Seismic Anisotropy and Velocity Variations in the Mantle beneath the Saxothuringicum-Moldanubicum Contact in Central Europe

Plomerová, Jaroslava; Babuška, Vladislav; Šı́lený, Jan; Horálek, Josef

doi:10.1007/s000240050118

Cited by 46 publications

(55 citation statements)

References 27 publications

(56 reference statements)

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“…We study a relation between the distribution of the geodynamic phenomena -namely the crustal seismicity, Quaternary volcanoes and escape centers of mantle gases, and the fabric of the mantle lithosphere derived from seismic anisotropy and the lithosphere thickness (Babuška and Plomerová, 1992;Plomerová et al, 1998). Both the large-scale seismological observations (e.g., Babuška and Plomerová, 2000;Plomerová et al, 2005) and the calculated compressional and shear wave anisotropies of lherzolite xenoliths, which average 8% and 6% (Christensen et al, 2001), demonstrate the existence of anisotropy in the mantle lithosphere of the BM.…”

Section: Structure Of the Mantle Lithospherementioning

confidence: 99%

“…The ER developed only between the TBU and ST and did not continue as a morphologic feature to the west. The rift-related volcanism continues westward, where the ST is juxtaposed against the MD in a broad contact indicating a paleosubduction of the ST, possibly with a piece of oceanic lithosphere (Plomerová et al, 1998), beneath the MD. On the other hand, the crystalline basement in the western ER belongs to the ST unit (Mlčoch, 2003 and A shift of the boundaries of the ST, TBU and MD, mapped on the crystalline surface (Mlčoch, 2003;Kachlík, 1997), from their mantle counterparts determined from seismic anisotropy Figs.…”

Section: Interplay Of Three Micro-continentsmentioning

confidence: 99%

See 1 more Smart Citation

Intraplate seismicity in the western Bohemian Massif (central Europe): A possible correlation with a paleoplate junction

Babuška¹,

Plomerová²,

Fischer³

2007

Journal of Geodynamics

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Please cite this article as: Babuška, V., Plomerová, J., Fischer, T., Intraplate seismicity in the western Bohemian Massif (central Europe): A possible correlation with a paleoplate junction, Journal of Geodynamics (2007Geodynamics ( ), doi:10.1016Geodynamics ( /j.jog.2007 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Section: Structure Of the Mantle Lithospherementioning

confidence: 99%

Section: Interplay Of Three Micro-continentsmentioning

confidence: 99%

Intraplate seismicity in the western Bohemian Massif (central Europe): A possible correlation with a paleoplate junction

Babuška¹,

Plomerová²,

Fischer³

2007

Journal of Geodynamics

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“…The Variscan orogeny from the late Silurian to early Carboniferous resulted in a junction of three paleomicrocontinents: Saxothuringian, Moldanubian and Tepla-Barrandian, in the territory of Vogtland and northwestern Bohemia (Franke and Zelazniewicz, 2000). The Saxothuringian is juxtaposed with the Moldanubian in a broad contact indicating a paleosubduction of the Saxothuringian, possibly with a piece of the oceanic lithosphere beneath the Moldanubian (Plomerova et al, 1998). The "triple junction" resulted in the crust and lithosphere thinning as well as the tectono-sedimentary evolution of the Cheb Basin situated above the junction.…”

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confidence: 99%

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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“…4) indicate a detachment of the rigid upper crust from the lower crust and the mantle lithosphere ) and a very complicated geometry of the boundaries of the units . Occurrences of Cenozoic sediments and volcanics in Bavaria (e.g., Kämpf et al 2005) clearly indicate a (Plomerová et al 1998), similar to that beneath the ER proper east of the CHB (Fig. 1), the asymmetric graben morphology (e.g., Grygar et al 2006) did not develop above the broad slanting contact of both units.…”

Section: Tectonic Predisposition Of the Ohře (Eger) Riftmentioning

confidence: 95%

“…During the Early Viséan (~340 Ma), a significant vertical uplift of more than 10 km in the NW segment resulted in the juxtaposition of upper-crustal rocks of the TB unit against lower-crustal rocks of the Ohře Crystalline Complex (Zulauf et al 2002). Divergently dipping fabrics of the ST and MD mantle lithospheres were recognized throughout the whole BO-HEMA array ) and also modelled in the westernmost rim of the BM in Bavaria (Plomerová et al 1998), where both units juxtapose each other. The most prominent feature of the lithosphere section is the location of the CHB and the western ER above the transition between the ST and TB mantle lithospheres.…”

Section: Tectonic Predisposition Of the Ohře (Eger) Riftmentioning

confidence: 96%

Mantle lithosphere control of crustal tectonics and magmatism of the western Ohře (Eger) Rift

Babuška¹,

Plomerová²

2012

J. Geosci.

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This paper summarizes our recent research on the relationship between tectonics of the mantle lithosphere and of the upper crust in the western Bohemian Massif. The rejuvenated Variscan junction of three mantle domains, the Saxothuringian, Moldanubian and Teplá-Barrandian, delimited by different orientation of seismic anisotropy reflecting a consistent fossil olivine orientation and belonging to originally separated microplates, plays important role in the crustal architecture of the region. The crust above the mantle junction is the most active part of the BM characterized by periodic earthquake swarms and mofettes emitting gases of mantle origin. Detected offsets of surface boundaries of the three units from their mantle counterparts indicate a detachment of the rigid upper crust from the mantle lithosphere. Locations of major tectonic features like the Ohře (Eger) Rift, the West Bohemian Shear Zone and the Mariánské Lázně Fault were probably predisposed by the boundaries of the mantle lithosphere domains. We have suggested that the sublithospheric mantle of the western BM acted as a major provider for heat and partial melts and the Variscan mantle boundaries served as magma conduits for the late-orogenic granitic magmatism and, after their rejuvenation, also for the Cenozoic volcanism. Similarly, the boundaries may have pre-determined the subsequent locations of sedimentary basins. It is possible that also in other regions some of these so called intra-plate phenomena can be related to partly healed up and later rejuvenated microplate boundaries.

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Seismic Anisotropy and Velocity Variations in the Mantle beneath the Saxothuringicum-Moldanubicum Contact in Central Europe

Cited by 46 publications

References 27 publications

Intraplate seismicity in the western Bohemian Massif (central Europe): A possible correlation with a paleoplate junction

Intraplate seismicity in the western Bohemian Massif (central Europe): A possible correlation with a paleoplate junction

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

Mantle lithosphere control of crustal tectonics and magmatism of the western Ohře (Eger) Rift

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