Abstract:In order to better delineate the geogas anomalies formed by the deep concealed uranium deposits on the surface, the trend surface analysis of the volcanic uranium ore field in the Xiangshan area of Jiangxi Province was carried out by appropriate polynomial fitting, and the geochemical elemental anomalies in the study area were delineated. Compared with the abnormal area delimited by the traditional averaging method. The trend surface method can be used to objectively fit the spatial distribution trend of the elements in the study area, and to define the local anomalies superimposed on the regional geochemical field. The application effect is obviously more ideal than the traditional average method, indicating that the trend surface method is for larger areas. The anomalous extraction of the ground gas has an advantage. The delineated anomaly corresponds well to the favorable prospect area of uranium mineralization in the spatial location, indicating that the trend surface method has certain significance for the geogas measurement to find deep uranium deposits. And, the U, Th, and Rb element anomalies delineated by the trend surface method correspond well with the favorable uranium mineralization position predicted by the comprehensive data of the research group, which indicates that the U, Th, and Rb elements can be regarded as good uranium ore indicators.