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Intraplate brittle deformation and states of paleostress constrained by fault kinematics in the central German platform

Intraplate brittle deformation and states of paleostress constrained by fault kinematics in the central German platform
Intraplate brittle deformation and states of paleostress constrained by fault kinematics in the central German platform
The structural evolution of Central Europe reflects contrasting tectonic regimes after the Variscan orogeny during Mesozoic – Cenozoic time. The brittle deformation related to each tectonic regime is localized mainly along major fault zones, creating complex fracture patterns and kinematics through time with diverging interpretations on the number and succession of the causing events. By contrast, fracture patterns in less deformed domains often provide a pristine structural inventory. We investigate the brittle deformation of a relatively stable, wide area of the central German platform using fault-slip data to identify the regional stress fields required to satisfy the data. In a non-classical approach, and in order to avoid local stress variations and misinterpretations, the fault-slip data are scaled up throughout the study area into subsets of consistent kinematics and chronology for sedimentary cover and crystalline basement rocks. Direct stress tensor inversion was performed through an iterative refining process, and the computed stress tensors were verified using field-based observations. Criteria on relative tilt geometry and indicators of kinematic change suggest a succession of events, which begins with a post-Triassic normal faulting regime with ?3 axis trending NE-SW. The deformation then follows by strike-slip and thrust faulting regimes with a change of ?1 axis from N-S to NE-SW, supposedly in the Late Cretaceous. Two younger events are characterized by Cenozoic normal and oblique thrust faulting regimes with NW-SE-trending ?3 and ?1 axes, respectively. The fracture patterns of both the cover and basement rocks appear to record the same states of stress.
Brittle tectonics, Fault kinematics, Intraplate deformation, Paleostress
0040-1951
146-163
Navabpour, Payman
db0e3431-a671-40df-818c-efd19551fa0b
Malz, Alexander
bd9afdc5-674a-4071-8cd0-2e4fc44250f1
Kley, Jonas
aa0056e8-6521-4aa4-b8d5-65f90e30a7df
Siegburg, Melanie
b4801eca-cd00-401b-8cb0-a21da9754c42
Kasch, Norbert
1168e614-f66e-4147-b9ba-4badca902d11
Ustaszewski, Kamil
58bb3d77-ead2-4d71-b00e-ebb8e315f86c
Navabpour, Payman
db0e3431-a671-40df-818c-efd19551fa0b
Malz, Alexander
bd9afdc5-674a-4071-8cd0-2e4fc44250f1
Kley, Jonas
aa0056e8-6521-4aa4-b8d5-65f90e30a7df
Siegburg, Melanie
b4801eca-cd00-401b-8cb0-a21da9754c42
Kasch, Norbert
1168e614-f66e-4147-b9ba-4badca902d11
Ustaszewski, Kamil
58bb3d77-ead2-4d71-b00e-ebb8e315f86c

Navabpour, Payman, Malz, Alexander, Kley, Jonas, Siegburg, Melanie, Kasch, Norbert and Ustaszewski, Kamil (2017) Intraplate brittle deformation and states of paleostress constrained by fault kinematics in the central German platform. Tectonophysics, 694, 146-163. (doi:10.1016/j.tecto.2016.11.033).

Record type: Article

Abstract

The structural evolution of Central Europe reflects contrasting tectonic regimes after the Variscan orogeny during Mesozoic – Cenozoic time. The brittle deformation related to each tectonic regime is localized mainly along major fault zones, creating complex fracture patterns and kinematics through time with diverging interpretations on the number and succession of the causing events. By contrast, fracture patterns in less deformed domains often provide a pristine structural inventory. We investigate the brittle deformation of a relatively stable, wide area of the central German platform using fault-slip data to identify the regional stress fields required to satisfy the data. In a non-classical approach, and in order to avoid local stress variations and misinterpretations, the fault-slip data are scaled up throughout the study area into subsets of consistent kinematics and chronology for sedimentary cover and crystalline basement rocks. Direct stress tensor inversion was performed through an iterative refining process, and the computed stress tensors were verified using field-based observations. Criteria on relative tilt geometry and indicators of kinematic change suggest a succession of events, which begins with a post-Triassic normal faulting regime with ?3 axis trending NE-SW. The deformation then follows by strike-slip and thrust faulting regimes with a change of ?1 axis from N-S to NE-SW, supposedly in the Late Cretaceous. Two younger events are characterized by Cenozoic normal and oblique thrust faulting regimes with NW-SE-trending ?3 and ?1 axes, respectively. The fracture patterns of both the cover and basement rocks appear to record the same states of stress.

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More information

Accepted/In Press date: 21 November 2016
Published date: 2 January 2017
Keywords: Brittle tectonics, Fault kinematics, Intraplate deformation, Paleostress
Organisations: Geology & Geophysics

Identifiers

Local EPrints ID: 405777
URI: http://eprints.soton.ac.uk/id/eprint/405777
ISSN: 0040-1951
PURE UUID: 5a1e982d-cc77-4a77-8919-6a3464563125

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Date deposited: 10 Feb 2017 11:47
Last modified: 08 Jan 2022 06:41

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Contributors

Author: Payman Navabpour
Author: Alexander Malz
Author: Jonas Kley
Author: Melanie Siegburg
Author: Norbert Kasch
Author: Kamil Ustaszewski

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