Dørene åbner kl 18:30 og foredraget begynder kl 19:00, forfriskninger vil være tilgængelige i Cafeen. Aftenens foredrag avholdes på Engelsk (med mindre alle er Norsk talende - så blir det på Dansk/Norsk.)
Kveldens foredragsholder er: Alexander Lassen; Neoproterozoic and Palaeozoic evolution of SW Scandinavia based on integrated seismic interpretation
What is the nature of the transition from the Precambrian shield areas in Norway and Sweden to the Phanerozoic sedimentary basins in NW Europe ?
Traditionally the geological evolution in NW Europe has mainly been viewed in the context of Phanerozoic orogenic events; the Caledonian, Variscan and Alpine orogenies. However looking at the main tectonic structures in the Danish area it can be seen that they do not line-up with any of the Phanerozoic orogenic events. In order to investigate whether the peculiar fan-shaped main structures of the Danish area may be influenced by orogenic events involving the older Baltica crust an extensive integrated geophysical/geological mapping covering the entire Danish area and parts of S. Sweden, S. Norway and N. Germay has been undertaken. The main objective was to map the (near) top of the crystalline basement and assess the extent and thickness of lower Palaeozoic sedimentary basins below Denmark. Also deep (long offset refraction/reflection) seismic data was used to map the thickness of the entire crust (Moho depth). Gravimetric and magnetic data was also integrated into the mapping. Detailed structural analysis of the data indicate that the Neoproterozoic break-up of the supercontinent Rodinia may have been instrumental in the formation of the fundamental shape of the sedimentary basins in the Danish area. The subsequent Phanerozoic orogenic events extensively modified the basins and some former Neoproterozoic rifts may have been reactivated and inverted such as e.g. the Sorgenfrei Tornquist Zone (STZ). The actual southern Baltica margin is also situated further South than previously thought – not below the Danish – German border but below the S part of the N. German Basin.
Reference: Lassen, A. & Thybo, H., 2012, Neoproterozoic and Palaeozoic evolution of SW Scandinavia based on integrated seismic interpretation. Precambrian Research vol. 204-205, p. 75-104.
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