| 陕西金堆城斑岩钼矿成矿过程中热及流体传输的计算模拟 |
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| 引用本文：.1994.Computer simulation of heat and fluid transport in the ore-forming process of the Jinduicheng porphyry molybdenum deposit, Shaanxi province[J].Mineral Deposits,13(1):88~95 |
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| 基金项目:国家自然科学基金资助项目，编号49070101 |
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| 中文摘要:在对陕西金堆城斑岩钼矿成矿地质背景和矿床地质详细研究的基础上，运用定点等积测量方法，建立了成矿过程中渗透率分布的概念模型。根据质量、动量、能量守恒定律，建立了控制微分方程组。运用有限元方法，求解数学模型，得到了热流体运移的流函数和温度分布值，进而求出流速和热流值。将前述理论应用于金堆城矿区成矿过程中温度场和流体场的研究，取得了满意的计算模拟结果。为进一步研究斑岩钼矿的形成过程，提供了有意义的信息。与国外同类研究相比，在渗透率分布模型的建立、数值解的方法及程序设计等方面，亦有一定特色。 |
| 中文关键词:斑岩钼矿 热及流体传输 有限元 计算模拟 |
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| Computer simulation of heat and fluid transport in the ore-forming process of the Jinduicheng porphyry molybdenum deposit, Shaanxi province |
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| Abstract:On the basis of detailed studies on the geological setting, ore-forming process and ore-bearing fissure systems of the Jinduicheng porphyry molybdenum deposit, Shaanxi Province, the geological conceptual model and distribution pattern of permeability have been established for the Jinduicheng deposits.According to the law of conservation of mass, momentum and energy, a set of governing differential equations representing transport phenomena of heat and fluid during the ore-forming process have been proposed. The distribution patterns of stream function and temperature are obtained through the numerical solution to these equations by using the finite element method, and Darcy velocity and heat flux can be further calculated. The results of the study show: (1)The hydrothermal system has a temperature gradient as high as 100℃ to 120℃per kilometer. The heat anomaly may last over n×105 years, which is comparable with the active geothermal system in the modern volcanic areas. (2)As porphyry stocks connect with a batholith at depth，the temperature field is controlled mainly by the batholiths. (3)The distribution patterns of stream function and Darcy velocity are dependent on the permeability of wall rocks, and the orebodies are located in the area which has the largest velocity and the highest density of stream function. (4)The distribution patterns of Darcy velocity and stream function are related to the shape and mode of occurrence of the intrusive body. In the vicinity of the orebodies, the Darcy velocity changed obviously during the ore-forming process. This mainly resulted from the variation in permeabilifies of rocks. In comparison with the previous similar work, this study has the following Features: (1)The geological model and the distribution pattern are established on the basis of the studies on large quantities of geological data. (2)The selection of parameters and the calculation results have been examined by the observation data of modern active geothermal systems. (3)For the simulation of heat and fluid transport, the variation in permeability in space and time and the disparity in physical features of rocks have been considered. (4)The Ritz and Galerkin methods have been applied in the finite elemerit analysis. The computational programs are easily understandable and are also ready to be modified and enlarged. In addition, the structure of the programs is very clear. All the computer results are output in the way of contour diagrams,
including streamline map, isothermal map and Darcy velocity distribution map. |
| keywords:porphyry molybdenum deposit, heat and fluid transport, finite element, computer simulation |
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