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蒙古中南部地区面波相速度层析成像

DOI: 10.6038/cjg20150111, PP. 134-142

Keywords: 蒙古,相速度,面波层析成像,Rayleigh波

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Abstract:

本文采用小波变换频时分析技术提取了1893条蒙古中南部地区双台间基阶Rayleigh波相速度频散曲线,通过对提取到的相速度频散进行二维反演,首次重构了蒙古高原中南部10~80s周期内分辨率为0.5°×0.5°的相速度分布图.结果表明,短周期相速度频散(10~20s)明显受地表地形控制,表现为杭爱—肯特山盆地为相对高速异常,而南部的戈壁带表现为相对低速异常;在30s到60s周期内,南部的戈壁带和北部的杭爱—肯特山盆地都显示出稳定的高速异常,而中部戈壁带则表现为低速异常.该低速异常区与新生代火山岩出露位置的一致性,暗示该低速异常可能与新生代火山活动有关.穿过蒙古高原中部的两条主要断裂带与研究区内的地震波速度分布具有很好的一致性,可能暗示两条断裂带一直延伸到整个岩石圈.此外,蒙古中南部地区的壳幔速度低于全球平均大陆值,且其相速度频散曲线与遭受破坏的克拉通,尤其大陆裂谷很相似,可能暗示着研究区具有薄的、活跃的岩石圈构造.

References

[1]  He J, Wu Q J, Gao M T, et al. 2014. Crustal structure and Poisson ratio beneath the central and southern Mongolia derived from receiver functions. Chinese Journal Geophysics, 57(7): 2386-2394, doi: 10.6038/cjg20140732.
[2]  IAVCEI. 1973. Post-Miocene Volcanoes of the World. IAVCEI Data Sheets, Rome: International Association of Volcanology and Chemistry of the Earth''s Interior.
[3]  Khain V E. 1990. Origin of the Central Asian mountain belt: collision or mantle diapirism. Journal of Geodynamics, 11(4): 389-394.
[4]  Kiselev A I, Popov A M. 1992. Asthenospheric diapir beneath the Baikal rift: petrological constraints. Tectonophysics, 208(1): 287-295.
[5]  Koulakov I, Bushenkova N. 2010. Upper mantle structure beneath the Siberian craton and surrounding areas based on regional tomographic inversion of P and PP travel times. Tectonophysics, 486(1-4): 81-100.
[6]  Larson K M, Bürgmann R, Bilham R, et al. 1999. Kinematics of the India-Eurasia collision zone from GPS measurements. Journal of Geophysical Research: Solid Earth (1978—2012), 104(B1): 1077-1093.
[7]  Lebedev S, Meier T, van der Hilst R D. 2006. Asthenospheric flow and origin of volcanism in the Baikal Rift area. Earth Planet. Sci. Lett., 249(3-4): 415-424, doi: 10.1016/j.epsl.2006.07.007.
[8]  Li Y H, Wu Q J, Zhang R Q, et al. 2009. The lithospheric thinning of the North China Craton inferred from Rayleigh waves inversion. Geophysical Journal International, 177(3): 1334-1342.
[9]  Li Y H, Wu Q J, Pan J T, et al. 2013. An upper-mantle S-wave velocity model for East Asia from Rayleigh wave tomography. Earth Planet. Sci. Lett., 377-378: 367-377.
[10]  Molnar P, Tapponnier P. 1975. Cenozoic tectonics of Asia: effects of a continental collision. Science, 189(4201): 419-426.
[11]  Petit C, Koulakov I, Deverchère J. 1998. Velocity structure around the Baikal rift zone from teleseismic and local earthquake travel times and geodynamic implications. Tectonophysics, 296(1-2): 125-144.
[12]  Petit C, Déverchère J, Calais E, et al. 2002. Deep structure and mechanical behavior of the lithosphere in the Hangai-H?vsg?l region, Mongolia: new constraints from gravity modeling. Earth and Planetary Science Letters, 197(3-4): 133-149.
[13]  Petit C, Fournier M. 2005. Present-day velocity and stress fields of the Amurian Plate from thin-shell finite-element modelling. Geophys. J. Int., 160(1): 358-370.
[14]  Ritzwoller M H, Levshin A L. 1998. Eurasian surface wave tomography: Group velocities. Journal of Geophysical Research: Solid Earth (1978—2012), 103(B3): 4839-4878.
[15]  Si S K, Tian X B, Zhang H S, et al. 2012. Prevalent thickening and local thinning of the mantle transition zone beneath the Baikal rift zone and its dynamic implications. Science China: Earth Sciences, 42(11): 1647-1659.
[16]  Tapponnier P, Molnar P. 1979. Active faulting and Cenozoic tectonics of the Tien Shan, Mongolia, and Baykal regions. Journal of Geophysical Research: Solid Earth (1978—2012), 84(B7): 3425-3459.
[17]  Tian X B, Teng J W, Zhang H S, et al. 2011. Structure of crust and upper mantle beneath the Ordos Block and the Yinshan Mountains revealed by receiver function analysis. Physics of the Earth and Planetary Interiors, 184(3-4): 186-193.
[18]  Tiberi C, Deschamps A, Déverchère J, et al. 2008. Asthenospheric imprints on the lithosphere in Central Mongolia and Southern Siberia from a joint inversion of gravity and seismology (MOBAL experiment). Geophys. J. Int., 175(3): 1283-1297.
[19]  Wang H Z, He G Q, Zhang S H. 2006. The geology of China and Mongolia. Earth Science Frontiers,13(6): 1-13.
[20]  Whitford-Stark J L. 1987. A survey of Cenozoic volcanism on mainland Asia. Geol. Soc. Amer. Spec. Pap., 213: 1-74.
[21]  Windley B F, Allen M B. 1993. Mongolian plateau: Evidence for a late Cenozoic mantle plume under central Asia. Geology, 21(4): 295-298.
[22]  Wu Q J, Zhang X F, Pan J T, et al. 2009. Measurement of interstation phase velocity by wavelet transformation. Earthq. Sci., 22(4): 425-429.
[23]  Yanovskaya T B, Ditmar P G. 1990. Smoothness criteria in surface wave tomography. Geophys. J. Int., 102(1): 63-72.
[24]  Yi G X, Yao H J, Zhu J S, et al. 2008. Rayleigh-wave phase velocity distribution in China continent and its adjacent regions. Chinese Journal Geophysics, 51(2): 402-411:
[25]  Zhang J L, Tian X B, Zhang H S, et al. 2012. The crust and upper mantle anisotropy in Baikal Rift Zone and its dynamic significance. Chinese Journal Geophysics, 55(08): 2523-2538,doi: 10.6038/j.issn.0001-5733.2012.08.005.
[26]  Zhao D P, Lei J S, Inoue T, et al. 2006. Deep structure and origin of the Baikal rift zone. Earth Planet. Sci. Lett., 243(3-4): 681-691.
[27]  Zorin Y A, Kozhevnikov V M, Novoselova M R, et al. 1989. Thickness of the lithosphere beneath the Baikal rift zone and adjacent regions. Tectonophysics, 168(4): 327-337.
[28]  Zorin Y A, Turutanov E K, Mordvinova V V, et al. 2003. The Baikal rift zone: the effect of mantle plumes on older structure. Tectonophysics, 371(1-4): 153-173, doi: 10.1016/S0040-1951(03)00214-2.
[29]  Zorin Y A, Turutanov E K, Kozhevnikov V M, et al. 2006. Cenozoic upper mantle plumes in east Siberia and central Mongolia and subduction of the Pacific plate. Doklady Earth Sciences, 409(1): 723-726.
[30]  Adams A, Nyblade A, Weeraratne D. 2012. Upper mantle shear wave velocity structure beneath the East African plateau: evidence for a deep, plateauwide low velocity anomaly. Geophysical Journal International, 189(1): 123-142, doi: 10.1111/j.1365-246X.2012.05373.x.
[31]  Badarch G, Cunningham W D, Windley B F. 2002. A new terrane subdivision for Mongolia: implications for the Phanerozoic crustal growth of Central Asia. Journal of Asian Earth Sciences, 21(1): 87-110.
[32]  Barruol G, Deschamps A, Déverchere J, et al. 2008. Upper mantle flow beneath and around the Hangay dome, Central Mongolia. Earth and Planetary Science Letters, 274(1-2): 221-233, doi: 10.1016/j.epsl.2008.07.027.
[33]  Bayasgalan A, Jackson J, Ritz J F, et al. 1999. Field examples of strike-slip fault terminations in Mongolia and their tectonic significance. Tectonics, 18(3): 394-411.
[34]  Cunningham D. 2005. Active intracontinental transpressional mountain building in the Mongolian Altai: Defining a new class of orogen. Earth and Planetary Science Letters, 240(2): 436-444, doi: 10.1016/j.epsl.2005.09.013.
[35]  Cunningham W D, Windley B F, Dorjnamjaa D, et al. 1996. A structural transect across the Mongolian western Altai: active transpressional mountain building in central Asia. Tectonics, 15(1): 142-156.
[36]  Cunningham W D. 2001. Cenozoic normal faulting and regional doming in the southern Hangay region, Central Mongolia: implications for the origin of the Baikal rift province. Tectonophysics, 331(4): 389-411.
[37]  Ditmar P G, Yanovskaya T B. 1987. A generalization of the Backus-Gilbert method for estimation of lateral variations of surface wave velocity. Izv. Phys. Solid Earth, 23: 470-477.
[38]  Gao S, Davis P M, Liu H, et al. 1994. Seismic anisotropy and mantle flow beneath the Baikal rift zone. Nature, 371(6493): 149-151.
[39]  Gao S S, Liu K H, Davis P M, et al. 2003. Evidence for small-scale mantle convection in the upper mantle beneath the Baikal rift zone. Journal of Geophysical Research: Solid Earth, 108(B4), doi: 10.1029/2002JB002039.
[40]  Gao S S, Liu K H, Chen C. 2004. Significant crustal thinning beneath the Baikal rift zone: New constraints from receiver functions analysis. Geophys. Res. Lett., 31(20): L20610, doi:10.1029/2004GL020813.

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