Geological Survey of Montenegro

Podgorica, Montenegro

Geological Survey of Montenegro

Podgorica, Montenegro
Time filter
Source Type

Radusinovic S.,Geological Survey of Montenegro | Jelenkovic R.,University of Belgrade | Pacevski A.,University of Belgrade | Simic V.,University of Belgrade | And 3 more authors.
Ore Geology Reviews | Year: 2017

Three vertical sections through the Zagrad deposit of Jurassic karst bauxite in central Montenegro have provided knowledge of the vertical distribution of major and some selected trace elements, including rare earth elements (REE). Variations in the mineralogy, particularly those hosting REE, have been studied. This has revealed the presence of authigenic mineral phases such as xenotime, mottramite and monazite (best proved using Raman microprobe analysis) as well as residual phases such as zircon, titanite and monazite. The mobility of the elements during bauxitization processes has been studied to show that the REE minerals ensure progressive concentration of these elements during removal of major elements through weathering. The similarity of normalized REE in the bauxite to the typical Post-Archean Australian Shales (PAAS) and Upper Continental Crust (UCC) profile, and the preserved Eu anomaly, are evidence that the bauxite was not derived from carbonates and represents alteration of shale, marly limestone and volcanogenic or proximal igneous sourced detritus that accumulated in the original karst landform. Mass change during bauxitization, using Ti as “index” element and compared to PAAS composition, revealed almost 100% depletion of Si and weak enrichment in Al. Deeper parts of the deposit with authigenic minerals exhibit very strong enrichment in all REE. The bauxite ores have high ΣREE contents (693.5–6953.4 ppm), especially ΣLREE contents (582.8–4882.9 ppm), while ΣHREE contents (106.6–2070.5 ppm) are much lower. © 2016 Elsevier B.V.

Radulovic D.,Serbian Institute for Technology of Nuclear and Other Mineral Raw Materials | Bozovic D.,Geological Survey of Montenegro | Terzic A.,Serbian Institute for Testing of Materials IMS | Trumic M.S.,University of Belgrade | And 2 more authors.
Journal of Ceramic Science and Technology | Year: 2017

Because of its physico-mechanical and physico-chemical characteristics, fine-ground (i.e. micronized) limestone is widely applied in the production of new materials. Limestone can be used as a filler, coating and/or powder in ceramic composites. The effect of its fine micronization depends on the type of equipment used and on the disintegration process. In this study, the emphasis was placed on investigation of the kinetics of the dry micronization milling of limestone in a state-of-the-art ultra-centrifugal mill with a peripheral comminuting path. The efficiency of the ultracentrifugal mill with a peripheral comminuting path was determined based on a detailed investigation of the limestone dry micronization, which satisfied all the requirements for technological parameters as well as for micronized product parameters. On the basis of the investigation of these parameters and theory of dry micronization conducted in a state-of-the-art mill with use of advanced instrumental techniques for determination and observation of the most significant physical and chemical characteristics, a kinetics model was developed to serve as the basis for quick and effective determination of micronization quality and efficiency. In this paper, the results of grinding in a Retsch ZM-1 ultra-centrifugal mill were analyzed in order to optimize and automate the process of ultrafine micronization. © 2017 Göller Verlag.

Radulovic M.,University of Montenegro | Stevanovic Z.,University of Belgrade | Sekulic G.,University of Montenegro | Radulovic V.,Geological Survey of Montenegro | And 6 more authors.
Environmental Earth Sciences | Year: 2015

The Skadar Lake basin is located in the south-eastern part of the classical Dinaric karst region (northern Mediterranean). This region is well known for its highly developed karst and the presence of all types of karstic features. In addition to the high degree of karstification, the advantage of Skadar Lake’s catchment area in terms of water resources is also reflected in the following factors: a large amount of precipitation, scarcity of soil and vegetation cover, favourable geological and geomorphological conditions for karst aquifer discharge, the isolation of the Skadar basin from the influence of the Adriatic Sea and an availability of water for simple abstraction. For the purposes of a more complete determination of the water balance of Skadar Lake, among other undertakings, it has been necessary to determine the groundwater inflow to the lake through numerous sublacustrine springs (vruljas). By using thermal infrared satellite and terrestrial imaging, the locations of the largest sublacustrine springs have been detected and their yield assessed by means of water balance calculation after the application of the KARSTLOP method. The mean annual groundwater inflow to the lake, from the south-western edge only, is 9.86 m3/s. The total outflow of water from the lake through the Bojana River is around 304 m3/s. The coincidence of several important natural factors leads to the large average specific yield (surface and subsurface) in the Skadar Lake catchment area (54 l/s/km2), which makes this region one of the richest areas of freshwater in the world. © 2015, Springer-Verlag Berlin Heidelberg.

Antovic N.M.,University of Montenegro | Svrkota N.,Center for Ecotoxicological Research | Antovic I.,State University of Novi Pazar | Svrkota R.,Geological Survey of Montenegro | Jancic D.,Center for Ecotoxicological Research
Isotopes in Environmental and Health Studies | Year: 2013

Activity concentrations of the naturally occurring radionuclides 226Ra, 232Th, 40K and anthropogenic 137Cs in sand samples collected from 20 renowned beaches on the Coast of Montenegro have been determined using an HPGe (high purity Ge spectrometer). The average activity concentrations were found to be 7.4, 5.2, 97.3 and 0.5 Bq kg-1, respectively. For all sand samples, the radium equivalent activity has been evaluated and found to be lower than the limit of 370 Bq kg-1. External and internal hazard indices were less than unity. The gonadal dose equivalent was estimated to be on average 75 μSv y-1, which is about four times lower than the global average for soil (0.3 mSv y-1). Calculated values of absorbed dose rates showed the range from 3.1 to 28 nGy h-1, which is below the world median of average values (57 nGy h-1). The effective dose rate in the range from 3.8 to 34.4 μSv y-1 was significantly below the recommended limit value for the public (1 mSv y-1). The highest dose rate was found for the Velika Plaza locality, which also showed heavy metal contents (As, B, Cd, Hg, Cr, Cu, Mn, Ni, Pb, Zn and Ba) significantly higher than in the sand from Jaz, a locality with one of the lowest dose rates. © 2013 Copyright Taylor and Francis Group, LLC.

Antovic N.M.,University of Montenegro | Svrkota N.,Center for Ecotoxicological Research | Antovic I.,State University of Novi Pazar | Svrkota R.,Geological Survey of Montenegro | And 2 more authors.
Journal of Radioanalytical and Nuclear Chemistry | Year: 2014

Among all diagnosed and treated lung cancers in Montenegro in 2009, 15.5 % were from Nikšić. The incidence rate was estimated to be around 42.5 per hundred thousand. In order to understand the role of radioactivity in initiating lung cancer the data on indoor radon concentrations obtained from earlier work coupled with that obtained in the present work for 226Ra, 232Th/228Ac, 40K and 137Cs from uncultivated soils, were used to estimate hazard indices. The risk factor for lung cancer due to radon was found to be significantly higher than excess lifetime cancer risk due to terrestrial radiation—outdoor. The stem of blackberry (Rubus fruticosus) was also analyzed for its radioactivity content, and showed soil–plant transfer factors for radium and caesium—from typical ranges for soil–plant transfer factors given in the UNSCEAR 2008 report. © Akadémiai Kiadó, Budapest, Hungary 2014.

Loading Geological Survey of Montenegro collaborators
Loading Geological Survey of Montenegro collaborators