朱夏断裂带和商丹断裂带土壤气地球化学特征

doi:10.12196/j.issn.1000-3274.2025.02.003

摘要/Abstract

摘要： 为研究秦岭大别造山带朱夏、商丹断裂带土壤气地球化学特征, 采用野外流动测量的方式对两条断裂布设了3条测线进行多期土壤气Rn和CO₂浓度测量。测量结果显示, 三条测线土壤气Rn和CO₂浓度的变化范围较大, 其中沙河店测线Rn浓度变化范围为3.31~128 kBq/m³, CO₂浓度变化范围为0.05%~2.3%; 赵家庄测线Rn浓度和CO₂浓度变化范围最大, 分别为1.63~243.5 kBq/m³和0.06%~1.26%; 罗李沟测线Rn浓度变化范围为16.5~143 kBq/m³, CO₂浓度变化范围为0.17%~1.86%。土壤气Rn和CO₂浓度对断裂的位置指示意义明确, 尤其是沙河店测线和赵家庄测线。土壤气释放强度计算结果显示, 赵家庄剖面中Rn释放强度显著高于另外两个剖面, 高达近4倍。通过计算沙河店测线、赵家庄测线和罗李沟测线三期测量的Rn异常衬度, 结合区内地震活动性和定点H₂连续观测数据, 初步认为, 沙河店测线和罗李沟测线所处的商丹断裂带活动性相对于赵家庄测线所处的朱夏断裂带较弱。

关键词: 土壤气, 地球化学特征, 朱夏断裂带, 商丹断裂带

Abstract: In order to study the geochemical characteristics of soil gas in the Zhuxia and Shangdan fault zones in the Qinling-Dabie orogenic belt, the field mobile measurement method was used to measure the soil gas Rn and CO₂ concentrations in three measuring lines of the two faults. The measurement results show that the concentrations of Rn and CO₂ in the three measuring lines vary in a wide range, among which the concentration of Rn in Shahedian measuring line varies from 3.31 to 128 kBq/m³, the concentration of CO₂ varies from 0.05% to 2.3%, and the concentration of Rn and CO₂ in Zhaojiazhuang measuring line range from 1.63 to 243.5 kBq/m³ and 0.06% to 1.26%, respectively. Which varies the largest range in the three measuring lines. The variation range of Rn concentration in Luoligou measuring line is 16.5~143 kBq/m³, and the variation range of CO₂ concentration is 0.17%~1.86%. Soil gas Rn and CO₂ have a clear indication of the fault location, especially the Shahedian and Zhaojiazhuang lines. By calculating the contrast of Rn anomalies of Shahedian line, Zhaojiazhuang line and Luoligou line, combined with the seismic activity in the area and the continuous observation data of hydrogen in the fixed point, it is preliminarily considered that the activity of Shangdan fault where Shahedian line and Luoligou line are located is weaker than that of Zhuxia fault where Zhaojiazhuang line is located.

Key words: Soil gas, Geochemical characteristics, Zhuxia fault zone, Shangdan fault zone

中图分类号:

P319.56

王明亮, 李源, 秦浦, 张菂, 夏修军. 朱夏断裂带和商丹断裂带土壤气地球化学特征[J]. 地震, 2025, 45(2): 33-48.

WANG Ming-liang, LI Yuan, QIN Pu, ZHANG Di, XIA Xiu-jun. Geochemical Characteristics of Soil Gas in Zhuxia Fault Zone and Shangdan Fault Zone[J]. EARTHQUAKE, 2025, 45(2): 33-48.

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