Crustal structure across the Three Gorges area of the Yangtze platform, central China, from seismic refraction/wide-angle reflection data

Zhang, Zhongjie; Bai, Zhiming; Mooney, Walter D.; Wang, Chunyong; Chen, Xuebo; Wang, Erchie; Teng, Jun; Okaya, N.

doi:10.1016/j.tecto.2009.05.022

Cited by 38 publications

(19 citation statements)

References 45 publications

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“…Wang et al, 2003). It contains three TriassicJurassic orogens: the Qinling-Dabie orogenic belt along its northern margin, which records the collision with the North China block; the Longmenshan belt along its northwestern margin, likely related to the lower crust flow in the Tibetan Plateau; and the South China fold belt, which has a broad northeastward tread Li, 1994;Li and Li, 2007;Wang, 2009;Wang and Shu, 2012;Zhang et al, 2009c, Z.J. Zhang et al, 2011.…”

Section: Introductionmentioning

confidence: 99%

3-D density structure under South China constrained by seismic velocity and gravity data

et al. 2014

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Section: Introductionmentioning

confidence: 99%

3-D density structure under South China constrained by seismic velocity and gravity data

et al. 2014

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“…The location of the TGR region makes it an interesting area to study the long-term interaction between tectonic blocks. The TGR region is situated near the northern margin of the Yangtze platform, and it is bounded at north by the Qinling-Dabie orogenic belt (Zhang et al, 2009). As one of the oldest blocks in Central China, the collision between the Yangtze platform and the Qinling-Dabie orogenic belt has resulted in a complex geological history and a highly heterogeneous distribution of lithological units, with a combination of igneous and sedimentary rocks in the TGR region.…”

Section: Introductionmentioning

confidence: 99%

“…The age of the oldest rocks can be traced back to 3 290 Ma (Xiong et al, 2004). According to the distributions of seismic velocity variations and gravity anomalies, Central China can be divided into a western region and an eastern region (Zhang et al, 2009;Sun and Toksöz, 2006), and the crust and lithosphere are thinning from west to east (Zhang et al, 2009;An and Shi, 2006;Li S L et al, 2006;Sun and Toksöz, 2006;Teng et al, 2003). The TGR region is in the boundary zone be- Zou Zhihui,Zhou Huawei and Liao Wulin 206 tween those two regions.…”

Section: Introductionmentioning

confidence: 99%

“…Several models of the crust and upper mantle beneath the TGR can be inferred from publications on the crust and lithosphere structure of China (Zhang et al, 2009;Li Q et al, 2009;An and Shi, 2006;Li S L et al, 2006;Sun and Toksöz, 2006;Teng et al, 2003). All of the published models indicate that the Moho and the base of lithosphere under the TGR are dipping towards west in general, though the crustal thickness and the dipping angle of the Moho vary amongst different models.…”

Section: Introductionmentioning

confidence: 99%

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Crustal and upper-mantle seismic reflectors beneath the Three Gorges Reservoir region

Zou

Zhou

Liao³

2011

J. Earth Sci.

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Seismic studies of the crustal structure beneath the Three Gorges Reservoir (TGR) region in Central China have been limited by the sparse and uneven distribution of seismic stations. To increase the station coverage, we made three deployments of a mobile seismologic array in the TGR region during the three summers from 2008 to 2010. Here we present interpretations along a west-east profile through the central TGR region based on new seismic waveform data and a velocity model constrained by regional earthquake data. Two strong mid-crustal reflection interfaces at depths around 10 and 20 km are seen under the TGR. The shallow reflector defines the bottom of the Zigui (秭归) basin. The new waveform data show that the amplitude of the Moho reflection is quite weak, and beneath theMoho, there is a strong reflector around 54-km depth. It is likely that in the TGR region, the Moho is a gradient rather than a sharp boundary. We speculate that the gradient Moho and the 54-km-deep reflector in the upper mantle in the TGR region may be by-products of the Qinling (秦岭)-Dabie (大别) orogen.

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“…Numerous schemes have been developed either for identifying different types of rocks and fluid distribution in the crust (Christensen and Mooney, 1995;Christensen, 1996;Zandt and Ammon, 1995;Egorkin, 1998;Chevrot and van der Hilst, 2000;Zhang et al, 2009) or modelling its composition (Brown et al, 2003). However, an essential problem in the construction of a petrologic composition model is how to reduce the non-uniqueness in rock distribution mapping for geophysical interpretation.…”

Section: Introductionmentioning

confidence: 99%

Petrologic composition model of the upper crust in Bohai Bay basin, China, based on Lamé impedances

Zhang¹,

Tsang

Wang

et al. 2009

Appl. Geophys.

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Seismic attributes, such as P-and S-wave velocity, Poisson's ratio, and acoustic impedances, all generally can be used for distinguishing different rock types. The nonuniqueness can be largely reduced using Lamé impedances instead of acoustic impedances as additional constraints. We have followed this method to constitute a petrologic composition model of the upper crust in the Bohai Bay basin, China. We briefly review the seismic parameters used for discrimination of rock types and focus our attention on the sensitivity of different combinations of parameters to determine the composition of materials. Corrections for pressure and temperature are performed in order to compare elastic wave velocities and densities measured at room temperature and surface pressure in laboratory with those for representative rock parameters. In a second step, we find the rock classes in the tested area by contrasting known data to laboratory measurements on a variety of rock samples extracted in the area. The basic field data are P-wave velocity values collected along a seismic profile conducted in the Bozhong Depression. The different rock types belonging to a particular rock class are finally constrained by the seismic velocities, Poisson's ratio, density, acoustic impedance, and Lamé impedance related to the topmost 10 km of the Bohai Bay crust.

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Crustal structure across the Three Gorges area of the Yangtze platform, central China, from seismic refraction/wide-angle reflection data

Cited by 38 publications

References 45 publications

3-D density structure under South China constrained by seismic velocity and gravity data

3-D density structure under South China constrained by seismic velocity and gravity data

Crustal and upper-mantle seismic reflectors beneath the Three Gorges Reservoir region

Petrologic composition model of the upper crust in Bohai Bay basin, China, based on Lamé impedances

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