Crust–mantle structure difference across the gravity gradient zone in North China Craton: Seismic image of the thinned continental crust

Zheng, Tianyu; Chen, Ling; Zhao, Liang; Xu, Weiwei; Zhu, Rixiang

doi:10.1016/j.pepi.2006.05.004

Cited by 97 publications

(68 citation statements)

References 39 publications

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“…The newly constructed seismic images using the data from these dense arrays reveal significant regional variations in the crustal and lithospheric thickness of the NCC [31][32][33][34][35][36][37][38][39][40]. In general, the eastern NCC has a thin crust (<35 km) and lithosphere (60-100 km).…”

Section: Geographical Extent Of the Ncc Destructionmentioning

confidence: 99%

Timing, scale and mechanism of the destruction of the North China Craton

Zhu

Chen

et al. 2011

Sci. China Earth Sci.

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The North China Craton (NCC) is a classical example of ancient destroyed cratons. Since the initiation of the North China Craton Destruction Project by the National Natural Science Foundation of China, numerous studies have been conducted on the timing, scale, and mechanism of this destruction through combined interdisciplinary research. Available data suggest that the destruction occurred mainly in the eastern NCC, whereas the western NCC was only locally modified. The sedimentation, magmatic activities and structural deformation after cratonization at ~1.8 Ga indicate that the NCC destruction took place in the Mesozoic with a peak age of ca 125 Ma. A global comparison suggests that most cratons on Earth are not destroyed, although they have commonly experienced lithospheric thinning; destruction is likely to occur only when the craton has been disturbed by oceanic subduction. The destruction of the NCC was coincident with globally active plate tectonics and high mantle temperatures during the Cretaceous. The subducted Pacific slab destabilized mantle convection beneath the eastern NCC, which resulted in cratonic destruction in the eastern NCC. Delamination and/or thermal-mechanical-chemical erosion resulted from the destabilization of mantle convection. timing, scale and mechanism, craton destruction, North China Craton Citation:Zhu R X, Chen L, Wu F Y, et al. Timing, scale and mechanism of the destruction

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Section: Geographical Extent Of the Ncc Destructionmentioning

confidence: 99%

Timing, scale and mechanism of the destruction of the North China Craton

Zhu

Chen

et al. 2011

Sci. China Earth Sci.

Self Cite

611

364

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“…The contrasting structure demonstrates that the Tan-Lu fault zone was operated as a vertical lithospheric shear zone, inducing stress concentration and facilitating the NCC reactivation in the Mesozoic. The crustal structural imaging beneath several temporal seismic array profiles revealed that the low velocity zones occur throughout the crust, probably in association with the voluminous Mesozoic-Cenozoic magmatism of the region [30,31] . However, the asymmetrical and dispersive distribution of the low velocity zone, would not favor the tectonic pattern of mantle plume.…”

Section: Figurementioning

confidence: 99%

Destruction geodynamics of the North China craton and its Paleoproterozoic plate tectonics

2009

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“…First, we constructed the P-and S-wave velocity models of the upper mantle at depths of 70-800 km by taking into account the recent results of high-resolution tomography [21] for the NCC, which presents velocity perturbation with respect to the IASPEI91 model as the background model. The influence of the crustal structure on the CCP image was then corrected by introducing the crustal velocity models above a depth of 70 km for each station derived from receiver function imaging [26][27][28][29]. This model is hereafter referred to as the NCC model.…”

Section: Receiver Function Imagingmentioning

confidence: 99%

Mantle dynamics of the reactivating North China Craton: Constraints from the topographies of the 410-km and 660-km discontinuities

Zheng

Zhao

2011

Sci. China Earth Sci.

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The topographies of the 410-km and 660-km discontinuities have important implications for mantle dynamics. Here we present high-resolution seismic imaging of the 410-km and 660-km discontinuities beneath the North China Craton (NCC) employing the receiver function method. Depth anomalies (deeper or shallower than the global average depths) at both discontinuities were detected by introducing a three-dimensional regional velocity model. The depressions of the 410-km discontinuity are mostly located in the eastern NCC. A local elevation of the 660-km discontinuity appeared in the northwest of the NCC and a significant depression of the 660-km discontinuity is located in the southeast of the NCC. Two dynamic mantle regimes are speculated to explain the formation of the anomalous depth zones in the NCC. One possibility is a complex mantle upwelling linked to edge-derived convection between the stagnant slab and the thick cratonic root. The other potential dynamic regime is slab stagnating, sinking, and induced upwelling at the neighboring slab front. These regimes hint that the mantle flow was possibly dominated by dynamic interactions among the subducting slab, cratonic root, and ambient mantle beneath the NCC. 410-km discontinuity, 660-km discontinuity, receiver function imaging, dynamic mantle regime, North China Craton Citation:Xu W W, Zheng T Y, Zhao L. Mantle dynamics of the reactivating North China Craton: Constraints from the topographies of the 410-km and 660-km discontinuities.The mantle transition zone (MTZ) is a hallmark structure of the mantle with important implications for geodynamics. The top and bottom discontinuities of the MTZ have been demonstrated by laboratory experiments to represent pressure-induced mineral phase transitions of olivine to wadsleyite at ~410 km and of ringwoodite to perovskite and magnesiowustite at ~660 km, respectively [1-4]. Changes in temperature or composition shift the pressure of the mineral phase transition, creating the topography of the velocity discontinuity [5,6], which can be used as an indicator of mantle dynamics. The thickened MTZ underlain by a depressed 660-km discontinuity has been generally found to occur near subduction zones and attributed to the stagnancy of the subducted slab or remnants of detached oceanic lithosphere [7][8][9][10][11][12]. The slightly thinned MTZ beneath ridges and hotspots has been attributed to the influence of thermal plumes [13,14]. Seismic-related observations of the 410-km discontinuity (hereafter referred to as 410-) have been used to interpret lateral variations in temperature and water content in the MTZ [14][15][16][17]. The "transition zone water filter" hypothesis predicts that a spatially localized layer of melt, resulting from the difference in water solubility between the MTZ and the overlying upper mantle, may pool atop the 410- [15]. The observed low-velocity layer above the 410-suggests an association between the velocity decrement and

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Crust–mantle structure difference across the gravity gradient zone in North China Craton: Seismic image of the thinned continental crust

Cited by 97 publications

References 39 publications

Timing, scale and mechanism of the destruction of the North China Craton

Timing, scale and mechanism of the destruction of the North China Craton

Destruction geodynamics of the North China craton and its Paleoproterozoic plate tectonics

Mantle dynamics of the reactivating North China Craton: Constraints from the topographies of the 410-km and 660-km discontinuities

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