1.Hebei Key Laboratory of Strategic Critical Mineral Resources, Hebei GEO University;2.Sino-Zijin Resources L td.;3.Institute of Geographical Sciences, Hebei Academy of Sciences;4.Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences;5.Hebei Center for Ecological and Environmental Geology Research
研究目的：查明承德地区土壤硒的分布特征及地质成因，为当地土壤硒的勘查及有效利用提供科学依据。研究方法：通过地质调查查明该区成土母质类型，利用X-射线荧光光谱法、电感耦合等离子体发射光谱法、凯氏定氮法等获取了553个土壤样品及66件岩矿石样品中硒及多个元素的含量，并利用SPSS软件分析数据，结合地质作用分析地质成因。研究结果：研究区成土母质大致分为九类，表层土壤中硒含量最小值为0.016 mg/kg，最大值为0.743mg/kg，平均值为0.17 mg/kg，土壤平均硒含量仅为全国土壤平均硒含量的1/2，处于缺乏等级。铁矿石、金矿石、铅锌矿石中硒含量均值分别为0.860、1.233、3.365 mg/kg，明显高于各类矿石的尾矿及围岩。结论：承德地区土壤硒整体含量很低，主要决定于成土母质，分布特征受控于地质建造。富硒土壤区域集中在隆化县南部（A区）、承德市南部（B区）（双滦区、双桥区）、宽城县东部（C区）。C区属于“岩石风化型”，与含硒量高的原生碳酸盐岩+炭质泥岩地层组合有关；B区属于“成矿伴生型”，与铅锌矿成矿过程中硒与金属硫化物的伴生关系及硒与硫的替代关系有关；A区属于“河道沉积型”，与河道沉积过程中河湖冲动力驱动、有机质的吸附作用有关。承德南部富硒区域具有发展林果经济的天然优势，围场县处于低硒环境，是引发克山病等地方病流行的因素之一。
Objective：To find out the distribution characteristics and geological genesis of soil selenium in Chengde area, so as to provide scientific basis for the exploration and effective utilization of local soil selenium. Method: The types of soil parent materials in this area were identified by geological survey. The contents of selenium and multiple elements in 553 soil samples and 66 rock/ore samples were obtained by X-ray fluorescence spectrometry, inductively coupled plasma emission spectrometry and Kjeldahl nitrogen. The data were analyzed by SPSS software and the geological genesis was analyzed combined with geological process. Results: the soil parent materials in Chengde area are roughly divided into nine categories. The minimum value of selenium content in surface soil is 0.016 mg/kg, the maximum value is 0.743 mg/kg, and the average value is 0.17 mg/kg. The average soil selenium content is only 1 / 2 of the national average selenium content, which is in a lack level. The average selenium contents in iron ore, gold ore and lead-zinc ore were 0.860, 1.233 and 3.365 mg/kg, respectively, which were significantly higher than those in tailings and surrounding rocks of various ores. Conclusions: The overall content of soil selenium in Chengde is very low, which is mainly determined by the parent material, and its distribution characteristics are controlled by geological formation. Selenium-rich soil areas are concentrated in the south of Longhua County ( Area A ), the south of Chengde City ( Area B ) ( Shuangluan District, Shuangqiao District) and the eastern Kuancheng County ( Area C ). Area C belongs to the "rock weathering type", which is related to the combination of primary carbonate rock and carbonaceous mudstone with high selenium content. Area B belongs to " mineralization associated type ", which is related to the associated relationship between selenium and metal sulfide and the substitution relationship between selenium and sulfur in the process of lead-zinc mineralization. Area A belongs to the " river sedimentary type ", which is related to the driving force of rivers and lakes and the adsorption of organic matter in the process of channel deposition. The selenium-rich region in southern Chengde has the natural advantage of developing forest and fruit economy. Weichang County is in a low selenium environment, which is one of the factors leading to the epidemic of Keshan disease and other local diseases.