Geochemical characteristics of soil gas in the Yanhuai basin,northern China

作     者：Ying Li Jianguo Du Fukuan Wang Xiaocheng Zhou Xiaodong Pan Ruqing Wei 

作者机构：Institute of Earthquake Science China Earthquake Administration Beijing 100036 China Inner Mongolia Corporation Ltd. of Geologic Engineering Hohhot 010051 China Earthquake Administration of Jilin Province Changchun 130022 China Liaocheng Seismology Hydro-chemistry Test Station Liaocheng 252000 China 

出 版 物：《Earthquake Science》 (地震学报（英文版）)

年 卷 期：2009年第22卷第1期

页      面：93-100页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 0808[工学-电气工程] 07[理学] 080803[工学-高电压与绝缘技术] 08[工学] 070801[理学-固体地球物理学] 0707[理学-海洋科学] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0815[工学-水利工程] 0816[工学-测绘科学与技术] 0813[工学-建筑学] 0814[工学-土木工程] 0825[工学-航空宇航科学与技术] 0704[理学-天文学] 

基　　金：supported by Science Fund of Institute of Earthquake Science,China Earthquake Administration (02076902-32) Joint Seis-mological Science Foundation of China (B07002) National Natural Science Foundation of China (40703013) 

主　　题：soil gas geochemistry fault activity Yanhuai basin 

摘      要：The geochemical backgrounds and origins of soil gases in the Yanhuai basin are discussed based on the regional seismogeological data and concentrations of Rn, Hg, CO2, H2, He and CH4 in soil gas measured at 422 investigating sites in field during September to October 2007. The geochemical background values of Rn, Hg, CO2, H2, He and CH4 are （8105.8±5937.4） Bq/m^3, （9.7±5.8） ng/m^3, （395.9±35.3）×10^-6, （4.0±2.3）×10^-6, （15.9±10.4）×10^-6 and （12.7±8.1）×10^-6, respectively. The geochemical backgrounds of the soil gases are higher in the eastern part of the Yanhuai basin. The main factors affecting the gasgeochemical backgrounds are gaseous origins, structure of the crust, faults, straaun and microbe activity. The higher values of gasgeochemical backgrounds in the eastern part are attributed to the existence of low-velocity zones in the upper crust, stronger tectonic activity and more contributions of Hg and He derived from the deep-earth and Rn origi- nated from granite, corresponding to stronger seismic activity. The results can be applied to identifying seismic precursor from monitoring data of gases in the studied area.