Hu Ning, Ma Zhimin, Lou Luling, Zhang Baoshan, Wang Yu, Wang Mingliang, Wang Wenjing, Guo Deke. 2019: Geochemical characteristics of soil gas in Tangdong active fault zone. Acta Seismologica Sinica, 41(4): 524-535. DOI: 10.11939/jass.20180131
Citation: Hu Ning, Ma Zhimin, Lou Luling, Zhang Baoshan, Wang Yu, Wang Mingliang, Wang Wenjing, Guo Deke. 2019: Geochemical characteristics of soil gas in Tangdong active fault zone. Acta Seismologica Sinica, 41(4): 524-535. DOI: 10.11939/jass.20180131

Geochemical characteristics of soil gas in Tangdong active fault zone

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  • Received Date: January 08, 2019
  • Revised Date: March 28, 2019
  • Available Online: August 27, 2019
  • Published Date: June 30, 2019
  • Based on the distribution of H2, Rn and CO2 concentrations in the Tangdong active fault zone determined by multi-phase cross-fault observation in the field, this paper analyzed the gas geochemical characteristics and tectonic activity background of the fault zone, and revealed the relationship between geochemical characteristics of soil gases and the geological structure. The results showed that there were significant variations in H2, Rn and CO2 concentrations in different measurement periods. The gas concentrations of H2, Rn and CO2 in June were significantly higher than those in other measurement periods on the Zhanghecun measurement profile, while the gas concentrations of H2, Rn and CO2 in January were significantly higher than those in other measurement periods on the Xinglizhuang measurement profile. And the background values of H2 and Rn on Zhanghecun measurement line were (8.93±3.92)×10−6 and (17.38±4.28) kBq/m3, respectively, and concentrations of H2 and Rn exhibited synchronous anomalies at 135 m and 230 m from the main fault of Tangdong in the west of the measurement line. Accordingly on the Xinglizhuang measurement line, background concentrations values of H2 and Rn were (41.20±16.64)×10−6, (29.00±8.28) kBq/m3, and concentrations of H2 and Rn showed synchronous anomalies at 60 m from the main fault of Tangdong in the west of the measurement line. Furthermore, the shape of the gas concentration curves were similar for different measurement periods, and the anomaly spike showed perfect reproducibility on each investigation profile. There was a good correspondence between the high-value anomalies of the two investigation profiles and the results from geophysical exploration and trans-fault joint drilling. Therefore, it is deduced that the concentrations of H2 and Rn, which could be sensi-tive to the fault location, are the key indicators for gas geochemical observation of Tangdong fault zone.
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