摘要
针对化探背景异常划分问题,在考虑岩性背景、随机误差与结构异常关系基础上,提出了多背景变差衬度法。该方法是对研究区样品按地质背景分类求背景上限,再针对每一个样品,利用其临近同类样品元素含量和所属类别的背景上限值求变差衬度值,从而获得单个样品的异常相对强度,实现消除岩性影响,突出低弱异常的目的。研究区实例的处理结果表明,这种新方法适用于岩性复杂地区异常受岩性影响严重的元素的背景异常划分。方法的特点是符合地质理论、计算相对简单、异常结果清晰。
Aiming at the problem of anomaly division in regional geochemistry,the method of contrast of variation coefficient is presented based on the consideration of lithological background,random error and structural anomalism in this paper.First,all samples in study area were classified to divide their geological background,and the upper limit of the geochemical background in each classification is obtained.Then,for each sample,the value of contrast of variation coefficient is calculated by the element content value nearby each other,the upper limit value of the class.The calculated results can eliminate the influence of lithology and highlight low and weak anomalies.We also carried out the calculus in an example to demonstrate its effectiveness.The results show that this method is suitable for complex lithology areas and elements affected by lithology seriously.The advantages of the method are more in line with geological theory,more foolproof calculations and more clearly abnormal map.
作者
赵玉岩
李兵
郝立波
陆继龙
赵禹
孙立吉
王晓丽
ZHAO Yuyan;LI Bing;HAO Libo;LU Jilong;ZHAO Yu;SUN Liji;WANG Xiaoli(Jilin University,a.College of Geo-Exploration Science and Technology,,Changchun 130026,Chin;Jilin University,Editorial Department of Jilin University Journal,Changchun 130026,China;Xi'an Institute of Geology and Mineral Resources,China Geological Survey,Xi'an 710054,China;Hunan Land&Resources Information Center,Changsha 410007,China)
出处
《物探化探计算技术》
CAS
CSCD
2018年第2期235-240,共6页
Computing Techniques For Geophysical and Geochemical Exploration
基金
吉林大学优秀青年教师培养计划(419080500564)
国土资源部行业专项(SinoProbe04-05-02)
关键词
化探
多背景
背景上限
变差衬度
geochemical exploration
multi-background
upper limit of geochemical background
contrast of variation coefficient
