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怀安盆地北缘断裂东段土壤气体地球化学特征
引用本文:张冠亚,周晓成,李营,崔月菊,韩晓昆,孙玉涛,孙凤霞,杜建国. 怀安盆地北缘断裂东段土壤气体地球化学特征[J]. 地震, 2015, 35(3): 113-122
作者姓名:张冠亚  周晓成  李营  崔月菊  韩晓昆  孙玉涛  孙凤霞  杜建国
作者单位:中国地震局地震预测重点实验室, 中国地震局地震预测研究所, 北京 100036
基金项目:中国地震局地震预测重点实验室专项
摘    要:活动断裂带的土壤气体地球化学测量在活动断裂危险性评价方面起着重要作用。 本文讨论了怀安盆地北缘断裂东段的土壤气体地球化学特征及其构造意义。 我们于2012年7月和2013年6月在怀安盆地北缘断裂东段的羊窖沟以及张家窑两地现场测量了土壤气体组分的浓度和通量。 测量结果表明: ① 断裂带土壤气H2、 Rn、 CO2和Hg浓度空间分布曲线呈现双峰模式, 且断裂下盘土壤气的Rn、 CO2和Hg浓度较上盘的高; H2、 Rn、 CO2和Hg浓度平均值分别是4.61 ppm、 4.81 k Bqm-3、 0.38%和9 ngm-3; 土壤气Rn和CO2的通量平均值分别是6718 Bqm-2d-1和49.83 gm-2d-1; ② 土壤气Rn和CO2在两个测区脱气强烈, 羊窖沟地区土壤气CO2、 Rn和Hg浓度平均值以及土壤气Rn和CO2通量值较张家窑地区高。 这些结果可能是两个测区断裂活动性差异引起的。

关 键 词:土壤气  断裂  怀安盆地  
收稿时间:2014-10-16

Geochemical Characteristics of Soil Gas in the Eastern Segment of the North Margin Fault of the Huaian Basin,Hebei Province
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]. China Earthguake Engineering Journal, 2015, 35(3): 113-122
Authors:ZHANG Guan-ya  ZHOU Xiao-cheng  LI Ying  CUI Yue-ju  HAN Xiao-kun  SUN Yu-tao  SUN Feng-xia  DU Jian-guo
Affiliation:Key Laboratory of Earthquake Prediction, Institute of Earthquake Science, CEA, Beijing 100036, China
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.
Keywords:Active fault  Flux  Soil gas  The Huaian basin
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