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| Titel |
Structure and tectonic evolution of the Vøring Margin |
| VerfasserIn |
Dmitry Zastrozhnov, Jan Inge Faleide, Sonja Theissen-Krah, Mohamed Mansour Abdelmalak, Sverre Planke |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250100513
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| Publikation (Nr.) |
 EGU/EGU2014-16487.pdf |
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| Zusammenfassung |
| The Vøring Margin off mid-Norway formed in response to early Cenozoic continental
breakup and subsequent opening of the Norwegian-Greenland Sea. The present-day structure
of the Vøring Basin, covering a wide part of the margin, is a result of a series of
post-Caledonian episodes of extension culminating with a complete continental separation in
early Cenozoic time. It can be divided into a series of sub-basins, highs, grabens, domes and
ridges, mainly reflecting differential vertical movements during the Late Jurassic–Early
Cretaceous and Cenozoic extensional basin evolution. Mid-Cenozoic compressional
deformation (including domes/anticlines, reverse faults and broad-scale inversion) is well
documented on the Vøring margin, but its timing and role are debated. The main phase of
deformation is obviously aged to Miocene, but some of the structures are believed to be
initiated earlier in Late Eocene–Oligocene. Despite the number of studies on the
Vøring Basin, some problems continue to hinder a satisfactory understanding of its
evolution. Structural development of the Vøring Basin has very complex history,
and thus many researchers have developed structural maps of the area. However,
there is a significant gap between the last updated structural maps and ongoing
studies, thus needs an updated structural analysis of the area. Another problem is the
seismic interpretation of pre-Cretaceous sediments into the deepest parts of the
Vøring Basin. The increasing of rates of accommodation and thickness of Late
Mesozoic- Cenozoic rocks to westward direction as well as wide distribution of
intrusive and effusive bodies lead to decreasing of imaging quality of underlying
pre-Cretaceous sediments and its wrong interpretation. Generally, results from recent wells
provide more precise age constraints on the Cretaceous succession in the western
Vøring Basin. The new seismic data provides more rigorous imaging of the deep
pre-Cretaceous basin configuration. These results have been integrated to update existing
and construct new regional 2D transects for tectonic modeling. The regional 2D
transects and refined time-structure and time-thickness maps are used to illustrate the
structure and evolution of the margin with particular focus on the deep Vøring
Basin. We compared the observed geometry of crustal thinning in the frame of
tectonic modeling conducted to quantify the pre-drift extension across the margin. |
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