Crustal Structure of the Rift‐Depression Basin and Yanshan Uplift in the Northeast Part of North China

Jia, Shanshan; Zhang, Cheng‐Ke; Zhao, Jun‐Hong; Fang, Sheng-Ming; Liu, Zhi; Zhao, Junmeng

doi:10.1002/cjg2.1326

Cited by 22 publications

(13 citation statements)

References 7 publications

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“…An S ‐RF study (Chen et al, ) suggested the presence of a shallower lithosphere‐asthenosphere boundary beneath the eastern Yanshan Uplift than the western Yanshan Uplift. The Moho depth also decreases from west to east (Jia et al, ; Li et al, ). Surface wave phase velocity tomography (Chen et al, , ) and ambient noise tomography investigations (Bao et al, ) revealed that relative to the western part, the eastern Yanshan Uplift has a lower velocity structure from the middle and lower crust to the upper mantle.…”

Section: Discussionmentioning

confidence: 99%

Crustal Azimuthal Anisotropy Beneath the Central North China Craton Revealed by Receiver Functions

Zheng

Ding

Ning

et al. 2019

Geochem Geophys Geosyst

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To characterize crustal anisotropy beneath the central North China Craton (CNCC), we apply a recently developed deconvolution approach to effectively remove near‐surface reverberations in the receiver functions recorded at 200 broadband seismic stations and subsequently determine the fast orientation and the magnitude of crustal azimuthal anisotropy by fitting the sinusoidal moveout of the P to S converted phases from the Moho and intracrustal discontinuities. The magnitude of crustal anisotropy is found to range from 0.06 s to 0.54 s, with an average of 0.25 ± 0.08 s. Fault‐parallel anisotropy in the seismically active Zhangjiakou‐Penglai Fault Zone is significant and could be related to fluid‐filled fractures. Historical strong earthquakes mainly occurred in the fault zone segments with significant crustal anisotropy, suggesting that the measured crustal anisotropy is closely related to the degree of crustal deformation. The observed spatial distribution of crustal anisotropy suggests that the northwestern terminus of the fault zone probably ends at about 114°E. Also observed is a sharp contrast in the fast orientations between the western and eastern Yanshan Uplifts separated by the North‐South Gravity Lineament. The NW‐SE trending anisotropy in the western Yanshan Uplift is attributable to “fossil” crustal anisotropy due to lithospheric extension of the CNCC, while extensional fluid‐saturated microcracks induced by regional compressive stress are responsible for the observed ENE‐WSW trending anisotropy in the eastern Yanshan Uplift. Comparison of crustal anisotropy measurements and previously determined upper mantle anisotropy implies that the degree of crust‐mantle coupling in the CNCC varies spatially.

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Section: Discussionmentioning

confidence: 99%

Crustal Azimuthal Anisotropy Beneath the Central North China Craton Revealed by Receiver Functions

Zheng

Ding

Ning

et al. 2019

Geochem Geophys Geosyst

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“…And the famous seismic belt, Tangshan-Hejian seismic belt, extends along western side of Cangxian uplift. The complex sub-tectonic units in the North China riftdepression basin are characterized by sinking and fragmentized basement, uplifted Moho, thinned crust and lateral tectonic differences (Jia and Zhang, 2005;Jia et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

Crustal structure beneath Beijing and its surrounding regions derived from gravity data

Jiang

Zhang

et al. 2011

Earthq Sci

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In this paper we use gravity data to study fine crustal structure and seismogenic environment beneath Beijing and its surrounding regions. Multi-scale wavelet analysis method is applied to separating gravity fields. Logarithmic power spectrum method is also used to calculate depth of gravity field source. The results show that the crustal structure is very complicated beneath Beijing and its surrounding areas. The crustal density exhibits laterally inhomogeneous. There are three large scale tectonic zones in North China, i.e., WNW-striking Zhangjiakou-Bohai tectonic zone (ZBTZ), NE-striking Taihang piedmont tectonic zone (TPTZ) and Cangxian tectonic zone (CTZ). ZBTZ and TPTZ intersect with each other beneath Beijing area and both of them cut through the lithosphere. The upper and middle crusts consist of many small-scale faults, uplifts and depressions. In the lower crust, these small-scale tectonic units disappear gradually, and they are replaced by large-scale tectonic units. In surrounding regions of Beijing, ZBTZ intersects with several other NE-striking tectonic units, such as Cangxian uplift, Jizhong depression and Shanxi Graben System (SGS). In west of Taihangshan uplift, gravity anomalies in upper and middle crusts are correlated with geological and topographic features on the surface. Compared with the crust, the structure is comparatively simple in uppermost mantle. Earthquakes mainly occurred in upper and middle crusts, especially in transitional regions between high gravity anomaly and low gravity anomaly. Occurrence of large earthquakes may be related to the upwelling of upper mantle and asthenosphere heat flow materials, such as Sanhe earthquake (MS8.0) and Tangshan earthquake (MS7.8).

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“…Previous survey results show that in the study area, the bottom of the crystalline basement is usually 3∼5 km deep with maximum 8∼10 km, and crust is 32∼38 km thick [13∼15, 19,20] . To image the fine structure from the near surface to the bottom of the crystalline basement, we have completed a mid-deep seismic profile with targeted depths 6∼8 km in the study area (MDSP in Fig.…”

Section: Seismic Profiles and Survey Methodsmentioning

confidence: 99%

Shallow Crustal Structures and Buried Active Faults Revealed by Seismic Reflection Profiles in the Northwest of Beijing Plain

Liu

Chen

et al. 2009

Chinese J of Geophysics

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Geological and geophysical studies suggest that there are many buried active faults and buried Quaternary basins below the Beijing plain. In order to investigate shallow crustal structures, geometry of buried faults, fault activity and the relationship between shallow and deep structures in this area, a mid‐deep seismic reflection profile with 60‐fold and several shallow seismic reflection profiles across buried faults were completed in the northwestern region of Beijing plain in 2006. The results show that the depth of crystalline basement is about 3~6 km along the profile. The seismic reflection section shows a set of strong reflected phases with good lateral continuity above the crystalline basement, which should be the sedimentary rock systems of Cenozoic, Mesozoic, and Paleozoic era. Beneath the crystalline basement, there is a series of weak reflected events with poor continuity possibly representing the crystallized rock system with comparatively strong metamorphism or other non‐layered rock systems. The faults revealed by mid‐deep and shallow seismic reflection profiles present consistent upper‐lower relationship and have been significantly active since Quaternary, which play an important role in controlling the rift valley‐horst like basin and range tectonics as well as the thicknesses of Cenozoic strata in this region. The study results can further improve the understanding of the neotectonic activity in the Beijing area, and the used exploration method and technology can serve as a reference for the survey of deep‐shallow structures in other areas.

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Crustal Structure of the Rift‐Depression Basin and Yanshan Uplift in the Northeast Part of North China

Cited by 22 publications

References 7 publications

Crustal Azimuthal Anisotropy Beneath the Central North China Craton Revealed by Receiver Functions

Crustal Azimuthal Anisotropy Beneath the Central North China Craton Revealed by Receiver Functions

Crustal structure beneath Beijing and its surrounding regions derived from gravity data

Shallow Crustal Structures and Buried Active Faults Revealed by Seismic Reflection Profiles in the Northwest of Beijing Plain

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