海原断裂带东南段土壤气体地球化学特征

doi:10.3969/j.issn.0253-4967.2011.01.012

地震地质 ›› 2011, Vol. 33 ›› Issue (1): 123-132.DOI: 10.3969/j.issn.0253-4967.2011.01.012

海原断裂带东南段土壤气体地球化学特征

周晓成^1,2, 王传远³, 柴炽章⁴, 司学芸⁴, 雷启云⁴, 李营², 谢超², 刘胜昌⁵

1. 中国科技大学地球和空间科学学院, 合肥 230026;
2. 中国地震局地震预测研究所, 北京 100036;
3. 中国科学院烟台海岸带研究所, 烟台 264003;
4. 宁夏回族自治区地震局, 银川 750001;
5. 河北理工大学, 唐山 063009

收稿日期:2009-10-19 修回日期:2010-06-17 出版日期:2011-04-29 发布日期:2011-12-18
作者简介:周晓成,男,1978年生,2005年在中国地震局地震预测研究所获构造地质专业硕士学位,现为中国科技大学在读博士生,助理研究员,主要从事构造地球化学、流体地球化学方面的研究,电话: 010-88015473,E-mail: zhouxiaocheng 188@163.com。
基金资助:
中国地震局地震预测研究所基本科研业务专项(0207690234)资助。

THE GEOCHEMICAL CHARACTERISTICS OF SOIL GAS IN THE SOUTHEASTERN PART OF HAIYUAN FAULT

ZHOU Xiao-cheng^1,2, WANG Chuan-yuan³, CHAI Chi-zhang⁴, SI Xue-yun⁴, LEI Qi-yun⁴, LI Ying², XIE Chao², LIU Sheng-chang⁵

1. School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;
2. Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China;
3. Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China;
4. Earthquake Administration of Ningxia Hui Autonomous Region, Yinchuan 750001, China;
5. Hebei Polytechnic University, Tangshan 063009, China

Received:2009-10-19 Revised:2010-06-17 Online:2011-04-29 Published:2011-12-18

摘要/Abstract

摘要：

在海原断裂带东南段4个地点跨断层测量了土壤气中He、H₂、N₂、O₂、CH₄、C₂H₆、Rn和Hg的浓度及He、H₂、CH₄、Rn和Hg的通量。测量结果表明,N₂/O₂、Hg和Rn的背景值分别是4.2、50.4ng/m³ 和5.8k Bq/m³; 土壤气中He和CH₄在海原断裂带东南段端部有强烈异常,并且脱气强烈,通量分别达到6.9mg m^-2d^-1 和390mg m^-2d^-1; 土壤气中H₂和Rn是指示海原断裂东南段破裂位置非常有利的气体组分,在靠断裂中部区域通量达到最高,分别为5.5mg m^-2d^-1 和828.6m Bqm^-2s^-1; 土壤气中Hg在断裂带的异常可作为指示断裂破裂位置的参考信号,其通量最高达到211.2ng m^-2h^-1。

关键词: 海原断裂带, 土壤气, 地球化学

Abstract:

The concentration of soil gas He, H₂, N₂, O₂, CH₄, C₂H₆, Rn, Hg and flux of soil gas He, H₂, CH₄, Rn, Hg were surveyed at four sites(Xiaokou,Bazhiyao,Caixiangpu and Xiaonanchuan)in the southeastern part of Haiyuan Fault.Soil-gas concentrations of more than 200 samples were obtained.The results show that the background values of N₂/O₂,Hg,Rn were 4.2,50.4ng/m³and 5.8k Bq/m³,respectively. The maximum concentrations of He and CH₄ were 65.3 and 537.7ppm,respectively,at the end of the southeastern part of Haiyuan Fault.Furthermore,soil gas He and CH₄ were intensively degassed.The maximum flux of He and CH₄ in soil gas was 6.9and 390mg m^-2d^-1,respectively.These may be caused by stress concentration at the end of the southeastern part of Haiyuan Fault.H₂ and Rn in soil gas were powerful components as indicators of location of the southeastern part of Haiyuan Fault.The maximum concentrations of H₂ and Rn in soil gas were 369.7ppm and 38.3k Bq/m³ near the middle of the southeastern part of Haiyuan Fault.The maximum fluxes of H₂ and Rn in soil gas were 5.5mg m^-2d^-1 and 828.6m Bqm^-2s^-1,respectively.These may be related with the intensive rupture of the middle of the southeastern part of Haiyuan Fault.The anomalies of Hg in soil gas at the fault were good reference indicators.The maximum flux of Hg in soil gas was 211.2ng m^-2h^-1.

Key words: Haiyuan Fault zone, soil gas, geochemistry

中图分类号:

P315.72⁺4

周晓成, 王传远, 柴炽章, 司学芸, 雷启云, 李营, 谢超, 刘胜昌. 海原断裂带东南段土壤气体地球化学特征[J]. 地震地质, 2011, 33(1): 123-132.

ZHOU Xiao-cheng, WANG Chuan-yuan, CHAI Chi-zhang, SI Xue-yun, LEI Qi-yun, LI Ying, XIE Chao, LIU Sheng-chang. THE GEOCHEMICAL CHARACTERISTICS OF SOIL GAS IN THE SOUTHEASTERN PART OF HAIYUAN FAULT[J]. SEISMOLOGY AND GEOLOGY, 2011, 33(1): 123-132.

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海原断裂带东南段土壤气体地球化学特征

THE GEOCHEMICAL CHARACTERISTICS OF SOIL GAS IN THE SOUTHEASTERN PART OF HAIYUAN FAULT

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