怀安盆地北缘断裂东段土壤气体地球化学特征

Abstract

Abstract: Soil gas measurement over active fault has an important significance to assess the risk of active faults. In this paper, geochemical characteristics and tectonic significance of geochemical characteristics in the eastern segment of the north margin fault in the Huaian Basin have been discussed. Concentration of Rn, CO₂, Hg and H₂ and flux of Rn and CO₂ were measured twice in the field at two sites (Zhangjiayao and Yangjiaogou) across the eastern segment of the north margin fault in the Huaian Basin in July 2012 and June 2013, respectively.The measured results indicate that: ① The average concentration of H₂, Rn, CO₂ and Hg were 4.61 ppm ,4.81 k Bq/m³ , 0.38% and 9 ng/m³, respectively. The average flux of CO₂ and Rn are 11664 Bqm^-2d^-1 and 49.83 gm^-2d^-1, respectively. The concentration distribution curves of H₂, Rn, CO₂, and Hg in soil gas are characterized by bimodal pattern, the concentration of soil gas in the footwall is higher than that in the hanging wall. ② Soil gas Rn and CO₂ are degassed intensively in the eastern segment of the north margin fault of the Huaian Basin. Average concentration value of Rn, CO₂ and Hg and flux of Rn and CO₂ in yangjiaogou profile are higher than that in zhangjiayao profiles. The results might be caused by the fault activity difference of the two sites.

Key words: Active fault, Flux, Soil gas, The Huaian basin

CLC Number:

P315.7

ZHANG Guan-ya, ZHOU Xiao-cheng, LI Ying, CUI Yue-ju, HAN Xiao-kun, SUN Yu-tao, SUN Feng-xia, DU Jian-guo. Geochemical Characteristics of Soil Gas in the Eastern Segment of the North Margin Fault of the Huaian Basin, Hebei Province[J]. EARTHQUAKE, 2015, 35(3): 113-122.

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Geochemical Characteristics of Soil Gas in the Eastern Segment of the North Margin Fault of the Huaian Basin, Hebei Province

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