Tourmalines from the siderite-quartz-sulphide hydrothermal veins, Gemeric unit, western Carpathians, Slovakia: crystal chemistry and evolution

2017 ◽  
Vol 112 (1) ◽  
pp. 45-63 ◽  
Author(s):  
P. Bačík ◽  
P. Uher ◽  
J. Dikej ◽  
Ľ. Puškelová
Keyword(s):  
Crystal Chemistry ◽  
Western Carpathians ◽  
Gemeric Unit ◽  
Hydrothermal Veins

U–Pb ages of detrital zircons from Paleozoic metasandstones of the Gelnica Terrane (Southern Gemeric Unit, Western Carpathians, Slovakia): evidence for Avalonian–Amazonian provenance

2011 ◽  
Vol 101 (4) ◽  
pp. 919-936 ◽  
Author(s):  
Anna Vozárová ◽  
Katarína Šarinová ◽  
Nickolay Rodionov ◽  
Dušan Laurinc ◽  
Ilya Paderin ◽  
...  
Keyword(s):  
Detrital Zircons ◽  
Western Carpathians ◽  
Gemeric Unit

scholarly journals Re-Os and U-Th-Pb dating of the Rochovce granite and its mineralization (Western Carpathians, Slovakia)

2013 ◽  
Vol 64 (1) ◽  
pp. 71-79 ◽  
Author(s):  
Milan Kohút ◽  
Holly Stein ◽  
Pavel Uher ◽  
Aaron Aimmerman ◽  
L’ubomír Hraško
Keyword(s):  
Oscillatory Zoning ◽  
Western Carpathians ◽  
Alkaline Magmatism ◽  
Calc Alkaline ◽  
Collisional Orogen ◽  
Granite Intrusion ◽  
Metallogenic Belt ◽  
Central Western Carpathians ◽  
Lower Crustal ◽  
Gemeric Unit

Abstract The subsurface Rochovce granite intrusion was emplaced into the contact zone between two principal tectonic units (the Veporic Unit and the Gemeric Unit) of the Central Western Carpathians (CWC), Slovakia. The Cretaceous age of this granite and its Mo-W mineralization is shown using two independent methods: U-Pb on zircon and Re-Os on molybdenite. The studied zircons have a typical homogeneous character with oscillatory zoning and scarce restite cores. SHRIMP U-Pb data provide an age of 81.5 ± 0.7 Ma, whereas restite cores suggest a latest Neoproterozoic-Ediacaran age (~565 Ma) source. Zircon εHf(81) values -5.2 to + 0.2 suggest a lower crustal source, whereas one from the Neoproterozoic core εHf(565)= + 7.4 call for the mantle influenced old precursor. Two molybdenite- bearing samples of very different character affirm a genetic relation between W-Mo mineralization and the Rochovce granite. One sample, a quartz-molybdenite vein from the exocontact (altered quartz-sericite schist of the Ochtiná Formation), provides a Re-Os age of 81.4 ± 0.3 Ma. The second molybdenite occurs as 1-2 mm disseminations in finegrained granite, and provides an age of 81.6 ± 0.3 Ma. Both Re-Os ages are identical within their 2-sigma analytical uncertainty and suggest rapid exhumation as a consequence of post-collisional, orogen-parallel extension and unroofing. The Rochovce granite represents the northernmost occurrence of Cretaceous calc-alkaline magmatism with Mo-W mineralization associated with the Alpine-Balkan-Carpathian-Dinaride metallogenic belt.

scholarly journals Boudinage arrangement tracking of hydrothermal veins in the shear zone: example from the argentiferous Strieborna vein (Western Carpathians)

2019 ◽  
pp. 179-195
Author(s):  
S. Jacko ◽  
R. Farkašovský ◽  
J. Kondela ◽  
T. Mikuš ◽  
B. Ščerbáková ◽  
...  
Keyword(s):  
Shear Zone ◽  
Western Carpathians ◽  
Hydrothermal Veins

Chemical composition and evolution of tourmaline-supergroup minerals from the Sb hydrothermal veins in Rožňava area, Western Carpathians, Slovakia

2017 ◽  
Vol 111 (4) ◽  
pp. 609-624 ◽  
Author(s):  
Peter Bačík ◽  
Jakub Dikej ◽  
Jana Fridrichová ◽  
Marcel Miglierini ◽  
Martin Števko
Keyword(s):  
Chemical Composition ◽  
Western Carpathians ◽  
Hydrothermal Veins

Magmatic and post-magmatic Y-REE-Th phosphate, silicate and Nb-Ta-Y-REE oxide minerals in A-type metagranite: an example from the Turčok massif, the Western Carpathians, Slovakia

2009 ◽  
Vol 73 (6) ◽  
pp. 1009-1025 ◽  
Author(s):  
P. Uher ◽  
M. Ondrejka ◽  
P. Konečný
Keyword(s):  
Solid Solution ◽  
Electron Microprobe ◽  
Western Carpathians ◽  
Accessory Mineral ◽  
Metamorphic Overprint ◽  
Mineral Assemblages ◽  
Oxide Phases ◽  
Phosphate Silicate ◽  
Compositional Variations ◽  
Gemeric Unit

AbstractAn electron microprobe study of Y-REE-Th phosphate, silicate and Nb-Ta-Y-REE accessory-mineral assemblages revealed the compositional variations and evolution in post-orogenic, hypersolvus Permian A-type metagranite from Turčok, in the Gemeric Unit, of the Western Carpathians, eastern Slovakia. Prismatic zircon I and allanite-(Ce) are primary magmatic phases. However, the late-magmatic to early-subsolidus processes led to the formation of a more complex younger assemblage: bipyramidal zircon II, xenotime-(Y), thorite, gadolinite-hingganite-(Y), Nb-Ta-Y-REE oxide phases [fergusonite-(beta)/ samarskite-(Y), aeschynite/polycrase-(Y), and Nb-rich rutile?] and possibly monazite-(Ce). However, monazite-(Ce) and the partial alteration of allanite-(Ce), xenotime-(Y) and the Nb-Ta-Y-REE minerals are probably connected with a younger Alpine metamorphic overprint of the granite. Thorite appears as a solid solution in the thorite-xenotime-zircon series; it is also enriched in Al. Fergusonite-(beta)/ samarskite-(Y) and especially aeschynite/polycrase-(Y) show increased P, Si and Al contents.

Alpine oxidation of lithium micas in Permian S-type granites (Gemeric unit, Western Carpathians, Slovakia)

2014 ◽  
Vol 78 (3) ◽  
pp. 507-533 ◽  
Author(s):  
I. Petrík ◽  
Š. Čík ◽  
M. Miglierini ◽  
T. Vaculovič ◽  
I. Dianiška ◽  
...  
Keyword(s):  
Mossbauer Spectroscopy ◽  
Drill Hole ◽  
Western Carpathians ◽  
Low Grade ◽  
Icp Ms ◽  
Granitic Intrusion ◽  
Metamorphic Assemblage ◽  
Alpine Metamorphism ◽  
Upper Level ◽  
Gemeric Unit

AbstractLithium micas of the zinnwaldite and phengite–Li-phengite series occur as characteristic minerals in Permian Li-F-(P) granites of the western Gemeric unit (Western Carpathians) accompanied by topaz, tourmaline, Nb, Ta, Ti, Sn oxides and aluminophosphates. The calculated Li2O contents of all the mica analysed, together with Rb2O and Cs2O were confirmed by LA-ICP-MS analyses for all the identified micas. Samples from three localities were investigated: two surficial (Surovec, Vrchsúl’ová); and one drill hole (Dlhá dolina). Zinnwaldite (polylithionite) occurs in the upper level of the Dlhá dolina granitic intrusion and in the nearby shallow satellite body of Surovec. The lower level porphyritic granites contain only siderophyllite. The Vrchsúl’ ová micas are closer in composition to Li-annite and siderophyllite. Dioctahedral micas are mostly phengites, although zinnwaldite-bearing granites are rich in late-crystallizing Li-phengite, which extensively replaces earlier zinnwaldite. The secondary Liphengite and phengite are interpreted as products of Alpine metamorphism during Cretaceous burial and subsequent exhumation of the Gemeric unit. Reactions are suggested explaining the formation of Li-phengite by reaction of zinnwaldite with phengite or with muscovite. All mica types were investigated by Mössbauer spectroscopy, which showed high degrees of oxidation (25–50% Fe3+ of total Fe) with the exception of zinnwaldite from Vrchsúl’ová, which may have preserved an original, reduced value of 10%. The metamorphic assemblage present permitted calculation of P-T-X conditions: T = 184°C, P = 320 MPa, with oxidation of siderophyllite to phengite + goethite and fO2 at ΔNN = 4.7, confirming the low-grade conditions of the Alpine metamorphism in agreement with previous estimates.

scholarly journals Permian single crystal U-Pb zircon age of the Rožňava Formation volcanites (Southern Gemeric Unit, Western Carpathians, Slovakia)

2009 ◽  
Vol 60 (6) ◽  
pp. 439-448 ◽  
Author(s):  
Anna Vozárová ◽  
Miloš Šmelko ◽  
Ilya Paderin
Keyword(s):  
Single Crystal ◽  
Volcanic Activity ◽  
Late Ordovician ◽  
Western Carpathians ◽  
Magmatic Zircon ◽  
Zircon Age ◽  
Zircon Population ◽  
Growth Zoning ◽  
Gemeric Unit ◽  
Rock Complex

Permian single crystal U-Pb zircon age of the Rožňava Formation volcanites (Southern Gemeric Unit, Western Carpathians, Slovakia)Zircon populations from the Rožňava Formation volcanic rock complex have been analysed. Euhedral zircons from the 1stvolcanogenic horizon with fine oscillatory growth zoning, typical of magmatic origin, gave the average concordia age of 273.3 ± 2.8 Ma, with Th/U ratios in the range of 0.44-0.73. The Permian ages ranging from 266 to 284 Ma were identified in the wider, zoned or unzoned, central zircon parts, as well as in their fine-zoned oscillatory rims. The average concordia age of 275.3 ± 2.9 was obtained from the euhedral zircon population of the 2ndvolcanogenic horizon of the Rožňava Formation. The analyses were performed on zoned magmatic zircons in the age interval from 267 to 287 Ma, with Th/U ratios in the range of 0.39-0.75. In the later zircon population two inherited zircon grains were dated giving the age of 842 ± 12 Ma (Neoproterozoic) and 456 ± 7 Ma (Late Ordovician). The magmatic zircon ages document the Kungurian age of Permian volcanic activity and contemporaneous establishment of the south-Gemeric basin. The time span of volcanic activity corresponds to the collapse of the Western Carpathian Variscan foreland which expanded southward.

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