Kornpihl, Kristijan: Tectono-sedimentary Evolution of the NE German Variscan Foreland Basin. - Bonn, 2005. - Dissertation, Rheinische Friedrich-Wilhelms-Universität Bonn.
Online-Ausgabe in bonndoc: https://nbn-resolving.org/urn:nbn:de:hbz:5N-05321
urn: https://nbn-resolving.org/urn:nbn:de:hbz:5N-05321,
author = {{Kristijan Kornpihl}},
title = {Tectono-sedimentary Evolution of the NE German Variscan Foreland Basin},
school = {Rheinische Friedrich-Wilhelms-Universität Bonn},
year = 2005,
note = {The present study focuses on the tectono-sedimentary evolution of the NE German Variscan foreland basin that is genetically part of the Mid-European Variscides. Within these Mid-European Variscides, the situation considering Carboniferous-age strata is considerably complicated because the Carboniferous is buried under the thick young Permian and Mesozoic/Cenozoic-age sequences of the NE German Basin that contains sediments and volcanics of up to 7000 m thickness. The study is based on a network of 34 boreholes that were drilled into Carboniferous strata in the course of oil and gas exploration. The sedimentary Carboniferous succession of seventeen wells was documented and sampled in detail for this study. In addition, further seventeen wells were investigated in part; information from the literature and unpublished well reports was also incorporated. These wells provide the database for a facies analysis that examines the evolution of the depositional environments in time and space. The evolution of the depositional environments facilitated the spatial reconstruction of the evolving foreland basin which resulted in the compilation of a tectono-sedimentary model. This reconstruction (i.e. the tectono-sedimentary model) is presented in a series of nine cartoons which correspond to nine time-slices that demonstrate the evolution of the basin from Viséan (Asbian) to Stephanian times.
The oldest sediments (Asbian) that were cored in the basin's foredeep area are characterised by a deep-marine depositional environment with typical deposits of gravity flows, i.e. turbidites. Subsequent, progressive shallowing is recorded from the foredeep area which included the burying of the Viséan carbonate platform remains during the Namurian A. The deep-marine sedimentation in the foredeep area ceased at the beginning of the Namurian C. Subsequently, the foredeep area was uplifted and eroded from Westphalian B times onward while the foreland sedimentation continued in the area further to the north.
The passive continental northern margin of the Rheno-Hercynian Basin was occupied by the Tournaisian/Viséan "Kohlenkalk"-carbonate platform that preceded the initiation of foreland basin sedimentation. The initial effects of Variscan shortening were noted in the northern basin area during the Asbian when the carbonate platform collapsed, leading to the deposition of a clastic series in an intraplatform basin in the Rügen area. This break-up included the change from the autochthonous carbonate platform sedimentation to a siliciclastic shelf depositional environment. The northern shelf is characterised by a progressive shallowing from shallow-marine over coastal- to alluvial depositional environments. Moreover, a continuous northward shift of the basin axis and a progressive narrowing of the basin from Westphalian times onward were deduced from the tectono-sedimentary reconstruction.
Cessation of Variscan shortening was noted during the Westphalian D. This period is characterised by a progressive shallowing of the basin and an overall coarsening of the sediments. The Stephanian evolution of the area introduced the "Post-Variscan" period. This included the change from a peripheral foreland basin to an intracontinental basin, i.e. the NE German Basin. Therefore, the NE German Variscan foreland basin is regarded as the precursor of the NE German Basin. The tectono-sedimentary reconstruction of the basin could not identify any area that could be interpreted as an area of forebulge uplift. It is presumed that the studied basin did not develop a forebulge due to the considerable age and tectonic history of the underlying Avalonian lithosphere.},

url = {http://hdl.handle.net/20.500.11811/2274}

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