华北东部地区地壳泊松比异常及其成因
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摘要
利用地震层析成像方法可以提供地壳上地幔P波和S波速度扰动精细图像,进一步换算还可以得到泊松比的图像。但是,与P波和S波速度扰动图像相比,泊松比成像是否具有独特优点还有待研究。通过对华北东部进行了高分辨率地震层析成像研究,作出了该地区地壳速度结构和泊松比的图像,揭示了该区域存在一个高泊松比异常区,位于恒山—北太行—张家口一带,为深部构造演化提供新的地球物理制约。从上地壳延伸到厚度达26 km左右的中地壳,地壳泊松比增加。根据岩石物理性质和其他地质信息,恒山—北太行—张家口地壳高泊松比异常可以用中新生代华北克拉通地壳减薄过程中上地幔部分熔融及玄武质岩浆底侵作用来解释。
The seismic tomography can provide both fine P-wave and S-wave velocity structures of the crust and upper mantle,and also a Poisson's ratio image from the seismic velocities via proper computation.However,it is unsure that Poisson's ratio images have any advantages comparing with the P-wave and S-wave velocity images.In this study,the high resolution seismic tomography is applied to the determination of detailed 3-D crustal P-and S-wave seismic velocities structure as well as Poisson's ratio images under the eastern part of North China region.Results of Poisson's ratio imaging show a high Poisson's ratio(high-PR)anomalies located in Hengshan-North Taihang-Zhangjiakou(H-NT-Z)region,showing Poisson's ratio imaging can provide new geophysical constraints for the regional tectonic evolution.H-NT-Z region shows prominent and continuous high-PR anomalies in upper crust,extending down to the middle crust with thickness up to about 26 km.According to petrophysical property measurements and other geological data,this crustal Poisson's ratio anomaly may be explained by the upper mantle partial melting and basaltic magma underplating during the Mesozoic era,related to the lithospheric thinning in North China craton.
The seismic tomography can provide both fine P-wave and S-wave velocity structures of the crust and upper mantle,and also a Poisson's ratio image from the seismic velocities via proper computation.However,it is unsure that Poisson's ratio images have any advantages comparing with the P-wave and S-wave velocity images.In this study,the high resolution seismic tomography is applied to the determination of detailed 3-D crustal P-and S-wave seismic velocities structure as well as Poisson's ratio images under the eastern part of North China region.Results of Poisson's ratio imaging show a high Poisson's ratio(high-PR)anomalies located in Hengshan-North Taihang-Zhangjiakou(H-NT-Z)region,showing Poisson's ratio imaging can provide new geophysical constraints for the regional tectonic evolution.H-NT-Z region shows prominent and continuous high-PR anomalies in upper crust,extending down to the middle crust with thickness up to about 26 km.According to petrophysical property measurements and other geological data,this crustal Poisson's ratio anomaly may be explained by the upper mantle partial melting and basaltic magma underplating during the Mesozoic era,related to the lithospheric thinning in North China craton.
引文
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[14]嵇少丞,王茜,杨文采,等.华北克拉通泊松比与地壳厚度的关系及其大地构造意义[J].地质学报,2009,83(3):324-330.
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[17]Ji S C,Saruwatari K,Mainprice D,et al.Microstructure,petrofabrics and seismic properties of ultrahigh-pressure eclo-gites from Sulu Region,China:I mplications for rheology ofsubducted continental crust and origin of mantle reflections[J].Tectonophysics,2003,370:49-76.
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[20]Yang WC,Du J Y.Seismic scattering tomography with ap-plication to crustal investigations[J].Earthquake ResearchinChina,1992,6(2):221-239.
[21]Gercek H.Poisson’s ratio values for rocks[J].InternationalJournal of Rock Mechanics and Mining Sciences,2007,44:1-13.
[22]Yang WC,Chen Z D.Seismic multi-arch structures in EastChina[J].Science in China:Series D,2006,49(2):133-146.
[23]Yang W C,Jin Z M,Yu C Q.Seismic response to naturalgas anomalies in crystalline rocks[J].Science in China:Se-ries D,2008,51(12):1726-1736.
[24]白文吉,周美夫,胡旭峰,等.华北地块岩石圈构造演化与镁铁-超镁铁杂岩及矿化特征[M].北京:地震出版社,1993.
[25]杨文采,汪集?.苏鲁地区地壳岩浆底侵的地球物理判识[J].地质学报,2002,76(2):173-179.
[26]罗照华,邓晋福,韩秀卿.太行山造山带岩浆活动及其造山过程反演[M].北京:地质出版社,1999.
[2]杨文采,李幼铭.应用地震层析成像[M].北京:地质出版社,1993.
[3]刘福田,曲克信,吴华,等.华北地区的地震层析成像[J].地球物理学报,1986,29(5):442-449.
[4]Nolet G.Seismic Tomography with Application in GlobalSeismology and Exploration Geophysics[M].Dordrecht,Holland:Reidel Publishing Company,1987.
[5]Nolet G,Ziehuis A.Low S velocities under the Tornquist-Teisseyre zone:Evidence for water injection into the transi-tion zone by subduction[J].Journal of Geophysical Research,1994,99(B8):15813-15820.
[6]Zhao D,Hasegawa A,Horjuchi S.Tomographic i maging of Pand S wave velocity structure beneath Northeastern Japan[J].Journal of Geophysical Research,1992,97:19909-19928.
[7]黄金莉,赵大鹏.首都圈地区地壳三维P波速度细结构与强震孕育的深部构造环境[J].科学通报,2005,50(4):348-355.
[8]胥颐,刘建华,郝天珧,等.中国东部海域及邻区岩石层地幔的P波速度结构与构造分析[J].地球物理学报,2006,49(4):1053-1061.
[9]裴顺平,许忠淮,汪素云.中国大陆及邻近地区上地幔顶部Sn波速度层析成像[J].地球物理学报.2004,47(2):250-256.
[10]张学民,刁桂苓,赵英萍,等.华北地区深部地幔剪切波速度结构研究[J].地球物理学报,2006,49(6):1709-1719.
[11]杨文采,张学民,于常青.中国华北上地幔破裂带[J].地质学报,2007,81(10):1305-1313.
[12]嵇少丞,王茜,王勤,等.苏鲁—大别超高压变质岩的弹性力学性质与密度的关系[J].岩石学报,2007,23(12):3054-3064.
[13]许卫卫,郑天愉.渤海湾盆地北西盆山边界地区泊松比分布[J].地球物理学报,2005,48(5):1077-1084.
[14]嵇少丞,王茜,杨文采,等.华北克拉通泊松比与地壳厚度的关系及其大地构造意义[J].地质学报,2009,83(3):324-330.
[15]Ji S C,Wang Q,Xia B.Handbook of Seismic Properties ofMinerals,Rocks and Ores[M].Montreal:Polytechnic Inter-national Press,2002.
[16]Ji S C,Xia B.Rheology of Polyphase Earth Materials[M].Montreal:Polytechnic International Press,2002.
[17]Ji S C,Saruwatari K,Mainprice D,et al.Microstructure,petrofabrics and seismic properties of ultrahigh-pressure eclo-gites from Sulu Region,China:I mplications for rheology ofsubducted continental crust and origin of mantle reflections[J].Tectonophysics,2003,370:49-76.
[18]Ji S C,Salisbury M H.Shear-wave velocities,anisotropy andsplitting in the high grade mylonites[J].Tectonophysics,1993,221:453-473.
[19]Yang WC,Du J Y.Anewalgorithmof seismic tomographywith application to engineering detection[J].Chinese Journalof Geophysics,1994,37(2):331-338.
[20]Yang WC,Du J Y.Seismic scattering tomography with ap-plication to crustal investigations[J].Earthquake ResearchinChina,1992,6(2):221-239.
[21]Gercek H.Poisson’s ratio values for rocks[J].InternationalJournal of Rock Mechanics and Mining Sciences,2007,44:1-13.
[22]Yang WC,Chen Z D.Seismic multi-arch structures in EastChina[J].Science in China:Series D,2006,49(2):133-146.
[23]Yang W C,Jin Z M,Yu C Q.Seismic response to naturalgas anomalies in crystalline rocks[J].Science in China:Se-ries D,2008,51(12):1726-1736.
[24]白文吉,周美夫,胡旭峰,等.华北地块岩石圈构造演化与镁铁-超镁铁杂岩及矿化特征[M].北京:地震出版社,1993.
[25]杨文采,汪集?.苏鲁地区地壳岩浆底侵的地球物理判识[J].地质学报,2002,76(2):173-179.
[26]罗照华,邓晋福,韩秀卿.太行山造山带岩浆活动及其造山过程反演[M].北京:地质出版社,1999.
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