Crustal structure and tectonic study of North China Craton from a long deep seismic sounding profile

Jia, Shanshan; Wang, Fuyun; Tian, Xiaofeng; Duan, Yonghong; Zhang, Jian-shi; Liu, Baofeng; Lin, Jian

doi:10.1016/j.tecto.2014.04.013

Cited by 56 publications

(47 citation statements)

References 18 publications

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“…In the interior of the Ordos, Moho depth varies from 40 to 45 km, Poisson's ratio fluctuates slightly around the continental average of 0.27 (Figure 4, Zandt et al, 1995), and receiver function amplitude shows moderate small-scale variation ( Figure 6). These features are consistent with a stable tectonic setting (Zhai et al, 2003) and a homogeneous and parallel-layer crustal structure Jia et al, 2014), suggesting the long-term preservation of crustal fabrics since the Phanerozoic.…”

Section: Mineral Experiments Show That Poisson's Ratio In the Uppersupporting

confidence: 70%

Regional differences in crustal structure of the North China Craton from receiver functions

Wei

Chu

Chen

2015

Sci. China Earth Sci.

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Moho depth and crustal average Poisson's ratio for 823 stations are obtained by H- stacking of receiver functions. These, together with topography and receiver function amplitude information, were used to study the crustal structure beneath the North China Craton (NCC). The results suggest that modified and preserved crust coexist beneath the craton with generally Airy-type isostatic equilibrium. The equilibrium is relatively low in the eastern NCC and some local areas in the central and western NCC, which correlates well with regional geology and tectonic features. Major differences in the crust were observed beneath the eastern, central, and western NCC, with average Moho depths of 33, 37, and 42 km and average Poisson's ratios of 0.268, 0.267 and 0.264, respectively. Abnormal Moho depths and Poisson's ratios are mainly present in the rift zones, the northern and southern edges of the central NCC, and tectonic boundaries. The crust beneath Ordos retains the characteristics of typical craton. Poisson's ratio increases roughly linearly as Moho depth decreases in all three parts of the NCC with different slopes. Receiver function amplitudes are relatively large in the northern edge of the eastern and central NCC, and small in and near the rifts. The Yanshan Mountains and southern part of the Shanxi rift show small-scale variations in the receiver-function amplitudes. These observations suggest that overall modification and thinning in the crust occurred in the eastern NCC, and local crustal modification occurred in the central and western NCC. Different crustal structures in the eastern, central, and western NCC suggest different modification processes and mechanisms. The overall destruction of the crustal structure in the eastern NCC is probably due to the westward subduction of the Pacific Plate during the Meso-Cenozoic time; the local modifications of the crust in the central and western NCC may be due to repeated reactivations at zones with a heterogeneous structure by successive thermal-tectonic events during the long-term evolution of the NCC.North China Craton, Moho depth, Poisson's ratio, gravitational equilibrium, receiver function amplitude, regional difference in crust Citation:

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Section: Mineral Experiments Show That Poisson's Ratio In the Uppersupporting

confidence: 70%

Regional differences in crustal structure of the North China Craton from receiver functions

Wei

Chu

Chen

2015

Sci. China Earth Sci.

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“…The deep substances migrated eastward owing to the control of the long-range effect of the Indian Plate, while the upper-mantle substances upwelled owing to the blocking effect (subduction) of the Pacific-Philippine Plate (Xu et al 2011). The North China basin depression as well as the normal fractures of its major faults was formed under this background (Jia et al 2014). The shallow stretching environment provided a favorable release channel for the upward arching of the deep substances.…”

Section: Theoretical Analysismentioning

confidence: 93%

The bending mechanism of Anping ground fissure in the Hebei Plain, North China

Meng

et al. 2015

Environ Earth Sci

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The Anping fissure is one typical and particular ground fissure in the North China Plain. This study was carried out in Anping area with geological means, such as surveying, mapping, trenching and drilling. The geological structure and disasters were analyzed by both qualitative and quantitative methods. The main conclusions are as follows: (1) Anping ground fissure is the local manifestation of regional tectonic stress field and is basically folding directional, hidden and intermittent. (2) Under the control of Shen-rao fault, Anping ground fissure was exposed and expanded by water-related human activities, and then was cracked by small-and medium-sized earthquakes. (3) The forming process followed the bending-cracking rules. The uplifting force from deep in the earth bent the entire overlying strata. The tangential stress below the ground surface counterbalanced the horizontal stress of soils, even breaking through their tensile strength and inducing cracks. The fissure was periodic and wavery, because the cracking force was proportional to the uplifting force but inversely proportional to the stratigraphic depth.

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“…In case of multiple interpretations for the same seismic profile (e.g., Profile 10, the Shijiazhuang‐Kalaqin, interpreted by Sun et al [] and by S. J. Wang et al []) we preferred the latest one, since recent interpretations are usually of a higher quality. For the Wendeng‐Alashan profile (Profile 11 in Figure a) [ Jia et al , ; Tian et al , ], we use the interpretation by the data acquisition group. If two or more profiles cross the same area (e.g., the Capital area), we use the most recent (after 2000) data acquisition and interpretation.…”

Section: Seismic Data On the Crustal Structurementioning

confidence: 99%

“…At the same location, double interfaces were observed in receiver functions from teleseismic events at different azimuths, and the shallower interface at 40 km depth was interpreted as the Moho [ He et al , ], in agreement with our interpretation. Further, the most recent seismic reflection profile (Profile 11 in Figure a) [ Jia et al , ; Tian et al , ] and the crustal shear wave velocity structure from ambient noise tomography [ Cheng et al , ] also suggest that the Moho depth is ∼40 km. Seismic refraction study of the upper mantle beneath the Ordos Basin shows a relatively weak reflectivity in the P wave section at 60 km depth, and the most recent interpretation of this profile (Profile 38 in Figure a) does not include any reflector at ∼60 km depth [ Zhang et al , ].…”

Section: Analysis Of the Nccrust: General Patterns And Regional Variamentioning

confidence: 99%

Seismic crustal structure of the North China Craton and surrounding area: Synthesis and analysis

2017

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We present a new digital model (NCcrust) of the seismic crustal structure of the Neoarchean North China Craton (NCC) and its surrounding Paleozoic‐Mesozoic orogenic belts (30°–45°N, 100°–130°E). All available seismic profiles, complemented by receiver function interpretations of crustal thickness, are used to constrain a new comprehensive crustal model NCcrust. The model, presented on a 0.25° × 0.25°grid, includes the Moho depth and the internal structure (thickness and velocity) of the crust specified for four layers (the sedimentary cover, upper, middle, and lower crust) and the Pn velocity in the uppermost mantle. The crust is thin (30–32 km) in the east, while the Moho depth in the western part of the NCC is 38–44 km. The Moho depth of the Sulu‐Dabie‐Qinling‐Qilian orogenic belt ranges from 31 km to 51 km, with a general westward increase in crustal thickness. The sedimentary cover is 2–5 km thick in most of the region, and typical thicknesses of the upper crust, middle crust, and lower crust are 16–24 km, 6–24 km, and 0–6 km, respectively. We document a general trend of westward increase in the thickness of all crustal layers of the crystalline basement and as a consequence, the depth of the Moho. There is no systematic regional pattern in the average crustal Vp velocity and the Pn velocity. We examine correlation between the Moho depth and topography for seven tectonic provinces in the North China Craton and speculate on mechanisms of isostatic compensation.

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Crustal structure and tectonic study of North China Craton from a long deep seismic sounding profile

Cited by 56 publications

References 18 publications

Regional differences in crustal structure of the North China Craton from receiver functions

Regional differences in crustal structure of the North China Craton from receiver functions

The bending mechanism of Anping ground fissure in the Hebei Plain, North China

Seismic crustal structure of the North China Craton and surrounding area: Synthesis and analysis

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