基于多源数据约束的成矿动力学模拟——以宁芜盆地钟姑矿田典型矿床为例

数据驱动是大数据分析的特点之一。成矿过程的数值模拟即采用数据驱动方式，在基本的物理化学方程及地质模型基础上，通过定量的手段，模拟不同阶段、不同条件下成矿系统的演化过程，从而能够更深入、直观的讨论各种地质要素对成矿系统的影响，验证已有的成矿理论，获得新的认识。姑山铁矿床和杨庄铁矿床是宁芜火山岩盆地钟姑矿田内的典型矿床。前人研究显示，杨庄铁矿床为典型的充填-接触交代型热液矿床，而姑山铁矿床目前在成因上仍存在争议，存在岩浆成因和热液成因等多种观点。为了更好的对比和了解姑山铁矿床和杨庄铁矿床的成因及成矿过程，本文基于多源数据的综合解译剖面，采用力-热耦合数值模拟方法对与热液矿床密切相关的扩容空间的形成机制和特点开展研究。模拟结果显示，姑山铁矿床和杨庄铁矿床可能分属不同的成因类型；随着岩体的逐渐冷却，杨庄铁矿床内岩体和地层接触带会出现明显的扩容空间，可为成矿流体的汇聚及矿质的沉淀提供良好的条件，有利于热液矿床的形成；而姑山铁矿床内岩体和地层接触带只有局部区域出现扩容空间，同时体应变数值较小且形态变化大，并不利于大规模的流体汇聚及矿质的沉淀，姑山铁矿床可能主要为岩浆成因，并受少量热液的叠加改造。

Metallogenic dynamics simulation based on multi?source data constraint: A case study of the typical deposit in Zhonggu ore field in Ningwu Basin

As one of the characteristics of big data analysis, the data-driven approach is applied into the numerical simulation of the ore-forming process. Based on basic physical and chemical equation and geological model, it simulates the evolution process of metallogenic system under different conditions in different stages by quantitative approach. It provides a more direct perspective for the study of the influence of various geological factors on the metallogenic system, verifying the existing metallogenic theory for a better understanding. Gushan iron deposit and Yangzhuang iron deposit are typical deposits which lies in Zhonggu ore field in Ningwu volcanic basin. Previous study shows that Yangzhuang iron deposit is a typical hydrothermal deposit of filling-contact metasomatic type, while the origin of Gushan iron deposit remains controversial: magmatic or hydrothermal origin. In order to further the comparison and comprehension of the genesis and metallogenic process of Gushan iron deposit and Yangzhuang iron deposit, in this paper, based on a comprehensive interpretation of the sections from multi-source data, the author adopts force-thermal coupling numerical simulation to carry out research into the space expansion mechanism and characteristics closely related to hydrothermal deposit. The simulation results show that there may be different genetic types in Gushan iron deposit and Yangzhuang 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 Gushan iron deposit, however, the expansion space only appears partially in the rock mass and stratum contact zone. Meanwhile, the volume strain value is small with big morphology changes, not good for large-scale fluid convergence or mineral precipitation. The results show that Gushan iron deposit may be mainly of magmatic origin and modified by a small amount of hydrothermal superposition.