| 汤东活动断裂带气体地球化学特征 |
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| 引用本文： | 胡宁,马志敏,娄露玲,张宝山,王宇,王明亮,王文净,郭德科.汤东活动断裂带气体地球化学特征[J].地震学报,2019,41(4):524-535. |
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| 作者姓名： | 胡宁 马志敏 娄露玲 张宝山 王宇 王明亮 王文净 郭德科 |
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| 作者单位： | 中国河南新乡 453000 河南省新乡市地震局;中国河南新乡 453000 河南省新乡市第一中学;中国郑州 450000 河南省地震局 |
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| 基金项目： | 地震科技星火计划项目（XH19028YSX和XH16026）和国家自然科学基金（41601584）共同资助 |
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| 摘 要： | 本文采用野外多期跨断层流动观测测定了汤东活动断裂带H2，Rn和CO2的分布特征，以此分析了该断裂带的气体地球化学特征及其活动背景，从而揭示了气体地球化学特征与构造之间的联系。分析结果显示:不同测量期次的H2，Rn和CO2浓度存在显著差异，其中张河村测线的各期次测量结果中6月份各组分气体浓度均显著高于其它期次，而邢李庄测线的测量结果中1月份各组分气体浓度均显著高于其它期次；各测量期次的各气体组分分布曲线特征相似，高值异常点的重现性较好。张河村测线多期测量的H2和Rn浓度背景值分别为（8.93±3.92）×10?6和（17.38±4.28） kBq/m3，在测线西部距汤东主断裂135 m和230 m处H2与Rn同步出现高值异常；邢李庄测线H2和Rn的背景值分别为（41.20±16.64）×10?6和（29.00±8.28） kBq/m3，H2与Rn在测线西部距汤东主断裂60 m处同步出现异常。两测线的气体浓度高值异常部位与地球物理、跨断层联合钻孔详勘结果之间存在较好的对应关系，由此可推断观测气体浓度能够敏感地指示断裂带位置，而且H2和Rn浓度是汤东断裂带气体地球化学观测的关键指标。
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| 关 键 词： | 断裂带气体 分布特征 气体来源 构造条件 汤东断裂带 |
| 收稿时间： | 2019-01-09 |
Geochemical characteristics of soil gas in Tangdong active fault zone |
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| Affiliation: | 1.Earthquake Agency of Xinxiang City，Henan Xinxiang 453000，China2.Xinxiang No.1 High School，Henan Xinxiang 453000，China3.Henan Earthquake Agency，Zhengzhou 450000，China |
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| Abstract: | 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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