趋势面法提取相山地区地气异常及应用效果评价  

Application of Trend Surface Analysis to Delineating Geogas Anomalies in Xianshang Area and Its Effect

作　　者：王帅帅 罗齐彬 杨亚新[2] 符志军 洪昆 吴信民 李星阳 WANG Shuai-shuai;LUO Qi-bin;YANG Ya-xin;FU Zhi-jun;HONG Kun;WU Xin-min;LI Xing-yang(College of Nuclear Science and Engineering,East China University of Technology,Nanchang 330013,China;National Key Laboratory for Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China)

机构地区：[1]东华理工大学地球物理与测控技术学院,南昌330013 [2]东华理工大学核资源与环境国家重点实验室,南昌330013

出　　处：《科学技术与工程》2020年第13期5058-5065,共8页Science Technology and Engineering

基　　金：国家科技部重点研发计划项目(2017YFCO602600);国家自然科学基金(41774134)。

摘　　要：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。To delineate the abnormal formation of underground uranium deposits on the surface more reasonable,with geogas prospecting data of volcanic uranium mine in Xiangshan area of Jiangxi Province were taken as an example to perform the trend surface analysis.Appropriate orders of polynomial were employed to fit the overall distribution trend of geochemical elements,to draw the anomaly distribution map,to compare the traditional average method,and finally to delineate the abnormal regions in the study areas.It was found that the trend surface method could fit objectively the spatial distribution trend of the elements,and delineate the local anomalies that superimposed on the regional geochemical field.The results of trend surface method were obviously better than that of traditional average methods,indicating that the trend surface method was more advantageous for the extraction of geogas prospecting anomalies in a large area.The spatial position with delineated anomalies correspond well with the favorable prospects of uranium mineralization predicted by comprehensive data,showing that the application of trend surface method in geogas prospecting could provide important information for the classification of deep concealed uranium target areas.At the same time,the anomalies of U,Th,and Rb defined by trend surface method corresponded well with the uranium metallogenic vantage points speculated by the comprehensive data of the research group,indicating that U,Th,and Rb can be regarded as good indicator elements of uranium ore existence.

关 键 词：地气异常 趋势面分析 传统平均法 铀矿勘探 

分 类 号：P632[天文地球—地质矿产勘探]