唐山断裂带南西段和北东段土壤气Rn和CO2浓度特征

Abstract

Abstract: We discussed the geochemical characteristics of soil gas Rn and CO₂ concentration and the correlation between the spatial variation of soil gas and tectonic activity, based on the measurements of Rn and CO₂ concentrations in the south-west (Wanglanzhuang) and north-east (Weifengshan) segments of the Tangshan fault zone. The results show that the concentration range of Rn in Wanglanzhuang and Weifengshan are respectively 691 to 57671 Bq/m³ and 471 to 32739 Bq/m³, while the concentration range of CO₂ are respectively 0.17 to 7.21% and 0.08 to 1.71%. The concentrations in these two profiles are higher than the regional background values, which may be caused by the open state of fault in the Tangshan area. The release intensity (K_Q) of soil gas in these two profiles is different. K_Q of Rn and CO₂ is 2.90 and 4.04 respectively in Wanglanzhuang Profile, and is 0.90、0.99 respectively in Weifengshan Profile. This illustrates that the concentration in the middle part of Weifengshan Profile is much higher than that at the both ends, while in Weifengshan Profile, the concentration of each part is consistent. The soil gas geochemical results show that the variations of soil gas spatial distribution may be attributed to the different degree of fault fragmentation in the profiles. The higher the regional stress, the higher the fault activity and the concentrations of Rn in Weifengshan Profile. This indicates that the concentration of Rn is closely related to the activity of faults.

Key words: Tangshan fault, Soil gas, Rn and CO2, Geochemistry, Active fault

CLC Number:

P315.7

YANG Jiang, LI Ying, CHEN Zhi, SUN Feng-xia, ZHAO Jian-ming, LI Jing, WANG Jiang. Geochemical Characteristics of Soil Gas in the South-west and North-east Segments of the Tangshan Fault Zone, Northern China[J]. EARTHQUAKE, 2019, 39(3): 61-70.

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Geochemical Characteristics of Soil Gas in the South-west and North-east Segments of the Tangshan Fault Zone, Northern China

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