安徽沙溪斑岩铜（金）矿床成矿过程中热及流体传输的计算模拟  

COMPUTER SIMULATION OF HEAT AND FLUID TRANSPORT IN ORE-FORMING PROCESS IN SHAXI PORPHYRY COPPER (GOLD) DEPOSITS, ANHUI PROVINCE

作　　者：任启江[1] 郭国章[1] 徐文艺[1] 邱检生[1] 冯祖钧[1] 方长泉[1] 傅斌[1] 

机构地区：[1]南京大学地球科学系

出　　处：《南京大学学报（自然科学版）》1994年第2期295-303,共9页Journal of Nanjing University（Natural Science）

基　　金：国家自然科学基金;博士点基金

摘　　要：根据质量、动量和能量守恒定律，建立控制微分方程组．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，进而求出流速及热流值，将上述理论应用于沙溪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，为进一步研究斑岩铜矿的形成过程，提供了有意义的信息．Shaxi porphyry copper (gold) deposit is located at Tanlu fault belt. According to the data of geological setting and regional geophysics, and the detailed study on oredeposits and the measurement results of fracture abundance, the conceptual geologicalmodel and permeability distribution model have been proposed.Using these models, thepresent authors have simulated the temperature and fluid flux field around the coolingpouphyry apothysis. According to the laws of conservationof mass, momentum andenergy,a set of governing differential equations that represent migrating process ofhydrothermal fluids have been established. The distributions of streamfunction and temperature are obtained from the numerical solutions to these equations by using the finite element method. Darcy velocity and heat flux can be further calculated.The method stated above is applied to the studies on the ore-forming process of Shaxiporphyry copper (gold) deposits for calculating the distribution of temperature and fluidflux field. A satisfactary result has been obtained, which will offer important information tothe further study of o￣forrning process of porphyry copper deposits. In comparison withthe;previous study results, the present Study has improved on the permeability distributionmodel, and on the means of selecting parameters and of acquainting the numerical solutionof differential equations. A ameliorated comuter code has been established to simulate thet6mpefature and fluid flux field around cooling intrusive body. Applying the camputer codetO calculate the temperature and temperature gradient, the acquainted results are well inagreement. with the determinated data by geothermometers.The results of computer simulating for temperatrue field have shown that the effect ofsmall porphyry apophysis on the temperature field only lasts for a relatively short time, themajor energy source came from the bathylite at deep level. The convection made theheat-dispersion, whichis controlled by the high permeability of wall rocks. In order toma

关 键 词：斑岩矿床 铜矿床 成矿过程 热液体 

分 类 号：P618.41[天文地球—矿床学]