Faculty of Mining, Geology and Petroleum Engineering Repository
Not a member yet
2190 research outputs found
Sort by
Online course: Rare Earth Elements value chain gaps and opportunities in the ADRIA region
No full textThe workshop "Rare Earth Elements value chain gaps and opportunities in the ADRIA region" is organized as part of the EIT project RECO2MAG - Novel grain boundaries engineered resource efficient Nd-Fe-B permanent magnets (financed by EIT KIC Raw Material)
Reconstruction of Late Miocene and Early Pliocene diachronous infill of Mura and Drava Depression
No full textThe Upper Miocene to Pliocene sediments, referred to as Pannonian Stage in the Central Paratethyan regional chronostratigraphic terminology, were initially deposited in an underfilled lake basin displaying gradual a lake level rise. It was followed by a powerful lake level fall characterized by prograding and aggrading clinothems visible on seismic data sourced from the surrounding mountain chains and filling the basin system mainly from the NW and NE. Detailed studies and analyses of the Pannonian sedimentary architecture were published mostly from the eastern part of the basin system, such as the Makó and Derecske troughs and the Békés basin, whereas from the western basins only interpretations of loosely spaced 2D seismic sections or small individual 3D volumes are available, all mainly restricted within the political boundaries of Hungary. Despite various related research in the southwestern part of the Pannonian Basin System (PBS), the overall geometry of the Lake Pannon progradational infill remained insufficiently known. The Mura and Drava basins, located in the SW part of the PBS in NE Croatia and SW Hungary, once took up a large portion of Lake Pannon and now hold several km thicknesses of Pannonian sediments. Long-standing hydrocarbon exploration activity in the southwestern PBS resulted in the immense availability of reflection 2D and 3D seismic data. Over hundreds of 2D lines and over twenty 3D seismic cubes across the 20 000 km2 area were interpreted to create framework of clinoform system infill. Detailed seismic stratigraphic interpretation of the prograding clinoform complex enabled attribute analysis of 3D seismic data to fully investigate depositional processes and lithofacies associations, and sediment fairways. In order to reconstruct gradual progradation and to visualize paleogeographic evolution of the area in time and space, rollover trajectories of selected clinothems were mapped. The upper and lower subaqueous rollover boundaries of the slope (PELLEGRINI et al., 2020) were marked throughout the study area by flattening the seismic sections onto shallower alluvial and delta plain surfaces which approximate palaeo-horizontals. Throughout the area 15 regional clinothem surfaces were mapped (Pa-1 to Pa-15). Seismic-stratigraphy principles used resulted in clinothem framework representing short time intervals from 105 – 106 Ma deposited in various depositional environments. Clinothems reflect interaction of sediment supply and accommodation space controlled by thermal subsidence and climate-change. Based on stratigraphic data linked with seismic, the rate of progradation and slope advance was calculated, and closing of Lake Pannon over time was visualized. Clinothems were mapped for the first time over the large Drava basin spatially defining closing of Lake Pannon during the Late Miocene and the Early Pliocene. Although often aggravated by lack or poor quality of the data, such framework considerably improved reconstruction of paleogeographic evolution and sediment fairways
Curves in lightlike planes in three-dimensional Lorentz–Minkowski space
No full textIn this paper, we analyze the intrinsic geometry of lightlike planes in the three-dimensional Lorentz–Minkowski space M3. We connect the theory of curves lying in lightlike planes in M3 with the theory of curves in the simply isotropic plane I2. Based on these relations, we characterize some special classes of curves that lie in lightlike planes in M3
On the evolution of Middle Triassic passive margins of the Greater Adria Plate : inferences from the study of calc-alkaline and shoshonitic tuffs from NW Croatia
No full textRhyolitic tuffs are readily found within the Northwestern Croatian Triassic Rift Basin which akems the southernmost segment of the geotectonic unit of the Southern Alps. The latter, located in the SW segment of the Zagorje-Mid-Transdanubian shear Zone, provides insights into the volcanism and geody - namic history of the passive margins of the Greater Adria Plate during the Middle Triassic. The eruptions at the time produced material that was distributed through air-fall transport and pyroclastic density currents, and after deposition gave rise to acidic pyroclastic rocks of the Pietra Verde type. These rocks are homogeneous to horizontally laminated, showing intervals of normal gradation and appear as vitroclastic, vitrocrystalloclastic, and crystalloclastic tuffs. Late Anisian-early Ladinian sub-alkaline, middle to high-K calc-alkaline, and shoshonitic tuffs feature a LREE over HREE enrichment, high LILE content, and HFSE depletion. Negative anomalies of the Nb-Ta pair, P, Sr, Eu, and Ti coupled with variable positive and negative spikes of Pb and Ba, respectively were also documented. An important contribution of the continental material in the evolution of the studied acidic rocks is attested by negative values of initial ε Nd (-2.7 to -4.95). Tuff petrogenesis essentially included melting of the heterogeneous lithospheric (subcontinental) mantle, subordinated melting of the conti - nental crust and fractional crystallization of feldspar. Studied tuffs originated in a continental margin volcanic arc(?) environment formed during an active(?) northward subduction of the Paleotethyan lithosphere beneath the Eurasian Plate or, alternatively, more likely, during the passive continental rifting along the margins of the Greater Adria Plate
Correlations between hotel size and gas consumption with a feasibility analysis of a fuel switch—a coastal case study Croatia Adriatic
No full textThis paper analyses gas consumption in hotels on the Adriatic coast, comparing data on natural gas and liquefied petroleum gas (LPG) consumption by hotel size. The research hypothesis is that by switching from LPG to natural gas, not only can a reduction in emissions be achieved in the hospitality industry, but there are also significant economic benefits. The research objectives included a regression analysis for various factors affecting gas consumption. The analysis showed a medium–strong relationship between the variables, which is a novelty for energy trends in the hospitality sector. By converting from heating oil to natural gas, hotels can achieve significant financial savings. It was also calculated that this would reduce the total energy consumption costs. Measures taken by the hospitality industry will have a positive impact on guest perception and could be used as a promotional tool under the “green hospitality” label
Seizmostratigrafska interpretacija mezozojskog slijeda naslaga između Palagruže i Mljeta s osvrtom na naftnogeološki potencijal
No full textWe investigated Mesozoic carbonate succession in the offshore area of Southern Adriatic, between Palagruža and Mljet island. The aim of the study was to investigate distribution of Mesozoic successions which can be attributed to the Adriatic Carbonate Platform (ACP) and deep-water Adriatic Basin (AB) (VLAHOVIĆ et al., 2005; which is very thick (in places more than 8000 m FANTONI & FRANCIOSI, 2010). A further goal was to define seismic facies distribution of these two paleogeographic units and use them for the analysis of possible play and prospect evaluation in that area. The research was done on the basis of 2D seismic, logging data of six wells and published data. Different seismic facies were defined based on the amplitudes, frequencies, and paleogeographic position. They were correlated with facies defined in the geological reports of the wells. Well to seismic tie was conducted identifying the main stratigraphic horizons on seismic and by synthetic seismogram on available wells. Seismic interpretation defined the spatial distribution of chronostratigraphic boundaries and the most significant unconformities e.g., Messinian unconformity, Top Mesozoic unconformity, and Mid-Triassic unconformity. Parts of the carbonate platform and deep-water basin, as well as salt diapirs and their influence on the underground structures, are clearly visible on the seismic of the area. Facies analysis determined the geological development of the area through the Mesozoic and the spatial distribution of sedimentary environments. Possible plays are attributed to the slope sediments of Adriatic Carbonate Platform of Mesozoic succession and Paleocene– Miocene sandstones. The Adriatic Carbonate Platform slope play is presented by coarse grained debris sediments. The Paleocene–Miocene sandstone play is presented by calcareous clastic sediments of “f lysh” unit which are prone to occurrence within the salt diapir traps. Within the carbonate complex, the position and distribution of the Jurassic rocks of Emma formation (MAZZUCA et al., 2015) are defined as they represent the source rocks for both plays. The seal rocks of the possible plays are Paleocene–Miocene and Pliocene–Holocene classic finegrained deposits. Findings here present the geological evidence for further basin evaluation and play and prospect investigation in the Southern Adriatic define identified plays together with petroleum system element
Comparison of different radiological risk assessment scenarios at a coal ash and slag disposal site
No full textCoal fly ash and slag waste residuals from coal combustion are an issue of importance as one of the possible sources of environmental contamination and exposure to NORM. This study compares the results of different radiological risk assessment scenarios targeting terrestrial biota at a legacy site in Croatia that contains large quantities of coal ash with an enhanced content of radionuclides originating from previous industrial activities. The ERICA assessment tool was used for a risk assessment, which included data from borehole samples with a maximum depth of 6 m and trees as the primary reference organisms. The results of the risk assessments from various depth ranges found the radiological risk to the reference organisms to be negligible, regardless of the depth range, since the screening dose rate of 10 µGyh−1 was not exceeded in any of the assessments. The risk assessment results from all depth ranges show higher total dose rate predictions when the tool’s default CR values are used, compared to the site-specific ones, which is in agreement with previous studies on the application of the ERICA tool. A comparison of results from different spatial radiological risk assessments showed that sample depth does not affect the estimated total dose rate to biota
Progress in landslide research and technology, volume 2, issue 1, 2023
No full textThe Open Access book series of the International Consortium on Landslides (ICL) aims to be the common platform for the publication of recent progress in landslide research and technology for practical applications and the benefit of society contributing to the Kyoto Landslide Commitment 2020, which is expected to continue up to 2030 and even beyond for the global promotion of understanding and reducing landslide disaster risk as well as the 2030 Agenda Sustainable Development Goals. The contributions include original and review articles, case studies, activity reports and teaching tools for the promotion of understanding and reducing landslide disaster risks
Multidisciplinary approach to conceptual modelling of hydrothermal systems
No full textPanonski dio Hrvatske ima povoljne geotermalne karakteristike, a prirodni izvori termalne vode temperatura do 65 °C pojavljuju se na dvadesetak lokacija. Te vode se koriste tisućljećima, a u proteklih pedeset godina predstavljaju ključni resurs turističkih i lječilišnih centara. Povećanje potražnje za termalnom vodom s vremenom je potaknulo crpljenje većih količina. Međutim, termalna izvorišta su dio hidrotermalnih sustava koji uključuju: područja prihranjivanja u planinskim zaleđima izvora; geotermalne vodonosnike (uglavnom mezozojske karbonatne stijene) u kojima se voda zadržava i zagrijava zbog toplinskog toka iz Zemljine unutrašnjosti; i područja istjecanja na mjestima povoljnih struktura veće propusnosti. Kontinuirano funkcioniranje takvih sustava zavisi od osjetljive ravnoteže između brzine toka podzemne vode, procesa taloženja / otapanja i tektonskih pokreta. Kako bi se ta ravnoteža očuvala i termalna izvorišta koristila na održiv način, potrebno je razumijevanje na razini sustava te su istraživanja predložena s tim ciljem. Rezultati multidisciplinarnih istraživanja (strukturno- geološka, hidrogeološka, geotermijska, hidrogeokemijska, geofizička i daljinska istraživanja) koriste se za izradu konceptualnih modela hidrotermalnih sustava, 3D geološku rekonstrukciju, hidrogeološku i termalnu parametrizaciju jedinica i provedbu numeričkih simulacija funkcioniranja sustava u neporemećenim uvjetima i s različitim scenarijima crpljenja. Metodologija se testira na tri pokusna područja u Hrvatskoj gdje se koristi termalna voda. Istraživanja se provode u sklopu petogodišnjeg uspostavnog istraživačkog projekta HyTheC. Tijekom dosadašnjih triju godina provedbe formirana je istraživačka grupa, nabavljeni su potrebna oprema i usluge te su provedena sva predviđena terenska istraživanja u trima pokusnim područjima (slika 1). Raspored pojedinih metoda istraživanja prema dijelovima hidrotermalnih sustava prikazan je na slici 2. Do sada su izrađeni 3D geološki modeli dvaju hidrotermalnih sustava (Daruvara i Topuskog), dok je jedan i parametriziran (Daruvar) te su u tijeku numeričke simulacije funkcioniranja sustava korištenjem komercijalnih programskih paketima i programa otvorenog koda. Kvalitetni konceptualni i numerički modeli koji će biti izrađeni u sklopu projekta omogućit će ocrtavanje i zaštitu područja prihranjivanja i određivanje održivih crpnih količina, što je preduvjet za dugoročno održivo korištenje hidrotermalnih sustava, a trenutno nije adekvatno regulirano u hrvatskom zakonodavnom okviru.Povećano korištenje termalne vode predviđeno je mnogim europskim i hrvatskim strateškim dokumentima iz područja energetike, turizama i zaštite okoliša. Stoga HGICGS uspostavlja multidisciplinarnu grupu za istraživanje hidrotermalnih sustava koja će doprinijeti odgovornom razvoju geotermalnih lokaliteta u našoj državi, te biti znanstveno produktivna i konkurentna u prijavama na natječaje različitih mehanizama financiranja