摘要
在地球化学找矿勘探中,稀有金属元素由于具有离散度小、亲合性密切的特征,导致其异常信息的提取难度较大,传统的化探异常信息提取方法存在不同程度的局限性,本文以近年来找矿工作取得重大突破的幕阜山地区为例,探讨提取稀有金属元素低弱异常信息的新方法。基于幕阜山地区陈家塅幅984个1∶5万水系沉积物化探数据,分析统计其中Li、Be、Nb、Ta元素地球化学参数特征,认为四种元素均富集不明显,属于低弱异常。采用含量排列法与趋势面结合对数据处理过程进行优化,即对原始数据拟合二次曲面次数的趋势面,再对原始数据与趋势面的残差运用含量排列法提取异常。相对比于含量排列法及迭代法,优化后的方法提取效果更佳,减弱了元素高背景区域大面积异常,强化了低背景区异常。优化后的方法更能有效提取稀有金属元素低弱异常信息。
In geochemical mineral exploration,it is difficult to extract anomalous information of rare matal elements as their characteristics of low dispersion and close affinity,and their are limintations of varying degrees in traditional methods for anomalous information extraction.This article takes the Mufushan area,which has made significant breakthroughs in mineral exploration work in recent years,as an example to explore a new method for extracting low and weak anomalous information of rare metal elements.Based on a total of 984 samples of 1:50,000 stream sediments in the Chenjiaduan Unit in the Mufushan area,this study analyzed the geochemical parameter characteristics of elements Li,Be,Nb,and Ta,and determined that the enrichment of these four elements was not obvious and they were belonged to weak anomalies.Based on methods of content arrangement and trend surface,this study optimized the data processing process.It fits a quadratic trend surface to the original data,and then uses the content arrangement method to extract anomalies of residuals between the original data and the trend surface.Compared with the content arrangement and iterative methods,the optimized method is much better to extract weak geochemical anomalies of rare metal elements.It reduced large-area anomalies in high-background areas of elements and strengthened anomalies in low-background areas.The optimized method is more effective for extracting low and weak anomaly information of rare metal elements.
作者
冯佳鑫
李艳军
冷双梁
杨紫文
卢亚鑫
FENG Jia-Xin;LI Yan-Jun;LENG Shuang-Liang;YANG Zi-Wen;LU Ya-Xin(School of Earth Resources,China University of Geosciences(Wuhan),Wuhan 430074,Hubei,China;Hubei Geological Survey,Wuhan 430034,Hubei,China;Hubei Geological Exploration Engineering Technology Research Center,Wuhan 430034,Hubei,China)
出处
《华南地质》
2025年第3期558-570,共13页
South China Geology
基金
湖北省地质局项目(KJ2022-48)
中国地质大学(武汉)资源学院2023年度“寻找李四光”专项基金资助计划。
