Long memory of mantle lithosphere fabric — European LAB constrained from seismic anisotropy

Plomerová, Jaroslava; Babuška, Vladislav

doi:10.1016/j.lithos.2010.01.008

Cited by 108 publications

(80 citation statements)

References 79 publications

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“…Moreover, a sharp transition from low to high shear-wave velocities between the Phanerozoic Europe and EEC, respectively, was observed from waveform inversion of both body and surface waves by Zielhuis and Nolet (1994). We also indicate that the LAB is more distinct beneath the Phanerozoic part of Europe than beneath the Precambrian part, which coincides with the results by Plomerova and Babuska (2010) and Knapmeyer-Endrun et al (2013b).…”

Section: Resultssupporting

confidence: 91%

Upper mantle structure around the Trans-European Suture Zone obtained by teleseismic tomography

et al. 2015

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Abstract. The presented study aims to resolve the upper mantle structure around the Trans-European Suture Zone (TESZ), which is the major tectonic boundary in Europe. The data of 183 temporary and permanent seismic stations operated during the period of the PASsive Seismic Experiment (PASSEQ) 2006-2008 within the study area from Germany to Lithuania was used to compile the data set of manually picked 6008 top-quality arrivals of P waves from teleseismic earthquakes. We used the TELINV nonlinear teleseismic tomography algorithm to perform the inversions. As a result, we obtain a model of P wave velocity variations up to about ±3 % with respect to the IASP91 velocity model in the upper mantle around the TESZ. The higher velocities to the east of the TESZ correspond to the older East European Craton (EEC), while the lower velocities to the west of the TESZ correspond to younger western Europe. We find that the seismic lithosphere-asthenosphere boundary (LAB) is more distinct beneath the Phanerozoic part of Europe than beneath the Precambrian part. To the west of the TESZ beneath the eastern part of the Bohemian Massif, the Sudetes Mountains and the Eger Rift, the negative anomalies are observed from a depth of at least 70 km, while under the Variscides the average depth of the seismic LAB is about 100 km. We do not observe the seismic LAB beneath the EEC, but beneath Lithuania we find the thickest lithosphere of about 300 km or more. Beneath the TESZ, the asthenosphere is at a depth of 150-180 km, which is an intermediate value between that of the EEC and western Europe. The results imply that the seismic LAB in the northern part of the TESZ is in the shape of a ramp dipping to the northeasterly direction. In the southern part of the TESZ, the LAB is shallower, most probably due to younger tectonic settings. In the northern part of the TESZ we do not recognize any clear contact between Phanerozoic and Proterozoic Europe, but further to the south we may refer to a sharp and steep contact on the eastern edge of the TESZ. Moreover, beneath Lithuania at depths of 120-150 km, we observe the lower velocity area following the boundary of the proposed paleosubduction zone.

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Section: Resultssupporting

confidence: 91%

Upper mantle structure around the Trans-European Suture Zone obtained by teleseismic tomography

et al. 2015

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“…in the Precambrian region since then, neither on a European scale (Amaru et al, 2008), nor in regional tomography studies based on data of temporary arrays in several regions of Fennoscandia (e.g., Plomerová et al, 2001;Sandoval et al, 2004;Shomali et al, 2002;Eken et al, 2007Eken et al, , 2008. The most significant velocity changes in the upper mantle beneath Precambrian provinces can be related to lateral changes of depth of the lithosphere-asthenosphere boundary (Calcagnile 1991;Cotte et al, 2002;Plomerová et al, 2002Plomerová et al, , 2008Plomerová et al, , 2010Olsson et al, 2007). On the other hand, studies of fossil anisotropy in most of Fennoscandia (except of its northern part) allowed us to map individual domains of mantle lithosphere with their own consistent fabrics.…”

Section: With Amentioning

confidence: 99%

“…4). Thickness of the mantle lithosphere domains is set to 100 km, according to the LAB depth estimates by Plomerová and Babuška (2010). The authors define the lithosphere-asthenosphere boundary as a transition between the fossil anisotropy within the mantle lithosphere and anisotropy related to the presentday flow in the underlying mantle, also detectable in surfacewave polarization (radial) and azimuthal anisotropy ; see also Gung et al, 2003).…”

Section: Modelling the Mantle Lithosphere Domains Delimited By Body-wmentioning

confidence: 99%

Domains of Archean mantle lithosphere deciphered by seismic anisotropy – inferences from the LAPNET array in northern Fennoscandia

Plomerová¹,

Vecsey²,

Babuška³

2011

Solid Earth

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Abstract.An international LAPNET array (2007-2009, http://www.oulu.fi/sgo-oty/lapnet) of the POLENET/LAPNET sub-project of the POLENET-IPY consortium, related to seismic and geodetic studies in the Arctic regions, consisted of about 60 broadband seismic stations located on the territory of northern Finland and adjacent parts of Sweden, Norway and Russia. We analyze relative P-wave travel-time deviations evaluated for a subset of 90 teleseismic events recorded by the LAPNET array and show examples of lateral variations of shear-wave splitting to demonstrate variability of fabrics of the Archean mantle lithosphere. The initial results clearly demonstrate the Archean mantle lithosphere consists of domains with consistent fabrics reflecting fossil anisotropic structures. 3-D self-consistent anisotropic models with inclined symmetry axes accommodate two independent sets of body-wave anisotropic observations. Individual domains are delimited by boundaries (sutures), where the anisotropic parameters change. The results obtained from the LAPNET array fill a gap in structural studies of the upper mantle beneath northern Fennoscandia.

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“…We suggest that the misfit between observed V s values and the reasonable rocks compositions is the result of the isotropic approach to the problem. Both the Scania mantle xenoliths descriptions of Rehfeldt et al (2007) and large-scale models of Plomerová and Babuška (2010) show the anisotropy of mantle peridotites, which supposedly affects significantly our seismic velocity measurements.…”

Section: Discussionmentioning

confidence: 99%

“…The eastern margin of EEC in the northern part of Poland and adjoining part of the Baltic Sea and Scania is characterized by the LAB dipping steeply to the NE from about 120 km to around 200 km (Wilde-Piórko et al 2010;Plomerová and Babuška 2010). The Phanerozoic nature of the lithospheric mantle beneath Scania is demonstrated by xenoliths occurring in Jurassic (177 Ma; Tappe et al 2016) basanites.…”

Section: Discussionmentioning

confidence: 99%

The geophysical characteristic of the lower lithosphere and asthenosphere in the marginal zone of the East European Craton

Grad

Puziewicz

Majorowicz³

et al. 2018

Int J Earth Sci (Geol Rundsch)

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Seismic P-and S-wave velocities of the lower lithosphere and underlying asthenosphere at the SW margin of the East European Craton in northern Poland were obtained with different seismic techniques: seismic refraction, P-residuals of the first arrivals from teleseismic earthquakes, P-wave receiver function, and inversion of the Rayleigh surface wave dispersion curves, the last two using data collected in the passive seismic experiment "13 BB star". The uniform array consisted of 13 stations deployed in a 120 km in diameter area. Below the depth of 180-220 km a decrease of about 6% of the S-wave velocity is interpreted as a thermal gradient zone corresponding to a lithosphere-asthenosphere transition. The average mantle velocities down to a depth of 300 km beneath the array are relatively high, exceeding values for other Precambrian cratons by 0.1-0.2 km/s, and cannot be modeled by reasonable mantle peridotite compositions in the lithospheric part of the profile. We suggest that significant peridotite anisotropy could explain the misfit between measured and calculated seismic velocities in the lithosphere.

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Long memory of mantle lithosphere fabric — European LAB constrained from seismic anisotropy

Cited by 108 publications

References 79 publications

Upper mantle structure around the Trans-European Suture Zone obtained by teleseismic tomography

Upper mantle structure around the Trans-European Suture Zone obtained by teleseismic tomography

Domains of Archean mantle lithosphere deciphered by seismic anisotropy – inferences from the LAPNET array in northern Fennoscandia

The geophysical characteristic of the lower lithosphere and asthenosphere in the marginal zone of the East European Craton

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