活断层上覆盖层中土壤氡浓度分布的数值模拟  

Numerical simulation of the soil radon concentration distribution in the overburden above active faults

作　　者：刘菁华[1] 王祝文[1] 

机构地区：[1]吉林大学地球探测科学与技术学院,长春130026

出　　处：《地球物理学进展》2009年第2期644-650,共7页Progress in Geophysics

基　　金：四川省地学核技术重点实验室开放基金(27-3);吉林大学种子基金(498042300423)资助

摘　　要：本文利用实测地质剖面建立了活断层上覆盖层中氡迁移的地质一物理模型,根据氡的迁移机理建立了活断层上氡迁移的数学模型,采用有限差分方法求解氡迁移的二维微分方程的数值解,得到了直立活断层,倾斜活断层,地堑活断层,活动断裂带或破碎带上覆盖层中氡浓度的二维断面等值图和横切断层的剖面曲线,分析了氡浓度分布的二维断面特征和剖面曲线特征,它们与氡的迁移机制及活断层调查的实测剖面曲线相符,这些为活断层的调查和进一步反演奠定了理论基础.Based on the field measurement profile this paper established a geological-physical model and proposed a mathematic model for radon migration in the overburden above active faults. The finite difference method was used to get the numerical resolution for the 2-D differential equation of the radon migration. Based on the results, this paper got several kinds of profiles crossing faults and 2-D section contour diagrams of radon concentration distribution in the overburden above the faults such as steep, dipping and graben faults and fracture zones. The profile and 2-D sections characteristics of the radon concentration distributions were analyzed. These results get from the models based on the radon migration mechanism agree well with the field measurement profiles from active fault investigations. And these conclusions can provide the theoretical basis for the active fault investigation and further mathematic inversion.

关 键 词：活断层 覆盖层 氡浓度 分布特征 数值模拟 

分 类 号：P631[天文地球—地质矿产勘探]