几种变差函数在找矿实践中的应用比较——以甘肃北山地区红尖兵山金矿找矿为例  

COMPARISON OF SEVERAL VARIATIONAL FUNCTIONS IN MINERAL FINDING PRACTICE:AN EXAMPLE OF GOLD ORE SEARCHING AT HONGJIANBING MOUNTAIN IN BEISHAN AREA OF GANSU PROVINCE

作　　者：刘胜江 徐磊 王宇昊 张为 唐文轶 LIU Sheng-jiang;XU Lei;WANG Yu-hao;ZHANG Wei;TANG Wen-yi(Geological Survey of Gansu Province,Lanzhou 730000,China;School of Earth Sciences,Lanzhou University,Lanzhou 730000,China;College of Earth Science,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]甘肃省地质调查院,甘肃兰州730000 [2]兰州大学地质科学与矿产资源学院,甘肃兰州730000 [3]成都理工大学,四川成都610059

出　　处：《甘肃地质》2024年第2期43-51,共9页Gansu Geology

基　　金：甘肃省科技计划(22YF7GA050);陇原青年人才项目(2020RCXM152);甘肃省省级基础地质调查项目联合资助。

摘　　要：地球化学勘查是开展矿产勘查工作的常用手段之一。地球化学勘查数据一体化处理系统运用变差函数对原始地球化学数据进行网格化插值,将离散的点信息转换为连续的面信息,最终呈现为等值线图即地球化学图。本文以甘肃北山地区红尖兵山土壤地球化学测量Au元素数据为例,应用一体化系统提供的5种变差函数,制作了相应的Au元素地球化学图。旨在通过应用不同变差函数进行数据处理后,对其数据学指标如插值数量、平均值、标准离差、残差、均方根预测误差等进行定量比较,同时运用残差分析法验证其合理性,结合研究区金矿成矿规律和空间分布特征,探讨适合研究区地球化学勘查数据处理的变差函数模型。定量和定性对比一体化系统提供的5种变差函数,认为距离为幂的指数加权变差函数制作的Au元素地球化学图符合研究区金成矿地质条件和成矿规律,能有效地指导研究区金矿找矿工作。Geochemical survey is one of the common means to carry out mineral exploration work.In order to visualize the geochemical data obtained and guide the mineral exploration,an integrated geochemical survey data processing system(GeoChem Stuio 3.6.0,referred to as the integrated system)was developed by the previous generation.The integrated system applies the variational function to grid interpolation of the original geochemical data,converts the discrete point information into continuous surface information,and finally presents the contour map as the geochemical map.In this paper,we take the Au elemental data of soil geochemical measurements in Hongjianbing Mountain,Beishan District,Gansu Province as an example,and apply the five variance functions provided by the integrated system to produce the corresponding Au elemental geochemical maps.The purpose is to quantitatively compare the data processing of different variance functions with their datological indexes such as the number of interpolation,mean,standard deviation,residual,root mean square prediction error,etc.,and at the same time,to verify the reasonableness of the residual analysis,to explore the variance function model suitable for geochemical survey data processing of the study area by combining with the metallogenetic law and spatial distribution characteristics of the study area gold mines.After quantitatively and qualitatively comparing the five variance functions provided by the integrated system,it is believed that the Au elemental geochemical map produced by the exponentially weighted variance function with the distance as a power is in line with the geologic conditions of gold mineralization and the mineralization law in the study area,and can effectively guide the search for gold mines in the study area.

关 键 词：地球化学勘查 地球化学图 变差函数 残差分析 红尖兵山 

分 类 号：P632.1[天文地球—地质矿产勘探]