Late Cretaceous and Cenozoic dynamics of the Bohemian Massif inferred from the paleostress history of the Lusatian Fault Belt

0443496 - GLÚ 2016 RIV GB eng J - Journal Article
Coubal, Miroslav - Málek, Jiří - Adamovič, Jiří - Štěpančíková, Petra
Late Cretaceous and Cenozoic dynamics of the Bohemian Massif inferred from the paleostress history of the Lusatian Fault Belt.
Journal of Geodynamics. Roč. 87, July 1 (2015), s. 26-49. ISSN 0264-3707
R&D Projects: GA ČR GAP210/12/0573
Institutional support: RVO:67985831 ; RVO:67985891
Keywords : paleostress * fault kinematics * Lusatian Fault Belt * Elbe fault system * Bohemian Massif * Alpine foreland
Subject RIV: DB - Geology ; Mineralogy
Impact factor: 1.926, year: 2015

An analysis of fault-slip data from the Lusatian Fault Belt, limiting the Lusatian Block of the Bohemian Massif in the SW, yielded parameters of eight successive paleostress patterns, Late Cretaceous to Plio-Pleistocene in age. These patterns were linked with specific stages in fault kinematics and fault-belt deformation. They include (1) α₁, NE- to NNE-directed compression in a reverse fault regime (σ₃ vertical) associated with major thrusting and drag zone formation in the latest Cretaceous, preceded by pre-drag origin of deformation bands α₀; (2) αβ_1-2, WNW-directed extension associated with emplacement of polzenite-group volcanics (ca 80-61Ma) and influx of hydrothermal fluids, overlapping in time with α₁; (3) α₂, N-directed compression in a reverse fault regime, probably Paleocene in age, associated with thrusting and intensive shear faulting in adjacent parts of blocks; (4) αβ₃, Early Oligocene W- to WNW-directed extension in a regime of strike-slip faulting (σ₂ vertical), probably connected with an emplacement of phonolitic magmas and influx of hydrothermal fluids; (5) α₃, NNW-directed compression associated with activation of transverse/oblique faults of the fault belt, close in age to αβ₃ with unclear mutual superposition; (6) β, Late Oligocene-Early Miocene multi-stage N- to NE-directed extension in a normal fault regime, specific to the Bohemian Massif, responsible for downfaulting of the hangingwall block; (7) γ, Mid to Late Miocene NE-directed compression in a reverse fault regime associated with thrusting; (8) δ, Pliocene (to Pleistocene?) NW- to NNW-directed compression in a strike-slip regime, associated with transverse faulting in the fault belt. The identified paleostress patterns show a good correlation with the hitherto identified paleostress fields transmitted to the Alpine foreland and refine the temporal sequence of paleostress states, especially in the post-Lower Miocene period.
Permanent Link: http://hdl.handle.net/11104/0246203