Uppermost mantle structure of the North China Craton: Constraints from interstation Pn travel time difference tomography

Li, Zhiwei; Hao, Tianyao; Xu, Ya

doi:10.1007/s11434-011-4487-y

Cited by 28 publications

(10 citation statements)

References 38 publications

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“…However, in the western portion of eastern NCC, the present tomographic model shows an obvious arc‐shaped high‐V anomaly (“Re,” Figures 13a–13c, 14b–14e, and 14g). This feature confirms what was already observed by previous studies [e.g., Tian et al , 2009; Zhao et al , 2009; Li et al , 2011], although there exist some differences in details between the present work and previous results. Tian et al [2009] showed an approximate north‐south trending high‐V anomaly extending down to only 300 km depth, while Zhao et al [2009] showed a weaker high‐V anomaly extending down to the mantle transition zone.…”

Section: Discussionsupporting

confidence: 91%

“… Tian et al [2009] showed an approximate north‐south trending high‐V anomaly extending down to only 300 km depth, while Zhao et al [2009] showed a weaker high‐V anomaly extending down to the mantle transition zone. Li et al [2011] also showed a prominent high‐V anomaly in a relatively small area in the uppermost mantle, due to using only Pn arrival‐time data. In contrast, the present results show a strong high‐V anomaly only above 200 km depth (“Re,” Figures 13a–13c, 14b–14e, and 14g), which has been demonstrated to be robust by extensive resolution tests (Figures 11, 12, 15, and 16).…”

Section: Discussionmentioning

confidence: 99%

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Upper‐mantle tomography and dynamics beneath the North China Craton

Lei

2012

J. Geophys. Res.

101

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[1] A high-resolution tomographic model of the upper mantle beneath the North China Craton (NCC) is determined using a large number of precisely hand-picked teleseismic P wave arrival times. The results are generally consistent with previous results but high-quality arrivals provide new insights into the dynamics beneath the NCC. Obviously north-south trending low-velocity (low-V) zones are revealed down to $300-400 km depth under the Shanxi rift and Tanlu fault zone, while a north-south trending high-velocity (high-V) zone representing the remainder of detached lithosphere is visible down to $200 km depth under the western portion of eastern NCC. High-V anomalies representing the detached lithosphere are detected at 200-400 km depth under central and eastern NCC. Under the Ordos block high-V anomalies are visible above $400 km depth, indicating intact lithosphere. Broad high-V anomalies representing the stagnant Pacific slab are imaged with a low-V anomaly from Datong volcano to the edge of Bohai Sea in the mantle transition zone beneath eastern and central NCC, suggesting that the Pacific slab has subducted to central NCC but with a gap. A continuously Y-shaped low-V structure is clearly imaged under Datong volcano and Bohai Sea from the lower mantle through this gap in the mantle transition zone to the upper mantle, indicating the existence of a lower mantle plume. These results suggest that in addition to the subduction of the Pacific plate, the plume has also played an important role in lithospheric destruction by thermal erosion of the asthenosphere and detachment of the lithosphere beneath the NCC.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Upper‐mantle tomography and dynamics beneath the North China Craton

Lei

2012

J. Geophys. Res.

101

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“…These studies include body wave tomography of the mantle [e.g., Lebedev and Nolet , 2003; Huang and Zhao , 2006; Zhao , 2009; Tian et al , 2009; Xu and Zhao , 2009; Li and van der Hilst , 2010; Santosh et al , 2010] and of the crust [e.g., Sun and Toksöz , 2006]. Pn tomography [ Li et al , 2011], receiver functions analyses [ Zheng et al , 2006; Chen et al , 2009], and shear wave splitting studies have also been performed [ Zhao et al , 2008; Bai et al , 2010; Li and Niu , 2010]. Recent body wave results have focused mainly on the eastern part of the NCC, including efforts to image its thin intact lithosphere as well as the potential remnants of the delaminated lithosphere near 400 km depth [e.g., Chen et al , 2009; Xu and Zhao , 2009].…”

Section: Introductionmentioning

confidence: 99%

Crust and uppermost mantle beneath the North China Craton, northeastern China, and the Sea of Japan from ambient noise tomography

Zheng

Shen

Zhou³

et al. 2011

J. Geophys. Res.

151

128

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A 3‐D shear velocity model of the crust and uppermost mantle to a depth of 100 km is presented beneath the North China Craton (NCC), northeastern China, the Korean Peninsula, and the Sea of Japan. Ambient noise Rayleigh wave tomography is applied to data from more than 300 broadband seismic stations from Chinese provincial networks (CEArray), the Japanese F‐Net, and the IRIS Global Seismic Network. Continuous data from 2007 to 2009 are used to produce group and phase velocity maps from 8 s to 45 s periods. The model is motivated to constrain the distributed intraplate volcanism, crustal extension, cratonic rejuvenation, and lithospheric thinning that are hypothesized for the study region. Numerous robust features are observed that impose new constraints on the geometry of these processes, but discussion concentrates only on four. (1) The North‐South Gravity Lineament follows the ∼40 km contour in crustal thickness, and crustal thickness is anticorrelated with water depth beneath the Sea of Japan, consistent with crustal isostasy for a crust with laterally variable composition. (2) The lithosphere is thin (∼70 km) beneath the Songliao‐Bohai Graben but seismically fast. (3) Even thinner more attenuated lithosphere bounds three sides of the eastern NCC (in a horseshoe shape), identifying a region of particularly intense tectonothermal modification where lithospheric rejuvenation may have reached nearly to the base of the crust. (4) Low‐velocity anomalies reach upward (in a Y shape) in the mantle beneath the eastern and western borders of the Sea of Japan, extending well into continental East Asia in the west, and are separated by a ∼60 km thick lithosphere beneath the central Sea of Japan. This anomaly may reflect relatively shallow slab dehydration in the east and in the west may reflect deeper dehydration and convective circulation in the mantle wedge overlying the stagnant slab.

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“…The lithosphere thickness of the Bohai Sea is about 65∼80 km [1] . The Pn velocity structure of North China [10] also shows that the Pn velocity is decreased in Qikou sag, Shaleitian uplift and Bozhong sag. The Pn velocity structure reflects the average velocity structure within the top zone of the upper mantle.…”

Section: The Upper Mantle (Lithosphere) Structurementioning

confidence: 90%

“…In contrast, because of the difficulties of marine geophysical survey, the geophysical study of the Bohai Sea mainly uses the seismic exploration for shallow targets and the seismic tomography for deep structure [9,10] . The present studies can not reflect the detailled structure of the middle and deep crust.…”

Section: Introductionmentioning

confidence: 99%

Crustal and Mantle Structure of the Bohai Bay Area Based on Gravity and Magnetic Data

Hao

Huang

et al. 2011

Chinese J of Geophysics

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Bohai bay basin is the center area of the destruction of North China Craton (NCC). The deep structure study of the Bohai Sea plays a key role in understanding the scope and dynamic process of the destruction of NCC. In this paper, we studied the crustal structure of the profile from Xincheng, Jinghai, to Bohai Sea along the southeast direction based on the gravity and magnetic data. The initial model was build based on the former studies about the sedimentary structure, deep crustal structure and the onshore‐offshore seismic survey in 2010. Combined with the density and magnetic susceptibility parameters in this area, the crustal structure and the physical parameter distribution were determined using 2.5D gravity and magnetic inversion method. The integrated study indicates that the Moho becomes shallower from the land to the sea. The Moho of the Bohai Sea is shallower, and has a local uplift in Shaleitian area with about 2 km uplift. The variation of the Moho is similar with the lithosphere thinning in the eastern NCC. It reflects that lithosphere and deep crustal structure were similarly affected by the destruction of the NCC from Mesozoic. We do the deep uplifting modeling to test the gravity effects from the mantle uplifting. Combined with the analysis of the gravity of the profile, it is less likely to have mantle plume or large mantle uplifting in the Bohai Sea, the local small uplifting of the Moho in Bohai Sea is likely related with a small anomaly body in the upper mantle.

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Uppermost mantle structure of the North China Craton: Constraints from interstation Pn travel time difference tomography

Cited by 28 publications

References 38 publications

Upper‐mantle tomography and dynamics beneath the North China Craton

Upper‐mantle tomography and dynamics beneath the North China Craton

Crust and uppermost mantle beneath the North China Craton, northeastern China, and the Sea of Japan from ambient noise tomography

Crustal and Mantle Structure of the Bohai Bay Area Based on Gravity and Magnetic Data

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