南襄盆地及邻区地壳厚度与泊松比研究
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摘要
利用河南、湖北、陕西地震台网共27个固定台站记录到的2014～2016年远震波形的接收函数,通过叠加获得了南襄盆地及邻区26个台站下方的地壳厚度和泊松比,结合该区地形地貌特征、断裂分布和地震活动,得出以下结论:(1)南襄盆地及邻区的地壳厚度与地形变化关联紧密,呈现出由NE向SW方向增厚的趋势,地壳厚度为30～41km;(2)泊松比高值集中在房县-兴山附近,为0.31～0.34,这可能与区域内大量出露寒武-奥陶系的辉长岩、苏长岩等铁镁质基性岩相关;低值为0.18～0.24,分布在商南-西峡-淅川一带,与区域内存在大量的长英质岩有关,它们与南襄盆地内的新生代沉积地层形成整合接触关系。由此可推断,在淅川、西峡一带存在因介质的较大差异而导致地震射线在传播过程中出现反射的可能。
In this paper,the receiver functions of the teleseismic waveforms from 2014 to 2016 recorded by 27 fixed seismic stations of Henan Digital Seismic Network,Hubei Digital Seismic Network,and Shanxi Digital Seismic Network were used to obtain the crust thickness and Poisson's ratio of the stations below the 26 seismic stations in the Nanxiang Basin and its adjacent area,which combined with the fracture distribution,seismicity,and topographic features of the area,has reached the following conclusions:(1) The crust thickness of the Nanxiang Basin and its adjacent areas is closely related to terrain change. It shows a trend of thickening from the northeast to the southwest,and the crust thickness is 30-41 km.(2) The high value area of Poisson's ratio is located in the vicinity of Fangxian and Xingshan,the value of which is from 0.31 to 0.34. It may be associated with a large number of mafic rocks in the Cambrian-Ordovician,such as gabbro and sulphite. The range of low value is from 0.18 to 0.24,and the area distributes in Shangnan and Xixia,and is related to a large number of felsic rocks. They formed an integrated contact with Cenozoic sedimentary strata in the Nanxiang Basin. From this,it can be inferred that there is a possibility of reflection of seismic rays during the propagation process due to large differences in the medium between the Xichuan and Xixia areas.
In this paper,the receiver functions of the teleseismic waveforms from 2014 to 2016 recorded by 27 fixed seismic stations of Henan Digital Seismic Network,Hubei Digital Seismic Network,and Shanxi Digital Seismic Network were used to obtain the crust thickness and Poisson's ratio of the stations below the 26 seismic stations in the Nanxiang Basin and its adjacent area,which combined with the fracture distribution,seismicity,and topographic features of the area,has reached the following conclusions:(1) The crust thickness of the Nanxiang Basin and its adjacent areas is closely related to terrain change. It shows a trend of thickening from the northeast to the southwest,and the crust thickness is 30-41 km.(2) The high value area of Poisson's ratio is located in the vicinity of Fangxian and Xingshan,the value of which is from 0.31 to 0.34. It may be associated with a large number of mafic rocks in the Cambrian-Ordovician,such as gabbro and sulphite. The range of low value is from 0.18 to 0.24,and the area distributes in Shangnan and Xixia,and is related to a large number of felsic rocks. They formed an integrated contact with Cenozoic sedimentary strata in the Nanxiang Basin. From this,it can be inferred that there is a possibility of reflection of seismic rays during the propagation process due to large differences in the medium between the Xichuan and Xixia areas.
引文
邓嘉美、陈佳、高琼等,2016,云南宾川地区的地壳厚度和泊松比分布特征研究,地震,36(3),99~108.
冯锐,1985,中国地壳厚度及上地幔密度分布(三维重力反演结果),地震学报,7(2),143~157.
高延光、李永华,2014,中国东北-华北地区地壳厚度与泊松比及其地质意义,地球物理学报,57(3),847~857.
龚辰、李秋生、叶卓等,2016,远震P波接收函数揭示的张家口(怀来)-中蒙边境(巴音温多尔)剖面地壳厚度与泊松比,地球物理学报,59(3),897~911.
宫猛、李信富、张素欣等,2015,利用接收函数研究河北及邻区地壳厚度与泊松比分布特征,地震,35(2),34~42.
黄海波、郭兴伟、夏少红等,2014,华南沿海地区地壳厚度与泊松比研究,地球物理学报,57(12),3896~3906.
嵇少丞、王茜、杨文采,2009,华北克拉通泊松比与地壳厚度的关系及其大地构造意义,地质学报,83(3),324~330.
刘绍龙、刘宁、薛玉玮等,1998,南襄盆地隐伏区前中生界展布规律及其大地构造意义,河南石油,12(4),1~6.
齐刚、陈棋福,2015,太行山与燕山交汇部位的地壳厚度与泊松比分布特征,地球物理学报,58(9),3239~3250.
钱辉、李海兵、Mechie J等,2015,接收函数H-k叠加方法在龙门山台阵的应用,地球物理学进展,30(1),91~98.
沈玉松、康英、徐果明,2013,广东及其邻域的地壳厚度和泊松比分布,中国地震,29(2),210~218.
滕吉文、曾融生、闫雅芬等,2002,东亚大陆及周边海域Moho界面深度分布和基本构造格局,中国科学:D辑,32(2),89~100.
王椿镛、吴庆举、段永红等,2017,华北地壳上地幔结构及其大地震深部构造成因,中国科学:地球科学,47(6),684~719.
王林昌、王勉、王晓谦等,2011,南阳盆地特殊震相研究,高原地震,23(3),30~33.
王晓霞、王涛、张成立,2015,秦岭造山带花岗质岩浆作用与造山带演化,中国科学:地球科学,45(8),1109~1125.
吴庆举、曾融生,1998,用宽频带远震接收函数研究青藏高原的地壳结构,地球物理学报,41(5),669~679.
许卫卫、郑天愉,2005,渤海湾盆地北西盆山边界地区泊松比分布,地球物理学报,48(5),1077~1084.
杨冬、王典、刘殿秘等,2008,南襄盆地及邻域壳幔结构地球物理特征与油气条件分析,世界地质,27(1),48~52.
张宏飞、张利、高山等,1999,桐柏地区变质杂岩和侵入岩类Pb同位素组成特征及其地质意义,地球科学:中国地质大学学报,24(3),269~273.
郑勇、葛粲、谢祖军等,2013,芦山与汶川地震震区地壳上地幔结构及深部孕震环境,中国科学:地球科学,43(6),1027~1037.
Christensen N I,1996,Poisson's ratio and crustal seismology,J Geophys Res,101(B2),3139~3156.
He R Z,Shang X F,Yu C Q,et al,2014,A unified map of Moho depth and VP/VSratio of continental China by receiver function analysis,Geophys J Int,199(3),1910~1918.
Ji S C,2008,Deformation mechanisms,rheology,and seismic properities of rocks,539,Beijing:Geological Publishing House.
Ji S C,Wang Q,Xia B,2002,Handbook of seismic properties of minerals,rocks and ores,630,Montreal:Polytechnic International Press.
Jo E,Hong T K,2013,VP/VSratios in the upper crust of the southern Korean Peninsula and their correlations with seismic and geophysical properties,J Asian Earth Sci,66,204~214.
Langston C A,1979,Structure under Mount Rainier,Washington,inferred from teleseismic body waves,J Geophys Res,84(B9),4749~4762.
Li Y H,Gao M T,Wu Q J,2014,Crustal thickness map of the Chinese mainland from teleseismic receiver functions,Tectonophysics,611,51~60.
Owens T J,Zandt G,Taylor S R,1984,Seismic evidence for an ancient rift beneath the Cumberland Plateau,Tennessee:a detailed analysis of broadband teleseismic P waveforms,J Geophys Res,89(B9),7783~7795.
Salah M K,Seno T,2008,Imaging of VP,VS,and Poisson's ratio anomalies beneath Kyushu,southwest Japan:Implications for volcanism and forearc mantle wedge serpentinization,J Asian Earth Sci,31(4/5/6),404~428.
Salah M K,ahin S,Aydin U,2011,Seismic velocity and Poisson's ratio tomography of the crust beneath East Anatolia,J Asian Earth Sci,40(3),746~761.
Tugume F,Nyblade A,Juli1 J,2012,Moho depths and Poisson's ratios of Precambrian crust in East Africa:Evidence for similarities in Archean and Proterozoic crustal structure,Earth Planet Sci Lett,355/356,73~81.
Wei Z G,Chen L,Li Z W,et al,2016,Regional variation in Moho depth and Poisson's ratio beneath eastern China and its tectonic implications,J Asian Earth Sci,115,308~320.
Yang W C,Qu C,Yu C Q,2011,Crustal Poisson's ratio anomalies in the eastern part of North China and their origins,Geosci Front,2(3),313~321.
Zandt G,Ammon C J,1995,Continental crust composition constrained by measurements of crustal Poisson's ratio,Nature,374(6518),152~154.
Zhang H F,Gao S,Zhang B R,et al,1997,Pb isotopes of granitoids suggest Devonian accretion of Yangtze(South China)craton to North China craton,Geology,25(11),1015~1018.
Zhu L P,Kanamori H,2000,Moho depth variation in southern California from teleseismic receiver functions,J Geophys Res,105(B2),2969~2980.
(1)淅川-西峡震群:2008~2018年发生在淅川、西峡等地ML≥2.0地震,共16次
冯锐,1985,中国地壳厚度及上地幔密度分布(三维重力反演结果),地震学报,7(2),143~157.
高延光、李永华,2014,中国东北-华北地区地壳厚度与泊松比及其地质意义,地球物理学报,57(3),847~857.
龚辰、李秋生、叶卓等,2016,远震P波接收函数揭示的张家口(怀来)-中蒙边境(巴音温多尔)剖面地壳厚度与泊松比,地球物理学报,59(3),897~911.
宫猛、李信富、张素欣等,2015,利用接收函数研究河北及邻区地壳厚度与泊松比分布特征,地震,35(2),34~42.
黄海波、郭兴伟、夏少红等,2014,华南沿海地区地壳厚度与泊松比研究,地球物理学报,57(12),3896~3906.
嵇少丞、王茜、杨文采,2009,华北克拉通泊松比与地壳厚度的关系及其大地构造意义,地质学报,83(3),324~330.
刘绍龙、刘宁、薛玉玮等,1998,南襄盆地隐伏区前中生界展布规律及其大地构造意义,河南石油,12(4),1~6.
齐刚、陈棋福,2015,太行山与燕山交汇部位的地壳厚度与泊松比分布特征,地球物理学报,58(9),3239~3250.
钱辉、李海兵、Mechie J等,2015,接收函数H-k叠加方法在龙门山台阵的应用,地球物理学进展,30(1),91~98.
沈玉松、康英、徐果明,2013,广东及其邻域的地壳厚度和泊松比分布,中国地震,29(2),210~218.
滕吉文、曾融生、闫雅芬等,2002,东亚大陆及周边海域Moho界面深度分布和基本构造格局,中国科学:D辑,32(2),89~100.
王椿镛、吴庆举、段永红等,2017,华北地壳上地幔结构及其大地震深部构造成因,中国科学:地球科学,47(6),684~719.
王林昌、王勉、王晓谦等,2011,南阳盆地特殊震相研究,高原地震,23(3),30~33.
王晓霞、王涛、张成立,2015,秦岭造山带花岗质岩浆作用与造山带演化,中国科学:地球科学,45(8),1109~1125.
吴庆举、曾融生,1998,用宽频带远震接收函数研究青藏高原的地壳结构,地球物理学报,41(5),669~679.
许卫卫、郑天愉,2005,渤海湾盆地北西盆山边界地区泊松比分布,地球物理学报,48(5),1077~1084.
杨冬、王典、刘殿秘等,2008,南襄盆地及邻域壳幔结构地球物理特征与油气条件分析,世界地质,27(1),48~52.
张宏飞、张利、高山等,1999,桐柏地区变质杂岩和侵入岩类Pb同位素组成特征及其地质意义,地球科学:中国地质大学学报,24(3),269~273.
郑勇、葛粲、谢祖军等,2013,芦山与汶川地震震区地壳上地幔结构及深部孕震环境,中国科学:地球科学,43(6),1027~1037.
Christensen N I,1996,Poisson's ratio and crustal seismology,J Geophys Res,101(B2),3139~3156.
He R Z,Shang X F,Yu C Q,et al,2014,A unified map of Moho depth and VP/VSratio of continental China by receiver function analysis,Geophys J Int,199(3),1910~1918.
Ji S C,2008,Deformation mechanisms,rheology,and seismic properities of rocks,539,Beijing:Geological Publishing House.
Ji S C,Wang Q,Xia B,2002,Handbook of seismic properties of minerals,rocks and ores,630,Montreal:Polytechnic International Press.
Jo E,Hong T K,2013,VP/VSratios in the upper crust of the southern Korean Peninsula and their correlations with seismic and geophysical properties,J Asian Earth Sci,66,204~214.
Langston C A,1979,Structure under Mount Rainier,Washington,inferred from teleseismic body waves,J Geophys Res,84(B9),4749~4762.
Li Y H,Gao M T,Wu Q J,2014,Crustal thickness map of the Chinese mainland from teleseismic receiver functions,Tectonophysics,611,51~60.
Owens T J,Zandt G,Taylor S R,1984,Seismic evidence for an ancient rift beneath the Cumberland Plateau,Tennessee:a detailed analysis of broadband teleseismic P waveforms,J Geophys Res,89(B9),7783~7795.
Salah M K,Seno T,2008,Imaging of VP,VS,and Poisson's ratio anomalies beneath Kyushu,southwest Japan:Implications for volcanism and forearc mantle wedge serpentinization,J Asian Earth Sci,31(4/5/6),404~428.
Salah M K,ahin S,Aydin U,2011,Seismic velocity and Poisson's ratio tomography of the crust beneath East Anatolia,J Asian Earth Sci,40(3),746~761.
Tugume F,Nyblade A,Juli1 J,2012,Moho depths and Poisson's ratios of Precambrian crust in East Africa:Evidence for similarities in Archean and Proterozoic crustal structure,Earth Planet Sci Lett,355/356,73~81.
Wei Z G,Chen L,Li Z W,et al,2016,Regional variation in Moho depth and Poisson's ratio beneath eastern China and its tectonic implications,J Asian Earth Sci,115,308~320.
Yang W C,Qu C,Yu C Q,2011,Crustal Poisson's ratio anomalies in the eastern part of North China and their origins,Geosci Front,2(3),313~321.
Zandt G,Ammon C J,1995,Continental crust composition constrained by measurements of crustal Poisson's ratio,Nature,374(6518),152~154.
Zhang H F,Gao S,Zhang B R,et al,1997,Pb isotopes of granitoids suggest Devonian accretion of Yangtze(South China)craton to North China craton,Geology,25(11),1015~1018.
Zhu L P,Kanamori H,2000,Moho depth variation in southern California from teleseismic receiver functions,J Geophys Res,105(B2),2969~2980.
(1)淅川-西峡震群:2008~2018年发生在淅川、西峡等地ML≥2.0地震,共16次
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