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

Xia, Bing; Thybo, Hans; Artemieva, Irina

doi:10.1002/2016jb013848

Cited by 38 publications

(38 citation statements)

References 81 publications

(142 reference statements)

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“…Calculation of RMGA requires knowledge on the gravitational effect of the crust, which can be calculated from the crustal density model NCcrust (Xia et al, 2017). However, the next step, calculation of mantle density anomalies, requires additional information on the thickness of the layer to which the density anomalies are confined.…”

Section: Lm Thicknessmentioning

confidence: 99%

“…Journal of Geophysical Research: Solid Earth nearly uniform average crustal velocity and density (Xia et al, 2017), so that the difference between the Bouguer plate approximation and the full 3-D solution is also small (Shulgin & Artemieva, 2019). Due to the small density contrast across the LAB and its large depth, the 3-D gravitational effects from the LAB are insignificant.…”

Section: 1029/2020jb020296mentioning

confidence: 99%

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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: Lm Thicknessmentioning

confidence: 99%

Section: 1029/2020jb020296mentioning

confidence: 99%

Lithosphere Mantle Density of the North China Craton

2020

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“…Kaban et al, 2003Kaban et al, , 2016Mooney & Kaban, 2010;Yegorova & Starostenko, 2002), and the other includes mantle density calculation from lithosphere buoyancy in regions that are close to isostatic equilibrium (Artemieva, 2003;Artemieva & Vinnik, 2016;Cherepanova & Artemieva, 2015;Mooney & Vidale, 2003). In both cases the results are critically dependent on the quality and resolution of the crustal model (Herceg et al, 2016;Kaban & Schwintzer, 2001), which necessitates the development of highquality regional seismic models for the crust Cherepanova et al, 2013;Grad et al, 2009;Kennett et al, 2011;Tesauro et al, 2014;Xia et al, 2017). For example, a global gravity modeling demonstrated the presence of strong low-density anomalies (−0.10-0.05 g/cm 3 ) in the subcontinental lithospheric mantle (SCLM) of the cratons (Kaban et al, 2003), but the resolution is insufficient to resolve reliably intracratonic density variations due to limitations of a global model of the crustal structure used in calculations.…”

Section: Introductionmentioning

confidence: 99%

Thermochemical Heterogeneity and Density of Continental and Oceanic Upper Mantle in the European‐North Atlantic Region

Shulgin

Artemieva

2019

JGR Solid Earth

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We present a new model, EUNA‐rho, for the density structure of the continental and oceanic upper mantle based on 3‐D tesseroid gravity modeling. On continent, there is no clear difference in lithospheric mantle (LM) density between the cratonic and Phanerozoic Europe, yet an ~300‐km‐wide zone of a high‐density LM along the Trans‐European Suture Zone may image a paleosubduction. Kimberlite provinces of the Baltica and Greenland cratons have a low‐density (3.32 g/cm3) mantle where all non‐damondiferous kimberlites tend to a higher‐density (3.34 g/cm3) anomalies. LM density correlates with the depth of sedimentary basins implying that mantle densification plays an important role in basin subsidence. A very dense (3.40–3.45 g/cm3) mantle beneath the superdeep platform basins and the East Barents shelf requires the presence of 10–20% of eclogite, while the West Barents Basin has LM density of 3.35 g/cm3 similar to the Variscan massifs of western Europe. In the North Atlantics, south of the Charlie Gibbs fracture zone (CGFZ) mantle density follows half‐space cooling model with significant deviations at volcanic provinces. North of the CGFZ, the entire North Atlantics is anomalous. Strong low‐density LM anomalies (< −3%) beneath the Azores and north of the CGFZ correlate with geochemical anomalies and indicate the presence of continental fragments and heterogeneous melting sources. Thermal anomalies in the upper mantle averaged down to the transition zone are 100–150 °C at the Azores and can be detected seismically, while a <50 °C anomaly around Iceland is at the limit of seismic resolution.

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“…Instead, a highvelocity anomaly appears (Figures 9e and 9f). Previous studies such as the thermal structure of the lithosphere across the YSFZ (Lai et al, 2007;Zu et al, 1996), the Moho discontinuities topography using receiver function methods (Chen et al, 2006), and wide-angle seismic profiles (Jia et al, 2014;Li et al, 2011;Xia et al, 2017) indicate that the YSFZ has the features of mantle uplift and crustal thinning. One is that the HVZ corresponds to juvenile lower crust resulting from the basalt underplating at the bottom of the Moho.…”

Section: Geochemistry Geophysics Geosystemsmentioning

confidence: 96%

Ambient Noise Tomography of the Shandong Province and its Implication for Cenozoic Intraplate Volcanism in Eastern China

Chen

Dong

et al. 2018

Geochem Geophys Geosyst

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New images of shear wave velocity (VS) structure of the crust and uppermost mantle in the Shandong province of China are presented based on inversion of ambient seismic noise data from 47 broadband stations. Interstation Rayleigh wave phase‐velocity dispersion curves for periods of 1–40 s are obtained from noise cross correlations between stations. Two‐dimensional phase‐velocity maps at periods of 5–30 s are obtained by tomographic inversion of these dispersion curves, which are then inverted for 3‐D Vs heterogeneity to ~80‐km depth. Our results show clear indications of Moho uplift and crustal thinning beneath the northern segment of the Yishu fault zone and the Jiaobei uplift, thus providing seismological evidence for the steep geometry and deep penetration of the fault system. Instead of large‐scale, low‐velocity anomalies beneath eastern China as imaged by previous regional tomography, our high‐resolution Vs results reveal fine‐scale focused low‐velocity anomalies beneath the isolated Cenozoic basalts. There are strong spatial correlations between the narrow low Vs zones in the uppermost mantle and the thinned crust, as well as the locations of the isolated Cenozoic volcanism in the study area. Our results suggest that the asthenosphere upwelling possibly originating from the stagnant Pacific slab is focused into localized features at 50‐ to 80‐km depth that supply the isolated Cenozoic volcanoes of the eastern China continental margin.

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

Cited by 38 publications

References 81 publications

Lithosphere Mantle Density of the North China Craton

Lithosphere Mantle Density of the North China Craton

Thermochemical Heterogeneity and Density of Continental and Oceanic Upper Mantle in the European‐North Atlantic Region

Ambient Noise Tomography of the Shandong Province and its Implication for Cenozoic Intraplate Volcanism in Eastern China

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