Facies analyses, biostratigraphy and radiometric dating of the Lower-Middle Miocene succession near Zajecar (Dacian basin, eastern Serbia) (original) (raw)

Age and evolution of the Serbian Lake System: integrated results from Middle Miocene Lake Popovac

Newsletters on Stratigraphy, 2016

With 12 figures and 2 tables Abstract. During the Early to Middle Miocene, a complex interplay of climate variability, sea level change, and Alpine tectonics resulted in the development of a series of long-lived lakes in the Dinarides and Serbian regions. While recent dating studies improved understanding of the Dinaride Lake System (DLS) evolution, independent age constraints are still lacking for the Serbian Lake System (SLS). Here, we present the results of an integrated study combining biostratigraphy, magnetostratigraphy, and 40 Ar/ 39 Ar radioisotopic dating of the sedimentary succession of ancient Lake Popovac to improve the chronostratigraphic framework and paleoenvironmental understanding of the SLS. Our biostratigraphic analyses of the mollusks and ostracods show endemic marker taxa for the Middle Miocene bioprovince of the SLS, such as Prososthenia fuchsi PAVLOVIĆ, ?Mediocypris sp., and ?Dinarocythere sp. Magnetostratigraphy revealed only one normal polarity interval, with a single reversed sample on top and, combined with an 40 Ar/ 39 Ar weighted mean crystallization age of 14.40 Ȁ 0.01 Ma, we correlate the studied Lake Popovac succession to Chron C5ADn, with a maximum extent from 14.61-14.16 Ma. Cyclostratigraphic analysis based on magnetic susceptibility and natural gamma radiation field logs suggest insolation forcing of the succession with an upward decrease in sedimentation rate from 25 to 12 cm/kyr. While the majority of the DLS originated during the Miocene Climatic Optimum (MCO) at ~17 Ma and disappeared before ~15 Ma, the development of the SLS started around 14.5 Ma in the Langhian. Regionally overlying Serravallian marine sediments of the Central Paratethys imply that the Serbian Lake cycle must have ended before 13.8 Ma. Initiation of SLS deposition in the study area coincided with a peak of syn-rift extension in the Pannonian back-arc basin, which apparently also affected the Peri-Pannonian realm as far south as the study area in the Morava depression.

Middle miocene badenian transgression: New evidences from the Vrdnik coal basin (Fruska Gora Mt., Northern Serbia)

Geoloski anali Balkanskoga poluostrva, 2013

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 mentione...

SYNRIFT AND POSTRIFT MIOCENE SEDIMENTS OF NORTHERN BANAT, SERBIA

A large number of high-quality data obtained during many years of oil and gas exploration on the territory of Vojvodina has enabled the creation of a subsurface model of northern Banat. Special emphasis is placed on the Miocene sediments which are the most important part of sedimentary cover due to its geological and economic potential. The rifting phase varies through time and space across the Serbian part of Pannonian Basin. The Lower Miocene, Badenian and Sarmatian sediments belong to synrift in broader sense, while Pannonian and Pontian sediments are assigned as postrift sediments. The depositional environment determination of postrift sediments were enabled with use of lithostratigraphy method. Apstrakt: Veliki broj kvalitetnih podatka dobijenih višegodišnjim istraživanjima nafte i gasa na prostoru Vojvodine omogućio je izradu potpovršinskog modela severnog Banata. Poseban akcenat je stavljen na miocenske sedimente koji predstavljaju najznačajniji deo sedimentnog pokrivača zbog svog geološkog i ekonomskog potencijala. Riftogeneza u srpskom delu Panonskog basena se menja u vremenu i prostoru. Donjomiocenski, badenski i sarmatski sedimenti pripadaju sinriftogenetskoj fazi u širem smislu, dok fazi postriftogeneze pripadaju panonski i pontski sedimenti. Primenom litostratigrafske metode bilo je moguće izdvojiti depozicione sredine u okviru postriftnih sedimenata.

Magneto-biostratigraphy and paleoenvironments of the Miocene freshwater sediments of the Sarajevo-Zenica Basin

Palaeogeography, Palaeoclimatology, Palaeoecology, 2018

The Sarajevo-Zenica Basin of Bosnia-Herzegovina was part of the Dinaride Lake System, a large network of Miocene long-lived freshwater basins in southeastern Europe. The basin contains a thick sedimentary succession of carbonates, coals and mixed siliciclastic deposits that reflects the paleoclimatic and tectonic evolution of the region. In this study, we present novel integrated (magneto-bio)stratigraphic and sedimentological data and reconstruct the paleoenvironmental evolution of the Sarajevo-Zenica Basin during its two main evolutionary phases (thrusting and extension). The basal "Oligo-Miocene" freshwater paleoenvironments are characterized by alternating palustrine, shallow lacustrine and distal fluvial phases. The base level fluctuations are largely controlled by syn-sedimentary pulses of tectonic loading during the final phase of thrusting in the Internal Dinarides. The majority of this succession is considered early Miocene in age, which contrasts with previous Oligocene age estimates. The subsequent extensional phase initiated not later than ~18.4 Ma. This coarsening upward sequence of lacustrine carbonates, silts, sands and conglomerates is correlated between 17.2 and 15 Ma (C5Cr-C5Br) by means of integrated bio-magnetostratigraphy. During this upper extensional phase, subsidence and sediment influx was generally controlled by activity along the basin bounding normal fault, overruling smaller scale climatic influences. We conclude that the existence of the long-lived Sarajevo lake is coeval with other Dinaric and southern Pannonian lakes, and overlaps in time with the Miocene Climatic Optimum. Sedimentation in the Sarajevo-Zenica basin terminated at ~15-14 Ma which concurs with both the end of the climatic optimum as well as the cessation of extension in the Dinarides. These results will help to better quantify the paleoclimatic changes in the Dinaride Lake System as well as the regional tectono-sedimentary events, such as potential migrations of deformation across the Dinarides.

Stratigraphy revision of upper Badenian of Rakovica stream near Belgrade (Central Paratethys, Serbia)

Annales g?ologiques de la Peninsule balkanique

Belgrade area is a region of high paleobiodiversity, being ranked among the best known in Serbia. The prominent position among a number of Middle Miocene (Badenian) fossiliferous sites in the vicinity of Belgrade (southern Pannonian Basin, Central Paratethys) are occupied with sediments of Rakovica stream, also known as ?Rakovica sands?. Here, the integrated evidence based on new fossil findings of calcareous nannoplankton, foraminifera and molluscs assemblages, allows the stratigraphic revision of the clastic facies of the Rakovica succession. Based on the studies of lithological composition, high paleodiversity molluscs fauna and local palaeogeographical setting, it can be concluded with reasonable certainty that deposits of Rakovica stream entitled ?Rakovica sand? represents a sandstone of the shallow marine (littoral) environment during Lower Badenian time. Large benthic foraminifera Ammonia viennensis (d?ORBigny), and Borelis haueri (d?ORBigny) as well as zone marker nn5 Sphaen...

Chronology and integrated stratigraphy of the Miocene Sinj Basin (Dinaride Lake System, Croatia

Palaeogeography Palaeoclimatology Palaeoecology, 2010

In the Miocene, the intra-montane basins of the Dinaric Mountain Chain harbored a series of long-lived lakes constituting the so-called Dinaride Lake System. The thick lacustrine sedimentary records of these lakes provide an excellent opportunity to study evolution and radiation of mollusks in an isolated environment. The 500 m thick infill that accumulated in the Sinj Basin is one of the key records because of its excellent mollusk preservation. Recent studies on the depositional history, pollen assemblages and large mammals have enhanced the understanding not only of Lake Sinj, but also of the regional climatic developments and faunal migratory patterns. A reliable chronology of the development of Lake Sinj, which is crucial for global correlation of its endemic realm, was still lacking. In this paper we present a detailed time-frame for the Miocene Sinj basin based on palaeomagnetic and 40 Ar/ 39 Ar data. We conclude that deposition took place between 18.0 to 15.0 Ma, a time span that correlates with the upper Burdigalian and lower Langhian Mediterranean stages and Ottnangian, Karpatian and lowermost Badenian Paratethys stages. Furthermore, we determined the timing of several events in mollusk evolution, important for correlation across the Dinarides. An age of 15.0 Ma is attributed to the large mammals Conohyus and Gomphotherium, preserved in the upper part of the basin stratigraphy.

Stratigraphy and Palaeogeography of Miocene Deposits from the Marginal Area of Žumberak Mt. and the Samoborsko Gorje Mts. (Northwestern Croatia)

Geologia Croatica, 2005

Miocene sediments rimming the Palaeozoic-Mesozoic-Palaeogene rocks, form Žumberak Mt. and the Samoborsko Gorje Mts. Spatial analysis of the setting and development of the surface Miocene stratigraphy, at the marginal areas of the Žumberak and Samoborsko Gorje Mts., allows four palaeogeographic areas to be distinguished: Žumberak, Plešivica-Sveta Jana, Samobor-Sveta Nedelja and Grdanjci. In the Miocene deposits (totaling 350 m), within the area of Žumberak, coarse-grained clastics from deltaic deposits of Pannonian age prevail. Here only, 50 m of sediments of Pliocene-Pleistocene age overlie the Miocene deposits whereas Mesozoic carbonates represent the basement. The Plešivica-Sveta Jana area is characterized by a 600 m sequence of Miocene deposits, mainly overlying Triassic dolomites, where finely-grained layers of marls and silts prevail. In this area, Miocene successions from the Badenian to the Pontian are characterized by a continuity of sedimentation with an inherited depositional environment. In the area of Samobor-Sveta Nedelja, the basement is diverse: Triassic dolomites, volcanogenic-sedimentary complex of Cretaceous age and a clastic-carbonate complex of Palaeogene age. The Miocene succession shows a regressive trend from the Badenian to the Pontian and the total thickness is estimated at 400 m. The area of Grdanjci differs considerably from the other Miocene palaeorelief. An approximately 50 m-thick series of coarsegrained clastics with coal is distinguished, of unclear stratigraphic age (Ottnangian?). Miocene sediments of the Grdanjci area are represented by both a transgressive type of conglomerates and shallow water limestones of Badenian age, with a total thickness of about 100 m.

The stratigraphy of the Serbian Pleistocene Corbicula beds

Quaternary International, 2015

Fossils of non-marine molluscs are among the most prominent in continental Pleistocene deposits of Europe. With stabilization of taxonomies in the 19th century, numerous publications appeared with faunal lists of warm/temperate stage taxa, but few attempts were made to interpret the data. The goal of recent work, along with the re-evaluation of sites and their molluscan assemblages described in the literature, is to enable non-marine molluscan faunas to be used as guide fossils for the analysed fluvial sequences in the classification of climato-lithostratigraphic principles. The biostratigraphic scheme developed in this work is comparable with parallel investigations of other fossil records and climatolithostratigraphy combined with geochronologic methods. In earlier literature, the Pleistocene Corbicula record was mentioned in Maki s beds ("Maki ski slojevi"), in the Corbicula fluminalis beds ("slojevi sa C. fluminalis") of Szentes deposits ("Sente ski slojevi"), as well as being associated with the Viviparus boeckhi Horizon as defined by Halav ats in the late 19th century.

AGE AND MODE OF THE MIDDLE MIOCENE MARINE FLOODING OF THE PANNONIAN BASIN-CONSTRAINTS FROM CENTRAL SERBIA

PALAIOS, 2019

The timing and mode of the marine flooding of the southern margin of the Pannonian basin in SE Europe is still a matter of debate. In central Serbia, integrated bio-magnetostratigraphic data and quantified high-resolution records are completely missing. Here, we provide paleoenvironmental and paleoecological constraints from the Slanci section located near Belgrade that has an excellent preservation of micro-fauna and flora, i.e., planktonic and benthic foraminifera and calcareous nannoplankton. We integrate their quantified records with sedimentological, natural gamma radioactivity and magnetic susceptibility logs and include the non-quantified records of mollusks, corals, and ostracods to reconstruct the regional depositional history. The section shows upper bathyal to outer shelf depositional settings and alternating nutrient bottom conditions. The shallowing upwards trend marked by increasing terrestrial input, attributes it to the early Highstand Systems Tract of the first marine third order sequence in this part of the Pannonian Basin. We infer that the marine flooding in central Serbia took place at an age of~14 Ma, slightly predating the Langhian/Serravallian boundary (13.82 Ma) and the Badenian Salinity Crisis (~13.8-13.4 Ma) in the Central Paratethys. Our results support an eastwards directed, tectonically forced, flooding of the southern Pannonian Basin. This major paleoenvironmental turnover was forced by syn-rift tectonics in the Pannonian Basin system, which started in the late early Miocene in the Styrian Basin (SE Austria) and ended more than 3 Myr later in the late middle Miocene in the Morava depression (E Serbia).