Geološki anali Balkanskoga poluostrva

Browse Items (142 total)

  • GABP201125011R.pdf

    Milanković’s cycles theory published hundred years ago is the most important theory in climate science and had great influence on Earth disciplines. Nevertheless, his work waited for more than fifty years for confirmation. It could be said that Milanković’s work had most influence in creation of Astronomic Time Scale, supporting of continental drift hypothesis and palaeoclimatology implications. Positive results of the implementation of the astronomic time scale to the Neogene stratigraphy initiated the application of this method within the Mesozoic, and lately also to the Paleozoic sediments. Milanković’s manuscript of astronomical forcing of climate changes led to fruitful cooperation with Alfred Wegener who was searching for additional arguments to validate his continental drift hypothesis. The factors that cause climate changes enable insight to the geological past, but also the possibility to model the climate conditions which await us in the future. Climate change prediction allowed people, as only being aware of its influence, to act preventively and take all measurements needed to reduce greenhouse gasses emission.

    Radivojević Dejan,
  • 0350-06081172029R.pdf

    During the Late Cretaceous, marine organisms experienced significant changes in their biodiversity. These diversity changes were influenced, particularly, by the Oceanic Anoxic Event 2 near the Cenomanian/Turonian boundary (93.6 Ma). Here, stratigraphic ranges of 80 marine macroinvertebrate genera (cephalopods, brachiopods, gastropods, corals, and echinoids) were employed to assess the Late Cretaceous biodiversity dynamics in the Eastern Caucasus, which covered a large region located in the northern Neo-Tethys Ocean. Our results outline three prominent diversity minima, which occurred in the late Cenomanian-late Turonian, the early Santonian-late Campanian, and the late Maastrichtian. Probably, the latter two were just local. Despite of some differences in trends between the regional and global marine biodiversity dynamics, the late Cenomanian-late Turonian biotic crisis appeared both on the regional and global scales and was probably a long-term consequence of the Oceanic Anoxic Event 2. Oxygen depletion and eustaticallydriven shoreline shifts are considered as plausible causes of the observed biodiversity dynamics.

    Ruban Dmitry A., Forster Astrid, Desmares Delphine,
  • 0350-06081172021T.pdf

    In the Bulgarian and Serbian geological literatures, many maps, both geological and tectonic, exist showing the structures, but limiting them nationally. There are very few publications correlating the structures from both sides of the border and they preserve the local Bulgarian or Serbian names. Our aim is to create a base for the unification of the names defining the major morpho-tectonic structures: the Moesian Platform, the Miroč - Fore-Balkan Unit, the Poreč-Stara Planina Unit, the Krayna Unit, the Getic - Srednogorie Unit, the Supra Getic - Kraishtide Zone, the Serbo-Macedonian - Thracian Massif and the Vardar Zone, showing their synonyms from the Bulgarian and Serbian sides.

    Tchoumatchenco Platon, Rabrenović Dragoman, Radulović Vladan, Radulović Barbara, Malešević Nenad,
  • 0350-06081172001T.pdf

    Herein, correlations of the Jurassic sediments from NE Serbia with those of NW Bulgaria are made. The following Jurassic palaeogeographic units: the Eastern Getic, the Infra-Getic and the Moesian Platform are included in the study. The East Getic was studied in the outcrops near Rgotina, where the sedimentation started in the Hettangian and continued during the Callovian-Late Jurassic and is represented by platform carbonates. The Infra-Getic is documented by the sections of Dobra (Pesača) and the allochtonous sediments near the Štubik. Very important for the Infra-Getic are the Late Jurassic volcano-sedimentary deposits of the Vratarnica Series, which crop out near Vratarnica Village. The Jurassic Moesian platform was studied in the sections near D. Milanovac and Novo Korito (Serbia) and in their prolongation in NW Bulgaria into the Gornobelotintsi palaeograben. Very important are the correlation in the region of Vrška Čuka (Serbia) and Vrashka Chuka (Bulgaria) - Rabisha Village (Magura Cave). A revision of the Jurassic sediments on the Vidin palaeohorst, which were studied in the Belogradchik palaeohorst, Gorno-Belotintsi palaeograben, Belimel palaeohorst and the Mihaylovgrad palaeograben, is made. The sedimentation on the Vidin palaeohorst started during different parts of the Middle Jurassic, and in the Mihaylovgrad palaeograben during the Hettangian (Lower Jurassic) where the sediments were deposited in relatively deeper water conditions. To south, the relatively shallow water sediments deposited on the Jurassic Vratsa palaeohorst on the southern board of the Mihaylovgrad palaeograben are described.

    Tchoumatchenco Platon,Rabrenović Dragoman, Radulović Vladan,Malešević Nenad, Radulović Barbara,
  • 0350-06082000001V.pdf

    The somehow ignored northern portion of the Banat-Timok Province/Banatitic Belt is reconsidered in metallogenetic terms after updated evaluation based on recent considerations and long ago recognized tectonic, magmatic and metallogenetic evidence. Banatitic occurrences in the investigated area are confined to the NE extent of the non productive alkali-calcic alignment up to the Mures Valley where it joins the sub-latitudinal Bega-Mures branching lineament. Banatitic edifices related to this junction depart from the alkali-calcic trend, drifting to the productive calc-alkaline porphyry environment, characteristic of Timok-South Banat metallogeny. The assemblage of Cretaceous volcanics/pyroclastics and sedimentary formation with subvolcanic and blind intrusions with associated alteration and mineralization creates a environment that reminds the well-known Timok setting. Despite the so far poor understood setting with underestimated economic attractivity, integrated geological-geophysical evidence underscore the potential of this peculiar Timok like volcano-plutonic structure associated with blind porphyry Cu-Au and distal base metal expression, fostering future investigations.

    Vlad Şerban Nicolae,
  • 0350-06081802029A.pdf

    Global population is growing rapidly. As a result, increasingly large areas are being settled and farmed. This devastates soils and causes pollution by heavy metals and other components. Heavy metals in the environment originate from both natural and anthropogenic sources. Natural sources generally include rock weathering and the propagation of heavy metals, such as Cr and Ni, from ultrabasic rocks. These are natural processes that generally do not threaten human health. Anthropogenic sources include industry and inappropriate disposal of waste in the environment. In such cases concentrations of heavy metals can be harmful to people and other living beings. Al Zintan is a city located in northwestern Libya, on a plateau mainly built up of Cretaceous sediments. Since the 1980’s, nomadic population has rapidly been settling this area. As a result, a former part of the desert was transformed and is used for farming. Soil sampling at Al Zintan was conducted in 2017, across a 2×2 km grid. A total of 143 samples were collected from depths of about 30 cm. The samples weighed 2 to 2.5 kg and generally comprised sand with a clay component. A Niton Xl3t goldd+ instrument was used for chemical analyses, based on which GIS heavy-metal distribution maps were generated. The distribution of Cr, Ni, Cu and Zn is discussed on the paper.

    Alzarog Taher Mohamed,Vakanjac Boris,Jelić Ivana,Ristić Vakanjac Vesna,Naunović Zorana,Gajić Vuk,Đorđević-Milošević Suzana,
  • 0350-06082100007A.pdf

    The problem of correlating Lake Pannon sediments across its basin has been the occupation of many geologists. At first, it was hampered by the prevalence of biostratigraphic, rather than lithostratigraphic correlation. The task became accomplishable when, thanks to seismic survey data, the strongly progradational character of Lake Pannon sedimentation had been understood. Thus, this paper aims to describe the formations from all parts of Lake Pannon and compare them to the ones described in Serbia. Material used includes published and unpublished data from all countries with Pannonian Basin System upper Miocene and lower Pliocene deposits, in the form of seismic, borehole and outcrop data. Even though the system is strongly asymmetric, both spatially and temporally, the formation synthesis framework should help better understanding among geologists operating within the basin. For the first time the informal formations are proposed for all Lake Pannon sediments in Serbia. The formations are linked to a progradational deltaic system within the following succession: basinal plain–turbidite–slope–delta front–delta plain–lacustrine and alluvial environments. The lithostratigraphic correlation has a huge potential in the context of industry. The main potential surely lies in petroleum geology, but it could be also very useful for exploration of geothermal energy, hydrogeology and construction materials.

    Anđelković Filip,Radivojević Dejan,
  • 1. Anđelković M. & Anđelković J..pdf

    U radu se daje stratigrafski razvoj čučalske serije i rašičke serije, njihove litostratigrafske karakteristike a na osnovu nalazaka otolita izvršena je stratigrafska odredba. Nalayak sisarske faune u povlati ugljenog sloja u s.Čučale, kao i nalazak otolita u čučalskim crvenim klastitima određuju egersku starost čučalske serije. Ovo prilikom po prvi put je izdvojena rašička serija koja je do sada uvršćivana u povlatni odeljak čučalske serije. Na osnovu asocijacije otolita izvršeno je i stratigrafsko izdvajanje čučalske i rašičke serije a na osnovu vertikalnog rasprostranjenja pojedinih vrsta otolita utvrđeno je da je rašička serija stvarana u egerburg-otnangu. Nadalje se ukazuje na značaj izvršenih stratigrafskih raščlanjivanja za dalja stratigrafska proučavanja slatkovodnih basena na osnovu asocijacije otolita.

    Anđelković Milodrag,Anđelković Jelena,
  • 3. Anđelković M..pdf
  • 5. Anđelković M. & Mitrović - Petrović J..pdf
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