Mineral compositions and phase relations of the complex sulfarsenides and arsenides from Dobšiná (Western Carpathians, Slovakia)

Kiefer, Stefan; Majzlan, Juraj; Chovan, Martin; Števko, Martin

doi:10.1016/j.oregeorev.2017.07.026

Cited by 20 publications

(24 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…pyrite, arsenopyrite, sphalerite, molybdenite and fahlores) [41][42][43]. Oscillatory zoning in gersdorffite was reported from the San Juan de Plan deposit, Spain [44], the high-grade Ni-Co-Fe-As hydrothermal vein ores from Dobšiná (Slovakia) [45], and from Pb-Ag-Zn deposits within the Rogozna ore field, Serbo-Macedonian metallogenic province [46]. The oscillatory variations in As, Ni, and Fe content of individual micro-zones observed within the Clemence gersdorffite suggest physical or chemical fluctuations within the bulk system and disequilibrium in the ore fluids [47].…”

Section: Discussionmentioning

confidence: 99%

The Gersdorffite-Bismuthinite-Native Gold Association and the Skarn-Porphyry Mineralization in the Kamariza Mining District, Lavrion, Greece

et al. 2018

View full text Add to dashboard Cite

Vein-type Pb-Ni-Bi-Au-Ag mineralization at the Clemence deposit in the Kamariza and “km3” in the Lavrion area, was synchronous with the intrusion of a Miocene granodiorite body and related felsic and mafic dikes and sills within marbles and schists in the footwall of (and within) the Western Cycladic detachment system. In the Serpieri deposit (Kamariza area), a porphyry-style pyrrhotite-arsenopyrite mineralized microgranitic dike is genetically related to a garnet-wollastonite bearing skarn characterized by a similar base metal and Ni (up to 219 ppm) enrichment. The Ni–Bi–Au association in the Clemence deposit consists of initial deposition of pyrite and arsenopyrite followed by an intergrowth of native gold-bismuthinite and oscillatory zoned gersdorffite. The zoning is related to variable As, Ni, and Fe contents, indicating fluctuations of arsenic and sulfur fugacity in the hydrothermal fluid. A late evolution towards higher sulfur fugacity in the mineralization is evident by the deposition of chalcopyrite, tennantite, enargite, and galena rimming gersdorffite. At the “km3” locality, Ni sulfides and sulfarsenides, vaesite, millerite, ullmannite, and polydymite, are enclosed in gersdorffite and/or galena. The gersdorffite is homogenous and contains less Fe (up to 2 wt.%) than that from the Clemence deposit (up to 9 wt.%). Bulk ore analyses of the Clemence ore reveal Au and Ag grades both exceeding 100 g/t, Pb and Zn > 1 wt.%, Ni up to 9700 ppm, Co up to 118 ppm, Sn > 100 ppm, and Bi > 2000 ppm. The “km3” mineralization is enriched in Mo (up to 36 ppm), Ni (>1 wt.%), and Co (up to 1290 ppm). Our data further support a magmatic contribution to the ore-forming fluids, although remobilization and leaching of metals from previous mineralization and/or host rocks, through the late involvement of non-magmatic fluid in the ore system, cannot be excluded.

show abstract

Section: Discussionmentioning

confidence: 99%

The Gersdorffite-Bismuthinite-Native Gold Association and the Skarn-Porphyry Mineralization in the Kamariza Mining District, Lavrion, Greece

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Many of the studies listed above have attributed As mobilization to magmatic processes, such as incorporation of an As-rich assimilant into magma (Godel et al , 2012), or leaching of As from crustal rocks by hydrothermal fluids (Le Vaillant et al , 2015). Kiefer et al (2017) have also attributed the formation of complex sulfarsenide and arsenide mineralization in the Dobšiná deposit (Slovakia) to the activity of fluids operating at temperatures <200°C. In the Bou Azzer ophiolite (southern Morocco), Ahmed et al (2009 b ) suggested mobilization of As and Co from serpentinite to acidic (magmatic) fluids, at high fluid-rock ratios.…”

Section: Discussionmentioning

confidence: 99%

Platinum-group element remobilization and concentration in the Cliff chromitites of the Shetland Ophiolite Complex, Scotland

et al. 2018

View full text Add to dashboard Cite

The ~492 Ma Shetland Ophiolite Complex contains an extensive mantle section, within which numerous podiform chromitite bodies formed during melt percolation in a supra-subduction zone setting. One of the Shetland ophiolite chromitite localities has an unusual style of platinum-group element (PGE) mineralization. Specifically, the Cliff chromitite suite has relatively high (>250 ppm) Pt plus Pd, compared to other chromitites in the Shetland Ophiolite Complex. In this study, we apply petrographic observation, mineral chemistry and novel X-ray microtomography data to elucidate the petrogenesis of PGE-bearing phases at Cliff. The combined datasets reveal that the PGE at Cliff have probably been fractionated by an As-rich fluid, concentrating Pt and Ir into visible (0.1–1 µm) platinum-group minerals (PGM) such as sperrylite and irarsite, respectively. The high (>1 ppm) bulk-rock concentrations of the other PGE (e.g. Os) in the Cliff chromitites suggests the presence of abundant fine-grained unidentified PGM in the serpentinized groundmass. The spatial association of arsenide phases and PGM with alteration rims on Cr-spinel grains suggests that the high Pt and Pd abundances at Cliff result from a late-stage low-temperature (e.g. 200–300°C) hydrothermal event. This conclusion highlights the potential effects that secondary alteration processes can have on modifying and upgrading the tenor of PGE deposits.

show abstract

“…Fuchsite samples were collected from the Martini vein system (DR3 -underground from the Remény adit and DE-1 from the dump of the Lower Ezechiel adit). Samples rich in the hydrothermal Ni-Co arsenides were collected by Halahyjová- Andrusovová (1961Andrusovová ( , 1964 from both vein systems and recently re-investigated by Kiefer et al (2017).…”

Section: Samples and Methodsmentioning

confidence: 99%

“…The ore mineralizations around the small township Dobšiná in eastern Slovakia include many hydrothermal veins that contain siderite, quartz, arsenides, and sulfides of Ni, Co, Cu, Sb (Halahyjová-Andrusovová 1961, 1964Grecula et al 1995;Mesarčík et al 2001;Kiefer et al 2017). Additionally, metasomatic bodies of siderite/ ankerite were mined here in the past.…”

Section: Introductionmentioning

confidence: 99%

“…This contribution makes use of the substantial progress in geochronological techniques and addresses the question of the age of the Gemeric mineralization systems in a case study in Dobšiná. We are presenting LA-MC-ICP-MS U/Pb dating of hydrothermal siderite and ankerite from Dobšiná, K/Ar ages of the Crmica (fuchsite) closely associated with the ore veins, and Re/Os dating of gersdorffite, a major ore mineral of the hydrothermal veins studied (Halahyjová-Andrusovová 1961, 1964Kiefer et al 2017).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Geochronological constraints on the carbonate-sulfarsenide veins in Dobšiná, Slovakia: U/Pb ages of hydrothermal carbonates, Re/Os age of gersdorffite, and K/Ar ages of fuchsite

Kiefer¹,

Števko²,

Vojtko³

et al. 2020

J. Geosci.

View full text Add to dashboard Cite

The abandoned deposit Dobšiná in eastern Slovakia used to be exploited for Ni-Fe-Co sulfarsenides in siderite-ankerite hydrothermal veins. These veins are locally accompanied by alteration zones of fuchsite-quartz-carbonate rocks. The Ni-Fe-Co sulfarsenides are postdated by chalcopyrite and tetrahedrite. This work aims to determine the age of these mineralizations utilizing U/Pb, Re/Os, and K/Ar dating of selected minerals. U/Pb dating of hydrothermal siderite and ankerite gave ages from 145 ± 5 Ma to 114 ± 24 Ma. They broadly coincide with the metamorphic peak in the Gemeric Unit and the formation of the Gemeric cleavage fan (CGF) during partial exhumation of this unit. Hydrothermal gersdorffite was dated (Re/Os) to 93.6 ± 0.9 Ma, the time of exhumation of the Gemeric unit. No data were extracted for the younger Cu sulfides. By correlation with other units in the Western Carpathians, they could be assigned Late Cretaceous age, corresponding to welding of the Gemeric and Veporic units and the formation of the Trans-Gemeric shear zone. The fuchsite rocks were dated (K/Ar) to 110 Ma, but this datum conflicts with textural evidence, which shows that these rocks are older than the hydrothermal carbonates. The age of 110 Ma is therefore considered to be cooling age after the reset of the geochronometer by the Alpine metamorphism, in agreement with earlier data. The geochronological results are supported by structural measurements and field observations. The main mineralized zone, investigated in one of the accessible adits, conforms with the Variscan-?Alpine metamorphic foliation. There are also younger, less significant structures whose relevance to the ore mineralization is not yet clear.

show abstract

Mineral compositions and phase relations of the complex sulfarsenides and arsenides from Dobšiná (Western Carpathians, Slovakia)

Cited by 20 publications

References 32 publications

The Gersdorffite-Bismuthinite-Native Gold Association and the Skarn-Porphyry Mineralization in the Kamariza Mining District, Lavrion, Greece

The Gersdorffite-Bismuthinite-Native Gold Association and the Skarn-Porphyry Mineralization in the Kamariza Mining District, Lavrion, Greece

Platinum-group element remobilization and concentration in the Cliff chromitites of the Shetland Ophiolite Complex, Scotland

Geochronological constraints on the carbonate-sulfarsenide veins in Dobšiná, Slovakia: U/Pb ages of hydrothermal carbonates, Re/Os age of gersdorffite, and K/Ar ages of fuchsite

Contact Info

Product

Resources

About