基于地球化学背景的多图幅系统误差校正——以区域地球化学调查数据Au元素为例

Multi-map Systematic Error Correction Method Based on Geochemical Background:A Case Study on Gold of Regional Geochemical Survey

针对区域地球化学图件中出现的含量等值线环绕子区边界现象,以Au的多个图幅拼接为例,使用了分幅标准化法、衬度返回法及定和化法3种方法对地质大调查以来新方法获得的某成矿带区域地球化学数据进行系统误差校正,校正后编制地球化学等量线图显示,所采用的3种校正方法对于研究区数据存在的系统误差都不能达到较好的调平效果。针对研究区数据特点,尝试在分幅标准化法和衬度返回法基础上提出基于地球化学背景的误差校正方法,进一步对4种方法校正后数据参数特征及编制地球化学等量线图进行对比。基于地球化学背景的误差校正方法对研究区达到了较好的数据校正效果,并对校正前后数据进行相关对比和检验,满足化探数据中存在的系统误差属于线性误差这一基本假设,在实际应用中,可供地球化学数据系统误差校正灵活地使用,以取得更好的应用效果。

To eliminate the phenomenon that content contour often circles the subregion in geochemical maps,the authors took the gold geochemical map as an example and used the division standardized method,the contrast deduction and the addition method to revise the systematic error of the regional geochemical data of the Greater Khingan Mountains metallogenic belt obtained by the new method since the geological survey,with a comparative study of the application effects. The result shows that the three methods couldn＇t be applied to revising the systematic error between the analytical data of several different sections. According to the data characteristics of the study area,the geochemical background systematic error correction method is put forward based on the data division standardized method and the contrast deduction,and the four methods were compared with each other for their application effects through the data parameters,characteristics and geochemical contour maps. This means can effectively remove the systematic errors in maps-merging,and the revised data can meet the basic assumption that the systematic error in geochemical data belongs to linear error. In practical application,this method can be flexibly used for systematic error correction of chemical data so as to get better effect.