铜绿山矿床蚀变矿物光谱EVS三维可视化建模及指示意义  

EVS 3D visual modeling and its significance for identifying altered mineral spectra in the Tonglushan deposit,Eastern China

作　　者：姚亦菲 王金林[1,3] 陈华勇 张世涛[5] 初高彬 YAO Yifei;WANG Jinlin;CHEN Huayong;ZHANG Shitao;CHU Gaobin(Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,Xinjiang,China;Key Laboratory of Mineralogy and Metallogeny,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,Guandong,China;University of Chinese Academy of Sciences,Beijing 100049,China;Guangdong Provincial Key Laboratory of Mineral Physics and Materials,Guangzhou 510640,Guangdong,China;State Key Laboratory of Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,Guizhou,China)

机构地区：[1]中国科学院新疆生态与地理研究所,新疆乌鲁木齐830011 [2]中国科学院广州地球化学研究所矿物学与成矿学重点实验室,广东广州510640 [3]中国科学院大学,北京100049 [4]广东省矿物物理与材料研究开发重点实验室,广东广州510640 [5]中国科学院地球化学研究所,矿床地球化学国家重点实验室,贵州贵阳550081

出　　处：《地球化学》2024年第5期719-733,I0001-I0009,共24页Geochimica

基　　金：国家自然科学基金项目(42230810、41725009、U1603244、41921003);国家重点研发项目(2022YFC2903301)联合资助。

摘　　要：随着浅表金属矿产资源的逐渐枯竭,深部隐伏矿体找矿勘查成为未来趋势,相应找矿勘查技术和方法的创新势在必行。近年来,短波红外(SWIR)光谱技术在全球典型斑岩–浅成低温热液矿床和矽卡岩型矿床的深部找矿勘查中发挥了重要作用,但目前主要是基于二维剖面的工作。EVS(earth volumetric studio)建模系统是应用于地球科学领域的3D建模软件,此软件基于数据驱动,具有数据可视化及模型动态更新的特点,可以满足地质建模的需求。本文利用EVS软件,对鄂东南矿集区铜绿山矽卡岩型Cu-Fe-Au矿床ⅩⅢ和ⅩⅣ号隐伏矿体不同蚀变矿物的空间分布、绿泥石和高岭石族矿物SWIR光谱特征参数的空间变化进行了三维可视化建模,探讨不同蚀变矿物和SWIR光谱参数与隐伏矿体之间的三维空间耦合关系;通过MATLAB原创程序计算含绿泥石SWIR光谱参数的样品点与深部矿化中心的三维最短距离,评价了SWIR光谱参数对深部热液矿化中心的精准指示潜力。结果表明,EVS软件三维建模在未来隐伏矿体勘查和预测中具有较大的应用潜力。With the gradual depletion of shallow surface mineral resources,deep prospecting and the prediction of blind ore bodies will become more important in the future;therefore,new techniques and methods of prospecting and exploration are urgently required.In recent years,shortwave infrared(SWIR)spectroscopy has played an important role in deep prospecting and exploration of typical porphyry-epithermal and skarn deposits around the world.Most of the work is based on two-dimensional profiles without systematic three-dimensional modeling,which greatly affects the three-dimensional visualization and accurate prediction of blind ore bodies.The EVS(earth volumetric studio)modeling system is a 3D modeling software widely applied in the field of earth science.This software is data-driven and has the characteristics of data visualization and dynamic update of models,and it can better meet the demands of 3D geological modeling.Here,we use the three-dimensional modeling function of EVS software and short-wave infrared spectral data to carry out 3D modeling on theⅩⅢandⅩⅣdeep ore bodies of the Tonglushan skarn copper-gold-iron deposit in the southeastern Hubei ore concentration area.Three-dimensional visualization modeling was carried out on the spatial distribution of the ore bodies,the different altered minerals,and the spatial variation of SWIR spectral parameters of chlorite and kaolinite group minerals.The 3D spatial coupling relationships between different altered minerals,the SWIR spectral parameters,and deep ore bodies are discussed.Furthermore,we calculated the three-dimensional shortest distance between the chlorite SWIR spectral parameter points and the deep mineralization center via MATLAB software and discussed the potential of SWIR spectral parameters for accurate prospecting.Our results highlight that the 3D modeling of the EVS software has great application potential for the exploration and prediction of blind ore bodies.

关 键 词：EVS三维建模 短波红外光谱 蚀变矿物 铜绿山Cu-Fe-Au矿床 鄂东南矿集区 

分 类 号：P612[天文地球—矿床学]