郯庐断裂带新沂——泗洪段土壤气Rn体积活度和CO_2浓度特征研究
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摘要
郯庐断裂带江苏段地区4个剖面进行了土壤气Rn体积活度和CO_2浓度测量结果显示,自北向南土壤气Rn体积活度均值分别为22.9kBq/m~3、35.5kBq/m~3、40.2kBq/m~3、26.6kBq/m~3;自北向南土壤气CO_2浓度均值分别为0.669%、0.400%、0.503%、1.109%。土壤气Rn体积活度和CO_2的浓度在空间分布上具有较好的一致性,这可能与CO_2是Rn的载气有关。综合分析土壤气Rn和CO_2测量结果以及水准资料可得,2017年土壤气Rn高值出现在晓店段可能与区域应力应变调整有关。本研究不仅为研究区以后的土壤气研究提供了参考,同时也可为研究区的构造活动研究提供地球化学资料参考。
Concentrations of soil gases Rn and CO_2 were measured at 4profiles in Jiangsu segment of Tanlu fault,the results show that the average concentrations of Rn observed at the four profiles are 22.9kBq/m~3,35.5kBq/m~3,40.2kBq/m~3 and 26.6kBq/m~3,and the average concentrations of CO_2 are 0.669%,0.400%,0.503% and 1.109% respectively.The concentration of soil gases Rn and CO_2 in the study area has a good consistency with the spatial distribution,which may be related to the fact that CO_2 is the carrier gas of Rn.A comprehensive analysis of soil gases Rn,CO_2 and the leveling data,indicated that the highest Rn concentration observed in Xiaodian section,which may be related to the adjustment of regional stress-strain.The results not only provide a reference for soil gas research,but also provide a reference of geochemical data for tectonic activities research in the study area.
Concentrations of soil gases Rn and CO_2 were measured at 4profiles in Jiangsu segment of Tanlu fault,the results show that the average concentrations of Rn observed at the four profiles are 22.9kBq/m~3,35.5kBq/m~3,40.2kBq/m~3 and 26.6kBq/m~3,and the average concentrations of CO_2 are 0.669%,0.400%,0.503% and 1.109% respectively.The concentration of soil gases Rn and CO_2 in the study area has a good consistency with the spatial distribution,which may be related to the fact that CO_2 is the carrier gas of Rn.A comprehensive analysis of soil gases Rn,CO_2 and the leveling data,indicated that the highest Rn concentration observed in Xiaodian section,which may be related to the adjustment of regional stress-strain.The results not only provide a reference for soil gas research,but also provide a reference of geochemical data for tectonic activities research in the study area.
引文
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[32] Toutain J P,Baubron J C.Gas geochemistry and seismotectonics:A review[J].Tectonophysics,1999,304:1-27.
[33] Etiope G,Martinelli G.Migration of carrier and trace gases in the geosphere:An overvies[J].Phys Earth Planet Inter,2002,129:185-204.
[34] Yang T F,Chou C Y,Chen C H,et al.Exhalation of radon and its carrier gases in SW Taiwan[J].Radiat Meas,2003,36:425-429.
[2] Li Y,Du J G,Wang X,et al.Spatial variations of soil gas geochemistry in the Tangshan area of northern China[J].Terr Atmos Oceanic Sci,2013,24(3):323-332.
[3] Fu C C,Yang T F,Du J,et al.Variations of helium and radon concentrations in soil gases from an active fault zone in southern Taiwan[J].Radiat Meas,2008,43(S1):348-352.
[4] Han X K,Li Y,Du J,et al.Rn and CO2geochemistry of soil gas across the active fault zones in the capital area of China[J].Nat Hazards Earth Syst.Sci.,2014,14(10):2 803-2 815.
[5] Yang T F,Walia V,Chyi L L,et al.Variations of soil radon and thoron concentrations in a fault zone and prospective earthquakes in SW Taiwan[J].Radiat Meas,2005,40:496-502.
[6] Lombardi S,Voltattorni N.Rn,He and CO2soil gas geochemistry for the study of active and inactive faults[J].Appl.Geochem.,2010,25(8):1 206-1 220.
[7] Walia V,Yang T F,Lin S J,et al.Temporal variation of soil gas compositions for earthquake surveillance in Taiwan[J].Radiat Meas,2013,50:154-159.
[8]李营,杜建国,王富宽,等.延怀盆地土壤气体地球化学特征[J].地震学报,2009,3(1):82-91.
[9] Zhou X,Du J,Chen Z,et al.Geochemistry of soil gas in the seismic fault zone produced by the Wenchuan MS8.0earthquake,Southwestern China[J].Geochemical Transactions,2010,11:5.
[10]周晓成,王传远,柴炽章,等.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.
[11]孙小龙,王广才,邵志刚,等.海原断裂带土壤气与地下水地球化学特征研究[J].地学前缘,2016,23(3):140-150.
[12]王喜龙,李营,杜建国,等.首都圈地区土壤气Rn,Hg,CO2地球化学特征及其成因[J].地震学报,2017,39(1):85-101.
[13]苏鹤军,张慧,李晨桦,等.西秦岭北缘断裂带断层气浓度空间分布特征与强震危险性分析[J].地震工程学报,2013,35(3):671-676.
[14]李晨桦,张慧,苏鹤军,等.西秦岭北缘断裂带深部气体地球化学特征与断层形变空间分布相关性研究[J].地震工程学报,2016,38(6):955-963.
[15]盛艳蕊,张子广,周晓成,等.新保安—沙城断裂带土壤气地球化学特征分析[J].地震,2015,35(4):90-98.
[16]张冠亚,周晓成,李营,等.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.
[17]施炜,张岳桥,董树文.郯庐断裂带中段第四纪活动及其分段特征[J].地球学报,2003,(1):11-18.
[18]李家灵,晁洪太,崔昭文,等.郯庐活断层的分段及其大震危险性分析[J].地震地质,1994,16(2):121-126.
[19]晁洪太,李家灵,崔昭文,等.郯庐断裂带中段全新世活断层的特征滑动行为与特征地震[J].内陆地震,1994,8(4):297-304.
[20]晁洪太,李家灵,崔昭文,等.郯庐断裂带潍坊-嘉山段全新世活断层的活动方式与发震模式[J].地震研究,1997,20(2):218-226.
[21]郑颖平,翟洪涛,李光,等.郯庐断裂带江苏新沂-安徽宿松段地震危险性分析[J].华北地震科学,2012,30(2):48-51.
[22]张扬,戴波,周晓成.郯庐断裂带江苏段土壤气体地球化学特征研究[J].地震研究,2016,39(3):444-449.
[23]李家灵,晁洪太,崔昭文,等.郯庐断裂带郯城-新沂段活断层研究[M].北京:地震出版社,1991.
[24]李家灵,晁洪太,崔昭文,等.1668年郯城8.5级地震断层及其破裂机制[J].地震地质,1994,16(3):229-237.
[25]晁洪太,李家灵,崔昭文,等.郯庐断裂带中段全新世活断层的几何结构与分段[M].北京:地震出版社,1994.
[26]谢瑞征,丁政,朱书俊,等.郯庐断裂带江苏及邻区第四纪活动特征[J].地震学刊,1991,(4):1-7.
[27]张鹏,李丽梅,冉勇康,等.郯庐断裂带安丘-莒县断裂江苏段晚第四纪活动特征研究[J].地震地质,2015,37(4):1 162-1 176.
[28]车用太.地下流体数字观测技术[M].北京:地震出版社,2002.
[29]刘学领,马建英,杨绪连,等.断层气探测方法在深隐伏活断层探测中的有效性研究[J].地震,2011,31(1):67-84.
[30]汪成民,李宣瑚.断层气测量在地震科学研究中的应用[M].北京:地震出版社,1991.
[31]伍剑波,张慧,苏鹤军.断层气氡在不同类型覆盖层中迁移规律的数值模拟[M].地震学报,2014,3(1):118-128.
[32] Toutain J P,Baubron J C.Gas geochemistry and seismotectonics:A review[J].Tectonophysics,1999,304:1-27.
[33] Etiope G,Martinelli G.Migration of carrier and trace gases in the geosphere:An overvies[J].Phys Earth Planet Inter,2002,129:185-204.
[34] Yang T F,Chou C Y,Chen C H,et al.Exhalation of radon and its carrier gases in SW Taiwan[J].Radiat Meas,2003,36:425-429.