁移的主要原因。模拟结果合理解释了矿床分带的偏心规律。运用流体动力学计算模拟进行深部成岩预测，取得了预期效果。

FLUID DYNAMICS AND NUMERICAL SIMULATION OF ORE ZONING OF YINSHAN POLYMETALLIC DEPOSIT IN DEXING, JIANGXI PROVINCE

Fluid dynamics and numerical simulation have been applied to the study of the Yinshan deposit in Jiangxi Province. As a result of the simulation, the following conclusions have been drawn: (1) Even though there are close relations between the subvolcanic dikes outcropped in district and ore bodies in space and time, it is obvious that No.3 dacite porphyry and several other dikes cannot provide enough materials and support a continual and powerful energy field required for the formation of a large and composite polymetallic deposit. (2) It has been confirmed by the simulation that there is a concealed igneous body in the depth of Yinshan district, which coincides with the results of geological and geophysical studies. This body may sustain a long period of thermal flux and provide adequate material and fluid for ore deposition. (3) The shape of the concealed igneous body at depth may be controlled by Yinshan anticline. The southeastwardly gently dipping top surface of the concealed igneous body presumed may be responsible for the transfer of ore_forming processes from NE to SW. It can also explain the asymmetry, directionality and superposition of ore zoning exhibited by Yinshan deposit. The subvolcanic dikes link concealed igneous body in depth and are exposed as individual centers of thermal transfer and fluid circulation generate the multicentering of ore_forming processes. The results of fluid dynamics numerical simulation consistent with geological phenomena shows that the objective expected has reached.