Density heterogeneity of the cratonic lithosphere: A case study of the Siberian Craton

Cherepanova, Yulia; Artemieva, Irina

doi:10.1016/j.gr.2014.10.002

Cited by 34 publications

(16 citation statements)

References 87 publications

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“…The Russian (East European) platform shows a strong variability in the LM density structure, similar to the cratons of Siberia (Cherepanova & Artemieva, ; Kaban et al, ) and southern Africa (Artemieva & Vinnik, ). In agreement with earlier studies (Artemieva, , ), mantle density increases toward the southern parts of the platform, which have also experienced a fast subsidence and sedimentation since the Devonian.…”

Section: Density Of Subcontinental Lithosphere Mantle (Sclm)mentioning

confidence: 92%

“…Abundant geochemical (Agashev et al, ; Aulbach et al, ; Doucet et al, ; Griffin et al, ; Hawkesworth et al, ; Howarth et al, ; Huang et al, ; Kargin et al, ; Peslier et al, ) and geophysical data (Artemieva, ; Artemieva et al, ; Artemieva & Vinnik, ; Cherepanova & Artemieva, ) from different cratons worldwide indicate that LM in kimberlite provinces is melt‐ and water‐metasomatized. Our results indicate that the kimberlite provinces of Baltica, Greenland, and Labrador are all emplaced in regions with a low‐dense (3.32–3.33 g/cm 3 ) LM (Figure ), and nondiamondiferous kimberlites are clearly associated with a slightly denser mantle.…”

Section: Density Of Subcontinental Lithosphere Mantle (Sclm)mentioning

confidence: 99%

“…Alternatively, gravity and free‐board modeling are used to model global and regional patterns of density variations in the upper mantle (Molnar et al, ; Mooney & Vidale, ), and compositional variations in mantle density can be calculated if thermal structure of the lithospheric mantle (LM) is known. One approach involves subtracting gravitational effect of crustal heterogeneity from the observed gravity field (Artemjev et al, ; Artemieva et al, ; Herceg et al, ; Kaban & Mooney, ; Kaban et al, , ; Mooney & Kaban, ; Yegorova & Starostenko, ), and the other includes mantle density calculation from lithosphere buoyancy in regions that are close to isostatic equilibrium (Artemieva, ; Artemieva & Vinnik, ; Cherepanova & Artemieva, ; Mooney & Vidale, ). In both cases the results are critically dependent on the quality and resolution of the crustal model (Herceg et al, ; Kaban & Schwintzer, ), which necessitates the development of high‐quality regional seismic models for the crust (Artemieva & Thybo, ; Cherepanova et al, ; Grad et al, ; Kennett et al, ; Tesauro et al, ; Xia et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…Regional studies for the SCLM density structure are available for Eurasia (Artemjev et al, ), the East European craton (Artemieva, ), Europe and the North Atlantics (Yegorova & Starostenko, ), North America (Kaban & Mooney, ; Mooney & Kaban, ), Siberia (Artemieva et al, ; Cherepanova & Artemieva, ), Asia (Kaban et al, ), and southern Africa (Artemieva & Vinnik, ). The results of these studies are in overall agreement with global geochemical observations on secular variations in SCLM density (Gaul et al, ; Griffin et al, ): Cratonic LM is typically 0.5–2% less dense than the asthenospheric mantle, with significant lateral variations within and between the cratons (Griffin et al, ).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Density Of Subcontinental Lithosphere Mantle (Sclm)mentioning

confidence: 92%

Section: Density Of Subcontinental Lithosphere Mantle (Sclm)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…In the central part of the craton, it extends to a depth of about 250 km, whereas it is limited to the uppermost mantle in the southeastern region including the Aldan Shield. The density decrease reached a maximum of about 45 kg/m 3 (1.35%) in a large part of the Siberian Craton (Figure , cross‐section 2), which is somewhat less than that previously reported in studies based on interpretation of only the gravity field [e.g., Kaban et al ., ] or on the modeling of the isostatic balance of the lithosphere [ Cherepanova and Artemieva , ]. Again, this difference may be a result of the damping in the inversion.…”

Section: D Density Model Of the Upper Mantlementioning

confidence: 99%

3D density model of the upper mantle of Asia based on inversion of gravity and seismic tomography data

Kaban

Stolk

Tesauro

et al. 2016

Geochem Geophys Geosyst

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We construct a new-generation 3D density model of the upper mantle of Asia and its surrounding areas based on a joint interpretation of several data sets. A recent model of the crust combining nearly all available seismic data is employed to calculate the impact of the crust on the gravity anomalies and observed topography and to estimate the residual mantle anomalies and residual topography. These fields are jointly inverted to calculate the density variations in the lithosphere and upper mantle down to 325 km.As an initial approximation, we estimate density variations using a seismic tomography model. Seismic velocity variations are converted into temperatures and then to density variations based on mineral physics constraints. In the Occam-type inversion, we fit both the residual mantle gravity anomalies and residual topography by finding deviations to the initial model. The obtained corrections improve the resolution of the initial model and reflect important features of the mantle structure that are not well resolved by the seismic tomography. The most significant negative corrections of the upper mantle density, found in the Siberian and East European cratons, can be associated with depleted mantle material. The most pronounced positive density anomalies are found beneath the Tarim and South Caspian basins, Barents Sea, and Bay of Bengal. We attribute these anomalies to eclogites in the uppermost mantle, which have substantially affected the evolution of the basins. Furthermore, the obtained results provide evidence for the presence of eclogites in the oceanic subducting mantle lithosphere.

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Moho depth model for the Central Asian Orogenic Belt from satellite gravity gradients

2017

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The main purpose of this study is to construct a new 3‐D model of the Central Asian Orogenic Belt (CAOB) crust, which can be used as a starting point for future lithospheric studies. The CAOB is a Paleozoic accretionary orogen surrounded by the Siberian Craton to the north and the North China and Tarim Cratons to the south. This area is of great interest due to its enigmatic and still not completely understood geodynamic evolution. First, we estimate an initial crustal thickness by inversion of the vertical gravity component of the Gravity Field and Steady‐State Ocean Circulation Explorer (GOCE) and DTU10 models. Second, 3‐D forward modeling of the GOCE gravity gradients is performed, which determines the topography of the Moho, the geometry, and the density distribution of the deeper parts of the CAOB and its surroundings, taking into account the lateral and vertical density variations of the crust. The model is constrained by seismic refraction, reflection, and receiver function studies and geological studies. In addition, we discuss the isostatic implications of the differences between the seismic Moho and the resulting 3‐D gravity Moho, complemented by the analysis of the lithostatic load distribution at the upper mantle level. Finally, the correlation between the contrasting tectonic domains and the thickness of the crust reveals the inheritance of Paleozoic and Mesozoic geodynamics, particularly the magmatic provinces and the orocline which preserve their crustal features.

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Density heterogeneity of the cratonic lithosphere: A case study of the Siberian Craton

Cited by 34 publications

References 87 publications

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

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

3D density model of the upper mantle of Asia based on inversion of gravity and seismic tomography data

Moho depth model for the Central Asian Orogenic Belt from satellite gravity gradients

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