GPD在地球化学元素异常识别中的应用  

The study of GPD in recognition of geochemical element anomaly

作　　者：秦飞龙 刘剑[2] 颜文勇[1] 周仲礼[3] 龚灏[3] 郭科[3] QIN Feilong;LIU Jian;YAN Wenyong;ZHOU Zhongli;GONG Hao;GUO Ke(School of Big Data and Artificial Intelligence,Chengdu Technological College,Chengdu 611730,China;School of Automobile and Communications,Chengdu Technological College,Chengdu 611730,China;Sichuan Key Laboratory of Mathematical Geology,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]成都工业学院大数据与人工智能学院,成都611730 [2]成都工业学院汽车与交通学院,成都611730 [3]成都理工大学数学地质四川省重点实验室,成都610059

出　　处：《成都理工大学学报（自然科学版）》2020年第3期374-384,共11页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家自然科学基金项目(41272363);数学地质四川省重点实验室开放基金项目(scsxdz2018yb03);四川省科技厅计划项目(2019YJ0375);成都工业学院博士基金项目(2018RC022)。

摘　　要：根据地球化学元素异常含量分布规律和极值理论(EVT)的广义帕累托分布(GPD)规律具有一致性,采用GPD分布建立了地球化学元素含量异常提取模型,并对模型中的尺度参数、形状参数以及阈值估计方法进行了选取和探讨,研究地球化学元素含量异常分布规律及其找矿标志。在此基础上设计了一种修正阈值函数法。将构建的异常提取方法应用于湖北鸡冠咀铜金矿区地球化学元素含量异常提取,结果显示构建的模型能够有效提取地球化学元素含量异常值,所提取的元素含量异常区域与实际矿体分布趋势一致,得出地球化学找矿标志,圈定出新的找矿靶区。According to the consistency of geochemical element anomaly concentration distribution and extreme value theory(EVT)generalized Pareto distribution(GDP)law,ageochemical element anomaly extraction model is established through GDP distribution.The scale parameter,shape parameters and threshold estimation method involved in the model are selected and discussed so as to study the abnormal distribution regularity of geochemical elements and its prospecting marks.In the model,a modified threshold function method is designed and the parameters of the model are estimated and proved theoretically.The proposed GPD model of the geological anomaly is used to identify anomalies in the Jiguanzui Cu-Au mining area in the Hubei Province.The results show that the new model can effectively extract the abnormal values of geochemical elements in the study area and the determined anomaly region is consistent with the range of ore bodies of actual engineering exploration.Therefore,the prospecting criteria of geochemical elements can be obtained and the optimal prospecting target area can be determined.

关 键 词：地球化学异常 矿产资源 GPD 

分 类 号：P628[天文地球—地质矿产勘探]