全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...

帕米尔东北缘地壳结构的P波接收函数研究

DOI: 10.6038/cjg20141007, PP. 3176-3188

Keywords: 地壳厚度,泊松比,壳内间断面埋深,接收函数,帕米尔东北缘

Full-Text   Cite this paper   Add to My Lib

Abstract:

利用位于新疆帕米尔东北缘地带12个固定数字地震台和天山动力学Ⅱ期10个流动宽频带数字地震台记录的高质量远震波形数据,应用接收函数H-κ叠加方法研究了帕米尔东北缘的地壳厚度-泊松比特征和部分台站下方的壳内界面深度.研究发现:(1)帕米尔东北缘的Moho面起伏变化剧烈,其总体分布呈现东薄西厚、南厚北薄的特征,由塔里木盆地向天山延伸,地壳厚度约从45km加深到55km,从塔里木盆地向西昆仑山延伸,地壳厚度约从45km加深到69km;(2)沿着天山动力学Ⅱ期剖面,位于塔里木盆地北缘台站的壳内间断面的深度约为13~16km,向北进入天山南麓加深到20km左右,继续向北进入南天山山区壳内间断面不明显,可能暗示塔里木盆地基底向北俯冲,俯冲距离可能到达南天山的山前;(3)研究区地壳泊松比变化复杂(约从0.20到0.31),显示地壳物质组成的复杂性和显著的不均匀构造;(4)整个研究区的地壳厚度和泊松比之间没有明显的相关性,但天山动力学Ⅱ期剖面的结果表明,从塔里木盆地北缘到西南天山,地壳厚度和泊松比之间存在反相关关系,意味着天山地壳的增厚可能主要是通过以长英质岩石为主要组成成分的上地壳叠置而成;(5)研究区全部地震台地壳厚度与海拔高程的线性回归方程表明地壳厚度与海拔的相关性相对较弱(相关系数为0.66),天山动力学Ⅱ期10个台站的地壳厚度与海拔具有很好的相关性(相关系数为0.85),可能表明沿该剖面地壳整体上处于相对均衡的状态.

References

[1]  Burtman V S,Molnar P.1993. Geological and geophysical evidence for deep subduction of continental crust beneath the Pamir.Geological Society of America Special Paper,281:1-76.
[2]  Chen J H. 2007.Teleseismic receiver function: theory and applications. Doctor Paper,Institute of Geology CEA 74-89.
[3]  Li S B. 1981. Earthquake China (in Chinese). Beijing:Seismological Press.
[4]  LI Zhi Wei, XU Yi, Steven W Roecker, et al. 2007. Pn wave velocity structure and anisotropy in the central Tien Shan region. Chinese J.Geophys. (in Chinese), 50(4): 1066-1072.
[5]  Li Zhiwei, Steve Roecker, Li Zhihai, et al. 2009. Tomographic image of the crust and upper mantle beneath the western Tien Shan from the MANAS broadband deployment: Possible evidence for lithospheric delamination. Tectonophysics, doi:10.1016/j.tecto.2009.05.007
[6]  Ligorra J P, Ammon C J. 1999. Iteraive deconvolution and receiver-function estimation. Bull Seism Soc Am, 89,1395-1400.
[7]  Liu J, Liu Q, Guo B, Yuen D A, et al. 2007. Small-scale convection in the upper mantle beneath the Chinese Tian Shan Mountains. Phys. Earth Plant. Int. 163:179-190.
[8]  Liu Q Y, Chen J H, Li S C, et al. 2000. Passive seismic experiment in Xinjiang-Jiashi strong earthquake region and discussion on its seismic genesis. Chinese J. Geophys. (in Chinese), 43(3): 356-365.
[9]  Lu X B, Shi Y, Tian C L. 1995.Tectonic electrical characteristics and Amodel subducting patterns of southerwest Tarim basin-west Kunlun area. Experimental Petroleum Geology (in Chinese), 17(3):238-248.
[10]  Makarov V I, Alekseev D V, Batalev V Y, et al. 2010.Underthrusting of Tarim beneath the Tien Shan and deep structure of their junction zone:Main results of seismic experiment along MANAS profile Kashger-Song-Kol. Geotectonics, 44(2):102-126.
[11]  Molnar P,Tapponnier P.1975. Cenozoic tectonics of Asia:Efects of a continental collision. Science,189:419-426.
[12]  Negredo A M,Replumaz A, Villasefior A,et al.2007. Modeling the evolution of continental subduction processes in the Pamir Hindu Kush region.Earth and Planetary Science Letters,259(1):212-225.
[13]  Tang M S,Ge C,Zheng Y,et al. 2013.Feasibility analysis of short-period seismograph receiver function-take the Hotan Seismic Array as example,Xinjiang. Chinese J. Geophys. (in Chinese), 56(8):2670-2680.
[14]  Vergolle M,Calais E,Dong L. 2007. Dynamics of continental deformation in Asia. J. Geophys. Res. 112, B11403, doi:10.1029/2006JB004807.
[15]  Vinnika L P, Reigber C, Aleshina et al. 2004.Receiver function tomography of the central Tien Shan. Earth and Planetary Science Letters, 225:131-146.
[16]  Wang Q, Ding G Y, Qiao X J,et al. 2000. Rapid crustal shortening and relative motion of crustal blocks in the Tienshan. Chinese Science Bulletin (in Chinese), 45(14):1543-1547.
[17]  Wolfe C J, Vernon F L. 1998. Shear-wave splitting at central Tien Shan: evidence for rapid variation of anisotropic patterns. Geophys. Res. Lett., 25:1217-1220.
[18]  Xiong X S, Gao R, Li Q S, et al. 2010. The Moho depth of Northwest China revealed by seismic detection. Acta Geoscientica Sinica, 31(1):23-31.
[19]  Xu Y, Steven W Roecker, Wei R P, et al. 2005. Analysis of seismic activity in the crust from earthquake relocation in the Central Tian Shan. Chinese J. Geophys. (in Chinese), 48(6): 1308-1315.
[20]  Yang H, Teng J W, Zhang X M, et al. 2009. Numerical simulation on lithospheric evolution of the Himalayan Western Syntaxis with 3-D finite element method. Chinese J. Geophys. (in Chinese), 52(12):3009-3019.
[21]  Yang Z X, Zhang X K, Jia S X, et al. 2006. Fine crustal structure around the Jiashi earthquake swarm region by deep seismic reflection profiling. Chinese J. Geophys. (in Chinese), 49(6):1701-1708.
[22]  Zhang X K, Zhao J R, Zhang C K, et al. 2002. Crust al structure at the Northeast side of the Pamirs. Chinese J. Geophys.(in Chinese), 45(5): 665- 671.
[23]  Zhao C P. 2006. Seismological studies on the characteristics of Jashi source region from 1997 to 2003. Beijing: Institute of Geophysics, China Earthquake Administration, 1-58.
[24]  Zhu L P,Kanamori H. 2000. Moho depth variation in Southern California from teleseismic receiver functions.J Geophys Res,105:2969-2980.
[25]  Avouac J P,Tapponnier P.1993. Kinematic model of active deformation in Central Asia.Geophysical Research Letters,20(10):895-898.
[26]  Burov V, Kogan M, Lyon-Caen H,et al. 1990. Gravity anomalies, the deep structure, and dynamics processes beneath the Tien Shan. Earth Planet. Sci. Lett. 96, 367-383.
[27]  Burtman V S.2000. Cenozoic crustal shortening between the Pamir and Tien Shan and a reconstruction of the Pamir-Tien Shan transition zone for the Cretaceous and Palaeogene. Tectonophysics,319(2):69-92.
[28]  Christensen N I. 1996. Poisson''s ratio and crustal seismology. J. Geophys.Res., 101, 3139-3156.
[29]  Duan Y H, Zhang X K, Yang Z X. 2002. Study on basement structures of the northeast P amirs. Acta Seismologica Sinica, 24(4):378-384.
[30]  Ge C, Zheng Y, Xiong X. 2011.Study of crustal thickness and Poisson ratio of the North China Craton. Chinese J. Geophys. (in Chinese), 54(10):2538-2548.
[31]  He H S, Gao R, He R Z, et al. 2012. Shallow-deep tectonic relationship for the junction belt of western part of South Tianshan and Tarim basin-Revealed from preliminary processed deep seismic reflection profile. Chinese J. Geophys. (in Chinese), 55(12):4116-4125.
[32]  Ji S C, WANG Qian, Salisbury M H. 2009. Composition and tectonic evolution of the Chinese continental crust constrained by Poisson''s ratio. Tectonophysics, 463(1-4): 15-30.
[33]  Ji S C, Wang Q, Yang W C. 2009. Correlation between crustal thickness and Poisson''s ratio in the North China Craton and its implication for lithospheric thinning. Acta Geologica Sinica, 83(3):324-330.
[34]  Jiang L J,Li Y H,Wu Q J. 2010. The shear wave splitting of Central Tien Shan and its implications. Chinese J. Geophys. (in Chinese), 53(6): 1399-1408.
[35]  Kosarev G L, Petersen N V, Vinnik L P, et al. 1993. Receiver functions for the Tien Shan analog broadband network:Contrasts in the evolution of structures across the Talasso-Fergana fault. J Geophys Res, 98,B3,4437-4448.
[36]  Kumar P, Yuan X, Kind R,et al. 2005. The lithosphere-asthenosphere boundary in the Tien Shan-Karakoram region from S receiver functions: Evidence for continental subduction. Geophys. Res. Lett., 32, L07305, doi:10.1029/2004GL022291.
[37]  Langston C A. 1979. Structure under Mount Rainier, Washington, inferred from teleseismic body waves. J Geophys Res., 84,B4,4749-4762.
[38]  Lei J S, Zhou H L, Zhao D P. 2002. 3-D velocity structure of P-wave in the crust and upper-mantle beneath Pamir and adjacent region. Chinese J. Geophys. (in Chinese), 45(6):802-813.
[39]  Lei J, Zhao D. 2007.Teleseismic P-wave tomography and the upper mantle structure of the central Tien Shan orogenic belt. Physics of the Earth and Planetary Interiors, 162:165-185.
[40]  Liu W X, Liu G Z, Zhou G, et al. 2011. Crustal thickness and VP/VS ratio variations of Xinjiang and surrounding regions constrained by receiver function stacking. Chinese J. Geophys. (in Chinese), 54(8):2034-2041.
[41]  Liu Z, Zhang X K, Zhou X S, et al. 2003. Study of crustal structure in terms of physical property and discussion on seismogenic environment in the northeastern Pamirs. Acta Seismologica Sinica, 25(3):242-249.
[42]  Lyon C H, Molnar P. 1984. Gravity anomalies and the structure of western Tibet and the southern Tarim basin. Geophys. Res. Lett., 11(12):1251-1254.
[43]  Makeyeva L I, Vinnik L P, Roecker S W. 1992.Shear-wave splitting and small-scale convection in the continent upper mantle. Nature, 358:144-147.
[44]  Pan S Z, Zhang X K, Yang Z X, et al. 2007.Tomographic determination of the upper crustal structure in Jiashi strong earthquake swarm region—joint inversion of explosion and earthquake data. Chinese J. Geophys. (in Chinese),50(5):1456-1463.
[45]  Shi Y L,Zhu S B. 2003. Contrast of rheology in the crust and mantle near moho revealed by depth variation of earthquake mechanism in continental China. Chinese Journal of Geophysic. 46(3):359-365.
[46]  Sobel E R,Dumitru T A. 1997. Thrusting and exhumation around the margins of the western Tarim Basin during the India-Asia collision.Journal of Geophysical Research,102(B3):5043-5063.
[47]  Tang M S, Wang H T, Luo J, et al. 2013. Study on crustal structure beneath Bachu and Taxkorgan seismic stations in Xinjiang. Inland Earthquake (in Chinese), 27(1):7-14.
[48]  Tian X, Zhao D, Zhang H, et al, 2010. Mantle transition zone topography and structure beneath the central Tien Shan orogenic belt. J. Geophys. Res., 115, B10308, doi:10.1029/2008JB006229.
[49]  Xu Y, Liu J H, Liu F T, et al. 2006. Crustal velocity structure and seismic activity in the Tianshan-Pamir conjunctive zone. Chinese J. Geophys. (in Chinese), 49(2): 469-476.
[50]  Youlin Chen, Fenglin Niu, et al. 2010.Crustal structure beneath China from receiver function analysis. J Geophys Res. 115:B03307:1978-2012.
[51]  Zandt G, Ammon C J. 1995. Continental crust composition constrained by measurements of crusta1 Poisson''s ratio.Nature, 374:152-154.
[52]  Zhang P Z,Deng Q D,Yang X P. 1996.Late Cenozoic tectonic deformation and mechanism along the Tianshan Mountain,North Western China. Earthquake Research in China, 12(2):127-140

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133