用户名: 密码: 验证码:
秦岭造山带与南北相邻地带远震接收函数与地壳结构
详细信息    查看全文 | 推荐本文 |
  • 英文篇名:Crust structure of the Qinling orogenic and the region on its north and south margins from teleseismic receiver function
  • 作者:司芗 ; 滕吉文 ; 刘有山 ; 马学英 ; 乔勇虎 ; 董兴鹏 ; 宋鹏汉
  • 英文作者:SI Xiang;TENG Ji-Wen;LIU You-Shan;MA Xue-Ying;QIAO Yong-Hu;DONG Xing-Peng;SONG Peng-Han;Institute of Geology and Geophysics,Chinese Academy of Sciences;University of Chinese Academy of Sciences;Strategic Research Center of Oil & Gas Resources,Ministry of Land & Resources;
  • 关键词:秦岭造山带及其南北缘 ; 远震P波接收函数 ; H-κ叠加 ; CCP偏移叠加 ; 地壳厚度 ; 泊松比 ; 构造界带
  • 英文关键词:Qinling orogenic belt;;Teleseismic P wave receiver function;;H-κ stacking;;CCP stacking;;Crust thickness;;Poisson′s ratio;;Tectonic zone
  • 中文刊名:DQWX
  • 英文刊名:Chinese Journal of Geophysics
  • 机构:中国科学院地质与地球物理研究所;中国科学院大学;国土资源部油气资源战略研究中心;
  • 出版日期:2016-04-15
  • 出版单位:地球物理学报
  • 年:2016
  • 期:v.59
  • 基金:国家自然科学基金项目(90914012)资助
  • 语种:中文;
  • 页:DQWX201604014
  • 页数:14
  • CN:04
  • ISSN:11-2074/P
  • 分类号:167-180
摘要
从2013年3月至2014年11月,我们布设了一条延川—涪陵的流动宽频带地震台阵,剖面由70个流动台站组成,全长约900km,穿越华北克拉通、秦岭—大巴造山带和扬子克拉通东北缘陆内三大构造单元.利用记录到的远震波形资料,提取得到5638个远震P波接收函数,使用H-κ叠加扫描和CCP偏移叠加方法刻划了秦岭造山带与南北相邻地带的地壳厚度、泊松比以及构造界带.研究结果显示,(1)关于地壳厚度:地壳最厚的区域出现在大巴山,地壳厚度集中在47~51km之间,秦岭的地壳厚度相对大巴山较薄,且呈向北减薄趋势,集中在37~46km之间,渭河盆地地壳厚度为本区域最薄地带,在34°N左右处达到最薄为35km,剖面北侧的南鄂尔多斯盆地的地壳厚度变化缓慢,多为44km左右,南侧的四川盆地东北缘的地壳厚度向南缓慢减薄,集中在42~48km之间;(2)关于泊松比:使用接收函数H-κ叠加扫描法得到了沿剖面各台站下方地壳的平均纵、横波速度比VP/VS(κ),进一步计算得到泊松比σ,泊松比具有明显的横向分块特征,秦岭造山带的泊松比明显低于南北两侧区域,其小于0.26的泊松比表征着该区域地壳物质组分主要为酸性岩石,亦即其酸性长英质组分上地壳相对于基性铁镁质组分下地壳较厚,该区域没有高泊松比分布则表明不存在广泛的部分熔融.(3)关于构造界带:秦岭—大巴造山带与扬子克拉通的边界并非在勉略构造带,应向南移至四川盆地的东北缘,华北克拉通和扬子克拉通分踞秦岭—大巴造山带南、北两侧,且分别以较陡倾角向南和相对较缓的倾角向北俯冲于秦岭—大巴造山带之下,使得秦岭—大巴造山带呈不对称状扇形向外扩展与向上抬升的空间几何模型.秦岭和大巴山之间33°N附近存在分界面,两区域地壳厚度与泊松比特征各异.
        Qinling-Daba orogenic belt is located between North China craton and the Yangtze craton in an EW narrow zone.As an important part of the central orogenic belt,it is a uniquecomplex typical continental orogenic belt.Studying its crust structure plays an important role for understanding and discussing the interaction among Mainland China blocks.From March 2013 to November 2014,one seismic profile was deployed crossing the North China craton,Qinling-Daba orogenic belt,and the Yangtze craton,which covered about 900 km from Yanchuan to Fulin and included 70 mobile stations.5638 teleseismic P wave receiver functions were extracted from the waveforms.H-κauto-searching stacking and CCP stacking methods were used to study the crust structure beneath the Qinling orogenic belt and the adjacent north and south zones.Crustal thickness along the profile was obtained by H-κand CCP stacking methods.The average crust velocity ratio VP/VS(κ)beneath each station along the profile was gained by using receiver function H-κstacking method and then the Poisson′s ratio was calculated.The Poisson′s ratio has obvious regional distribution characteristic.Through the CCP stacking methods,the tectonic zone along the profile may be recognized and analyzed.The results indicated,(1)About the crustal thickness:Crustal thickness along Daba mountain is the thickest,which is around 47~51km.While going to the Qinling the thickness becomes thinner,which is around 37~46km.The Weihe basin reaches the thinnest(around 35km)at 34°N.On the north side of profile,i.e.,the south Erdos basin,the crust thickness fluctuates slowly,mostly about 44 km.The thickness of the Sichuan basin northeast margin becomes thinner slowly heading south,mostly about 42~48km.(2)About the Poisson′s ratio:The Poisson′s ratio of Qinling orogenic belt is significantly lower than that of southern and northern area.Qinling′s Poisson′s ratio is less than 0.26,which means that its main crust components are acidic rocks,and its felsic upper crust is thicker than its mafic lower crust.There isn′t high Poisson′s ratio in Qinling orogenic belt,this shows that there is no extensive partial fusion.(3)About tectonic zone:The boundary between Qinling-Daba orogenic belt and the Yangtze craton is not in the Mianlue structure zone,it should migrate southward to the northeast margin of the Sichuan Basin.North China craton and Yangtze craton is located in the north and south side of Qinling-Daba orogenic belt.They subducted respectively southward and northward with steep and moderate dip along the Qinling-Daba orogenic belt,which made Qinling-Daba orogenic belt an extending outward uplift asymmetric geometry sector model.There is an interface near 33°N between Qinling and Daba Mountain,their regional crustal thickness and Poisson′s ratio have different characteristics.
引文
Ammon C J.1991.The isolation of receiver effects from teleseismic P waveforms.Bull.Seismol.Soc.Am.,81(6):2504-2510.
    Chen J H,Liu Q Y,Li S C,et al.2005.Crust and upper mantle S-wave velocity structure across Northeastern Tibetan Plateau and Ordos block.Chinese J.Geophys.(in Chinese),48(2):333-342.
    Cheng S Y,Zhang G W,Li L.2003.Lithospheric electrical structure of the Qinling orogen and its geodynamic implication.Chinese J.Geophys.(in Chinese),46(3):390-397.
    Gao R,Dong S W,He R Z,et al.2004.Subduction process of the Yangtze continental block from Moho reflection image,South China.Earth Science Frontiers(in Chinese),11(3):43-49.
    Hu G Z,Teng J W,Ruan X M,et al.2014.Magnetic anomaly characteristics and crystalline basement variation of the Qinling orogenic belt and its adjacent areas.Chinese J.Geophys.(in Chinese),57(2):556-571,doi:10.6038/cjg20140220.
    Ji S C,Wang Q,Salisbury M H.2009.Composition and tectonic evolution of the Chinese continental crust constrained by Poisson′s ratio.Tectonophysics,463(1-4):15-30.
    Kennett B L N,Engdahl E R.1991.Traveltimes for global earthquake location and phase identification.Geophys.J.Int.,105(2):429-465.
    Li Z K,Ding Y Y.2007.A tentative discussion on characteristics of the Daba mountain nappe structure.Geophysical&Geochemical Exploration(in Chinese),31(6):495-498.
    Ligorria J P,Ammon C J.1999.Iterative deconvolution and receiverfunction estimation.Bull.Seismol.Soc.Am.,89(5):1395-1400.
    Liu J H,Liu F T,Sun R M,et al.1995.Seismic tomography beneath the Qinling-Dabie orogenic belts and both the northern and southern fringes.Acta Geophysica Sinica(in Chinese),38(1):46-54.
    Liu Q M,Zhao J M,Lu F,et al.2014.Crustal structure of northeastern margin of the Tibetan Plateau by receiver function inversion.Science China:Earth Sciences(in Chinese),57:741-750,doi:10.1007/s11430-013-4772-5.
    Sun S.1985.Precambrian Geological Evolution in Southern North China Block Area(in Chinese).Beijing:Metallurgical Industry Press.
    Teng J W,Li S L,Zhang Y Q,et al.2014a.Seismic wave fields and dynamical response for Qinling orogen and sedimentary basins and crystalline basement.Chinese J.Geophys.(in Chinese),57(3):770-788,doi:10.6038/cjg20140308.
    Teng J W,Li S L,Zhang Y Q,et al.2014b.Fine velocity structures and deep processes in crust and mantle of the Qinling orogenic belt and the adjacent North China craton and Yangtze craton.Chinese J.Geophys.(in Chinese),57(10):3154-3175,doi:10.6038/cjg20141006.
    Wang Q S,Teng J W,Zhang Y Q,et al.2013a.Discussion on gravity anomalies and crustal structure of the Middle Qinling Mountains.Chinese J.Geophys.(in Chinese),56(12):3999-4008,doi:10.6038/cjg20131206.
    Wang Q S,Teng J W,Zhang Y Q,et al.2013b.Discussion on the special gravity field across the north part of Middle Qinling Mt..Chinese J.Geophys.(in Chinese),56(3):792-798,doi:10.6038/cj90130308.
    Wu Y.2011.The structure of the crust and upper mantle in North China craton from teleseismic receiver function[Ph.D.thesis](in Chinese).Beijing:Institute of Geophysics,China Earthquake Administration.
    Xu Q,Zhao J M,Cui Z X,et al.2009.Structure of the crust and upper mantle beneath the southeastern Tibetan Plateau by Pand S receiver functions.Chinese J.Geophys.(in Chinese),52(12):3001-3008,doi:10.3969/j.issn.0001-5733.2009.12.009.
    Xu T,Wu Z B,Zhang Z J,et al.2014.Crustal structure across the Kunlun fault from passive source seismic profiling in east Tibet.Tectonophysics,627:98-107.
    Ye Z,Li Q S,Gao R,et al.2013.Seismic receiver functions revealing crust and upper mantle structure beneath the continental margin of southeastern China.Chinese J.Geophys.(in Chinese),56(9):2947-2958,doi:10.6038/cjg20130909.
    Yuan X C,Xu M C,Tang W B,et al.1994.Eastern Qinling seismic reflection profiling.ActaG eophysica Sinica(in Chinese),37(6):749-758.
    Yuan X H,Ni J,Kind R,et al.1997.Lithospheric and upper mantle structure of southern Tibet from a seismological passive source experiment.J.Geophys.Res.,102(B12):27491-27500.
    Zhang G W,Bai Y B,Sun Y,et al.1985.Composition and evolution of the Archaean crust in central Henan,China.Precambrian Research,27(1-3):7-35.
    Zhang G W,Mei Z C,Zhou D W,et al.1988.Formation and Evolution of the Qinling Orogenic Belt(in Chinese).Xi′an:Northwest University Press,1-16.
    Zhang G W.1991.A discussion on basic features of tectonic development of lithosphere of the Qinling belt.Journal of Northwest University(in Chinese),21(2):77-87.
    Zhang G W,Meng Q R,Lai S C.1995a.Structure of Qinling orogenic belt.Science China(B)(in Chinese),25(9):994-1003.
    Zhang G W,Zhang Z Q,Dong Y P.1995b.Nature of main tectonolithostratigraphic units of the Qinling orogen:implications for the tectonic evolution.Acta Petrologica Sinica(in Chinese),11(2):101-114.
    Zhang G W,Dong Y P,Yao A P.1997.The crustal compositions,structures and tectonic evolution of the Qinling orogenic belt.Geology of Shaanxi(in Chinese),15(2):1-14.
    Zhang G W,Zhang B R,Yuan X C,et al.2001.Qinling Orogenic Belt and Continental Dynamics(in Chinese).Beijing:Science Press.
    Zhang Y Q.2013.The crustal structure beneath the Ordos basin and the orogens on its north and south margins[Post Doctor Research Report](in Chinese).Beijing:Institute of Geology and Geophysics,Chinese Academy of Sciences.
    Zhou D W,Li W H,Zhang Y X,et al.2002.The Method and Practice of Regional Geological Comprehensive Study(in Chinese).Beijing:Science Press.
    Zhu L P.2000.Crustal structure across the San Andreas Fault,southern California from teleseismic converted waves.Earth and Planetary Science Letters,179(1):183-190.
    Zhu L P,Kanamor H.2000.Moho depth variation in southern California from teleseismic receiver functions.J.Geophys.Res.,105(B2):2969-2980.
    Zhu L P.2002.Deformation in the lower crust and downward extent of the San Andreas Fault as revealed by teleseismic waveforms.Earth Planets Space,54(11):1005-1010.
    陈九辉,刘启元,李顺成等.2005.青藏高原东北缘-鄂尔多斯地块地壳上地幔S波速度结构.地球物理学报,48(2):333-342.
    程顺有,张国伟,李立.2003.秦岭造山带岩石圈电性结构及其地球动力学意义.地球物理学报,46(3):390-397.
    高锐,董树文,贺日政等.2004.莫霍面地震反射图像揭露出扬子陆块深俯冲过程.地学前缘,11(3):43-49.
    胡国泽,滕吉文,阮小敏等.2014.秦岭造山带和邻域磁异常特征及结晶基底变异分析.地球物理学报,57(2):556-571,doi:10.6038/cjg20140220.
    李占奎,丁燕云.2007.大巴山推覆构造特征的探讨.物探与化探,31(6):495-498.
    刘建华,刘福田,孙若昧等.1995.秦岭-大别造山带及其南北缘地震层析成像.地球物理学报,38(1):46-54.
    刘启民,赵俊猛,卢芳等.2014.用接收函数方法反演青藏高原东北缘地壳结构.中国科学:地球科学,44(4):668-679,doi:10.1007/s11430-013-4772-5.
    孙枢.1985.华北断块区南部前寒武纪地质演化.北京:冶金工业出版社.
    滕吉文,李松岭,张永谦等.2014a.秦岭造山带与沉积盆地和结晶基底地震波场及动力学响应.地球物理学报,57(3):770-788,doi:10.6038/cjg20140308.
    滕吉文,李松岭,张永谦等.2014b.秦岭造山带与邻域华北克拉通和扬子克拉通的壳幔精细速度结构与深层过程.地球物理学报,57(10):3154-3175,doi:10.6038/cjg20141006.
    王谦身,滕吉文,张永谦等.2013a.中秦岭地带重力异常特征及地壳结构的探榷.地球物理学报,56(12):3999-4008,doi:10.6038/cjg20131206.
    王谦身,滕吉文,张永谦等.2013b.中秦岭北侧特异重力场及其探榷.地球物理学报,56(3):792-798,doi:10.6038/cj90130308.
    武岩.2011.利用接收函数方法研究华北克拉通地壳上地幔结构[博士论文].北京:中国地震局地球物理研究所.
    徐强,赵俊猛,崔仲雄等.2009.利用接收函数研究青藏高原东南缘的地壳上地幔结构.地球物理学报,52(12):3001-3008,doi:10.3969/j.issn.0001-5733.2009.12.009.
    叶卓,李秋生,高锐等.2013.中国大陆东南缘地震接收函数与地壳和上地幔结构.地球物理学报,56(9):2947-2958,doi:10.6038/cjg20130909.
    袁学诚,徐明才,唐文榜等.1994.东秦岭陆壳反射地震剖面.地球物理学报,37(6):749-758.
    张国伟,梅志超,周鼎武等.1988.秦岭造山带的形成及其演化.西安:西北大学出版社,1-16.
    张国伟.1991.试论秦岭造山带岩石圈构造演化基本特征.西北大学学报,21(2):77-87.
    张国伟,孟庆任,赖绍聪.1995a.秦岭造山带的结构构造.中国科学(B辑),25(9):994-1003.
    张国伟,张宗清,董云鹏.1995b.秦岭造山带主要构造岩石地层单元的构造性质及其大地构造意义.岩石学报,11(2):101-114.
    张国伟,董云鹏,姚安平.1997.秦岭造山带基本组成与结构及其构造演化.陕西地质,15(2):1-14.
    张国伟,张本仁,袁学诚等.2001.秦岭造山带与大陆动力学.北京:科学出版社.
    张永谦.2013.鄂尔多斯与秦岭造山带地域的深部地壳结构[博士后出站报告].北京:中国科学院地质与地球物理研究所.
    周鼎武,李文厚,张云翔等.2002.区域地质综合研究的方法与实践.北京:科学出版社.

© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号

地址:北京市海淀区学院路29号 邮编:100083

电话:办公室:(+86 10)66554848;文献借阅、咨询服务、科技查新:66554700