International Geological Journal - Official Journal of the Carpathian-Balkan Geological Association

Micropaleontological response to the changing paleoenvironment across the Sarmatian-Pannonian boundary in the Transylvanian Basin (Miocene, Oarba de Mures section, Romania)

Pages: 91 - 102

Authors: SORIN FILIPESCU, FRANZ WANEK, ANGELA MICLEA, ARJAN DE LEEUW, IULIANA VASILIEV

Abstract: The Sarmatian-Pannonian transition has been investigated in Section A of Oarba de Mures in the central Transylvanian Basin. Micropaleontological assemblages are diagnostic for different environmental settings and demonstrate a clear zonation, which was used to reconstruct the genetic units. Five stratigraphic sequences were described and subdivided based on the microfossil assemblages. Transgressive intervals were documented by five-chambered and biserial planktonic foraminifera, normal regressions by assemblages with abundant mysid, dasyclads, diatoms, and benthic rotaliid foraminifera, while the forced regressions are characterized by reworking. The Sarmatian-Pannonian boundary (11.3 Ma) is clearly documented by microfossils and is calibrated with radiometric and magnetostratigraphic data. A new interpretation for the interbasinal correlation is proposed by synchronizing the top of the Central Paratethyan Sarmatian with the top of the Eastern Paratethyan Bessarabian.

Keywords: Sarmatian, Pannonian, Transylvanian Basin, stratigraphy, microfossils, Foraminifera, Ostracoda

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Volume 62 no. 1 / February 2011

Volume 62 no. 1