Structure of Lithospheric Mantle and Its Implications for the Evolution of Major Basins in China
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摘要: Pn波是通过莫霍面下方的上地幔顶部的地震波.由于Pn波的速度随温度和物质成分而变化, 以及Pn波各向异性可以反映地幔形变的历史.因此Pn波的速度以及各向异性成为探索岩石圈结构的重要工具.中国岩石圈地幔的Pn速度的特征是很高速的异常区和很低速的异常区呈镶嵌状出现, 反映了地质结构的不均匀性.西部大型盆地(塔里木、准噶尔、吐哈、柴达木和四川盆地) 具有较高的Pn速度和较弱的各向异性, 反映出这些盆地的岩石圈是冷的和坚硬的, 其变形较小.大面积的华北地区, 在太古代的基底下具有明显的Pn波低速度.研究结果表明与这些地区裂谷、岩石圈减薄和地幔上涌区相一致.Pn波各向异性与在最新(和目前正在进行) 的大规模变形期间, 岩石圈地幔沿NNE向右旋简单剪切相一致.华北的金矿藏以及华北和松辽盆地的石油储藏的位置明显地与该区的低Pn波速度区相吻合, 表明该区金属成矿和油储的形成与中、新生代以来在岩石圈地幔中的热活动, 以及壳幔之间的相互作用过程密切相关.Abstract: Seismic Pn waves sample the top of the upper mantle right beneath the Moho. Because Pn velocity varies with changes in temperature and material composition and Pn anisotropy may indicate the history of mantle deformation, Pn velocity and anisotropy have become an important tool to probe lithospheric structure. The lithosphere mantle Pn velocities of China are characterized by a mosaic of very fast and very slow anomalies, mirroring the heterogenity of geology at surface. The major basins in the west (Tarim, Junggar, Tuha, Qaidam, and Sichuan basins) have high Pn velocities and small Pn anisotropy, which suggests that the lithosphere of these basins is cold and strong with little deformation. A large area of North China shows prominent low Pn velocities beneath the Archean basement. Our observations are consistent with rifting, lithospheric thinning, and mantle upwelling in the region. The Pn anisotropy is consistent with a dextral simple shear in the NNE direction in the lithosphere mantle during the last (and ongoing) major deformation period. The locations of gold ore deposits in North China and oil deposits in North China and Songliao basins correlate remarkably well with low Pn velocities of the region, suggesting the metallogenesis and oil formation of the region may be closely related to magma and thermal activity in lithospheric mantle and crust-mantle interaction since Mesozoic and Cenozoic.
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Key words:
- structure of lithospheric mantle /
- major basins in China /
- Pn wave
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图 1 中国主要地壳单元划分[据Liang et al. (2003)修改]
背景上画上了地形的变化.主要盆地的轮廓用虚线表示, 由西向东分别为: 塔里木(TM), 准噶尔(JG), 吐哈(TUH), 柴达木(QDM), 四川(SC), 鄂尔多斯(OD), 江汉(JH), 南华北(SHB), 渤海湾(BHW)和松辽(SL).为了确定位置, 图中也标出了少量的城市: 北京(bj), 西安(xa), 成都(cd), 昆明(km), 拉萨(ls)
Fig. 1. Main crust units in China
图 2 Pn波的传播
Pn波在莫霍面临界折射.射线路径分为与震源、接受器和地幔相关联的3段.作者层析反演求解的是在地壳中与地震和台站相关联的静态延迟时间, 以及在射线经过的地幔顶部的横向速度变化和速度各向异性
Fig. 2. Sketch of Pn wave transmit
图 3 Pn波速度(用颜色表示)和各向异性(用短线表示) 的反演结果
红色和蓝色分别代表最低速7.7 km/s和最高速8.3 km/s.短线指出Pn波快波的方向, 短线的长度与各向异性的程度成正比, 短线最长代表 4%的各向异性.图中仅标出大于1%的各向异性.图中大型盆地轮廓用虚线表示, 华北大型金矿富集区用椭圆形表示.大型盆地轮廓引自Wang and Li (2004).大型金矿藏分布引自Zhai et al. (2002)和翟裕生等(2002)
Fig. 3. Inversion results of Pn velocity and anisotropy
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Backus, G.E., 1965. Possible forms of seismic anisotropy of the uppermost mantle under oceans. J. Geophys. Res. , 70: 3429-3439. doi: 10.1029/JZ070i014p03429 Bamford, D., 1977. Pnvelocity anisotropy in a continental uppermost mantle. Geophys. J. R. Astron. Soc. , 49: 29-48. doi: 10.1111/j.1365-246X.1977.tb03699.x Barry, T.L., Kent, R.W., 1998. Cenozoic magmatism in Mongolia and the origin of Central and East Asia basalts. In: Flower, M.F.J., Chung, S.L., Lo, C.H., et al., eds., Mantle dynamics and plate interactions in East Asia. Geodynamics, 27: 347-364. Beckers, J., Schwartz, S.Y., Lay, T., 1994. The velocity structure of the crust and upper mantle under China from broad-band P and PP waveform analysis. Geophys. J. Int. , 119: 574-594. doi: 10.1111/j.1365-246X.1994.tb00143.x Burchfiel, B.C., Wang, E.C., 2003. Northwest-trending, Middle Cenozoic, left-lateral faults in southern Yunnan, China, and their tectonic significance. J. Structural Geology, 25 (5): 781-792. doi: 10.1016/S0191-8141(02)00065-2 Chen, W.P., Nabelek, J., 1988. Seismogenic strike-slip faulting and the development of the North China basin tectonics. Tectonics, 7(5): 975-989. doi: 10.1029/TC007i005p00975 Chen, Z., Burchfiel, B.C., Liu, Y., et al., 2000. Global positioning system measurements from eastern Tibet and their implications for India/Eurasia intercontinental deformation. J. Geophys. Res. , 105(B7): 16215-16227. doi: 10.1029/2000JB900092 Curtis, A., Trampert, J., Snieder, R., et al., 1998. Eurasian fundamental mode surface wave phase velocities and their relationship with tectonic structures. J. Geophys. Res. , 103: 26919-26947. doi: 10.1029/98JB00903 Gao, S., Rudnick, R.L., Carlson, R.W., et al., 2002. Re-Os evidence for replacement of ancient mantle lithosphere beneath the North China craton. Earth Planet Sci. Lett. , 198: 307-322. doi: 10.1016/S0012-821X(02)00489-2 Gilder, A.A., Keller, G.R., Ming, L., et al., 1991. Timing and spatial-distribution of rifting in China. Tectonophysics, 197: 225-243. doi: 10.1016/0040-1951(91)90043-R Griffin, W.L., Zhang, A.D., O' Reilly, S.Y., et al., 1998. Phanerozoic evolution of the lithosphere beneath the Sino-Korean craton. In: Flower, M.F.J., Chung, S.L., Lo, C. H., et al., eds., Mantle dynamics and plate interactions in East Asia. Geodynamics, 27: 107-126. Griot, D.K., Montagner, J.P., Tapponnier, P., 1998. Phase velocity structure from Rayleigh and Love waves in Tibet and its neighboring regions. J. Geophys. Res. , 103: 21215-21232. doi: 10.1029/98JB00953 Hearn, T.M., 1996. Anisotropy Pntomography in the west United States. J. Geophys. Res. , 101: 8403-8414. doi: 10.1029/96JB00114 Huang, J.L., Zhao, D.P., Zheng, S.H., 2002. Lithospheric structure and its relationship to seismic and volcanic activity in southwest China. J. Geophys. Res. , 107(B10), 2255, doi: 10.1029/00JB00137. Huang, J.L., Song, X.D., Wang, S.Y., 2003b. Fine structure of Pnvelocity beneath Sichuan-Yunnan region. Science in China(Series D), 46(Suppl. ): 201-209. Huang, Z.X., Su, W., Peng, Y.J., et al., 2003a. Rayleigh wave tomography of China and adjacent regions. J. Geophys. Res. , 108(B2), 2073, doi: 10.1029/2001JB001696. Korsch, R.J., Mai, H.Z., Sun, Z.C., et al., 1997. Evolution and subsidence history of the Sichuan basin, Southwest China. In: Liu, B.J., Li, S.T., eds., Basin analysis, global sedimentary geology and sedimentology. Proc. 30th Int. Geol. Congress, 8: 208-221. Lebedev, S., Nolet, G., 2003. Upper mantle beneath southeast Asia from S velocity tomography. J. Geophys. Res. , 108 (B1), 2048, doi: 10.1029/2000JB000073. Lees, J.M., Crosson, R.S., 1989. Tomographic inversion for three-dimensional velocity structure at Mount St. Helens using earthquake data. J. Geophys. Res. , 94: 5716-5728. doi: 10.1029/JB094iB05p05716 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. , 45(6): 852-861. doi: 10.1002/cjg2.300 Li, S.T., Mo, X.X., Yang, S., 1995. Evolution of cirmcum-Pacific basins and volcanic belts in East China and their geodynamic background. J. China Univ. Geosci. , 6(1): 4-10. Li, Z.N., Wang, B.X., 1997. The map of gold mineral resources in lava areas of China. Geological Publishing House, Beijing(in Chinese). Liang, C.T., Song, X.D., Huang, J.L., 2003. Tomographic inversion of Pntravel-times in China, submitted to J. Geophys. Res. . Liu, F.T., Jin, A., 1993. Seismic tomography of China. In: Iyer, H.M., Hirahara, K., eds., Seismic tomography theory and practice. Chapman and Hall, New York, 299-318. Liu, F.T., Wu, H., Liu, J.H., et al., 1990.3-D velocity images beneath the Chinese continent and adjacent regions. Geophys. J. Int. , 101(2): 379-394. doi: 10.1111/j.1365-246X.1990.tb06576.x Liu, G., 1987. The Cenozoic rift system of the North China plain and the deep internal process. Tectonophysics, 133: 277-285. doi: 10.1016/0040-1951(87)90270-8 Ma, X., Liu, G., Su, J., 1984. The structure and dynamics of the continental lithosphere in north-northeast China. Ann. Geophys. , 2: 611-620. Ma, Z.J., Fu, Z.X., Zhang, Y.Z., et al., 1990. Earthquake prediction: Nine major earthquakes in China. Seismological Press, Beijing and Springer-Verlag, Berlin Heidelberg. Mahdi, H., Pavlis, G.L., 1998. Velocity variations in the crust and upper mantle beneath the Tien Shan inferred from Rayleigh wave dispersion: Implications for tectonic and dynamic processes. J. Geophys. Res. , 103: 2693-2703. doi: 10.1029/97JB03250 McNamara, D. E, Walter, W. R, Owens, T.J., et al., 1997. Upper mantle velocity structure beneath Tibet plateau from Pntravel time tomography. J. Geophys. Res. , 102: 493-505. doi: 10.1029/96JB02112 Menzies, M.A., Xu, Y.G., 1998. Geodynamics of the North China craton. In: Flower, M.F.J., Chung, S.L., Lo, C. H., et al., eds., Mantle dynamics and plate interactions in East Asia. Geodynamics, 27: 155-165. Molnar, P., Tapponnier, P., 1975. Cenozoic tectonics of Asia: Effects of a continental collision. Science, 189: 419-426. doi: 10.1126/science.189.4201.419 Nolet, G., 1987. Seismic tomography with application. In: Global seismology and exploration geophysics. D. Reidel Publishing Company, Dordrecht, Holland. Northrup, C.J., Royden, L.H., Burchfiel, B.C., 1995. Motion of the Pacific plate relative to Eurasia and its potential relation to Cenozoic extension along the eastern margin of Eurasia. Geology, 23: 719-722. Paige, C., Saunders, M.A., 1982a. LSQR: An algorithm for sparse linear equations and least squares problems. ACM Transactions on Mathematical Software, 8(1): 43-71. doi: 10.1145/355984.355989 Paige, C., Saunders, M. A., 1982b. LSQR: Sparse linear equations and least squares problems. ACM Transactions on Mathematical Software, 8(2): 195-209. doi: 10.1145/355993.356000 Pei, S.P., Xu, Z.H., Wang, S.Y., et al., 2002. Pnvelocity tomography of Xinjiang, China and adjacent region. Chinese J. Geophys. , 45(2): 217-224. doi: 10.1002/cjg2.234 Ren, J.Y., Tamaki, K., Li, S.T., et al., 2002. Late Mesozoic and Cenozoic rifting and its dynamic setting in eastern China and adjacent areas. Tectonophysics, 344(3-4): 175-205. doi: 10.1016/S0040-1951(01)00271-2 Ritzwoller, M.H., Levshin, A.L., 1998. Eurasian surface wave tomography: Group velocities. J. Geophys. Res. , 103: 4839-4878. doi: 10.1029/97JB02622 Royden, L.H., Burchfiel, B.C., King, R.W., et al., 1997. Surface deformation and lower crustal flow in eastern Tibet. Science, 276: 788-790. doi: 10.1126/science.276.5313.788 Sha, J.A., Liu, F.T., Chen, H., 2001. Seismic tomography of the northwest Pacific and its geodynamic implications. Prog. Nat. Sci. , 11(1): 46-+ JAN. Silver, P.G., 1996. Seismic anisotropy beneath the continents: Probing the depths of geology. Ann. Rev. Earth Planet. Sci. , 24: 385-432. doi: 10.1146/annurev.earth.24.1.385 Sun, Y.S., Li, X., Kuleli, S., et al., 2004. Adaptive moving window method for 3-D P-velocity tomography and its application in China. Bull. Seism. Soc. Am. (in press). Tapponnier, P., Peltzer, G., Ledain, A.Y., et al., 1982. Propagating extrusion tectonics in Asia: New insights from simple experiments with plasticine. Geology, 10: 611-616. Teng, J.W., Wang, Q.S., Liu, Y.L., et al., 1983. Geophysical field characteristics, distribution and formation of hydrocarbon-bearing basins of East China. Chinese J. Geophys. , 26(4): 319-330. Wang, H., Li, S.T., 2004. Tectonic evolution of China and its control over oil basins. Journal of China University of Geosciences, 15(1): 1-8. Wang, H., Mo, X., 1995. An outline of the tectonic evolution of China. Episodes, 18: 6-16. doi: 10.18814/epiiugs/1995/v18i1.2/003 Wang, S.Y., Hearn, T., Xu, Z.H., et al., 2002. Velocity structure of uppermost mantle beneath China continent from Pntomography. Science in China(Series D), 45(2): 143-150. doi: 10.1007/BF02879791 Wang, S.Y., Xu, Z.H., Pei, S.P., 2003. Velocity structure of uppermost mantle beneath North China from Pntomography and its implications. Science in China(Series D), 46 (Suppl. ): 130-140. Watson, M., Hayward, A.B., Parkinson, D.N., et al., 1987. Plate tectonic history, basin development and petroleum source rock deposition onshore China. Marine and Petroleum Geol. , 4: 205-225. doi: 10.1016/0264-8172(87)90045-6 Wu, F. T., Levshin, A. L., Kozhevnikov, V. M., 1997. Rayleigh wave group velocity tomography of Siberia, China and the vicinity. Pure Appl. Geophys. , 149: 447-473. doi: 10.1007/s000240050035 Xu, G.M., Li, G.P., Wang, S.E., et al., 2000. The 3-D structure of shear waves in the crust and mantle of east continental China inverted by Rayleigh wave data. Chinese J. Geophys, 43(3): 395-406, doi: 10.1002/cjg2.49 Xu, P.F., Liu, F.T., Wang, Q.C., et al., 2001. Slab-like high velocity anomaly in the uppermost mantle beneath the Dabie-Sulu orogen. Geophys. Res. Lett. , 28(9): 1847-1850. doi: 10.1029/2000GL012187 Xu, Y., Liu, F.T., Liu, J.H., et al., 2002. Crust and upper mantle structure beneath western China from P wave travel time tomography. J. Geophys. Res. , 107(B10): 2220, doi: 10.1029/2001JB000402. Xu, Z.H., Wang, S.Y., Pei, S.P., et al., 2003. Lateral variation of Pnvelocity beneath northeastern marginal region of Qinghai-Xizang plateau. Acta Seismologica Sinica, 16 (1): 26-33. doi: 10.1007/s11589-003-0003-z Yin, A., Harrison, T.M., 2000. Geological evolution of the Himalayan-Tibetan orogen. Annu. Rev. Earth Planet. Sci. , 28: 211-280. doi: 10.1146/annurev.earth.28.1.211 Zeng, R.S., Wang, C.Y., Zhang, D.N., 1995. On the dynamics of extensional basin. Pure Appl. Geophys. , 145(3-4): 579-603. doi: 10.1007/BF00879590 Zhai, M.G., Yang, J.H., Fan, H.R., et al., 2002. A large-scale cluster of gold deposits and metallogenesisin the eastern North China craton. Inter. Geol. Rev. , 44: 458-476. doi: 10.2747/0020-6814.44.5.458 Zhai, Y.S., 2002. Metallogenic system in the margin of paleocontinent. Geological Publishing House, Beijing(in Chinese). Zhang, C.K., Zhang, X.K., Zhao, J.R., et al., 2002. Study and review on crust-mantle velocity structure in Bohai Bay and its vicinity. Acta Seismologica Sinica, 15(4): 447-455. doi: 10.1007/s11589-002-0038-6 Zhang, Y.S., Lay, T., 1996. Global surface wave phase velocity variations. J. Geophys. Res. , 101: 8415-8436. doi: 10.1029/96JB00167 Zhang, Z.M., Liu, J.G., Coleman, R.G., 1984. An outline of the plate tectonics of China. Geol. Soc. Am. Bull. , 95: 295-312. doi: 10.1130/0016-7606(1984)95<295:AOOTPT>2.0.CO;2 Zhao, L.S., Xie, J.K., 1993. Later variation in compressional velocities beneath the Tibetan plateau from Pntraveltime tomography. Geophys. J. Int, 115: 1070-1084. doi: 10.1111/j.1365-246X.1993.tb01510.x Zhou, X.H., Yang, J.H., Zhang, L.C., 2003. Metallogenesis of superlarge gold deposits in Jiaodong region and deep processes of subcontinental lithosphere beneath North China craton in Mesozoic. Science in China(Series D), 46(Suppl. ): 14-25. Zhu, J.S., Cao, J.M., Cai, X.L., et al., 2002. High resolution surface wave tomography in East Asia and West Pacific marginal seas. Chinese J. Geophys. , 45(5): 679-698. doi: 10.1002/cjg2.282 翟裕生, 2002. 古陆边缘成矿系统. 北京: 地质出版社. 李兆鼐, 王碧香, 1997. 中国火山岩地区金矿资源图. 北京: 地质出版社. -
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