Abstract
This study deals with complexity, frequency spectrum and velocity model of the crust-mantle transitional zone in different tectonic units along the northeast margin of Qinghai-Xizang plateau, based on PmP waveform data from two deep seismic sounding profiles passing through the area. It reveals that Moho has stable tectonic features in Ordos and Lingzhong basins, where crust and mantle are coupled as first-order discontinuity. Moho shows obvious signs of activity in Haiyuan seismic region and in the contact zone between Bayanhar block and Qaidam block. Crust and mantle in these two areas are coupled as complicated crust-mantle transitional zone consisting of multiple laminae with alternate high and low velocities, totaling 20 km in thickness. The difference between Moho of different tectonic units reflects heterogeneity of the coupled crust-mantle zone; the difference between fine structures of Haiyuan seismic region and Maqin fault zone reflects different deep material composition of the two continent-continent collision zones and the interaction between blocks.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Cheng Qian-sheng. 1979. Hilbert transform and signal envelop, transient phase, transient frequency [J].Oil Geophysical Prospecting,14(3): 1–14 (in Chinese).
Ding Guo-Yu, Cai Wen-bo, Yu Pin-qing,et al eds. 1991.Lithospheric Dynamics of China [M]. Beijing: Seismological Press, 29–34 (in Chinese).
Gao Rui, Li Peng-wu, Li Qiu-sheng,et al. 2001. Deep procedure of collision deformation on north margin in Qinghai-Xizang plateau — The results from deep seismic sounding [J].Science in China (Series D),31(Suppl): 66–71 (in Chinese).
Huang Li-ren, Wang Min. 2003. Present-day activity and deformation of tectonic blocks in China’s continent [J].Seismology and Geology,25(1): 23–32 (in Chinese).
Lai Xiao-ling, Li Song-lin, Zhang Xian-kang,et al. 2001. A study on the complexity at the crust-upper mantle transition zone along Maqin-Lanzhou-Jingbian deep seismic sounding (DSS) profile [J].Progress in Geophysics,16(2): 65–72 (in Chinese).
Lai Xiao-ling, Zhang Xian-kang, Li Song-lin,et al. 2003. The application of wavelet multi-resolution in the study of crust-mantle heterogeneous scale [J].Chinese J Geophys,46(1):47–53 (in Chinese).
Li Qing-he, Guo Shou-nian, LÜ De-wei eds. 1999.The Deep Structure and Tectonics in West Margin and Southwest Margin ofOrdos [M]. Beijing: Seismological Press, 1–256 (in Chinese).
Li Shi-xiong, Wang Ji-wen. 2000. Instantaneous parameters of signals and orthogonal bases of wavelets [J].Chinese J Geophys,43(1) 97–104 (in Chinese).
Li Song-lin, Zhang Xian-kang, Zhang Cheng-ke,et al. 2002. A preliminary study on the crustal velocity structure of Maqin-Lanzhou-Jingbian by means of deep seismic sounding profile [J].Chinese J Geophys,45(2): 210–217 (in Chinese).
Liu Bao-feng, Li Song-lin, Zhang Xian-kang,et al. 2003. Study of crustal structure with S-wave data from Maqin-Jingbian profile [J].Acta Seismologica Sinica,16(1): 92–98.
Mereu RF. 1990. The complexity of the crust from refraction/wide-angle reflection data [J].Pure Apply Geophys,132(1/2): 269–288.
Pan Yu-sheng, Kong Xiang-ru eds-in-chief. 1998.Lithosphere Structure, Evolution and Dynamics of Tibetan [M]. Guangzhou: Guangdong Science & Technology Press, 1–426 (in Chinese).
Sun Hong-lie, Zheng Du eds-in-chief. 1998.Formation, Evolution and Development of Qinghai-Xizang Plateau [M]. Guangzhou: Guangdong Science &Technology Press, 1–348 (in Chinese).
Wang Min, Shen Zheng-kang, Niu Zhi-jun,et al. 2003. Present-day crustal movement and active blocks model [J].Science in China (Series D),33(Suppl): 21–32 (in Chinese).
Xu Zhi-qin, Yang Jing-sui, Jiang Mei,et al. 2001. Lithosphere structure and shear fault of Qinghai-Xizang plateau and East Kunlun Qiangtang region [J].Science in China (Series D),31(Suppl):1–7 (in Chinese).
Zeng Rong-sheng, Ding Zhi-feng, Wu Qing-ju. 1998. The crustal structures from Himalaya to Qilian and its implications for continent-continent collision process [J].Chinese J Geophys,41(1): 49–60 (in Chinese).
Zeng Rong-sheng, Ding Zhi-feng, Wu Qing-ju,et al. 2000. Seismological evidences for the multiple incomplete crustal subductions in Himalaya and southern Tibet [J].Chinese J Geophys,43(6): 780–797 (in Chinese).
Zheng Jian-dong, Yang Wei-ran, Guo Tie-ying. 1989. Geotectonics [A]. In: MA Xing-yuan ed-in-chief.Lithospheric Dynamics Atlas of China [C]. Beijing: China Cartographic Publishing House, 30 (in Chinese).
Zhang Pei-zhen, Deng Qi-dong, Zhang Guo-min,et al. 2003. Active blocks and strong earthquakes in mainland China [J].Science in China (Series D),33(Suppl):12–20 (in Chinese).
Author information
Authors and Affiliations
Additional information
Foundation item: Chinese Joint Seismological Science Foundation (102025, 104027).
About this article
Cite this article
Xiao-Ling, L., Xian-Kang, Z. & Sheng-Ming, F. Study of crust-mantle transitional zone along the northeast margin of Qinghai-Xizang plateau. Acta Seismol. Sin. 17, 144–151 (2004). https://doi.org/10.1007/BF02896929
Received:
Revised:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF02896929