森林沼泽覆盖区化探异常提取方法研究——以内蒙古三七林场幅为例  

Study on extraction method of geochemical anomaly in forest swamp covered area:a case study of Sanqi tree farm in Inner Mongolia

作　　者：张诗敏 李随民 周吉晨 焦建 Zhang Shimin;Li Suimin;Zhou Jichen;Jiao Jian(Shanxi geological engineering exploration Institute Co.,Ltd.,Taiyuan,Shanxi,030024,China;Hebei GEO University,Shijiazhuang,Hebei,050031,China;Zhejiang Jiuhe geological ecological environment planning and design Co.,Ltd.,Huzhou,Zhejiang,313000,China;The No.2 comprehensive geophysical prospecting brigade Shanxi geological mining Co.,Ltd.,Xi’an,Shanxi,710003,China)

机构地区：[1]山西省地质工程勘察院有限公司,山西太原030024 [2]河北地质大学,河北石家庄050031 [3]浙江久核地质生态环境规划设计有限公司,浙江湖州313000 [4]陕西地矿第二综合物探大队有限公司,陕西西安710003

出　　处：《化工矿产地质》2023年第2期188-192,共5页Geology of Chemical Minerals

基　　金：河北地质大学学生科技基金项目康保县北沙城矿致异常识别及应用(编号:KAG202106)。

摘　　要：为强化和提取覆盖区低弱地球化学异常的识别,本文通过K均值聚类法对呼伦贝尔市三七林场1∶5万化探数据进行了分析。根据内蒙古自治区呼伦贝尔市三七林场1∶5万地质图中出现的地质单元数目和K均值聚类的轮廓系数,可以将该地区分为五大类,以Au、Cu元素为例,异常值采用3S法剔除,然后计算平均值、标准差、异常下限值、衬度值,绘制等值线图。通过等值线图可知,分类后圈定的Au、Cu异常与传统方法圈定的异常范围差别较大,通过K均值聚类法有效消除了岩性对地球化学背景值的影响。In order to strengthen and extract the low and weak geochemical anomalies in the coverage area,this paper uses the K-mean clustering method to analyze the 1∶50000 geochemical data of Sanqi tree farm in Hulunbuir.According to the number of geological units and K-mean clustering silhouette Coefficient we got in this area,the area can be divided into five categories.Taking Au and Cu elements as examples,3S method is used to eliminate abnormal values,then we calculate mean value,standard deviation,abnormal lower limit value and contrast value,and draw contour map.According to the contour map,the Au and Cu anomalies delineated by classification are quite different from those delineated by traditional methods,and the influence of lithology on geochemical background value is effectively eliminated by K-means clustering method.

关 键 词：K均值聚类法 低弱地球化学异常 内蒙古三七林场 

分 类 号：P596[天文地球—地球化学]