Cretaceous transformation from passive to active continental margin in the Western Carpathians as indicated by the sedimentary record in the Infratatric unit |
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| Authors: | Marián Puti? Hans-Jürgen Gawlick Wolfgang Frisch Marián Sulák |
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| Institution: | (1) Faculty of Natural Sciences, Department of Mineralogy and Petrology, Comenius University of Bratislava, Mlynska dolina, 842 15 Bratislava 4, Slovakia;(2) Department of Applied Geology and Geophysics, University of Leoben, Peter Tunner Strasse 5, 8700 Leoben, Austria;(3) Department of Geosciences, University of Tübingen, Sigwartstrasse 10, 72076 Tübingen, Germany |
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| Abstract: | The Cretaceous orogen of the Western Carpathians comprises fragments of the destructed northern Centrocarpathian domain, which
is defined as Infratatric unit and formed a continental margin facing the Penninic Ocean in Jurassic and Cretaceous times.
The breakup event and opening of the Penninic Ocean occurred in the Early Jurassic (Pliensbachian), which is recorded by an
abrupt deepening event from shallow-water sediments to deep-water nodular limestone in the Infratatric sediment succession.
The transformation of the passive into an active continental margin by the onset of subduction of the Penninic oceanic crust
occurred in Santonian times and is reflected by the beginning of flysch deposition in the Infratatric Belice domain, which
took the position of a forearc basin in the convergent margin setting. The forearc basin was supplied by clastic material
from the more internal part of the Infratatric unit, which experienced nappe stacking, metamorphism, and subsequent exhumation
in Late Cretaceous times. In the frontal part of the forearc basin an accretionary wedge was built up, which formed an outer-arc
ridge and delivered detrital material into the forearc basin in Maastrichtian time. Final collision between the European and
the Adriatic plate occurred in the Eocene period and is responsible for weak metamorphism in the Infratatric unit. |
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| Keywords: | Passive /active continental margin Western Carpathians Infratatric unit Penninic Ocean Jurassic– Cretaceous |
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