Strain localization due to structural in-homogeneities in the Central European Basin System |
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Authors: | Mauro Cacace Ulf Bayer Anna Maria Marotta |
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Institution: | (1) GeoForschungZentrum (GFZ) Potsdam, Sec. 4.3, Telegrafenberg, 14473 Potsdam, Germany;(2) Department of Earth Sciences, Sec. Geophysics, University of Milan, Milan, Italy |
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Abstract: | The large-scale crustal deformations observed in the Central European Basin System (CEBS) are the result of the interplay
between several controlling factors, among which lateral rheological heterogeneities play a key role. We present a finite-element
integral thin sheet model of stress and strain distribution within the CEBS. Unlike many previous models, this study is based
on thermo-mechanical data to quantify the impact of lateral contrasts on the tectonic deformation. Elasto-plastic material
behaviour is used for both the mantle and the crust, and the effects of the sedimentary fill are also investigated. The consistency
of model results is ensured through comparisons with observed data. The results resemble the present-day dynamics and kinematics
when: (1) a weak granite-like lower crust below the Elbe Fault System is modelled in contrast to a stronger lower crust in
the area extending north of the Elbe Line throughout the Baltic region; and (2) a transition domain in the upper mantle is
considered between the shallow mantle of the Variscan domain and the deep mantle beneath the East European Craton (EEC), extending
from the Elbe Line in the south till the Tornquist Zone. The strain localizations observed along these structural contrasts
strongly enhance the dominant role played by large structural domains in stiffening the propagation of tectonic deformation
and in controlling the basin formation and the evolution in the CEBS. |
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Keywords: | Central European Basin System Rheological heterogeneities Thin sheet approach Stress and strain localization |
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