地质与资源2026，Vol.35Issue(3)：282-291,10.DOI:10.13686/j.cnki.dzyzy.2026.03.005
复杂地质背景下异常衬度值法在异常信息提取中的应用
Application of contrast value method in anomaly information extraction under complex geological backgrounds:A case study of Dachebeigou area,Jilin Province
摘要
Abstract
In Dachebeigou area of Jilin Province,the geochemical field varies significantly across different geological backgrounds.Consequently,using a unified anomaly threshold to delineate anomalies across the entire area in geochemical data processing yields poor mapping results.Based on the distribution characteristics of the geochemical field in the study area,integrated with the geological background,geological subareas were first divided.Subsequently,the anomaly thresholds of elements at sampling points within different subareas were used to calculate anomaly contrast values,and single-element anomalies were delineated accordingly.Taking Nb as an example,the anomalies delineated by this method not only solve the problem of undetected anomalies in low-background and low-field areas but also prevent the problem of excessively large anomalies in high-background and high-field areas.The results align well with the geological background and effectively reflect the known mineral occurrences.During the verification of key anomalies,new mineralization clues were discovered,confirming the effectiveness of the contrast value method in extracting anomaly information under complex geological backgrounds.关键词
水系沉积物测量/地球化学场/异常下限/异常衬度值/铌矿/吉林省Key words
stream sediment survey/geochemical field/anomaly threshold/contrast value/niobium deposit/Jilin Province分类
天文与地球科学引用本文复制引用
时林,任龙,王存柱,张彬,刘长纯,王春晖,许帅农,陈健..复杂地质背景下异常衬度值法在异常信息提取中的应用[J].地质与资源,2026,35(3):282-291,10.基金项目
中国地质调查局地质调查项目"吉林那尔轰一带金铜多金属找矿靶区优选与评价"(DD20230371) （DD20230371）
"吉林大车背沟等8幅1∶5万矿产地质调查"(DD20208010). （DD20208010）
