怀安盆地南缘断裂土壤气体地球化学特征与断裂活动性研究

doi:10.12196/j.issn.1000-3274.2025.02.011

摘要/Abstract

摘要： 怀安盆地位于张家口—渤海地震带与山西地震带的交会处。在河北怀安盆地南缘断裂带的寺沟村和官庄村布设了两条测线, 并开展了3期Rn、 CO₂及Hg浓度测量, 以获取区域背景场资料, 并分析土壤气Rn、 CO₂及Hg的地球化学特征空间差异及其与断裂活动的关系。结果表明, 寺沟村测线的土壤气Rn、 CO₂及Hg浓度平均值分别为2623.82 Bq/m³、 0.27%和10.88 ng/m³; 官庄村测线的土壤气Rn、 CO₂及Hg浓度平均值分别为4195.33 Bq/m³、 0.49%和13.43 ng/m³。 Rn、 CO₂及Hg的释放强度在寺沟村测线分别为1.42、 1.04和1.41, 而在官庄村测线分别为2.16、 2.92和1.34。官庄村地区的土壤气Rn、 CO₂及Hg浓度平均值均高于寺沟村地区, 分析认为这可能与断裂活动性及断裂破碎程度不同有关; Rn与CO₂相关系数最高, 其次为Rn与Hg, 而CO₂与Hg相关系数最低, 可能与CO₂作为Rn的载体有关。结合周边固定点的二氧化碳连续观测数据、地震M-t及频度分析, 认为怀安盆地南缘断裂曾发生较强的活动, 目前处于平静期, 构造活动性相对较弱。

关键词: 怀安盆地南缘断裂, 土壤气, 气体浓度, 断裂活动性

Abstract: The Huai’an Basin is located at the intersection of the Zhangjiakou-Bohai seismic belt and the Shanxi seismic belt. In this study, two survey lines were set up in the southern margin fault zone of the Huai’an Basin in Hebei Province, specifically in Sigou Village and Guanzhuang Village. Three periods of Rn, CO₂ and Hg concentration measurements were carried out to obtain regional background and analyze the spatial variations in the geochemical characteristics, as well as their relationship with fault activity. The results show that the average concentrations of Rn, CO₂ and Hg at the Sigou Village survey line were 2623.82 Bq/m³, 0.27%, and 10.88 ng/m³, respectively, while those at the Guanzhuang Village survey line were 4195.33 Bq/m³, 0.49%, and 13.43 ng/m³, respectively. The release intensities of Rn, CO₂ and Hg were 1.42, 1.04, and 1.41, respectively, at the Sigou Village survey line, and 2.16, 2.92, and 1.34, respectively, at the Guanzhuang Village survey line. The average concentrations of Rn, CO₂, and Hg in the Guanzhuang area were all higher than those in the Sigou area, possibly related to differences in fault activities and the degrees of fault fragmentation. The correlation coefficient between Rn and CO₂ was the highest, followed by that between Rn and Hg, with the lowest correlation coefficient between CO₂and Hg, which may be related to CO₂ acting as a carrier of Rn. Based on the continuous CO₂ monitoring data from fixed observation points around the area, and the M-t and frequency analyses of earthquakes, it is inferred that the southern margin fault of the Huai’an Basin has experienced strong activities in the past but is currently in a quiet period with relatively weak tectonic activity.

Key words: Southern margin fault zone of the Huai’an Basin, Soil gas, Gas concentration, Fault activity

中图分类号:

P315.7

张帆, 王江, 任佳, 唐杰, 张广莉, 只楠, 姜佳宁. 怀安盆地南缘断裂土壤气体地球化学特征与断裂活动性研究[J]. 地震, 2025, 45(2): 164-179.

ZHANG Fan, WANG Jiang, REN Jia, TANG Jie, ZHANG Guang-li, ZHI Nan, JIANG Jia-ning. Geochemical Characteristics of Soil Gas and Fracture Activity in the Southern Margin Fault Zone of the Huai’an Basin[J]. EARTHQUAKE, 2025, 45(2): 164-179.

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