六盘山东麓断裂带逸出气氡浓度特征分析

Characteristic Analysis of Escape Gas Radon Concentration from theEastern Liupanshan Piedmont Fault Zone

摘要:

在六盘山东麓断裂带布设8条测量剖面，现场测量了土壤气Rn浓度及通量，来讨论六盘山东麓断裂带逸出气氡浓度特征及其与构造活动性间关系。测量结果表明：8个测区测量的气Rn浓度平均值在23.88~66.34 kBq间，通量在2 194~14 091 Bqm^-3s^-1间。断裂带土壤气Rn浓度平均值在空间分布上，自北向南逐渐增大，由44.61 kBq升高至66.34 kBq，到断裂带南段西贤村、刘店村两个剖面Rn浓度平均值减小，这可能是由空间上断裂活动性差异引起的。

Abstract:

In this paper, concentration characteristics of escaping radon and its relationship with tectonic activity from the Eastern Liupanshan Piedmont Fault Zone have been discussed. 8 measuring sections were laid in the Eastern Liupanshan Piedmont Fault Zon, radon concentration and flux of soil gas were measured in the field. The measurement results show that:The average value of the soil gas radon concentration is between 23.88 kBq to 66.34 kBq and the flux is between 2 194 Bqm^-3s^-1 to 14 091 Bqm^-3s^-1 in the 8 test areas. The mean value of soil gas Rn concentration in the fault zone in spatial distribution is gradually increased From north to south by 44.61 kBq increased to 66.34 kBq,but the average radon concentration decreased in Xixian Village and Liudian Village which located in the southern section of the fault zone. This may be caused by the difference in the activity of the faults in the space.