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Evolution of paleostress fields and brittle deformation of the Tornquist Zone in Scania (Sweden) during Permo-Mesozoic and Cenozoic times

Bergerat, Francoise; Angelier, Jacques and Andréasson, Per-Gunnar LU (2007) In Tectonophysics 444. p.93-110
Abstract
The NW-SE oriented Sorgenfrei–Tornquist Zone (STZ) has been thoroughly studied during the last 25 years, especially by means of well data and seismic profiles. We present the results of a first brittle tectonic analysis based on about 850 dykes, veins and minor fault-slip data measured in the field in Scania, including paleostress reconstruction. We discuss the relationships between

normal and strike-slip faulting in Scania since the Permian extension to the Late Cretaceous–Tertiary structural inversions. Our paleostress determinations reveal six successive or coeval main stress states in the evolution of Scania since the Permian. Two stress states correspond to normal faulting with NE-SW and NW-SE extensions, one stress state is... (More)
The NW-SE oriented Sorgenfrei–Tornquist Zone (STZ) has been thoroughly studied during the last 25 years, especially by means of well data and seismic profiles. We present the results of a first brittle tectonic analysis based on about 850 dykes, veins and minor fault-slip data measured in the field in Scania, including paleostress reconstruction. We discuss the relationships between

normal and strike-slip faulting in Scania since the Permian extension to the Late Cretaceous–Tertiary structural inversions. Our paleostress determinations reveal six successive or coeval main stress states in the evolution of Scania since the Permian. Two stress states correspond to normal faulting with NE-SW and NW-SE extensions, one stress state is mainly of reverse type with NESW compression, and three stress states are strike-slip in type with NNW-SSE, WNW-ESE and NNE-SSW directions ofcompression.

The NE-SW extension partly corresponds to the Late Carboniferous–Permian important extensional period, dated by dykes and fault mineralisations. However extension existed along a similar direction during the Mesozoic. It has been locally observed until within the Danian. A perpendicular NW-SE extension reveals the occurrence of stress permutations. The NNW-SSE strike-slip episode is also expected to belong to the Late Carboniferous–Permian episode and is interpreted in terms of right-lateral wrench faulting along STZ-oriented faults. The inversion process has been characterised by reverse and strike-slip faulting related to the NE-SW compressional stress state.

This study highlights the importance of extensional tectonics in northwest Europe since the end of the Palaeozoic until the end of the Cretaceous. The importance and role of wrench faulting in the tectonic evolution of the Sorgenfrei–Tornquist Zone are

discussed. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Scania, Basin formation, Tornquist Zone, Brittle deformation, Paleostress field, Inversion
in
Tectonophysics
volume
444
pages
93 - 110
publisher
Elsevier
external identifiers
  • wos:000250793200006
  • scopus:35148812567
ISSN
0040-1951
DOI
10.1016/j.tecto.2007.08.005
language
English
LU publication?
yes
id
985ef04d-2e64-4d73-8f64-0219a9394d1a (old id 596809)
date added to LUP
2008-01-23 15:03:23
date last changed
2017-10-01 04:41:06
@article{985ef04d-2e64-4d73-8f64-0219a9394d1a,
  abstract     = {The NW-SE oriented Sorgenfrei–Tornquist Zone (STZ) has been thoroughly studied during the last 25 years, especially by means of well data and seismic profiles. We present the results of a first brittle tectonic analysis based on about 850 dykes, veins and minor fault-slip data measured in the field in Scania, including paleostress reconstruction. We discuss the relationships between<br/><br>
normal and strike-slip faulting in Scania since the Permian extension to the Late Cretaceous–Tertiary structural inversions. Our paleostress determinations reveal six successive or coeval main stress states in the evolution of Scania since the Permian. Two stress states correspond to normal faulting with NE-SW and NW-SE extensions, one stress state is mainly of reverse type with NESW compression, and three stress states are strike-slip in type with NNW-SSE, WNW-ESE and NNE-SSW directions ofcompression.<br/><br>
The NE-SW extension partly corresponds to the Late Carboniferous–Permian important extensional period, dated by dykes and fault mineralisations. However extension existed along a similar direction during the Mesozoic. It has been locally observed until within the Danian. A perpendicular NW-SE extension reveals the occurrence of stress permutations. The NNW-SSE strike-slip episode is also expected to belong to the Late Carboniferous–Permian episode and is interpreted in terms of right-lateral wrench faulting along STZ-oriented faults. The inversion process has been characterised by reverse and strike-slip faulting related to the NE-SW compressional stress state.<br/><br>
This study highlights the importance of extensional tectonics in northwest Europe since the end of the Palaeozoic until the end of the Cretaceous. The importance and role of wrench faulting in the tectonic evolution of the Sorgenfrei–Tornquist Zone are<br/><br>
discussed.},
  author       = {Bergerat, Francoise and Angelier, Jacques and Andréasson, Per-Gunnar},
  issn         = {0040-1951},
  keyword      = {Scania,Basin formation,Tornquist Zone,Brittle deformation,Paleostress field,Inversion},
  language     = {eng},
  pages        = {93--110},
  publisher    = {Elsevier},
  series       = {Tectonophysics},
  title        = {Evolution of paleostress fields and brittle deformation of the Tornquist Zone in Scania (Sweden) during Permo-Mesozoic and Cenozoic times},
  url          = {http://dx.doi.org/10.1016/j.tecto.2007.08.005},
  volume       = {444},
  year         = {2007},
}