Geoloski anali Balkanskoga poluostrva 2013 Issue 74, Pages: 9-23
https://doi.org/10.2298/GABP1374009R
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Middle miocene badenian transgression: New evidences from the Vrdnik coal basin (Fruška Gora Mt., Northern Serbia)
Rundić Ljupko (Faculty of Mining and Geology, Department of Historical and Dynamic Geology, Belgrade)
Knežević Slobodan (Faculty of Mining and Geology, Department of Historical and Dynamic Geology, Belgrade)
Rakijaš Milovan (Hidro-Geo Rad, Belgrade)
The latest field investigation of the Vrdnik Coal Basin as well as new data
from numerous boreholes enabled the finding of an unconformity between the
undivided continental-lacustrine Lower Miocene and the marine Middle Miocene
Badenian. The different terrestrial-lacustrine sediments indicate a very
mobile and dynamic environment (according to known drilling data, the total
thickness of these deposits reaches up to 300 m). All these rocks belong to
the Vrdnik series (Vrdnik Formation). The evolution of the Vrdnik series is
distinguished by several stages (e.g. pre-lacustrine, lacustrine, peat-swamp,
etc.). Each of these phases was proved by their sedimentologic and structural
characteristics. On the other hand, among the fossils, only the swamp flora
remains (Sequoia, Laurus, Taxodium, Glyptostrobus, etc.) and poor and
fragmented ostracode valves (Candona sp.) were documented. Presently, the
exact stratigraphic position of the Vrdnik series is unknown. Discordantly
over the mentioned rocks, real marine sediments of the Paratethys Sea occur.
To date, it was a completely unknown subsurface distribution of these
sediments. Among a few types of rocks that have a small distribution, the
so-called the Leitha limestones (Middle Miocene, Badenian) have great
significance (up to 98% of CaCO3). The total thickness of the limestones
reaches up to 70 meters (borehole B-11). The findings of key foraminifer
species (Orbulina - Globigerinoides Zone) indicate an early Badenian
(Moravian) transgressive event (ca. 15 Ma). Lithologically, it is represented
by gray, sandy marls and sandy clays, coarse-grained sands and
microconglomerates in the base of the mentioned limestones (boreholes B-11,
B-15, B-19, and B-21) with a total thickness of up to 15 meters.
Keywords: Middle Miocene Badenian, marine transgression, Vrdnik Coal Basin, northern Serbia
Projekat
Ministarstva nauke Republike Srbije, br. 176015