衬度返回法在平抑地球化学系统偏倚中应用

摘要

During 1∶100000,1∶250000,1∶500000 or smaller-scale geochemical mapping,it is usually found that there ex-its system bias of geochemical data between different scales of maps of 1:50000 and 1:200000,or between different batches of data of same scale maps,as a result of difference in analyzing unit and work time. So,system bias must be resolved before mapping. System bias stabilizing methods include contrast variation method,compensation method,map-by-map standardization method,zoning standardization method,reference unit coefficient method,border limiting princi-ple,etc.,of which,based on work experiences and repeated experiments by the authors,the contrast return method is confirmed to be practical and effective in putting down system bias between different-scale maps or between different batches of data of same-scale maps.%　　在进行1∶10万、1∶25万、1∶50万或更小比例尺地球化学编图时，由于分析单位和工作时间不同，不同的1∶5万、1∶20万图幅间或同图幅不同批次间的化探数据常存在着系统偏倚。因此，编图前必须进行系统偏倚平抑。目前，系统偏倚平抑方法有衬度变换法、平差法、分幅标准化法、分区标准化法、基准单元系数法和边界极限原理法等。笔者在实际工作中，通过反复试验确认“衬度返回法”是图幅间或批次间系统偏倚平抑的一种实用且有效的方法。