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| Titel |
Does intraplate brittle deformation indicate far-field stress signals? A
case study of Central Europe |
| VerfasserIn |
Payman Navabpour, Jonas Kley, Eline Le Breton, Douwe J. J. van Hinsbergen, Kamil Ustaszewski |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250140741
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| Publikation (Nr.) |
 EGU/EGU2017-4170.pdf |
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| Zusammenfassung |
| Even though Central Europe has been located within a plate interior since the end of the
Variscan orogeny, its intracontinental basins and highs recorded a succession of different
tectonic regimes throughout the Mesozoic and Cenozoic, which were coeval with events
at distant plate margins. A long Triassic–Cretaceous period of weak subsidence
with intermittent extension was followed by NNE-SSW contraction in the Late
Cretaceous–Paleocene. Renewed extension led to the formation of the Cenozoic Rift System
and eventually evolved to the present-day variable stress regimes with a consistent
NW-SE-oriented maximum horizontal shortening, SHmax. The detailed knowledge of this
evolution relies on exhaustive lithostratigraphy and geochronological datasets, as well as on
reconstruction of successive states of paleostress that controlled the formation and/or
inversion of intracontinental basins. In combination, these data provide an excellent
opportunity of linking the intracontinental deformation to the lithospheric plate boundary
kinematics.
Regional-scale analysis of fault kinematics in Central Europe unveiled a succession of
consistent stress states for the crystalline basement and sedimentary cover of the brittle crust.
These states of stress include a post-Triassic normal faulting regime with NE-SW-trending σ3
axis, strike-slip and thrust faulting regimes with NNE-SSW-trending σ1 axis, supposedly of
Late Cretaceous age, and two younger events of normal and strike-slip faulting regimes with
NW-SE-trending σ3 and σ1 axes, respectively. In this study, we report on the first attempts of
linking the central European intraplate kinematics to changes in relative motion between the
plates. The integration of stress fields with plate boundary kinematics suggests that
the Late Cretaceous contraction may be explained by a change in African plate
motion with respect to Eurasia from SE-directed sinistral transform to NNE-directed
convergence. The reorientation of contraction to the present-day SHmax likely
results from a change in direction of Africa–Eurasia plate convergence from N-S to
NW-SE combined with plume-enhanced ridge push of the North Atlantic Ocean. |
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