首都圈地区土壤气Rn,Hg,CO_2地球化学特征及其成因
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摘要
对首都圈地区跨18条活动断裂的35条剖面进行了土壤气浓度和通量测量,结果显示:各测量剖面土壤气Rn,Hg和CO2的浓度平均值分别为3.2—45.0kBq/m~3,3.9—24.9ng/m~3和0.154%—2.175%;其通量平均值分别为3.8—152.1 mBq/(m~2·s),0.1—42.6ng/(m~2·h)和8.5—89.4g/(m~2·d).研究区土壤气Rn,Hg和CO_2的浓度和通量均呈东高西低的变化趋势,与首都圈地区由西至东应力水平增高、地壳厚度逐渐减薄、沉积层厚度增大、地震活动逐渐增强等趋势相对应,这表明首都圈地区土壤气的区域地球化学特征主要受控于上地壳物质结构、深部气体补给和地震活动,同时也受到自然环境及土壤类型的影响.
The concentration and flux of soil gases were measured at 35 profiles across 18 faults in the capital area of China from June to July of 2015,and the geochemical characteristics and sources of soil gases Rn,Hg and CO_2 in the areawere also investigated.The results showed that the average concentrations of Rn,Hg and CO_2 varied from 3.2to 45.0kBq/m3,3.9to 24.9ng/m3 and0.154%to 2.175%,respectively.The average flux values of Rn,Hg and CO_2 ranged from 3.8to 152.1 mBq/(m2·s),0.1to 42.6ng/(m2·h)and 8.5to89.4g/(m2·d),respectively.There is an obvious spatial distribution feature of soil gases that both the concentration and flux values in the eastern region were higher than those in the western region within the studied area,which could be attributed to the increased tectonic stress,the decreased crustal thickness,the increased thickness of sediments and earthquake activity from west to east.These spatial geochemical characteristics in the studied area might be mainly controlled by the upper crustal material structure,deep gas supply and seismic activity,and also additionally affected to some degree by the natural environment and soil types.
The concentration and flux of soil gases were measured at 35 profiles across 18 faults in the capital area of China from June to July of 2015,and the geochemical characteristics and sources of soil gases Rn,Hg and CO_2 in the areawere also investigated.The results showed that the average concentrations of Rn,Hg and CO_2 varied from 3.2to 45.0kBq/m3,3.9to 24.9ng/m3 and0.154%to 2.175%,respectively.The average flux values of Rn,Hg and CO_2 ranged from 3.8to 152.1 mBq/(m2·s),0.1to 42.6ng/(m2·h)and 8.5to89.4g/(m2·d),respectively.There is an obvious spatial distribution feature of soil gases that both the concentration and flux values in the eastern region were higher than those in the western region within the studied area,which could be attributed to the increased tectonic stress,the decreased crustal thickness,the increased thickness of sediments and earthquake activity from west to east.These spatial geochemical characteristics in the studied area might be mainly controlled by the upper crustal material structure,deep gas supply and seismic activity,and also additionally affected to some degree by the natural environment and soil types.
引文
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