江西省古塘地区化探数据异常下限确定方法的对比研究  

Comparative Study on Methods for Determining the Lower Limit of Anomaly in Geochemical Exploration Data in Gutang Area,Jiangxi Province

作　　者：卓海军 揭伟成 ZHUO Hai-jun;JIE Wei-cheng(Nuclear Geology Brigade of Jiangxi Geological Bureau,Nanchang 330002,China)

机构地区：[1]江西省地质局核地质大队,江西南昌330002

出　　处：《世界有色金属》2024年第13期163-165,共3页World Nonferrous Metals

基　　金：《江西省乐安县古塘锡多金属矿调查评价》项目资助(项目编号:20200017)。

摘　　要：在土壤地球化学解异工作中,如何厘定异常下限值是评价地球化学异常的重要基础,现阶段界定异常下限的方法较多,本文将采用传统的均值标准法、累计频率法、和多重分形方法(C-N)分别应用在江西省古塘地区土壤地球化学异常下限的确定,并对不同方法确定的元素异常范围进行比较,讨论不同模型的优缺性。根据研究结果显示,累计频率法在圈定异常图范围时显示出明显的浓集中心和分带现象,却容易遗漏一些弱异常等重要信息。另外,含量-频率法则确定的异常下限略低于累计频率法,导致异常范围过大,加大了异常查证工作难度。因此界定异常下限值,从元素数据分布情况角度匹配不同方法,从缩小化探异常范围开始提高找矿效率。In the process of soil geochemical anomaly resolution,determining the lower limit of anomalies is an important basis for evaluating geochemical anomalies.Currently,there are many methods to define the lower limit of anomalies.This article will use traditional mean standard method,cumulative frequency method,and multifractal method(C-N)to determine the lower limit of soil geochemical anomalies in the Gutang area of Jiangxi Province.The range of element anomalies determined by different methods will be compared,and the advantages and disadvantages of different models will be discussed.According to research results,the cumulative frequency method shows obvious concentration centers and zoning phenomena when delineating the range of anomaly maps,but it is prone to missing important information such as weak anomalies.In addition,the lower limit of anomalies determined by the content frequency method is slightly lower than that determined by the cumulative frequency method,resulting in an excessively large range of anomalies and increasing the difficulty of anomaly verification work.Therefore,defining the lower limit value of anomalies,matching different methods from the perspective of element data distribution,and starting from reducing the range of geochemical anomalies to improve the efficiency of mineral exploration.

关 键 词：土壤地球化学 异常下限 均值标准法 多重分形法 85%累积频率法 

分 类 号：P632[天文地球—地质矿产勘探]