Mesozoic(?) lithosphere-scale buckling of the East European Craton in southern Ukraine: DOBRE-4 deep seismic profile

Starostenko, V. I.; Janik, Tomasz; Lysynchuk, Dmytro; Środa, Piotr; Czuba, Wojciech; Kolomiyets, Katerina; Aleksandrowski, Paweł; Gintov, О.B.; Omelchenko, Victor; Komminaho, Kari; Guterch, A.; Tiira, Timo; Gryn, Dmytro; Legostaeva, О. V.; Thybo, Hans; Tolkunov, A.

doi:10.1093/gji/ggt292

Cited by 34 publications

(36 citation statements)

References 47 publications

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“…Mechanisms that try to explain tectonic uplift of a region are therefore varied and controversial. Dynamic support by a deep mantle plume [e.g., Nyblade and Sleep, 2003], buoyancy generated by thermal expansion of heated lithosphere [e.g., Roy et al, 2009], permanent isostatic uplift from mafic underplating of the crust [e.g., Persano et al, 2007], removal of lithospheric material by delamination and/or erosion [e.g., Bao et al, 2014], rift-flank uplift followed by flow of the lower crust [e.g., Kusznir and Karner, 2007], and basin inversion or buckling due to tectonic stresses [Starostenko et al, 2013;Marques et al, 2014] are among the models that have been invoked.…”

Section: Introductionmentioning

confidence: 99%

Crustal structure of the eastern Borborema Province, NE Brazil, from the joint inversion of receiver functions and surface wave dispersion: Implications for plateau uplift

2015

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We investigate the crustal structure of the Borborema Province of NE Brazil by developing 44 S wave velocity‐depth profiles from the joint inversion of receiver functions and fundamental mode, Rayleigh wave group velocities. The Borborema Province is located in the northeasternmost corner of the South American continent and represents a portion of a larger Neoproterozoic mobile belt that formed during the Brasiliano‐Pan African orogeny. Extensional processes in the Mesozoic—eventually leading to the separation of Africa and South America—left a number of aborted rift basins in the continental interiors, and episodes of diffuse intraplate volcanism and uplift marked the evolution of the Province after continental breakup. Our velocity‐depth profiles reveal the existence of two crustal types in the Province: (i) the thin crustal type, which consists of 30–32.5 km thick crust, with an upper layer of 3.4–3.6 km/s overlying a lower layer of 3.7–3.8 km/s and (ii) the thick crustal type, which consists of a 35–37.5 km thick crust, with velocities between 3.5 and 3.9 km/s down to ∼30 km depth and a gradational increase in velocity (VS≥4.0 km/s) down to upper mantle depths. The crustal types correlate well with topography, with the thick crustal type being mainly found in the high‐standing southern Borborema Plateau and the thin crustal type being mostly found in the low‐lying Sertaneja depression and coastal cuestas. Interestingly, the thin crustal type is also observed under the elevated topography of the northern Plateau. We argue that the thick crustal type is rheologically strong and not necessarily related to postbreakup mantle processes, as it is commonly believed. We propose that extensional processes in the Mesozoic stretched portions of the Brasiliano crust and formed the thin crustal type that is now observed in the regions of low‐lying topography, leaving the rheologically strong thick crust of the southern Plateau at higher elevations. The crust making the northern Plateau would have thinned and subsided during Mesozoic extension as part of a greater Sertaneja depression, to then experience uplift in the Cenozoic and achieve its present elevation.

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Section: Introductionmentioning

confidence: 99%

Crustal structure of the eastern Borborema Province, NE Brazil, from the joint inversion of receiver functions and surface wave dispersion: Implications for plateau uplift

2015

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“…This method yields the distributions of the seismic velocities, reveals variations in the thickness and the fault-block structure of the crust, identifies the waveguides and core-to-mantle transition zones; i.e., it reconstructs the structure IZVESTIYA of the deep tectonic zones in the upper part of the lithosphere. At the first stage of the interpretation of the DOBRE-4 seismic data (Starostenko et al, 2013), he Moho topography was accounted for by the hypothetical crumpling of the cold lithosphere with the relatively strong mantle based on the hypothesis of biharmonic uncoupled folding (Cloetingh et al, 1999). In the present work, the analysis of the geological nature of the velocity section on the DOBRE-4 profile is based on the plate tectonic model of the evolution of the lithosphere.…”

Section: Introductionmentioning

confidence: 99%

“…This paper addresses the results of the deep seismic sounding (DSS) experiment DOBRE-4 (Starostenko et al, 2013) conducted in Ukraine in 2009, which was aimed at studying the overall structure of the Earth's crust and upper mantle within the southeastern part of the East European platform (EEP), including its tran-sition to the Trans-European suture zone. The wideangle seismic reflection and refraction (WARR) method is a reliable and sufficiently accurate instrument for achieving this objective.…”

Section: Introductionmentioning

confidence: 99%

Crustal and upper mantle velocity model along the DOBRE-4 profile from North Dobruja to the central region of the Ukrainian Shield: 1. seismic data

Janik

Gintov

Lysynchuk

et al. 2017

Izv., Phys. Solid Earth

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Abstract⎯For studying the structure of the lithosphere in southern Ukraine, wide-angle seismic studies that recorded the reflected and refracted waves were carried out under the DOBRE-4 project. The field works were conducted in October 2009. Thirteen chemical shot points spaced 35-50 km apart from each other were implemented with a charge weight varying from 600 to 1000 kg. Overall 230 recording stations with an interval of 2.5 km between them were used. The high quality of the obtained data allowed us to model the velocity section along the profile for P-and S-waves. Seismic modeling was carried out by two methods. Initially, trial-and-error ray tracing using the arrival times of the main reflected and refracted P-and S-phases was conducted. Next, the amplitudes of the recorded phases were analyzed by the finite-difference full waveform method. The resulting velocity model demonstrates a fairly homogeneous structure from the middle to lower crust both in the vertical and horizontal directions. A drastically different situation is observed in the upper crust, where the Vp velocities decrease upwards along the section from 6.35 km/s at a depth of 15-20 km to 5.9-5.8 km/s on the surface of the crystalline basement; in the Neoproterozoic and Paleozoic deposits, it diminishes from 5.15 to 3.80 km/s, and in the Mesozoic layers, it decreases from 2.70 to 2.30 km/s. The subcrustal Vp gradually increases downwards from 6.50 to 6.7-6.8 km/s at the crustal base, which complicates the problem of separating the middle and lower crust. The Vp velocities above 6.80 km/s have not been revealed even in the lowermost part of the crust, in contrast to the similar profiles in the East European Platform. The Moho is clearly delineated by the velocity contrast of 1.3-1.7 km/s. The alternating pattern of the changes in the Moho depths corresponding to Moho undulations with a wavelength of about 150 km and the amplitude reaching 8 to 17 km is a peculiarity of the velocity model.

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“…The DOBRE-4 WARR profile (Starostenko et al 2013) was realized in southern Ukraine in 2009. The experiment was aimed at investigating the structure of the crust and uppermost mantle at the southwestern corner of the East European Craton (the East European Platform and Ukrainian Shield), at its transition into the Trans-European Suture Zone (TESZ).…”

Section: Introductionmentioning

confidence: 99%

Various Approaches to Forward and Inverse Wide-Angle Seismic Modelling Tested on Data from DOBRE-4 Experiment

et al. 2016

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The interpretation of seismic refraction and wide angle reflection data usually involves the creation of a velocity model based on an inverse or forward modelling of the travel times of crustal and mantle phases using the ray theory approach. The modelling codes differ in terms of model parameterization, data used for modelling, regularization of the result, etc. It is helpful to know the capabilities, advantages and limitations of the code used compared to others. This work compares some popular 2D seismic modelling codes using the dataset collected along the seismic wide-angle profile DOBRE-4, where quite peculiar/uncommon reflected phases were observed in the wavefield. The ~505 km long profile was realized in southern Ukraine in 2009, using 13 shot points and 230 recording stations. Double P M P phases with a different reduced time (7.5-11 s) and a different apparent velocity, intersecting each other, are observed in the seismic wavefield. This is the most striking feature of the data. They are interpreted as reflections from strongly dipping Moho segments with an opposite dip. Two steps were used for the modelling. In the previous work by Starostenko et al. (2013), the trial-and-error forward model based on refracted

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Mesozoic(?) lithosphere-scale buckling of the East European Craton in southern Ukraine: DOBRE-4 deep seismic profile

Cited by 34 publications

References 47 publications

Crustal structure of the eastern Borborema Province, NE Brazil, from the joint inversion of receiver functions and surface wave dispersion: Implications for plateau uplift

Crustal structure of the eastern Borborema Province, NE Brazil, from the joint inversion of receiver functions and surface wave dispersion: Implications for plateau uplift

Crustal and upper mantle velocity model along the DOBRE-4 profile from North Dobruja to the central region of the Ukrainian Shield: 1. seismic data

Various Approaches to Forward and Inverse Wide-Angle Seismic Modelling Tested on Data from DOBRE-4 Experiment

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