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[1]LIU Jie,LI Ying,CHEN Zhi,et al.Geochemical Characteristics and Genesis of Soil Gas CO2 in the Longxian-Baoji Fault Zone[J].Journal of Seismological Research,2022,45(02):217-228.[doi:10.20015/j.cnki.ISSN1000-0666.2022.0020]

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Geochemical Characteristics and Genesis of Soil Gas CO₂ in the Longxian-Baoji Fault Zone

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 45 Number of periods: 2022 02 Page number: 217-228 Column: Public date: 2022-05-20

Title:: Geochemical Characteristics and Genesis of Soil Gas CO₂ in the Longxian-Baoji Fault Zone

Author(s):: LIU Jie¹; LI Ying²; CHEN Zhi²; WANG Xin¹; ZHAO Xiaomao¹; FENG Xijie¹; WANG Jingli¹; (1.Shaanxi Earthquake Agency,Xi’an 710068,Shaanxi,China)(2.Institute of Earthquake Forecasting and Key Laboratory of Earthquake Prediction,China Earthquake Administration,Beijing 100036,China)

Keywords:: soil gas CO₂; intensity of gas activity; stable carbon isotope; fault activity

CLC:: P315.724

DOI:: 10.20015/j.cnki.ISSN1000-0666.2022.0020

Abstract:: The Longxian-Baoji Fault Zone is located in the northeast edge of the Qinghai-Tibet Block and belongs to the southernmost segment of the arc fault belt in the southwest edge of the Ordos Block.To compare the activity of the Qishan-Mazhao Fault in the south of the Longxian-Baoji Fault Zone with the activty of the Guguan-Guozhen Fault in the north,we study the geochemical features of the soil gas CO₂ in the faults.Six survey profiles for surveying CO₂ are deployed across the two faults and two periods of observation are carried out.We obtain 150 observed values of CO₂ component concentrations.In addition,we collect 60 CO₂ samples for stable carbon isotopic composition measurements.We find that the intensity(1.56-2.70)of CO₂ activity in the Qishan-Mazhao Fault is greater than that(1.73-1.75)in the Guguan-Guozhen Fault.And the source of the CO₂ in the Qishan-Mazhao Fault is closer to the end member of the deep materials.This suggests that the connectivity of the underground structures of the Qishan-Mazhao Fault is better and the fault’s locking degree is lower.Meanwhile,the gas activity in the Guguan-Guozhen Fault is weaker and the fault’s locking degree is higher.Thus,the earthquake risk in this fault zone is higher.

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Last Update: 2022-05-20