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takPalaeomagnetic Results from the Sarmatian/Pannonian Boundaryin North-Eastern Croatia (Vranović Section, Našice Quarry)

Vasiliev, Iuliana ; Palaeomagnetic Laboratory ‘Fort Hoofddijk’, Utrecht University, Budapestlaan 17, NL-3584 CD Utrecht, The Netherlands ; vasiliev@geo.uu.nl ; Bakrač, Koraljka ; Croatian Geological Survey ; kbakrac@hgi-cgs.hr ; Kovačić, Marijan ; Department of Geology, Faculty of Science, University of Zagreb, Horvatovac bb, HR-10000 Zagreb, Croatia ; Abdul Aziz, Hayfaa ; Krijgsman, Wout

Croatian Geological Survey 2007

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takPalaeomagnetic Results from the Sarmatian/Pannonian Boundaryin North-Eastern Croatia (Vranović Section, Našice Quarry)
Autor: Vasiliev, Iuliana ; Palaeomagnetic Laboratory ‘Fort Hoofddijk’, Utrecht University, Budapestlaan 17, NL-3584 CD Utrecht, The Netherlands ; vasiliev@geo.uu.nl ; Bakrač, Koraljka ; Croatian Geological Survey ; kbakrac@hgi-cgs.hr ; Kovačić, Marijan ; Department of Geology, Faculty of Science, University of Zagreb, Horvatovac bb, HR-10000 Zagreb, Croatia ; Abdul Aziz, Hayfaa ; Krijgsman, Wout
Assuntos: Central Paratethys ; Croatia ; Palaeomagnetism ; Palynology ; Pannonian ; Sarmatian
Notas: http://hrcak.srce.hr/file/34611
http://hrcak.srce.hr/22013
Descrição: The Sarmatian/Pannonian boundary in the Central Paratethys basin is marked by a major regressive event, which isolated the basin from the open sea and resulted in a palaeoenvironmental change from restricted marine to brackish water ecosystems. The exact age of this environmental change is still ambiguous since direct age control on the boundary interval is lacking, mainly due to the scarcity of suitablesections. The Vranović section in the Našice Quarry in Croatia, however, is relatively long and continuously exposed. A detailed sedimentologicaland biostratigraphic study indicates that it contains the Sarmatian/Pannonian boundary and that it reflects the same palaeoenvironmentaltrend as other Paratethyan sequences. Here, we present palaeomagnetic and rock magnetic results from the Vranović section, based on 183 sampled levels distributed along 55 m of cyclically bedded limestones and marls. Rock magnetic data indicate the presence of maghemite or haematite in the Sarmatian deposits and low contents of magnetite in the Pannonian rocks. Thermal demagnetization results indicate dominantly normal polarities, and the mean direction closely coincides with the present-day field direction at Našice. We conclude that magnetostratigraphic age control cannot be derived for the Vranović section because of a dominant secondary (post-tilt) magnetization. Consequently, a firm numerical age based on magnetostratigraphy cannot be assigned to Sarmatian/Pannonian boundary events from this section.
Editor: Croatian Geological Survey
Data de criação/publicação: 2007
Idioma: Inglês

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takPalaeomagnetic Results from the Sarmatian/Pannonian Boundaryin North-Eastern Croatia (Vranović Section, Našice Quarry)

Croatian Geological Survey 2007

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