趋势面法提取相山地区地气异常及应用效果评价

为了更合理地圈出地下铀矿体在地表形成的地气异常,以江西省相山地区火山型铀矿田地气测量数据为例,使用趋势面分析方法,以合适阶次的多项式拟合地气元素的整体分布趋势,绘制异常分布图,与传统平均法圈定的异常区域进行对比。发现趋势面方法能够较客观地拟合研究区元素的空间分布趋势,圈定出叠加在区域地球化学场上的局部异常,应用效果明显较传统平均法更为理想,说明趋势面法对于较大区域的地气异常提取更具优势。圈定的异常在空间位置上与综合资料推测的铀成矿有利前景区域对应良好,表明趋势面方法在地气测量中的应用能为深部隐伏铀矿靶矿区的划分提供重要信息。同时趋势面法圈定的U、Th、Rb元素异常与课题组综合资料推测的铀成矿有利位置对应良好,表明U、Th、Rb元素可视为良好的铀矿指示元素。

Extraction of geogas anomalies in Xiangshan area by trend surface method and evaluation of application effects

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.