利用接收函数研究渭河地堑及其周边地壳结构
摘要
利用接收函数方法对横跨秦岭造山带、渭河地堑及鄂尔多斯块体的15个地震观测台站下方的地壳结构进行研究分析,结果表明三种不同类型(造山带型、拉张盆地型和稳定克拉通型)的构造单元的地壳结构和物质组成存在明显的差异.秦岭北缘平均地壳厚度为37.8 km,泊松比为0.247,相对偏低的泊松比表明地壳物质长英质组分增加.鄂尔多斯块体南缘平均地壳厚度为39.2 km,泊松比为0.265,偏高的泊松比与鄂尔多斯下方古老的铁镁质结晶基底以及浅部沉积有关.通过接收函数正演计算表明低速的、厚度较大的松散沉积层对Mohorovi i不连续面(Moho)的震相具有较大影响,是渭河地堑内部台站的接收函数Moho转换震相不清楚的主要原因.S波速度结构反演结果表明渭河地堑上覆松散沉积层,其厚度约为4~8 km,该沉积层使得位于渭河地堑内台站的接收函数Moho震相复杂.另外渭河地堑下方中下地壳位置存在一高速区域,该高速体可能与渭河断裂系统的活动有关.
引文
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范俊喜,马瑾,甘卫军.2003.鄂尔多斯地块运动的整体性与不同边界活动的交替性.中国科学D辑:地球科学,33:119–128
冯希杰,李晓妮,任隽,等.2008.渭河断裂深、中、浅和近地表显示.地震地质,30:264–272
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,83:324–330
李多,周仕勇,陈永顺,等.2012.鄂尔多斯地区上地幔岩石圈三维速度结构面波反演研究.地球物理学报,55:1613–1623
李延兴,张静华,郭良迁,等.2005.鄂尔多斯的逆时针旋转与动力学.大地测量与地球动力学,25:50–56
刘春,崇加军,倪四道,等.2009.利用远震接收函数反演陕西地震台站下方的地壳厚度.地震地质,31:313–320
欧阳建平,张本仁.1996.北秦岭微古陆形成与演化的地球化学证据.中国科学D辑:地球科学,26:42–48
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师亚芹,冯希杰,戴王强,等.2008.渭河断裂西安段的展布及其结构特征.地震学报,30:634–647
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吴庆举,田小波,张乃铃,等.2003.计算台站接收函数的最大熵谱反褶积方法.地震学报,25:382–389
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张国伟,孟庆任,于在平,等.1996.秦岭造山带的造山过程及其动力学特征.中国科学D辑:地球科学,26:193–200
张复新,杜孝华,王伟涛,等.2004.秦岭造山带及邻区中生代地质演化与成矿作用响应.地质科学,39:486–495
张岳桥,廖昌珍.2003.晚中生代-新生代构造体制转换与鄂尔多斯盆地改造.中国地质,33:28–40
Ammon C J,Randall G E,Zandt G.1990.On the Nonuniqueness of Receiver Function Inversions.J Geophys Res,95:15303–15318.doi:10 .1029/JB095iB10p15303
Ammon C J.1991.The isolation of receiver effects from teleseismic P waveforms.Bull Seism Soc Am,81:2504–2510
Christensen N I,Fountain D M.1975.Constitution of the lower continental crust based on experimental studies of seismic velocities in granulite.Geol Soc Am Bull,86:227–236
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Kennett B L N.1983.Seismic Wave Propagation in Atratified Media.New York:Cambridge University Press
Langston C A.1977a.The effect of planar dipping structure on source and receiver responses for constant ray parameter.Bull Seism Soc Am,67:1029–1050
Langston C A.1977b.Corvallis,Oregon,crustal and upper mantle receiver structure from teleseismic P and S waves.Bull Seism Soc Am,67:713 –724
Langston C A.1979.Structure under Mount Rainier,Washington,inferred from teleseismic body waves.J Geophys Res,84:4749–4762,doi:10 .1029/JB084iB09p04749
Langston C A,Hammer J K.2001.The vertical component P-wave receiver function.Bull Seism Soc Am,91:1805–1819
Mohsen A,Asch G,Mechie J,et al.2011.Crustal structure of the Dead Sea Basin(DSB)from a receiver function analysis.Geophys J Int,184:463 –476,doi:10.1111/j.1365-246X.2010.04853.x
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,89:7783–7795,doi:10.1029/JB089iB09p07783
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Randall G E.1989.Efficient calculation of differential seismograms for lithospheric receiver functions.Geophys J Int,99:469–481
Sodoudi F,Yuan X,Kind R,et al.2009.Evidence for a missing crustal root and a thin lithosphere beneath the Central Alborz by receiver function studies.Geophys J Int,177:733–742,doi:10.1111/j.1365-246X.2009.04115.x
Tian X,Teng J,Zhang H,et al.2011.Structure of crust and upper mantle beneath the Ordos Block and the Yinshan Mountains revealed by receiver function analysis.Phys Earth Planet Inter,184:186–193,doi:10.1016/j.pepi.2010.11.007
Tian Y,Zhao D,Sun R,et al.2009.Seismic imaging of the crust and upper mantle beneath the North China Craton.Phys Earth Planet Inter,172:169 –182
Zhang Y Q,Vergely P,Mercier J.1995.Active faulting in and along the Qinling Range(China)inferred from SPOT imagery analysis and extrusion tectonics of south China.Tectonophysics,243:69–95
Zhao D,Huang Z C,Umino N,et al.2011a.Structural heterogeneity in the megathrust zone and mechanism of the 2011 Tohoku-oki earthquake(Mw9 .0).Geophys Res Lett,38:L17308,doi:10.1029/2011gl048408
Zhao D,Yu S,Ohtani E.2011b.East Asia:Seismotectonics,magmatism and mantle dynamics.J Asian Earth Sci,40:689–709,doi:10 .1016/j.jseaes.2010.11.013
Zhao L,Zheng T.2005.Seismic structure of the Bohai Bay Basin,northern China:Implications for basin evolution.Earth Planet Sci Lett,231:9 –22,doi:10.1016/j.epsl.2004.12.028
Zheng T,Zhao L,Chen L.2005.A detailed receiver function image of the sedimentary structure in the Bohai Bay Basin.Phys Earth Planet Inter,152 :129–143,doi:10.1016/j.pepi.2005.06.011
Zhu L,Kanamori H.2000.Moho depth variation in southern California from teleseismic receiver functions.J Geophys Res,105:2969–2980,doi:10 .1029/1999jb900322
范俊喜,马瑾,甘卫军.2003.鄂尔多斯地块运动的整体性与不同边界活动的交替性.中国科学D辑:地球科学,33:119–128
冯希杰,李晓妮,任隽,等.2008.渭河断裂深、中、浅和近地表显示.地震地质,30:264–272
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,83:324–330
李多,周仕勇,陈永顺,等.2012.鄂尔多斯地区上地幔岩石圈三维速度结构面波反演研究.地球物理学报,55:1613–1623
李延兴,张静华,郭良迁,等.2005.鄂尔多斯的逆时针旋转与动力学.大地测量与地球动力学,25:50–56
刘春,崇加军,倪四道,等.2009.利用远震接收函数反演陕西地震台站下方的地壳厚度.地震地质,31:313–320
欧阳建平,张本仁.1996.北秦岭微古陆形成与演化的地球化学证据.中国科学D辑:地球科学,26:42–48
任隽,彭建兵,王夫运,等.2012.渭河盆地及邻区地壳深部结构特征研究.地球物理学报,55:2939–2947
师亚芹,冯希杰,戴王强,等.2008.渭河断裂西安段的展布及其结构特征.地震学报,30:634–647
唐有彩,冯永革,陈永顺,等.2010.山西断陷带地壳结构的接收函数研究.地球物理学报,53:2102–2109
吴庆举,田小波,张乃铃,等.2003.计算台站接收函数的最大熵谱反褶积方法.地震学报,25:382–389
张成立,王涛,王晓霞.2008.秦岭造山带早中生代花岗岩成因及其构造环境.高校地质学报,14:304–316
张国伟,孟庆任,于在平,等.1996.秦岭造山带的造山过程及其动力学特征.中国科学D辑:地球科学,26:193–200
张复新,杜孝华,王伟涛,等.2004.秦岭造山带及邻区中生代地质演化与成矿作用响应.地质科学,39:486–495
张岳桥,廖昌珍.2003.晚中生代-新生代构造体制转换与鄂尔多斯盆地改造.中国地质,33:28–40
Ammon C J,Randall G E,Zandt G.1990.On the Nonuniqueness of Receiver Function Inversions.J Geophys Res,95:15303–15318.doi:10 .1029/JB095iB10p15303
Ammon C J.1991.The isolation of receiver effects from teleseismic P waveforms.Bull Seism Soc Am,81:2504–2510
Christensen N I,Fountain D M.1975.Constitution of the lower continental crust based on experimental studies of seismic velocities in granulite.Geol Soc Am Bull,86:227–236
Eagar K C,Fouch M J,James D E,et al.2011.Crustal structure beneath the High Lava Plains of eastern Oregon and surrounding regions from receiver function analysis.J Geophys Res,116:B02313,doi:10.1029/2010jb007795
Huang Z C,Xu M,Wang L S,et al.2008.Shear wave splitting in the southern margin of the Ordos Block,north China.Geophys Res Lett,35:L19301,doi:10.1029/2008gl035188
Kennett B L N.1983.Seismic Wave Propagation in Atratified Media.New York:Cambridge University Press
Langston C A.1977a.The effect of planar dipping structure on source and receiver responses for constant ray parameter.Bull Seism Soc Am,67:1029–1050
Langston C A.1977b.Corvallis,Oregon,crustal and upper mantle receiver structure from teleseismic P and S waves.Bull Seism Soc Am,67:713 –724
Langston C A.1979.Structure under Mount Rainier,Washington,inferred from teleseismic body waves.J Geophys Res,84:4749–4762,doi:10 .1029/JB084iB09p04749
Langston C A,Hammer J K.2001.The vertical component P-wave receiver function.Bull Seism Soc Am,91:1805–1819
Mohsen A,Asch G,Mechie J,et al.2011.Crustal structure of the Dead Sea Basin(DSB)from a receiver function analysis.Geophys J Int,184:463 –476,doi:10.1111/j.1365-246X.2010.04853.x
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,89:7783–7795,doi:10.1029/JB089iB09p07783
Pan S,Niu F.2011.Large contrasts in crustal structure and composition between the Ordos Plateau and the NE Tibetan Plateau from receiver function analysis.Earth Planet Sci Lett,303:291–298,doi:10.1016/j.epsl.2011.01.007
Randall G E.1989.Efficient calculation of differential seismograms for lithospheric receiver functions.Geophys J Int,99:469–481
Sodoudi F,Yuan X,Kind R,et al.2009.Evidence for a missing crustal root and a thin lithosphere beneath the Central Alborz by receiver function studies.Geophys J Int,177:733–742,doi:10.1111/j.1365-246X.2009.04115.x
Tian X,Teng J,Zhang H,et al.2011.Structure of crust and upper mantle beneath the Ordos Block and the Yinshan Mountains revealed by receiver function analysis.Phys Earth Planet Inter,184:186–193,doi:10.1016/j.pepi.2010.11.007
Tian Y,Zhao D,Sun R,et al.2009.Seismic imaging of the crust and upper mantle beneath the North China Craton.Phys Earth Planet Inter,172:169 –182
Zhang Y Q,Vergely P,Mercier J.1995.Active faulting in and along the Qinling Range(China)inferred from SPOT imagery analysis and extrusion tectonics of south China.Tectonophysics,243:69–95
Zhao D,Huang Z C,Umino N,et al.2011a.Structural heterogeneity in the megathrust zone and mechanism of the 2011 Tohoku-oki earthquake(Mw9 .0).Geophys Res Lett,38:L17308,doi:10.1029/2011gl048408
Zhao D,Yu S,Ohtani E.2011b.East Asia:Seismotectonics,magmatism and mantle dynamics.J Asian Earth Sci,40:689–709,doi:10 .1016/j.jseaes.2010.11.013
Zhao L,Zheng T.2005.Seismic structure of the Bohai Bay Basin,northern China:Implications for basin evolution.Earth Planet Sci Lett,231:9 –22,doi:10.1016/j.epsl.2004.12.028
Zheng T,Zhao L,Chen L.2005.A detailed receiver function image of the sedimentary structure in the Bohai Bay Basin.Phys Earth Planet Inter,152 :129–143,doi:10.1016/j.pepi.2005.06.011
Zhu L,Kanamori H.2000.Moho depth variation in southern California from teleseismic receiver functions.J Geophys Res,105:2969–2980,doi:10 .1029/1999jb900322
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