Numerical Simulation Of Metallogenic Process Of The Typical Deposit In Zhonggu Ore Field In Ningwu Basin

Based on basic physical and chemical equation and geological models,the numerical simulation employs numerical calculation methods such as finite difference or finite element to simulate the evolution of metallogenic system in different stages and under different conditions.It provides a deeper and more direct perspective for the study of the influence of various geological factors on the metallogenic system,thus verifying the existing metallogenic theory for a better understanding.In order to carry out a further comparison and analysis of the ore-forming process of the above typical iron deposits,and with a probe into the intrinsic mechanism of deposit formation,in this paper,it constructs the geological model on the basis of the interpretation of multi-source data.Under the force-thermal coupling condition,it carries out the numerical simulation of the metallogenic process of different deposit with the use of finite difference method.During the process of numerical simulation,the study focuses on the space expansion mechanism closely related to ore formation.And it also explains the genesis of deposit through the characteristics of the expansion space of typical deposits.The results show that that there may be different genetic types in Gushan iron deposit,Yangzhuang iron deposit and Baixiangshan iron deposit.With the cooling of the rock mass,obvious expansion space appears in the contact zone of rock mass and stratum within Yangzhuang iron deposit,which provides favorable conditions for the convergence of ore-forming fluid and mineral precipitation,good for the formation of hydrothermal ore deposits.In Baixiangshan iron deposit,there is obvious difference concerning the time of the formation of expansion space with its mechanism of different characteristics.In Gushan iron deposit,the expansion space appears partially near the contact zone between the rock mass and strata,of small volume strain value,large spatial morphological change of capacity expansion but with short duration,which is not conductive to large-scale fluid convergence and mineral precipitation.It shows that Gushan iron deposit may be mainly magmatic genesis and may be modified by a small amount of hydrothermal superposition in the later stage.The above research results can provide quantitative and evidence support for the genesis of typical deposits in Zhonggu ore field.In addition,the uncertainty of simulation parameters is analyzed systematically.The results show that the expansion space of Baixiangshan iron deposit is more likely to be formed in the tectonic environment with low or no tension velocity,while Yangzhuang iron deposit and Gushan iron deposit are not significantly affected by the tectonic environment.Besides,different rock physical parameters will also affect the formation of expansion space,in which the expansion angle of rock mass plays an important role in the formation of expansion space,which needs to be determines and paid attention to in the process of numerical simulaiton.