Abstract
Tourmaline is an important gangue mineral in a large number of Cretaceous siderite-quartz-sulphide hydrothermal veins in the Gemeric Unit, Slovak Ore Mountains, Slovakia, such as Dobšiná, Vlachovo, Rožňavské Bystré, Hnilčík, Rakovnica, Novoveská Huta, Gretla, Rudňany, and Bindt. In this study we combine by electron microprobe analysis, powder X-ray diffraction, Mössbauer and optical emission spectroscopy to determine the range of tourmaline compositions in the deposits and constrain the mechanisms of its precipitation. Selected samples from the mentioned deposits belong mostly to the alkali group, schorl to dravite series, rarely dominant X-site vacant foititic tourmaline (Vlachovo and Bindt) and oxy-dravite compositions (Hnilčík) were detected. Rim zones of some schorlitic tourmalines show high concentrations of Ti (up to 2.35 wt.% TiO2, 0.30 apfu; Rožňavské Bystré). The chemical composition is mostly controlled by alkali-deficient X□AlNa−1(Mg,Fe2+)−1 and proton-deficient AlO(Mg,Fe2+)−1(OH)−1 substitutions. Titanium is incorporated into the structure by YTiY(Mg,Fe)YAl−2, YTiZMgYAl−1 ZAl−1, YTiO(YAlOH), and XCaYTiZMgO2 X□−1 Y,ZAl−2(OH)−2 substitutions. Along trace elements, Sr and V attain concentrations of ~80–450 and ~70–320 ppm, respectively. The unit-cell parameter a varies between 15.960 and 15.985 Å; variations in c are larger, between 7.177 and 7.236 Å indicating the presence of Fe3+ and Mg2+ at Z site. Mössbauer spectroscopy has shown variable Fe3+ proportions (0.17–0.55 apfu) in all samples. The gathered dataset suggests some qualitative considerations on the mechanisms controlling tourmaline compositions at the regional scale. The highest Fe3+ concentrations occur in samples from Rudňany and Gretla in the external part of Gemeric unit, suggesting higher oxidation during longer transport of fluids. We propose that the determined XFe in the samples are correlated with the compositions of the host rocks, as schorlitic to foititic tourmalines occur in veins located in the meta-rhyolites host, and tourmalines with the highest Mg contents occur in metabasalts.
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Acknowledgements
We thank R. Kováč and M. Maťašovský for field collaboration, J. Sprite and D. Ozdín for assistance during electron-microprobe work, Jozef Lipka and Ignác Tóth for Mössbauer study. We also thank Paolo Garofalo for editorial handling and Andreas Ertl and anonymous referee for their detailed reviews which improved the quality of our work. This work was supported by the Slovak Research and Development Agency under the contracts APVV-0375-12, and the Ministry of Education of Slovak Republic grant agency under the contracts VEGA-1/0079/15 and VEGA-1/0499/16.
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Appendix: sample location and description
Appendix: sample location and description
TU-1: Dobšiná, dumps of the Dedičná gallery, 1200 m ENE of Dobšiná downtown. Association: quartz, siderite, ankerite, tourmaline, chalcopyrite. Host rocks: paragneisses, locally with amphibolites.
TU-2: Vlachovo, dumps of the Július gallery, 1500 NE of Radzim hill (998 m a. s. l.). Association: siderite, tourmaline. Host rocks: acid metapyroclastics to metarhyolites, phyllites.
TU-3: Rožňavské Bystré, Špady-Anton vein, 1700 m NE of Rožňavské Bystré village. Association: siderite, quartz, tourmaline. Host rocks: acid metapyroclastics to metarhyolites, phyllites.
TU-7: Hnilčík, Kaluža vein in the Zlatník quarry, 1800 m NNE of the Grajnár saddle (1023 m a. s. l.). Association: quartz, siderite, ankerite, calcite, tourmaline. Host rocks: metabasalts and their metapyroclastics.
TU-10: Rakovnica, Mier mine, Mních vein, 600 m NW of the Rakovnica village. Association: quartz, siderite, tourmaline. Host rocks: acid metapyroclastics to metarhyolites, sandstones to conglomerates.
TU-22: Novoveská Huta, dumps of the Johanis (Johanni) mine, H-6 or H-7 vein, 900 m NNE of Suchá hill (898 m a. s. l.). Association: quartz, calcite, ankerite, Fe-rich dolomite, barite, tourmaline. Host rocks: sandstones to schists, locally conglomerates, acid tuffites to tuffs.
TU-23: Gretla, dumps of the Nová gallery, Piata vein, 800 m WSW of Rysovec hill (804 m a. s. l.), 3500 m SW of the Teplička village. Association: siderite, calcite, quartz, tourmaline. Host rocks: conglomerates, schists.
TU-25: Rudňany, dumps of the Zlatník vein, 1500 m WNW of Vysoký hill (874 m a. s. l.). Associaton: siderite, quartz, tourmaline. Host rocks: schists, rarely conglomerates.
TU-31 Bindt, dumps of Hrubá vein, 2000 m SE of Rysovec hill (804 m a. s. l.). Association: siderite, quartz, tourmaline. Host rocks: schists, conglomerates, phyllites.
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Bačík, P., Uher, P., Dikej, J. et al. Tourmalines from the siderite-quartz-sulphide hydrothermal veins, Gemeric unit, western Carpathians, Slovakia: crystal chemistry and evolution. Miner Petrol 112, 45–63 (2018). https://doi.org/10.1007/s00710-017-0500-8
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DOI: https://doi.org/10.1007/s00710-017-0500-8