支持向量机优化算法(SVM)的金矿成矿过程模拟--以辽西地区新太古代片麻岩为例  

Simulation of gold mineralization process with support vector machine optimization algorithm:An example of Neoarchean gneiss in Western Liaoning

作　　者：石娴 李猛猛 姜兆元 SHI Xian;LI Mengmeng;JIANG Zhaoyuan(College of Computer Science and Engineering,Guilin University of Aerospace Technology,Guilin 541004,Guangxi,China;Chemical Geological Prospecting Institute of Liaoning Province Co.,Ltd.,Jinzhou 121007,Liaoning,China)

机构地区：[1]桂林航天工业学院计算机科学与工程学院,广西桂林541004 [2]辽宁省化工地质勘查院有限责任公司,辽宁锦州121007

出　　处：《矿产与地质》2023年第5期1112-1128,共17页Mineral Resources and Geology

基　　金：桂林航天工业学院博士、教授基金项目(编号:KX202204801)资助。

摘　　要：新太古代片麻岩在辽西地区分布面积广阔,其中发育的金矿矿产资源丰富。为了开展辽西地区新太古代片麻岩中金矿成矿过程的研究,以辽西地区新太古代片麻岩中典型金矿床及矿化点矿体的组合分析数据为样本,利用基于径向基(Radial Basis Function,RBF)核函数的支持向量机(Support Vector Machine,SVM)算法进行Au、Ag、Cu、Pb、Zn元素质量分数与S元素质量分数的相关性分析,进而建立基于S元素质量分数的金矿成矿过程识别模型。根据识别模型的分析结果,将金矿床的成矿过程划分为三个阶段:Ⅰ—平缓增长阶段。该阶段处于壳幔混合状态。在洋壳俯冲作用下,破碎的岩石圈与岩浆发生混入作用,导致S元素质量分数的增加和分布不均。Ⅱ—过渡阶段,该阶段主要为侵入作用为主,随着侵入作用的持续进行,温度、压力开始下降,以亲硫性为主的Au元素在硫的作用下,局部在与围岩距离较近的位置富集。Ⅲ—快速增长阶段,随着岩浆侵入作用的不断持续,温度相对较低的地壳表层岩浆逐渐固结成岩成矿。TTG岩浆和富矿岩石包体在成岩的过程后,酸性物质在变质作用、构造运动和地表大量氧和水的混入下,结晶或重结晶成为石英条带或团块,Au元素故此分布于石英裂隙和硫化物中成矿。根据识别模型的分析结果,并结合前人的理论研究成果,说明了加深新太古代片麻岩和硫化物的研究是指导后期找矿工作的重要研究方向,为下一步找矿工作提供了相关依据,指导隐覆矿床的发现。Neoarchean gneiss is widely distributed in West Liaoning,and there are rich gold mineral resources.In order to carry out the research of the gold mineralization process in Neoarchean gneiss in West Liaoning,this paper takes the combined analysis data of typical gold deposits and mineralized ore bodies in Neoarchean gneiss in West Liaoning as the samples,and uses the support vector machine(SVM)algorithm based on the radial basis function(RBF)kernel function to carry out the correlation analysis of the mass fractions of Au,Ag,Cu,Pb,Zn and S elements.Furthermore,a gold mineralization process identification model based on the mass fraction of S element is established.According to the analysis result of the identification model,the mineralization process of gold deposit is divided into three stages,namely:Ⅰ-gentle growth stage.This stage is in a state of crust mantle mixing.Under the subduction of oceanic crust,the broken lithosphere mixes with the magma to result in the increase and uneven distribution of S element mass fraction.InⅡ-the transitional stage,the intrusion is the main process.As the intrusion continues,temperature and pressure begin to decrease.Under the action of sulfur,Au element,which is mainly sulfur friendly,is enriched locally in close proximity to the surrounding rock.DuringⅢ-the rapid growth stage,with the continuous intrusion of magma,the crust surface magma of relatively low temperature gradually consolidates for the diagenesis and mineralization process.After the diagenetic process of TTG magma and ore rich rock inclusion,acidic substance crystallizes or recrystallizes into quartz band or lump under metamorphism,tectonic movement and the mixing of a large amount of oxygen and water on the surface.Therefore,Au is distributed in quartz fracture and sulfide for mineralization.According to the analysis result of the identification model,combined with the theoretical research result of predecessor,it is explained that to deepen the research on Neoarchean gneiss and sulfide is an important res

关 键 词：新太古代片麻岩 支持向量机 核函数 成矿过程 

分 类 号：TP181[自动化与计算机技术—控制理论与控制工程] P612[自动化与计算机技术—控制科学与工程]