Peter Koděra

Peter Koděra
Comenius University Bratislava · Faculty of Natural Sciences

Professor

About

53
Publications
16,620
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521
Citations
Citations since 2017
17 Research Items
299 Citations
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060

Publications

Publications (53)
Article
Ferrous hydroxychlorides are geochemically important but less recognized mineral species due to their extreme sensitivity to oxidation and hydration in contact with air {typically they convert to akaganéite [Fe3+(O,OH,Cl)]}. Only the γ-form was previously known as the orthorhombic mineral hibbingite, associated with altered mafic intrusive rocks. I...
Article
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...
Article
Solid daughter phases in fluid and salt melt inclusions in minerals provide important clues to characterization of mineral‐forming processes. The analysis of the fluid inclusions often requires the exposure of the daughter minerals. Rinneite (K3NaFeCl6), which is a hygroscopic mineral, decomposes in air and cannot thus be identified by conventional...
Article
The factors that control the fertility (e.g. capacity to form an ore deposits) of a magmatic system are still a matter of debate, requiring more studies on the evolution of ore-related magmas. This study presents a detailed reconstruction of the magmatic system forming the Štiavnica volcano, the biggest mineralized center of the Western Carpathians...
Article
Full-text available
A unique metallogenic type of Au mineralization was discovered in Mesozoic carbonates belonging to the Bôrka nappe accretion mélange near Rochovce. The mineralization is structurally controlled by faults formed during several stages of Alpine deformation. Widespread dolomitization, along with sericite and pyrite alteration of marbles, indicate exte...
Article
The effect of magmatic sulfide precipitation on the potential of magmatic systems to produce porphyry-type ore deposits is still a matter of debate. In particular, we need to know whether magmatic sulfide precipitation has an impact on the Cu and Au content of the exsolving magmatic volatile phases and, by this way, on the Cu/Au ratio of porphyry d...
Article
Full-text available
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...
Article
Full-text available
The Au-Ag-Pb-Zn-Cu epithermal deposit Banská Hodruša of intermediate-sulphidation type is located in the Middle Miocene Štiavnica stratovolcano on the inner side of the Carpathian arc in Slovakia. This deposit represents an unusual subhorizontal multi-stage vein system, related to processes of underground cauldron subsidence and exhumation of a sub...
Article
Anhydrous chlorides - CaCl2, and KCaCl3 (chlorocalcite) were identified as mineral inclusions in halite from the Siberian Large Igneous Province at the contact of magmatic intrusions and evaporates. Chlorocalcite was also found as daughter mineral in polyphase hypersaline inclusions. While Raman spectra of KCaCl3 (chlorocalcite) in natural inclusio...
Conference Paper
Full-text available
Rutile is a widely distributed mineral in alteration haloes associated with a variety of hydrothermal and metamorphosed ore deposits, and although poorly studied, anomalous rutile compositions appear to reflect significant metal concentrations in many types of orebodies. Ochtiná W-Mo deposit represents vein-stockwork and disseminated tungsten miner...
Article
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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...
Article
Javorieite, KFeCl3, is a new mineral, commonly hosted by salt melt inclusions enclosed in vein quartz in the Biely Vrch porphyry gold deposit, in the Central Slovakia Volcanic Field in the Western Carpathians. The mineral name refers to the Javorie stratovolcano, which hosts most porphyry gold systems in this volcanic field. Within the inclusions,...
Article
Full-text available
Borate minerals of the ludwigite group (LGM) and szaibélyite in association with hydroxylclinohumite, clinochlore, a serpentine mineral, magnesian magnetite, spinel, magnesite, dolomite and sulphide minerals, occur in a magnesian exoskarn in the R-20 borehole located in the Vysoká – Zlatno Cu-Au porphyry-skarn deposit, located within the Štiavnica...
Article
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Abstract: Beluj magmatic-hydrothermal centre is a small porphyry gold occurrence related to an andesite/diorite porphyry intrusion, located in the mantle of the Štiavnica stratovolcano in the Central Slovakia Volcanic Field. The upper part of the intrusion is affected by K-silicate alteration (biotite, magnetite, K-feldspar) that is in deeper parts...
Article
Full-text available
The existence of underground karst cavities in magnesite deposits in Slovakia was indicated already at the end of the 1950s. Their speleological survey started only from 1983, when the caves were investigated in magnesite deposits Podrečany, Burda, Lubeník and Bankov in the Carboniferous rock belt 120 km long between Lučenec and Košice towns, locat...
Article
Full-text available
Here we present new data for samples from Treiboltz, Rabenstein, Bursa, Trojkráľová, and Schöpfer, all occurrences of epithermal ores in the Banská Štiavnica-Hodruša-Hámre ore district. The ores at Treiboltz and Rabenstein are simple hydrothermal breccias or silicified zones. The breccias contain strongly altered lithoclasts, the ore-bearing quartz...
Article
Full-text available
In the year 2006 the company EMED Slovakia determined at the locality of Biely Vrch near Detva the presence of a new type of porphyry mineralisation with a relatively high Au/Cu ratio that in the literature is marked as Au-porphyry mineralisation. This type of mineralisation was not described in Western Carpathians yet. Low content of metals and bi...
Article
Full-text available
The Prochot-Lazy area hosts a poorly known historical epithermal precious metal deposit hosted by andesites of the Lower structural unit of the Štiavnica Stratovolcano. According to current exploration, this locality consists of two roughly parallel mineralised zones. The Main zone is probably related to a regional fault and it was followed by old...
Article
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Several caves of hydrothermal origin in crystalline limestones and metasomatic silicites were investigated in the central zone of the Štiavnica stratovolcano, Štiavnické vrchy Mountains, central Slovakia. Evidence of hydrothermal origin includes irregular spherical cave morphology sculptured by ascending thermal water, occurrence of large calcite c...
Article
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Chlorine-enriched tourmaline was found in a hydrothermally altered Miocene diorite porphyry at the Biely Vrch porphyry gold deposit (Central Slovakia) as a relatively rare alteration mineral forming radial aggregates composed of thin prismatic crystals in the central part of quartz veinlets filled by calcite. Zoned tourmaline with Cl-enriched centr...
Article
Kerimasite {Ca3}[Zr2](SiFe3+2)O12, a rare member of the garnet supergroup, has been identified in association with andradite–grossular and their hydrated analogues, monticellite, perovskite, clintonite, anhydrite, hydroxylellestadite–fluorellestadite, spinel, magnetite, brucite, valeriite and other minerals from a Ca-Mg skarn in the exocontact of a...
Poster
Full-text available
Mineralogy of neogene epithermal precious metal mineralization at Central Slovakia Neovolcanites
Article
The recently discovered Biely Vrch deposit in the Western Carpathian magmatic arc is the most extreme example of a porphyry gold deposit, being practically free of copper, molybdenum or any other sulfide minerals. Microanalytical data on fluid inclusions in quartz veinlets, including a characteristic type of banded veinlets, show that this deposit...
Article
Full-text available
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...
Article
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Siderite-quartz-sulphidic veins in the Kohút Zone of Veporic Unit, are best developed at Cinobaňa, Lovinobaňa, and Uderiná villages, in vicinity of the Veporic/Gemeric Units tectonic contact (the Lubeník-Margecany Zone). The mineralization occurs at the small historical deposits, localised within Alpine shear zones (NNE - SSW to W - E directions) i...
Article
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The Detva-Biely Vrch deposit represents a new economic Au-porphyry mineralization discovered in central Slovakia. The deposit is located in the central zone of the Middle Miocene Javorie stratovolcano, and shares many properties typical for Au-porphyry deposits. Parental intrusion of diorite to andesite porphyry and its andesitic volcanic host rock...
Article
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In this paper we describe the first occurrence of cobaltpentlandite in Slovak Republic. Cobaltpentlandite was found in borehole the R-1 in depth 677 m in Ca-Mg skarn at the Cu-Au skarn-porphyry deposit Vysoká-Zlatno. One grain of cobaltpentlandite forms euhedral crystal up to 0.014 mm in size and it is chemically homogenous. It occurs in assemblage...
Article
In the Early Cretaceous, the continental rift basin of the Mecsek Mts. (Hungary), was situated on the southern edge of the European plate. The opening of the North Atlantic Ocean created a dilatational regime that expanded to the southern edge of the European plate, where several extensional basins and submarine volcanoes were formed during the Ear...
Article
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Kerimasite Ca 3Zr 2(Fe 3+2Si)O 12, a rare member of garnet supergroup, was identified by EMPA in Ca-Mg skarn on the contact between Miocene granodiorite porphyry intrusion and Middle Triassic dolomites in a borehole from the Cu-Au skarn-porphyry deposit Vysoká-Zlatno near Banská Štiavnica (Štiavnické Vrchy Mts., Central Slovakia). Kerimasite forms...
Article
Primary fluid inclusions in metasomatic magnesite deposits hosted in Palaeozoic basement of the Western Carpathians are filled with of low-to-moderately saline aqueous solutions, with locally increased CO2 concentrations (up to 34 mol.%). Brine inclusions with up to 42 wt.% of dissolved salts are less frequent. K/Na ratios in the fluid inclusion le...
Article
Full-text available
The central zone of the Miocene Štiavnica stratovolcano hosts several occurrences of Cu–Au skarn–porphyry mineralisation, related to granodiorite/quartz–diorite porphyry dyke clusters and stocks. Vysoká–Zlatno is the largest deposit (13.4Mt at 0.52% Cu), with mineralised Mg–Ca exo- and endoskarns, developed at the prevolcanic basement level. The al...
Article
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Conference title - 9. Vyrocny predvianocny seminar Slovenskej geologickej spolocnosti--9th Annual seminar of the Slovak Geological Society, Copyright - GeoRef in Process, Copyright 2013, American Geosciences Institute. After editing and indexing, this record will be added to Georef., Language of summary - Undetermined, Pages - 488, ProQuest ID - 88...
Article
Full-text available
The central zone of the large Miocene Štiavnica stratovolcano in the Western Carpathians hosts epithermal Au mineralization of intermediate-sulfidation type, located at deep levels of the historic Rozália base-metal mine at Banská Hodruša. The Au mineralization occurs as subhorizontal veins at the base of pre-caldera andesites, close to the roof of...
Article
The central zone of the Miocene Stiavnica stratovolcano (Western Carpathians) hosts an extensive subvolcanic intrusive complex dominated by a granodiorite pluton (14.5-15.5 Ma). The granodiorite intrusion has a bell-jar form and was emplaced mainly into basement rocks, although its central part extends to the base of a subvolcanic and volcanic ande...
Article
Košice deposit is the second biggest magnesite deposit in Slovakia (150 Mt), located in the eastern part of the Gemeric unit. The main Mg-carbonate body is hosted by Carboniferous limestone and dolomitic limestone, while footwall black schists contain thin carbonate lenses replaced by Fe-carbonates. Paleozoic rocks were affected by low-grade metamo...
Article
This paper summarizes recent data about magnesite and talc genesis in Carboniferous host rocks of Western Carpathians (Slovakia), which occur in two distinct belts in tectonic superunit Veporicum and its contact zone with Gemericum. The northern Sinec magnesite and talc belt (with main deposits Kokava, Sinec, Samo, Hnúšt'a-Mútnik) contains economic...
Article
Gemerská Poloma deposit is an important talc deposit (20 Mt of talc), located in the Gemeric unit within Western Carpathians. The partly steatizated Mg-carbonatic carbonate body was formed inside Early Paleozoic volcano-sedimentary complexes (black schist, metapelite) , regionally metamorphosed during Variscan metamorphic event ( M1 ) in chlorite-b...
Article
Full-text available
This paper summarizes recent data about magnesite and talc genesis in Carboniferous host rocks of Western Carpathians (Slovakia), which occur in two distinct belts in tectonic superunit Veporicum and its contact zone with Gemericum. The northern Sinec magnesite and talc belt (with main deposits Kokava, Sinec, Samo, Hnúšt'a-Mútnik) contains economic...
Article
Full-text available
Evidence is presented for retrograde reaction of silicate minerals with saline brine inside fluid inclusions during post-entrapment cooling. Ferropyrosmalite [(Fe,Mn)8Si6O15(OH,Cl)10 where Fe>>Mn] has previously been interpreted as a daughter mineral in saline inclusions in magmatic quartz from altered granodiorite associated with the Vyhne-Klokoč...
Article
Full-text available
Two type localities, located in two different geological and metamorphic units, have been studied. The Hnúšt'a-Mútnik deposit is located in amphibolite facies rock sequences of the Veporic unit, while the Miková-Jedl'ovec deposit (a part of the Dúbrava massive) is located in greenschists facies sequences of the Gemeric unit. On both localities succ...
Article
Summary Vyhne-Klokoc, the largest Fe-Skarnn deposit in the Western Carpathians, is related to the emplacement of a large granodiorite pluton in the central zone of a Neogene stratovolcano. Skarn mineralisation is developed in places where apophyses of the pluton intruded basement carbonates. Granodiorite in the apophyses grades into rocks of granit...
Article
Full-text available
This paper presents a new genetic model for the epithermal Au-mineralization based on new fluid inclusion and stable isotope data. The Au-mineralization occurs as subhorizontal veins at the base of pre-caldera stage andesites. It evolved during two stages, both associated with boiling fluids of low salinity (0-3 wt% NaCl eq.) and moderate temperatu...

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