Computer Simulation Of Mineralization Heat Flow In Lgneous Region In Eastern Zhejiang Province, China

Computer simulation builds simulation model on the base of computerand models running state and changes procession of real system along withtime. Computer simulation is an effective experimental technique using itcreates a kind of computer experimentation environments for complex system,the capacity and long-term dynamic nature of system were comprehensiveperformed in the short time by the computer. With the development oftechniques, the application of simulation is expanding, there appear so manysimulation styles, many projects and scientific problems are resolved bysimulation. Especially recent years, it resolved many geological difficulties.Therefore, computer simulation will become an important way to applycomputer science to geology science.Metallogenetic series is a series of ore deposits located in the samegeological tectonics which have definite comparability in the mineralization time,ore-forming mechanism, some commonness in the cause of metallogenetic andgeological conditions of controlling ore deposits, intrinsic relation in the outputof the ore deposition and space distribution. The ore deposit distribution ofmetallogenetic series in the igneous region, as their kinds and the causes offorming, are various and complex. The different type ore deposits were formedin terms of different metallogenetic evolvement phases, different concretemetallogenetic location, different conditions of the tectonic and wall rock. In theigneous region in eastern Zhejiang province, metallogenetic series' spacebanding has dual characteristics which are deposition genus banding andforming cause banding. Surrounding the core of the volcanic framework,depositions show high temperature, medium temperature, low temperaturebanding output from inner to outer and from deep to shallow. The cause typeof ore-forming appears hydrothermal after magma type phase, porphyry,hydrothermal-pseudomorphic replacement type, volcanic sedimentary type andintergrade type sequence output.Through detailed studying of metallogenetic geological background,controlling conditions of deposition and metallogenetic law, from fluid dynamicsof ore-forming processes, author thinks the fundamental metallogenetic factorof metallogenetic series in the igneous region is heat-substance flowing andtransporting in thermodynamic field in metallogenetic phase, heat-flow field'sdynamic temporal and spatial evolvement should be concrete embodiment ofunification ore-forming processes. Magmatic intruding to the porous medium(wall rock)full bearing liquid arose the temperature gradient which inducequantity of heat conduct from magmatic to wall rock and magmatic becomecooling, on the other hand, which induce density gradient in the liquid in themedium. The two action change the field of heat flow in the ore-forming system.Metallogenetic geological fluid diffuses and transports with the driving of heatpower, sediments one after another in the right location and finally forms themetallogenetic series.In the light of this idea, we apply computer simulation technique tosimulate and modeling the field of the heat flow in the igneous region in easternZhejiang province. First of all, constitute the controlling equation sets in termsof the law of mass conservation, the law of energy conservation, and Darcy law.Then following the procedure of computer simulation, it is established themathematical model and simulation model by coding programs. The third, thesimulation experiment is conducted. Finally the simulation results are outputwith drawing flow line charts and temperature distribution charts by the figurefunction of the Matlab software.Figure1. Flow line chart and temperature distribution chart of heat-flow inmineralization regionsWe suppose that the study areas are porous medium full bearing fluid,although there are respective porosities and permeability in differentlocations, the movement of fluid is seepage basically satisfying Darcy law.Math model was described by a set of equations (including conservationequation, movement equation, state equation). For conveniently dynamicanalysis and numerical computing, the sets of equations were concludedwith Boussinesq approximation and de-dimension. Finally a set of partialdifferential equation consists of an ellipse equation set and a parabolicequation set is obtained. Boundary condition and initial condition wereconstituted according to the peculiarity of study areas and real situation.It is hard to solve the coupled partial deferential equations because thereare no exact resolving methods at present time. We apply the finitedifferential method to discrete numerical value for mathematical model andboundary conditions, then deducted the computer simulation model. Basedon the Matalb platform, the programs were coded with Matlab language.Finally the heat-flow fields in mineralization regions are represented withflow-line charts and temperature distribution charts. In order to verify thesimulation model and study the effective of dynamic coefficients tosimulation results, the simulation experiment is conducted with variousvalues of permeability, porosity, and viscosity coefficient within reasonablevalues. The system of heat-flow field is reacted correspondingly to theexperiments, and we can conclude that the quantitative model is acceptableand has reflected the real world of the heat-flow fields.Considering real magnetic intrusions, we simulated three shapes ofmagnetic intrusions, and the results are same. Through computersimulation, we conclude that heat-flow field played an important role inmeineralization of metallogenic series accruing and space evolution inigneous region in eastern Zhejiang province. The basic mechanism ofthe mineralization of metallogenic series was heat-flowing and circulatingwith attracting minerals from deep bottom, transporting them tosomewhere then minerals were deposited.The unique aspects of this paper are as follows:1) A new idea and method regarding discovering mineralizationmechanism for a group of ore deposits which are originally relatedeach other has been proposed firstly in this paper. With theproposed method, the forming and distribution regulation ofmetallogenic series of ore deposits can be quantitatively revealedand described by computer simulation.2) A quantitative model, a dynamic equation of heat-flow, has beenestablished upon studying the mechanism of heat-flow andvarious factors of mineralization and analyzing the geologicalbackground, the ore-controlling factors, and the mineralizationmechanism in igneous region in eastern Zhejiang Province. Thismodel represents key controlling factors and relationship ofindependent ore deposits in the chain of metallogenic series. Thisstudy is significant for further establishing quantitative predictionmodel of metallogenic series and discovering buried ore deposits.3) A set of programs of computer simulating heat-flow is developedwith Matlab professional tool that can monitor the formingprocedure of metallogenic series heat-flow fields.Combining computer simulation techniques with quantitative study ofmetallogenic series firstly proposed in this paper that open up a new wayand may eventually solve the problem of shortage of mineral resources inChina.