Joint land-sea seismic survey and research on the deep structures of the Bohai Sea areas

Hao, Tianyao; You, Qinglong; Liu, Lihua; Lv, Chuanchuan; Xu, Ya; Li, Zhiwei; Zhao, Chunlei; Zheng, Yong; Liu, Chenguang; Han, Guoyong

doi:10.1007/s13131-013-0383-4

Cited by 16 publications

(17 citation statements)

References 13 publications

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“…Compared with intermediate‐felsic rocks, underplating mafic melts have a higher P wave velocity (Christensen & Mooney, ; Gao et al, ). This appears to be consistent with seismic studies (Hao et al, ; Xu et al, ), as the mushroom anomalies are typically underlain by high‐velocity anomalies within the overlying crust (Figures b and c). The results are also consistent with the observations that the lower crustal thickness in extensional regions appears to be noticeably thicker (~10 km) than the thicknesses beneath extension‐free inner cratonic areas (<5 km; Deng et al, ; Gao et al, ; Xia et al, ).…”

Section: Discussionsupporting

confidence: 90%

“…components do also locally exist (Zhang et al, 2008;Zheng et al, 2001). Seismic tomography reveals a 50-150-km-wide mushroom-like low-velocity anomalies within the lithospheric mantle, especially close to the Tan-Lu fault zone, and these "mushrooms" are underlain by high-velocity anomalies within the crust (Hao et al, 2013;Xu et al, 2002;Yuan, 1996).…”

Section: Tectonic and Magmatic Evolution During Encc Destructionmentioning

confidence: 99%

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Craton Destruction 2: Evolution of Cratonic Lithosphere After a Rapid Keel Delamination Event

Liu

Morgan

et al. 2018

JGR Solid Earth

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Cratonic lithosphere beneath the eastern North China Craton has undergone extensive destruction since early Jurassic times (approximately 190 Ma). This is recorded in its episodic tectonic and magmatic history. In this time, its lithosphere changed thickness from approximately 200 km to <60 km. This change was associated with a peak time (approximately 120 Ma) of lithospheric thinning and magmatism that was linked with high surface heat flow recorded in rift basins. We believe that these records are best explained by a two‐stage evolutionary process. First, approximately 100 km of cratonic “keel” underlying a weak midlithospheric discontinuity layer (approximately 80–100 km) was rapidly removed in <10–20 Ma. This keel delamination stage was followed by a protracted (approximately 50–100 Ma) period of convective erosion and/or lithospheric extension that thinned the remaining lithosphere and continuously reworked the former cratonic lithospheric mantle. This study focuses on numerical exploration of the well‐recorded second stage of the eastern North China Craton's lithospheric evolution. We find that (1) lithospheric mantle capped by thick crust can be locally replaced by deeper mantle material in 100 Ma due to small‐scale convective erosion; (2) asthenospheric upwelling and related extension can replace lithospheric mantle over horizontal length scales of ~50–150 km, and account for observed “mushroom‐shaped” low‐velocity structures; (3) modeling shows conditions that could lead to the multiple eastern North China Craton magmatic pulses between 190 and 115 Ma that are associated with temporal and spatial changes in magma source petrology and a magmatic hiatus; and (4) a “wet” midlithospheric discontinuity layer provides a potential source material for on‐craton magmatism.

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Section: Discussionsupporting

confidence: 90%

Section: Tectonic and Magmatic Evolution During Encc Destructionmentioning

confidence: 99%

Craton Destruction 2: Evolution of Cratonic Lithosphere After a Rapid Keel Delamination Event

Liu

Morgan

et al. 2018

JGR Solid Earth

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“…Due to the ‘slab window’ effect (Thorkelson, ) caused by the subduction of the mid‐oceanic ridge between the Late Cretaceous palaeo‐Pacific Plate and Kula Plate, or asthenosphere effect (Li et al ., ), the origin of igneous rocks in this period is completely different from those in the Late Mesozoic. The study on velocity structure of the top upper mantle under the Bohai Bay area reveals that the velocity of the Tan‐Lu Fault Zone and the Zhangjiakou‐Penglai Fault Zone (Suo et al ., ; Xue et al ., ) changes significantly, and the Moho is wavy, indicating that there is a channel of deep material upwelling (Hao et al ., ) (Fig. ).…”

Section: Mechanism Of Tectonic Migrationmentioning

confidence: 93%

Cenozoic tectonic migration in the Bohai Bay Basin, East China

Zhao

Jiang

et al. 2016

Geological Journal

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Tectonic migration is a common geological process during basin formation and development. However, there are many disputes about the tectonic migration and its dynamic mechanism in the Bohai Bay Basin. By analysis of Cenozoic tectonic, sedimentation and magmatism migration processes in the Bohai Bay Basin, combined with previous studies, the Cenozoic tectonic migration law in the Bohai Bay Basin is summarized in this paper. Affected by the subduction of the Indian Plate to the Eurasian Plate, its far‐field effect of the related eastward asthenospheric extrusion and the subduction of the Pacific Plate to the Eurasian Plate, the Cenozoic Bohai Bay Basin is characterized by the gradual northeastward and eastward/seaward migration of tectonic units. The tectonic migration is accompanied by eastward migrations and younging of faulting, depressions in the Bohai Bay Basin, depocentres and subsidence centres and magmatism. Finally, based on intraplate and plate marginal processes and mechanisms, the tectonic migration mechanism in the Cenozoic Bohai Bay Basin is discussed in this paper. The gradual migration of tectonic–sedimentary‐basin‐forming movements is younger and younger towards the east, resulting from the combined effect of the collision and subduction among the Indian Plate and the Pacific Plate to the Eurasian Plate. Copyright © 2016 John Wiley & Sons, Ltd.

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“…14 in Liu et al 2015). Liu et al (2015) and Hao et al (2013) speculated that the high-velocity bodies in the lower crust are probably the residual Yangtze crust during the continent-continental collision when the Yangtze plate subducted northward beneath the Sin-Korea plate in Early Mesozoic (Yang et al 2012), or are the remains of underplating of high-density upper-mantle eclogite representing early suturing process.…”

Section: Vertical S-wave Velocity Profilesmentioning

confidence: 99%

“…Li et al 2006;Huang et al 2009;Zhang et al 2007;Lü et al 2016;Tian et al 2009) and joint land-sea seismic surveys (e.g. Hao et al 2013;Liu et al 2015). The abovementioned studies have provided good understandings for the deep structure of the study area.…”

Section: Introductionmentioning

confidence: 97%

Crustal structure beneath Liaoning province and the Bohai Sea and its adjacent region in China based on ambient noise tomography

2017

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The velocity structure of the crust beneath Liaoning province and the Bohai sea in China was imaged using ambient seismic noise recorded by 73 regional broadband stations. All available three-component time series from the 12-month span between January and December 2013 were cross-correlated to yield empirical Green's functions for Rayleigh and Love waves. Phasevelocity dispersion curves for the Rayleigh waves and the Love waves were measured by applying the frequencytime analysis method. Dispersion measurements of the Rayleigh wave and the Love wave were then utilized to construct 2D phase-velocity maps for the Rayleigh wave at 8-35 s periods and the Love wave at 9-32 s periods, respectively. Both Rayleigh and Love phase-velocity maps show significant lateral variations that are correlated well with known geological features and tectonics units in the study region. Next, phase dispersion curves of the Rayleigh wave and the Love wave extracted from each cell of the 2D Rayleigh wave and Love wave phase-velocity maps, respectively, were inverted simultaneously to determine the 3D shear wave velocity structures. The horizontal shear wave velocity images clearly and intuitively exhibit that the earthquake swarms in the Haicheng region and the Tangshan region are mainly clustered in the transition zone between the low-and high-velocity zones in the upper crust, coinciding with fault zones, and their distribution is very closely associated with these faults. The vertical shear wave velocity image reveals that the lower crust downward to the uppermost mantle is featured by distinctly high velocities, with even a high-velocity thinner layer existing at the bottom of the lower crust near Moho in central and northern the Bohai sea along the Tanlu fault, and these phenomena could be caused by the intrusion of mantle material, indicating the Tanlu fault could be just as the uprising channel of deep materials.

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Joint land-sea seismic survey and research on the deep structures of the Bohai Sea areas

Cited by 16 publications

References 13 publications

Craton Destruction 2: Evolution of Cratonic Lithosphere After a Rapid Keel Delamination Event

Craton Destruction 2: Evolution of Cratonic Lithosphere After a Rapid Keel Delamination Event

Cenozoic tectonic migration in the Bohai Bay Basin, East China

Crustal structure beneath Liaoning province and the Bohai Sea and its adjacent region in China based on ambient noise tomography

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