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S.B. Nielsen

The post-Triassic evolution of the Sorgenfrei-Tornquist Zone - Results from thermo-mechanical modelling

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  • Department of Earth Sciences

The Sorgenfrei-Tornquist Zone (STZ) is part of the Fennoscandian Border Zone separating the Danish Basin from the Fennoscandian Shied. The STZ as a structural element is of Palaeozoic origin and represents the north-westerly segment of the Tornquist-Teisseyre Zone, which separates the younger West European crust from the older East European Platform and extends from the Black Sea to the eastern North Sea area The STZ was reactivated in Triassic-Jurassic extension and Late Cretaceous and Paleogene compression. This paper investigates the regional geological consequences of the reactivations by quantitative modeling along a profile across the STZ in the Danish area. The numerical model invokes elastic, viscous and plastic deformations of the lithosphere as well as surface processes governed by erosion, sedimentation and lateral transport under the influence of eustatic sea level variations and regional isostatic compensation. Surface processes and lithospheric mechanics are coupled through thermal blanketing effects and loading. The results, in general, address the regional geological consequences of the existence of intracontinental zones of structural weakness. More specifically the results show that the Late Cretaceous and Paleogene chalk depocentres in the Danish Basin are a direct consequence of the inversion of the STZ, and that the STZ inversion together with falling sea level in Cenozoic time are amongst the principal controlling factors in the geological evolution in the eastern North Sea area

Original languageEnglish
JournalTectonophysics
Volume328
Issue3-4
Pages (from-to)245-267
Number of pages23
ISSN0040-1951
DOIs
Publication statusPublished - 1 Jan 2000

    Research areas

  • Eustacy, Finite-elements, Heat flow, Scandinavia, Structural inversion, Surface processes, Tectonics, Thermo-mechanical modelling, Visco-elastic-plastic

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