The P-wave velocity structure of the lithosphere of the North China Craton—Results from the Wendeng-Alxa Left Banner deep seismic sounding profile

Wang, Shuaijun; Wang, Fuyun; Zhang, Jian-shi; Jia, Shanshan; Zhang, Chengke; Zhao, Jun‐Hong; Liu, Baofeng

doi:10.1007/s11430-014-4903-7

Cited by 47 publications

(24 citation statements)

References 27 publications

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“…Our thermal model predicts that the lithosphere is 110-130 km thick only in the southern part of the WB and is on average 100-110 km thick in most of the WB (Figure 4a). In support of our results, regional surface wave tomography (Guo & Chen, 2017;Huang et al, 2009;Y.-C. Tang et al, 2013;X.-C. Wang et al, 2017) and a long-range refraction seismic profile which reach the LAB suggest that most of the WB has a relatively shallow LAB (S.-L. Li, Lai, et al, 2011;S.-J. Wang et al, 2014).…”

Section: Journal Of Geophysical Research: Solid Earthsupporting

confidence: 88%

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Lithosphere Mantle Density of the North China Craton

2020

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We constrain the lithospheric mantle density of the North China Craton (NCC) at both in situ and standard temperature-pressure (STP) conditions from gravity data. The lithosphere-asthenosphere boundary (LAB) depth is constrained by our new thermal model, which is based on a new regional heat flow data set and a recent regional crustal model NCcrust. The new thermal model shows that the thermal lithosphere thickness is <120 km in most of the NCC, except for the northern and southern parts with the maximum depth of 170 km. The gravity calculations reveal a highly heterogeneous density structure of the lithospheric mantle with in situ and STP values of 3.22-3.29 and 3.32-3.40 g/cm 3 , respectively. Thick and reduced-density cratonic-type lithosphere is preserved mostly in the southern NCC. Most of the Eastern Block has a thin (90-140 km) and high-density lithospheric mantle. Most of the Western Block has a high-density lithospheric mantle and a thin (80-110 km) lithosphere typical of Phanerozoic regions, which suggests that the Archean lithosphere is no longer present there. We conclude that in almost the entire NCC the lithosphere has lost its cratonic characteristics by geodynamic processes that include, but are not limited to, the Paleozoic closure of the Paleo-Asian Ocean in the north, the Mesozoic Yangtze Craton flat subduction in the south, the Mesozoic Pacific subduction in the east, the Cenozoic remote response to the Indian-Eurasian collision in the west, and the Cenozoic extensional tectonics (possibly associated with the slab roll-back) in the center.

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Section: Journal Of Geophysical Research: Solid Earthsupporting

confidence: 88%

“…While the presence of thin lithosphere in the EB is supported by various seismic studies, detailed information on the LAB (lithosphere‐asthenosphere boundary) depth beneath the NCC is still controversial (Chen et al, 2006; Huang et al, 2009; S.‐J. Wang et al, 2014; Y.‐Y. Zhang et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Lithosphere Mantle Density of the North China Craton

2020

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“…The estimated crustal thicknesses were further interpolated into meshed 0.2° × 0.2° grids of the study area (Figure a). The crustal thickness varies from ∼65 km in the NETP to ∼40 km in the western NCC (Figure ), which is consistent with previous estimates from the H ‐ κ stacking method [e.g., Li et al ., , , ; Pan and Niu , ; Tian and Zhang , ; H. Wang et al ., ; Wang et al ., ; X. Wang et al ., ; W. Wang et al ., ; Xu et al ., ; Zheng et al ., ] and active‐source seismic profiles [e.g., Jia et al ., ; Liu et al ., ; Teng et al ., ; C. Y. Wang et al ., ; S. J. Wang et al ., ]. A difference in the Moho depth is observed from the QLT to Alxa block by as much as 10 km across the HF and NQF (Figure ).…”

Section: Resultsmentioning

confidence: 99%

Three‐dimensional lithospheric S wave velocity model of the NE Tibetan Plateau and western North China Craton

Xingchen

Ding

et al. 2017

JGR Solid Earth

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We present a new 3‐D lithospheric Vs model for the NE Tibetan Plateau (NETP) and the western North China Craton (NCC). First, high‐frequency receiver functions (RFs) were inverted using the neighborhood algorithm to estimate the sedimentary structure beneath each station. Then a 3D Vs model with unprecedented resolution was constructed by jointly inverting RFs and Rayleigh wave dispersions. A low‐velocity sedimentary layer with thicknesses varying from 2 to 10 km is present in the Yinchuan‐Hetao graben, Ordos block, and western Alxa block. Velocities from the middle‐lower crust to the uppermost mantle are generally high in the Ordos block and low in the Alxa block, indicating that the Alxa block is not part of the NCC. The thickened crust in southwestern Ordos block and western Alxa block suggests that they have been modified. Two crustal low‐velocity zones (LVZs) were detected beneath the Kunlun Fault (KF) zone and western Qilian Terrane (QLT). The origin of the LVZ beneath the KF zone may be the combined effect of shear heating, localized asthenosphere upwelling, and crustal radioactivity. The LVZ in the western QLT, representing an early stage of the LVZ that has developed in the KF zone, acts as a decollement to decouple the deformation between the upper and lower crust and plays a key role in seismogenesis. We propose that the crustal deformation beneath the NETP is accommodated by a combination of shear motion, thickening of the upper‐middle crust, and removal of lower crust.

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“…The profile can be divided into three segments in the landscape, the Alxa block, Jilantai transitional zone, and Lei et al (2015) and Wang et al (2014) and crust1.0, the initial model is established (Table 1). In terms of the above, applying a human-computer interaction method inverts the profile gravity anomaly, and gives the layered structure of the profile density model, which is shown in Fig.…”

Section: Crustal Density Structurementioning

confidence: 99%

Gravity anomaly and crustal density structure in Jilantai rift zone and its adjacent region

Shen

Tan

et al. 2016

Earthq Sci

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This paper deals with the interpretation of Bouguer gravity anomalies measured along a 250 km long Suhaitu-Etuokeqi gravity profile located at the transitional zone of the Alxa and Ordos blocks where geophysical characteristics are very complex. The analysis is carried out in terms of the ratio of elevation and Bouguer gravity anomaly, the normalized full gradient of a section of the Bouguer gravity anomaly (G h ) and the crustal density structure reveal that (1) the ratio of highs and lows of elevation and Bouguer gravity anomaly is large between Zhengyiguan fault (F4) and Helandonglu fault (F6), which can be explained due to crustal inhomogeneities related to the uplift of the Qinghai-Tibet block in the northeast; (2) the main active faults correspond to the G h contour strip or cut the local region, and generally show strong deformation characteristics, for example the Bayanwulashan mountain front fault (F1) or the southeast boundary of Alxa block is in accord with the western change belt of G h , a belt about 10 km wide that extends to about 30 km; (3) YinchuanPingluo fault (F8) is the seismogenic structure of the Pingluo M earthquake, and its focal depth is about 15 km; (4) the Moho depth trend and Bouguer gravity anomaly variation indicates that the regional gravity field is strongly correlated with the Moho discontinuity.

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The P-wave velocity structure of the lithosphere of the North China Craton—Results from the Wendeng-Alxa Left Banner deep seismic sounding profile

Cited by 47 publications

References 27 publications

Lithosphere Mantle Density of the North China Craton

Lithosphere Mantle Density of the North China Craton

Three‐dimensional lithospheric S wave velocity model of the NE Tibetan Plateau and western North China Craton

Gravity anomaly and crustal density structure in Jilantai rift zone and its adjacent region

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