华北克拉通东部地壳和上地幔结构的接收函数研究
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摘要
利用北京大学和早期中国科学院地质与地球物理研究所在华北克拉通东部地区布设的共34台宽频带地震仪记录的远震体波资料,获取P波接收函数和S波接收函数,再分别通过偏移成像和共转换点叠加(CCP)和倾斜叠加得到了华北克拉通东部横跨郯庐断裂带地区沿剖面的地壳和上地幔速度间断面分布.研究结果表明,鲁西隆起下方的莫霍面的深度要比华北盆地和青岛地区浅约5km,形成类似屋顶状的莫霍面隆起.郯庐断裂带和聊考断裂带下方的莫霍面有明显的错断.岩石圈与软流圈的分界面(以下简称LAB)的深度从太行山山前的约100km深度上升到鲁西隆起下方约60km深,向东在青岛地区下方LAB深度进一步变浅.我们利用倾斜叠加计算台站下方波速比得到地壳内的泊松比变化,结果显示鲁西隆起泊松比值分布相对均匀,而青岛地区内泊松比变化剧烈,可能反应了该地区作为苏鲁大别超高压变质带的北缘经历了较为复杂的地质演化过程.
The P-wave and S-wave receiver function analysis has been performed along a profile which consists of 34 broadband seismographs to image the crustal and upper mantle structure in east part of North China Craton(NCC).The results reveal that the Moho interface lies at a depth of more than 30 km below the North China basin and shallows to less than 30 km in the West Shandong(Luxi) uplift which displays a dome-like shape.This Moho depth jump is roughly coincident with the transverse location of the Liaokao fault.An obvious uplift of the Moho is also detected below the Tanlu fault zone,which reflects that the fault may cut through the Moho under it.The lithosphere-asthenosphere boundary(LAB) is observed ～100 km beneath the Taihang orogenic belt and increases to ～60 km below the Luxi uplift.Farther eastward,it seems to be shallower beneath the Qingdao region.We also apply the slant-stack method to determine Poisson′s ratio.The result shows rather uniform distribution of Poisson′s ratio in the Luxi uplift.In contrast,it is much variable in the Qingdao region which is the north part of the Sulu-Dabie ultra-high-pressure metamorphic belt,implying a more complex evolution history.
The P-wave and S-wave receiver function analysis has been performed along a profile which consists of 34 broadband seismographs to image the crustal and upper mantle structure in east part of North China Craton(NCC).The results reveal that the Moho interface lies at a depth of more than 30 km below the North China basin and shallows to less than 30 km in the West Shandong(Luxi) uplift which displays a dome-like shape.This Moho depth jump is roughly coincident with the transverse location of the Liaokao fault.An obvious uplift of the Moho is also detected below the Tanlu fault zone,which reflects that the fault may cut through the Moho under it.The lithosphere-asthenosphere boundary(LAB) is observed ～100 km beneath the Taihang orogenic belt and increases to ～60 km below the Luxi uplift.Farther eastward,it seems to be shallower beneath the Qingdao region.We also apply the slant-stack method to determine Poisson′s ratio.The result shows rather uniform distribution of Poisson′s ratio in the Luxi uplift.In contrast,it is much variable in the Qingdao region which is the north part of the Sulu-Dabie ultra-high-pressure metamorphic belt,implying a more complex evolution history.
引文
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[23]Wilson D,Aster R.Seismic imaging of the crust and uppermantle using regularized joint receiver functions,frequency-wave number filtering,and multimode Kirchhoff migration.Journal of Geophysical Research,2005,110:B05305,doi:10.1029/2004JB003430.
[24]Shapiro N M,Ritzwoller M H.Monte-Carlo inversion for aglobal shear-velocity model of the crust and upper mantle.Geophysical Journal International,2002,151(1):88-105.
[25]Zhao L,Zheng T Y,Xu W W.Modeling the Jiyangdepression,northern China,using a wave-field extrapolationfinite-difference method and waveform inversion.Bulletin ofthe Seismological Society of America,2004,94(3):988-1001.
[26]朱光,牛漫兰,宋传中等.郯庐断裂带新生代的上地幔剪切作用与火山活动.安徽地质,2001,11(2):106-112.Zhu G,Niu M L,Song Z Z,et al.Upper mantle shearingand volcanic activities along the Tan-lu fault zone inCenozoic.Geology of Anhui(in Chinese),2001,11(2):106-112.
[27]Zhu L P,Kanamori H.Moho depth variation in southernCalifornia from teleseismic receiver functions.Journal ofGeophysical Research,2000,105(B2):2969-2980.
[28]Owens T J,Zandt G.Implications of crustal propertyvariations for models of Tibetan plateau evolution.Nature,1997,387(6628):37-43.
[29]Zandt G,Ammon C J.Continental crust compositionconstrained by measurements of crustal Poisson′s ratio.Nature,1995,374(6518):152-154.
[30]许卫卫,郑天愉.渤海湾盆地北西盆山边界地区泊松比分布.地球物理学报,2005,48(5):1077-1084.Xu W W,Zheng T Y.Distribution of Poisson's ratios in thenorthwestern basin-mountain boundary of the Bohai BayBasin.Chinese Journal of Geophysics(in Chinese),2005,48(5):1077-1084.
[2]Ren J Y,Tamakib K,Li S,et al.Late Mesozoic andCenozoic rifting and its dynamic setting in Eastern China andadjacent areas.Tectonophysics,2002,344(3-4):175-205.
[3]Xu Y G,Chuang S L,Ma J L,et al.Contrasting Cenozoiclithospheric evolution and architecture in the western andeastern Sino-Korean craton:Constraints from geochemistryof basalts and mantle xenoliths.The Journal of Geology,2004,112(5):593-605.
[4]Gao S,Rudnick R L,Yuan H L,et al.Recycling lowercontinental crust in the North China craton.Nature,2004,432(7019):892-897.
[5]周新华.中国东部中、新生代岩石圈转型与减薄研究若干问题.地学前缘,2006,13(2).Zhou X H.Major transformation of subcontinentallithosphere beneath eastern China in the Cenozoic-Mesozoic:review and prospect.Earth Science Frontiers(in Chinese),2006,13(2):50-64.
[6]Chen L,Tao Wang,Zhao L,et al.Distinct lateral variationof lithospheric thickness in the northeastern North ChinaCraton.Earth and Planetary Science Letters,2008,267(1-2):56-68.
[7]吴福元,葛文春,孙德有等.中国东部岩石圈减薄研究中的几个问题.地学前缘,2003,10(3):51-60.Wu F Y,Ge W C,Sun D Y,et al.Discussions on thelithospheric thinning in eastern China.Earth ScienceFrontiers(in Chinese),2003,10(3):51-60.
[8]Menzies M A,Fan W M,Zhang M.Palaeozoic and Cenozoiclithoprobe and the loss of>120km of Archean lithosphere,Sino-Korean craon,China.//Magmatic processes and platetectonics.1993:10.
[9]吴福元,孙德有.中国东部中生代岩浆作用与岩石圈减薄.长春科技大学学报,1999,29(4):313-318.Wu F Y,Sun D Y.The Mesozoic magmatism andlithospheric thinning in eastern China.Journal ofChangchun University of Science and Technology(inChinese),1999,29(4):313-318.
[10]Xu Y G,Chung S L,Ma J L,et al.Contrasting Cenozoiclithospheric evolution and architecture in the western andeastern Sino-Korean Craton:constraints from geochemistryof basalts and mantle xenoliths.The Journal of Geology,2004,112(5):593-605.
[11]Chen L,Zheng T Y,Xu W W.A thinned lithospheric imageof the Tanlu Fault Zone,eastern China:Constructed fromwave equation based receiver function migration.Journal ofGeophysical Research,2006,111:B09312,doi:10.1029/2005JB003974.
[12]Langston C A.Structure under mount rainier,Washington,inferred from teleseismic body waves.Journal of GeophysicalResearch,1979,84(Nb9):4749-4762.
[13]Yuan X H,Kind R,Li X Q,et al.The S receiver functions:synthetics and data example.Geophysical Journal International,2006,165(2):555-564.
[14]Dueker K G,Sheehan A F.Mantle discontinuity structurefrom midpoint stacks of converted P to S waves across theYellowstone hotspot track.Journal of Geophysical Research,1997,102(B4):8313-8327.
[15]李理,钟大赉,时秀朋.鲁西隆起和济阳凹陷新生代隆坳耦合关系.地质学报,2007,81(9):1215-1228.Li L,Zhong D L,Shi X P.Cenozoic uplifting/subsidencecoupling between the West Shandong Rise and the JiyangDepression,Northern China.Acta Geologica Sinica(inChinese),2007,81(9):1215-1228.
[16]张锡明,张岳桥,季玮.山东鲁西地块断裂构造分布型式与中生代沉积-岩浆-构造演化序列.地质力学学报,2007,13(2):163-172.Zhang X M,Zhang Y Q,Ji W.Fault distribution patterns ofthe Luxi block,Shandong,and Mesozoic sedimentary-magmatic-structural evolution sequence.Journal of Geomechanics(in Chinese),2007,13(2):163-172.
[17]邱瑞照,邓晋福,周肃等.华北地区岩石圈类型:地质与地球物理证据.中国科学D辑地球科学,2004,34(8):698-711.Qiu R Z,Deng J F,Zhou S,et al.Lithosphere types inNorth China-Evidences from geology and geophysics.Sciencein China(Ser.D),2005,48(11):1809-1827.
[18]牛树银,胡华斌,毛景文等.鲁西地区地质构造特征及其形成机制.中国地质,2004,31(1):34-39.Niu S Y,Hu H B,Mao J W,et al.Structure in westernShandong and its genetic mechanism.Acta Geologica Sinica(in Chinese),2004,31(1):34-39.
[19]许志琴,张泽明,刘福来等.苏鲁高压-超高压变质带的折返构造及折返机制.地质学报,2003,77(4):433-450.Xu Z Q,Zhang Z M,Liu F L,et al.Exhumation structureand mechanism of the Sulu ultrahigh-pressure metamorphicbelt,Central China.Acta Geologica Sinica(in Chinese),2003,77(4):433-450.
[20]杨文采,程振炎,陈国九等.苏鲁超高压变质带北部地球物理调查(I)——深反射地震.地球物理学报,1999,42(1):41-52.Yang W C,Cheng Z Y,Chen G J,et al.Ceophysicalinvestigations in northern Sulu UHPM belt,part I:deepseismic reeflection.Chinese J.Geophys.(in Chinese),1999,42(1):41-52.
[21]Ligorría J P,Ammon C J.Iterative deconvolution andreceiver-function estimation.Bulletin of the SeismologicalSociety of America,1999,89(5):1395-1400.
[22]Kennett B L N.The removal of free surface interactions fromthree-component seismograms.Geophysical Journal International,1991,104(1):153-154.
[23]Wilson D,Aster R.Seismic imaging of the crust and uppermantle using regularized joint receiver functions,frequency-wave number filtering,and multimode Kirchhoff migration.Journal of Geophysical Research,2005,110:B05305,doi:10.1029/2004JB003430.
[24]Shapiro N M,Ritzwoller M H.Monte-Carlo inversion for aglobal shear-velocity model of the crust and upper mantle.Geophysical Journal International,2002,151(1):88-105.
[25]Zhao L,Zheng T Y,Xu W W.Modeling the Jiyangdepression,northern China,using a wave-field extrapolationfinite-difference method and waveform inversion.Bulletin ofthe Seismological Society of America,2004,94(3):988-1001.
[26]朱光,牛漫兰,宋传中等.郯庐断裂带新生代的上地幔剪切作用与火山活动.安徽地质,2001,11(2):106-112.Zhu G,Niu M L,Song Z Z,et al.Upper mantle shearingand volcanic activities along the Tan-lu fault zone inCenozoic.Geology of Anhui(in Chinese),2001,11(2):106-112.
[27]Zhu L P,Kanamori H.Moho depth variation in southernCalifornia from teleseismic receiver functions.Journal ofGeophysical Research,2000,105(B2):2969-2980.
[28]Owens T J,Zandt G.Implications of crustal propertyvariations for models of Tibetan plateau evolution.Nature,1997,387(6628):37-43.
[29]Zandt G,Ammon C J.Continental crust compositionconstrained by measurements of crustal Poisson′s ratio.Nature,1995,374(6518):152-154.
[30]许卫卫,郑天愉.渤海湾盆地北西盆山边界地区泊松比分布.地球物理学报,2005,48(5):1077-1084.Xu W W,Zheng T Y.Distribution of Poisson's ratios in thenorthwestern basin-mountain boundary of the Bohai BayBasin.Chinese Journal of Geophysics(in Chinese),2005,48(5):1077-1084.
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