Adrian Biroň

• Slovak Academy of Sciences

A find of native tin in deeply weathered material at the Neogene epithermal Au-Ag deposit Pukanec in Slovakia raises the question of transport and reduction to native metal, especially when such a metal requires very strongly reducing conditions. The deeply weathered material contain powdery Mn oxides and clays, with the heavy fraction made of ceru...

With the exception of a fly and a mite from the Triassic of Italy, all Mesozoic amber arthropods are from the Cretaceous. Late Jurassic Lebanese amber from Aintourine revealed a completely preserved adult coccid male (wing length 0.8 mm), Jankotejacoccus libanogloria gen. et sp. n., the earliest record of a plant sucking scale insect. Associated pl...

The Rudno nad Hronom-Brehy ore deposit in Slovakia represents an important locality of epithermal precious metal mineralization in the Central Slovak Volcanic Field. The main ore structures in the area are Anna, Goldschram, Filip, Johan de Deo and Priečna veins. In this work, we present mineralogical, paragenetic and geochemical aspects of the ore...

In this work, we studied the assemblages of supergene minerals of the hydrothermal REE-U quartz vein mineralization at the Prakovce, Zimná Voda site. Chemically heterogeneous uranyl arsenates and minor phosphates of the autunite group (nováčekite, kahlerite, threadgoldite, autunite, arsenuranospathite and chistyakovaite) together with scorodite a...

The Domica-Baradla Cave System (Slovak Karst and Aggtelek Karst, a part of the UNESCO World Heritage list), which is situated on the Slovak-Hungarian border, has a total length of over 30 km and is a phenomenon of Slovak prehistory. Current systematic scientific research of the Domica Cave and its vicinity started at the end of 2017 and gained a se...

Perlites in the Central Slovakia Volcanic Field are associated with with rhyolite dykes, cryptodomes, extrusive domes, coulées and volcanoclastic rocks of the Jastrabá Fm. (12.3–11.4 Ma). From numerous occurrences only the Lehôtka pod Brehmi (LPB) and Jastrabá (JST) represent deposits of economic interest. The LPB deposit exploits a pile of extrude...

Early Paleogene events of the Alpine Tethys were considerably upgraded for the Western Carpathians. The Kršteňany KRS-3 core section provides high-resolution data from the Cretaceous-Paleogene (K/Pg) transition to Lutetian/Bartonian boundary. The Upper Cretaceous sequence started from terrestrial red-beds superposed by transgressive sediments with...

The Tatra moraine relief and cosmogenic nuclide dating show glacier stabilization and the maximum glacier extent in two phases, at 26-21 ka and at 18 ka followed by a gradual retreat and a termination of the glaciation during the Bølling/Allerød warming at 14.64-12.9 ka (Makos et al., 2014). A renewed glaciation within the Younger Dryas (12.9-11.5...

Ore mineralisations from the Nízke Tatry Mts., assigned to a number of mineralisation stages, were dated in this work by U/Pb analysis by laser ablation-sector field-inductively coupled plasma-mass spectrometry (LA-SF-ICP-MS), Re/Os, chemical Th/U/total Pb isochron method (CHIME), and U-total Pb methods. The samples originated mostly from the large...

Aragonite was found in the Dubina quarry, which is located in the southern part of the Kvetnica Pass (Kozie Chrbty Mts.), 4.8 km to S from Poprad, 2.8 km to NW from Hranovnica, to the southwest slopes of Zámčisko Mts. (921 m), close to Kvetnica settlement (local part of Poprad). Aragonite forms a fill of a steeply inclined fissure located in a wide...

The aim of this paper is to clarify the mineralogical and genetic aspects of the copper ore occurrence hosted in the paleobasalts of the Hronicum unit at the Banská Bytrica-Lazina locality, and its comparison with similar occurrences in the same geological environments in Slovakia (Kozie Chrbty Mts., Malé Karpaty Mts.). The two main mineral associa...

The Biely Vrch deposit in the Western Carpathians is assigned to the shallow, sulfide-poor porphyry gold deposit type and has an exceptionally low Cu/Au ratio. According to 3-D geochemical models, there is a limited spatial correlation between Au and Cu due to the primary introduction of gold by a salt melt and Cu by low-density vapor. Despite a ro...

Mineral association with uranyl-oxide hydroxy–hydrates and uranyl carbonate–silicates was found in J-1 quartz vein containing U–Au mineralization at Krátka Dolina Valley (Rožňava district, Slovakia). The vein penetrated Lower Pa-laeozoic graphitic phyllites and metalydites (Vlachovo Fm., Gemeric Unit). Among minerals identified at the site, becquer...

In this contribution, we report new data on mineralogy, alteration patterns, geochemistry, fluid properties and source of fluids for the deposit Nová Baňa, one of the smaller epithermal deposits in the Middle Miocene Štiavnica andesite stratovolcano (Western Carpathians, Slovakia). Ore veins and the associated rocks were studied in samples from out...

The aim of this paper is to clarify the mineralogical and genetic aspects of the copper ore occurrence hosted in the paleobasalts of the Hronicum unit at the Banská Bytrica-Lazina locality, and its comparison with similar occurrences in the same geological environments in Slovakia (Kozie Chrbty Mts., Malé Karpaty Mts.). The two main mineral associa...

Phosphuranylite was found in quartz vein fragment near the Lower Clement gallery, in Majerská Valley, about 3.5 km to the NE from Čučma village (Rožňava district). Quartz-apatite veins with REE-U mineralization here are localized mainly in Silurian metarhyolites and their volcanoclastics of the Bystrý Potok Formation (Gemeric Unit). A rich yellow p...

Monohydrocalcite (MHC) is considered to be rare mineral in geological settings due to its metastability. It was recently found in old mine gallery at famous abandoned copper deposit-Špania Dolina (central Slovakia) which is popular among mineral collectors for well developed oxidation zone with large amount of secondary minerals. MHC is associated...

The dependence of skeletal alteration on time spent in the taphonomic active zone (TAZ) can generate a taphonomic clock, which can be used to quantify scales of time averaging and rates of skeletal production and recycling in the fossil record. However, the strength of the taphonomic clock is variable in present-day shallow marine environments and...

The results of mineralogical and geochemical research of primary mineralization at the L'ubietova-Podlipa deposit dumps are presented in the article. Chalcopyrite and tennantite are the most abundant sulphides in studied samples. Cobaltite-gersdorffite, pyrite, siegenite, and cassiterite are quite common, yet volumetrically negligible, in contrast...

Laumontite was found in the altered, Miocene pyroxenic andesite at the Píla village (Žarnovica district), Pohronský Inovec Mts. It forms white, fine-crystallic fillings of cracks (up to 3 mm thick) in andesite. Laumontite crystals have prismatic or tabular shape, their average size ranges about 0.3 - 0.5 mm (sporadically occur in size of 1 - 3.5 mm...

Uranophane was identified in Permian arkoses containing uranium mineralization at the Selce village (Banská Bystrica district), Starohorské vrchy Mts. It forms globular aggregates (up to 0.15 mm in size), consist of fibrous, needle like crystals resp. cryptocrystalline coatings and crusts on rocks fissures, also it fills rock cavities. Uranophane h...

Laumontite and heulandite-Ca were found in the cracks and cavities of Permian basalt (Malužiná Formation, Ipoltica Group of the Hronicum Unit), in the eastern part of the Kozie Chrbty Mts., at Spišská Teplica - Štefánikova and Lučivná - Lopušná Dolina localities. Laumontite has a relatively monotonous chemical composition, only K content reaches up...

Uranophane was identified in Permian arkoses containing uranium mineralization at the Selce village (Banská Bystrica district), Starohorské vrchy Mts. It forms globular aggregates (up to 0.15 mm in size), consist of fibrous, needle like crystals resp. cryptocrystalline coatings and crusts on rocks fissures, also it fills rock cavities. Uranophane h...

Laumontite and heulandite-Ca were found in the cracks and cavities of Permian basalt (Malužiná Formation, Ip oltica Group of the Hronicum Unit), in the eastern part of the Kozie Chrbty Mts., at Spišská Teplica - Štefánikova and Lučivná - Lopušná Dolina localities. Laumontite has a relatively monotonous chemical composition, only K content reaches u...

Contents Zusammenfassung 111 Abstract 111 1. Introduction 102 2. Metasediments with "Bündnerschiefer" LithologyinthePozdisovce-lhacovceUnit 114 3. Metamorphosed Eocene Flysch Sequences in the Pozdisovce-lhacovce Unit 115 4. Ultrabasic Bodies, Volcanic Rocks and Volcanoclastic Horizons in the Complexes of the Pozdisovce-lhacovce Unit 116 5. Overthru...

The Neogene Central Slovakia Volcanic Field in the Carpathian arc contains various Au deposits, hosted by central zones of large andesite stratovolcanoes. Fluids involved in mineralization have been studied at three different types of deposit, mostly by fluid inclusion and stable isotope techniques. The Roza´lia mine in the S ˇ tiavnica stratovolca...

Sedimentological, palynological, clay mineralogical and carbon isotope studies were carried out on the Triassic/Jurassic (T/J) boundary interval in the NW Tethyan realm. The analyses are based on two sections in the Slovakian Tatra Mountains (western Carpathians): the Široký Žľab section in the Meďodoly Valley and the Furkaska section above the Jur...

The phosphate–sulphate mineralization occurs in quartz veins in Lower Triassic metaquartzites of the Tribeč Mts., Central Western Carpathians, Slovakia. The mineralization comprises of lazulite, Ba, Sr, Ca, K-rich phosphates–sulphates and barite in an association with muscovite, hematite, locally rutile, zircon, chlorite and tourmaline. The most wi...

To reveal a model of the polystage evolution of an orogenic wedge subsequent to two subductions, Ar/Ar dating of white micas (Wmca) across the shear zones in the Central Western Carpathians (CWC) has been carried out. This wedge is limited by the two suture zones, as a remnant after subducted oceanic crust of the Neotethyan Meliatic (in the S) and...

Hydrothermal quartz from mineralized joints of the Carpathian accretionary wedge contains immiscible aqueous, oil-condensate, methane and carbon dioxide-rich fluid inclusions. Distribution patterns of the inclusion trapping PT parameters point to a crack-seal mechanism during upward and lateral migration of hot methane-rich fluids from overpressure...

Diagenesis in the Podhale and Orava Paleogene flysch basins and in the underlying Mesozoic structural units was studied by XRD measurement of the percent smectite in the mixed-layer illite-smectite from shales and K-Ar dating of the illite-smectite from bentonites, supported by XRD quantitative mineral analysis, grain density, and porosity measurem...

The effect of a saline environment on illitization in volcanoclastic rocks is examined in deep boreholes in the East Slovak Basin. Based on X-ray diffraction analysis, it is concluded that illite-smectite (I-S) expandability is always less in the salt-bearing bentonites (SBB) than in the salt-free bentonites (SFB) for a given depth interval. These...

Newly formed, synkinematically grown minerals in basal cataclasites of the thin-skinned Muráň nappe contain primary fluid inclusions which represent samples of a hydraulic lubricant of the overthrusting nappe block. The inclusion fluid corresponds to a high-salinity brine (37–58 wt% NaCl eq.) of the system Na-K-Ca-Mg-Cl-SO4-CO2. Trapping temperatur...

Blocky accummulations of ophicalcites have been described from the Magura Unit for the first time. They seam to be the Alpine ophiolites, related to the Magura basement.

Trioctahedral clay minerals occurring as phyllosilicate cement in diagenetically altered serpentinitic graywackes have been studied using X-ray powder diffraction, scanning electron microscopy, and microprobe analyses. Two distinct cement assemblages were observed: (1) saponite ± calcite ± dolomite ± opal-CT ± pyrite, which is restricted to quartz-...

The work deals with metamorphic petrology of the rock complexes forming the Pozdisovce-Inacovce Unit. They are thick complexes of metasediments intercalated by stratiform metaultramafic intrusions and layers of metavolcanic rocks, the "Bundnerschiefer' lithology of which indicates that they belong to the Penninicum. In the phyllitic rocks the deter...

The paper deals with smectite to illite transformation in the different boreholes of the East Slovak Basin with accent on the study of the salt-bearing bentonites and claystones. Illitization is different in salt-bearing rocks in the comparison with common bentonites and claystones in the area. A process of illitization is studied by wetting and dr...