郯庐断裂带新沂——泗洪段土壤气Rn体积活度和CO_2浓度特征研究  

Geochemical Characteristics of Soil Gases Rn,CO_2 in Xinyi-Sihong Segment of Tanlu Fault

作　　者：缪阿丽[1] 张扬[1] 方震[2] 李锋[1] 王维[1] 高力 MIAO A-li;ZHANG Yang;FANG Zhen;LI Feng;WANG Wei;GAO Li(Jiangsu Earthquake Administration,Nanjing,210014,China;Anhui Earthquake Administration, Hefei,23003,China;Haian Seismic station of Jiangsu Province,Haian,226600,China)

机构地区：[1]江苏省地震局,江苏南京210014 [2]安徽省地震局,安徽合肥230031 [3]江苏省海安地震台,江苏南通226600

出　　处：《地震》2019年第1期48-57,共10页Earthquake

基　　金：中国地震局震情跟踪面上课题(2018020303);地震监测预报专项(1770505);地震动力学国家重点实验室开放基金课题(LED2013B04)资助

摘　　要：郯庐断裂带江苏段地区4个剖面进行了土壤气Rn体积活度和CO_2浓度测量结果显示,自北向南土壤气Rn体积活度均值分别为22.9kBq/m^3、35.5kBq/m^3、40.2kBq/m^3、26.6kBq/m^3;自北向南土壤气CO_2浓度均值分别为0.669%、0.400%、0.503%、1.109%。土壤气Rn体积活度和CO_2的浓度在空间分布上具有较好的一致性,这可能与CO_2是Rn的载气有关。综合分析土壤气Rn和CO_2测量结果以及水准资料可得,2017年土壤气Rn高值出现在晓店段可能与区域应力应变调整有关。本研究不仅为研究区以后的土壤气研究提供了参考,同时也可为研究区的构造活动研究提供地球化学资料参考。Concentrations of soil gases Rn and CO2 were measured at 4profiles in Jiangsu segment of Tanlu fault,the results show that the average concentrations of Rn observed at the four profiles are 22.9kBq/m^3,35.5kBq/m^3,40.2kBq/m^3 and 26.6kBq/m^3,and the average concentrations of CO2 are 0.669%,0.400%,0.503% and 1.109% respectively.The concentration of soil gases Rn and CO2 in the study area has a good consistency with the spatial distribution,which may be related to the fact that CO2 is the carrier gas of Rn.A comprehensive analysis of soil gases Rn,CO2 and the leveling data,indicated that the highest Rn concentration observed in Xiaodian section,which may be related to the adjustment of regional stress-strain.The results not only provide a reference for soil gas research,but also provide a reference of geochemical data for tectonic activities research in the study area.

关 键 词：土壤气 地球化学 背景场 郯庐断裂带 

分 类 号：P315.7[天文地球—地震学]