European mantle lithosphere assembled from rigid microplates with inherited seismic anisotropy

Babuška, Vladislav; Plomerová, Jaroslava

doi:10.1016/j.pepi.2006.01.010

Cited by 95 publications

(78 citation statements)

References 64 publications

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“…The lack of a preferred fast direction may be caused by long-wavelength averaging of randomly oriented, azimuthally anisotropic domains in the continental lithosphere (Gaherty and Jordan, 1995). Alternatively, radial anisotropy may represent weak azimuthal anisotropy within an orthorhombic symmetry system (e.g., Babuška and Plomerová, 2006).…”

Section: Radial Anisotropymentioning

confidence: 99%

The elusive lithosphere–asthenosphere boundary (LAB) beneath cratons

Eaton

Darbyshire

Evans

et al. 2009

Lithos

388

288

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The lithosphere-asthenosphere boundary (LAB) is a first-order structural discontinuity that accommodates differential motion between tectonic plates and the underlying mantle. Although it is the most extensive type of plate boundary on the planet, its definitive detection, especially beneath cratons, is proving elusive. Different proxies are used to demarcate the LAB, depending on the nature of the measurement. Here we compare interpretations of the LAB beneath three The seismic LAB beneath cratons is typically regarded as the base of a high-velocity mantle lid, although some workers infer its location based on a distinct change in seismic anisotropy.Surface-wave inversion studies provide depth-constrained velocity models, but are relatively insensitive to the sharpness of the LAB. The S-receiver function method is a promising new seismic technique with complementary characteristics to surface-wave studies, since it is 2 sensitive to sharpness of the LAB but requires independent velocity information for accurate depth estimation. Magnetotelluric (MT) observations have, for many decades, imaged an "electrical asthenosphere" layer at depths beneath the continents consistent with seismic lowvelocity zones. This feature is most easily explained by the presence of a small amount of water in the asthenosphere, possibly inducing partial melt. Depth estimates based on various proxies considered here are similar, lending confidence that existing geophysical tools are effective for mapping the LAB beneath cratons.

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Section: Radial Anisotropymentioning

confidence: 99%

The elusive lithosphere–asthenosphere boundary (LAB) beneath cratons

Eaton

Darbyshire

Evans

et al. 2009

Lithos

388

288

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“…Alternative model is presented by Babuška and coworkers (e.g. Babuška et al 2010;Babuška and Plomerová 2006) who argue that no delamination took place during the development of the Variscan Orogen. This model would imply more mafic lower crust, consisting of mafic granulites.…”

Section: The Crustal Structure Beneath the Niedźwiedź Massifmentioning

confidence: 99%

“…The thickness of lithosphere exceeding 100 km beneath the Sudetic part of the Bohemian Massif was suggested by Babuška and Plomerová (2006) on the basis of seismic study. Babuška et al (2010) show the lithosphereasthenosphere boundary (LAB) to be located at ca.…”

Section: The Depth Of Asthenospherementioning

confidence: 99%

Lithosphere thermal structure at the eastern margin of the Bohemian Massif: a case petrological and geophysical study of the Niedźwiedź amphibolite massif (SW Poland)

Puziewicz

Czechowski

Krysiński

et al. 2011

Int J Earth Sci (Geol Rundsch)

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The crustal section beneath amphibolite Niedźwiedź Massif (Fore-Sudetic Block in NE Bohemian Massif), modelled on the basis of geological and seismic data, is dominated by gneisses with subordinate granites (upper and middle crust) and melagabbros (lower crust). The geotherm was calculated based on the chemical analyses of the heat-producing elements in the rocks forming the crust and the measurements of their density and heat conductivity. The results were verified by heat flow calculations based on temperature measurements from 1,600 m deep well in the Niedźwiedź Massif and by temperaturedepth estimates in mantle xenoliths coming from the nearby ca. 4.5 My basanite plug in Lutynia. The paleoclimate-corrected heat flow in the Niedźwiedź Massif is 69.5 mW m -2 , and the mantle heat flow is 28 mW m -2 . The mantle beneath the Massif was located marginally relative to the areas of intense Cenozoic thermal rejuvenation connected with alkaline volcanism. This results in geotherm which is representative for lithosphere parts located at the margins of zones of continental alkaline volcanism and at its waning stages. The lithosphereasthenosphere boundary (LAB) beneath Niedźwiedź is located between 90 and 100 km depth and supposedly the rheological change at LAB is not related to the appearance of melt.

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“…Thanks to systematic preferred orientation of olivine crystals and their elastic anisotropy, the mantle lithosphere exhibits a consistent large-scale seismic anisotropy of domains in dimensions of several hundred kilometres (Babuška and Plomerová 2006, for review) observed in directional variations of longitudinal-wave velocities and in shearwave splitting. Teleseismic shear-wave splitting, the analogy of the light birefringence, is generally considered as a proof of the upper mantle anisotropy, and represents the most common method to study the seismic anisotropy (see, e.g., Savage 1999, for review).…”

Section: Mapping Of Seismic Anisotropymentioning

confidence: 99%

“…The smooth and consistent pattern of seismic anisotropy can extend laterally up to several hundreds kilometres. Its change is often linked with prominent tectonic sutures or dominant faults cutting the whole lithosphere (Babuška and Plomerová 2006). Different P-sphere patterns on both sides of a suture often turns to "no P pattern" right above a suture, as the waves sample both differently oriented fabrics.…”

Section: Mapping Of Seismic Anisotropymentioning

confidence: 99%

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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European mantle lithosphere assembled from rigid microplates with inherited seismic anisotropy

Cited by 95 publications

References 64 publications

The elusive lithosphere–asthenosphere boundary (LAB) beneath cratons

The elusive lithosphere–asthenosphere boundary (LAB) beneath cratons

Lithosphere thermal structure at the eastern margin of the Bohemian Massif: a case petrological and geophysical study of the Niedźwiedź amphibolite massif (SW Poland)

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

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