多背景下异常衬值法在地球化学异常信息提取中的应用——以黑龙江多宝山地区为例  

The application of anomaly contrast to extracting geochemical anomaly information:A study of Duobaoshan area in Heilongjiang Province

作　　者：陈亮[1,2] 王惠艳 孙诚业[1,2] CHEN Liang;WANG Hui-Yan;SUN Cheng-Ye(Institute of Geophysical and Geochemical Exploration,CAGS,Langfang 065000,China;State Research Center of Modern Geological Exploration Engineering Technology,Langfang 065000,China)

机构地区：[1]中国地质科学院地球物理地球化学勘查研究所,河北廊坊065000 [2]国家现代地质勘查工程技术研究中心,河北廊坊065000

出　　处：《物探与化探》2018年第6期1150-1155,共6页Geophysical and Geochemical Exploration

基　　金：中国地质调查局项目"黑龙江多宝山地区矿产远景调查"(1212010781025)

摘　　要：大面积土壤地球化学测量中,通常不仅在不同地质单元下的地球化学背景存在差异(即多背景),不同图幅之间由于采样方法和样品处理分析方法的差异也使得化探数据存在系统偏差。笔者对黑龙江多宝山地区不同图幅化探数据调平后,按不同地质单元进行子区划分,将各子区土壤测量数据进行了归一化处理,即利用异常下限值计算不同子区各采样点元素的异常衬度,利用异常衬度值圈定土壤测量单元素异常,同时利用采样点元素的异常衬度,对其进行规格化处理,进行综合异常信息提取。地球化学异常图显示,该方法与常规的处理方法相比,既能有效缩小背景差异,又不因调平出现假异常。通过对遴选的综合异常进行异常查证,在后期的勘查中发现多处金矿体,证明了该方法提取异常信息的有效性。In large-area soil geochemical survey,different geological units have different geochemical backgrounds,forming multiple backgrounds.Geochemical data from different map sheets exhibit deviation caused by sampling methods or analytical methods.This paper aims at leveling the geochemical data from Duobaoshan area of Heilongjiang Province,dividing different geological units into subareas,making normalization processing for data of different subarea,then calculating anomaly contrast based on sampling sites and acquiring element anomalies.In addition,,specification processing can be made for anomaly contrast,and comprehensive anomaly information can be extracted.The above method can effectively reduce background differences and avoid false anomaly.Finally,many gold orebodies were found in the later exploration by the anomaly inspection of certain comprehensive anomalies,which can prove the effectiveness of this method in extracting abnormal information.

关 键 词：多背景 异常衬度法 单元素异常 综合异常 

分 类 号：P632[天文地球—地质矿产勘探]