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

Early Sarmatian paleoenvironments in the easternmost Pannonian Basin (Borod Depression, Romania) revealed by the micropaleontological data

Pages: 67 - 81

Authors: SORIN FILIPESCU, ANGELA MICLEA, MARTIN GROSS, MATHIAS HARZHAUSER, KAMIL ZÁGORŠEK, CĂTĂLIN JIPA

Abstract: The Sarmatian sedimentary record of the Borod Depression (eastern Pannonian Basin) consists of a marine sequence with continental influence. The investigated section, located near Vârciorog, was biostratigraphically and paleoenvironmentally analysed. The micro- and macrofossil assemblages include dasycladaceans, characeans, foramin- ifera, molluscs, polychaetes, ostracods, crabs, bryozoans, fish and vertebrate remains, which are characteristic for a shallow marine setting with local transitions to continental facies. The microfossil assemblages are characteristic for the Elphidium reginum Zone and Mohrensternia Zone of the early Sarmatian (Serravallian). The succession of popula- tions correlates with the sedimentological trend, allowing the separation of several genetic units. The relative sea-level changes and the progradational trend from the top of the section suggest active tectonics in the hinterland (Apuseni Mountains). The shallow seas surrounding the emerging islands (Apuseni Mountains) provided the connections be- tween the Pannonian and Transylvanian basins during the early Sarmatian.

Keywords: Sarmatian (late Middle Miocene), Borod Depression (NW-Romania), paleoenvironments, paleogeography, sequence stratigraphy, molluscs, bryozoans, foraminifera, ostracods

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