TY - JOUR AU - Vojtko, R. AU - Lačný, A. AU - Jeřábek, P. AU - Potočný, T. AU - Gerátová, S. AU - Kilík, J. AU - Plašienka, D. AU - Lexa, O. TI - Deformation pattern of the Lower Triassic sedimentary formations of the Silica Nappe: Evidence for dynamics of the Western Carpathian orogen JF - JOURNAL OF GEOSCIENCES J2 - J GEOSCI VL - 68 PY - 2023 IS - 3 SP - 229 EP - 248 PG - 20 SN - 1802-6222 DO - 10.3190/jgeosci.377 UR - https://m2.mtmt.hu/api/publication/34473831 ID - 34473831 N1 - Department of Geology and Palaeontology, Faculty of Natural Sciences, Comenius University, Ilkovičova 6, Bratislava, Slovakia State Nature Conservancy of the Slovak Republic, Little Carpathians Protected Landscape Area, Štúrova 115, Modra, 900 01, Slovakia Institute of Petrology and Structural Geology, Charles University, Albertov 6, Prague 2, 128 43, Czech Republic Department of Mineralogy, Petrography and Geochemistry, Faculty of Geology, Geophysics and Environmental Protection, AGH – University of Science and Technology, al. Mickiewicza 30, Kraków, 30-059, Poland Slovak Karst National Park Administration, Hámosiho 188, Brzotín, 049 51, Slovakia Export Date: 3 January 2024 Correspondence Address: Vojtko, R.; Department of Geology and Palaeontology, Ilkovičova 6, Slovakia; email: rastislav.vojtko@uniba.sk LA - English DB - MTMT ER - TY - JOUR AU - Mederski, Slawomir AU - Prsek, Jaroslav AU - Kolodziejczyk, Joanna AU - Kluza, Konrad AU - Melfos, Vasilios AU - Adamek, Katarzyna AU - Dimitrova, Dimitrina TI - Mineralogical and geochemical studies of Cu-Bi-Ag±W ores from Janjevo (Kosovo): Insights into the Bi sulfosalt mineralogy and the distribution of bismuth in base metal sulfides JF - JOURNAL OF GEOSCIENCES J2 - J GEOSCI VL - 68 PY - 2023 IS - 2 SP - 139 EP - 162 PG - 24 SN - 1802-6222 DO - 10.3190/jgeosci.371 UR - https://m2.mtmt.hu/api/publication/34235212 ID - 34235212 AB - This work presents a mineralogical and geochemical study of Cu-Bi-Ag & PLUSMN; W ores from Janjevo in the Trepca Mineral Belt in Kosovo. This locality indicates a new type of Bi-Cu & PLUSMN; Au mineralization within the Kizhnica-Hajvalia-Badovc ore field, including Cu-Bi & PLUSMN; Ag & PLUSMN; As sulfosalts paragenesis previously not described in Kosovo and in this part of the als, as well as their paragenetic relationships and the distribution of minor and trace elements in main ore minerals, are discussed based on microscopy, microprobe, and laser ablation inductively coupled plasma mass spectrometry studies. The Cu-Bi-Ag & PLUSMN; W hydrothermal mineralization in Janjevo was formed during four stages: (1) Early base metal stage, (2) Bismuth stage, (3) Main stage, and (4) Late stage. The Early base metal stage is represented by pyrite, sphalerite I, chalcopyrite I, galena I, bournonite I, tetrahedrite I, siderite, and quartz. The Bismuth stage includes arsenopyrite I, lollingite, native bismuth, galena II, chalcopyrite II, tetrahedrite II, quartz, siderite, and Bi-Pb & PLUSMN; Cu & PLUSMN; Ag sulfosalts: bismuthinite, aikinite, krupkaite, cosalite, and gustavite. The Main stage is represented by chalcopyrite III, tetrahedrite group minerals (tetrahedrite and tennantite) III, galena III, sphalerite II, arsenopyrite II, bournonite II, and siderite. The Cu-Bi & PLUSMN; Ag & PLUSMN; As sulfosalts (pearceite, cupropearceite, wittichenite, and an unknown phase: AgCuBiS3) associated with galena IV, siderite, and quartz were formed in the final low-temperature Late stage. The application of GGIMFis geothermometry on sphalerite gives the following sphalerite precipitation temperatures: 220-272 & DEG;C for sphalerite I and 160-190 & DEG;C for sphalerite II. Presented results show that in addition to numerous Bi sulfosalts in Janjevo Cu-Bi-Ag & PLUSMN;W ores, bismuth has been incorporated into base metal sulfides, as well as arsenopyrite. The main carrier of bismuth is arsenopyrite I, which has started the crystallization of the bismuth stage. LA - English DB - MTMT ER - TY - JOUR AU - Novák, M. AU - Toman, J. AU - Škoda, R. AU - Šikola, D. AU - Mazuch, J. TI - Review of zeolite mineralizations from the high-grade metamorphosed Strážek Unit, Moldanubian Zone, Czech Republic JF - JOURNAL OF GEOSCIENCES J2 - J GEOSCI VL - 68 PY - 2023 IS - 2 SP - 111 EP - 138 PG - 28 SN - 1802-6222 DO - 10.3190/jgeosci.370 UR - https://m2.mtmt.hu/api/publication/34120761 ID - 34120761 N1 - Department of Geological Sciences, Faculty of Science, Masaryk University, Kotlářská 2, Brno, CZ-611 37, Czech Republic Department of Mineralogy and Petrography, Moravian Museum, Zelný trh 6, Brno, CZ-659 37, Czech Republic Diamo, S. E., Branch GEAM, Dolní Rožínka, CZ-592 51, Czech Republic Export Date: 31 August 2023 Correspondence Address: Toman, J.; Department of Mineralogy and Petrography, Zelný trh 6, Czech Republic; email: jtoman@mzm.cz LA - English DB - MTMT ER - TY - JOUR AU - Majzlan, Juraj AU - Stevko, Martin AU - Plasil, Jakub AU - Sejkora, Jiri AU - Dachs, Edgar TI - Thermodynamics of the Cu, Zn, and Cu-Zn phases: zincolivenite, adamite, olivenite, ludjibaite, strashimirite, and slavkovite JF - JOURNAL OF GEOSCIENCES J2 - J GEOSCI VL - 68 PY - 2023 IS - 1 SP - 67 EP - 80 PG - 14 SN - 1802-6222 DO - 10.3190/jgeosci.367 UR - https://m2.mtmt.hu/api/publication/33917627 ID - 33917627 AB - Secondary minerals, especially phosphates and arsenates of copper and zinc, form a group of phases with astonishing variability in crystal structures and chemical composition. Some of these minerals are more common than others and one has to ask whether the abundance is linked to their thermodynamic stability or rather to geochemical constraints. In this work, we used calorimetric techniques to determine the thermodynamic properties of synthetic olivenite [Cu2(AsO4)(OH)], zincolivenite [Cu0.95Zn1.05(AsO4)(OH)], adamite [Zn2(AsO4)(OH)], ludjibaite [Cu5(PO4)2(OH)4], natural strashimirite [(Cu7.75Zn0.09)7.84(AsO4)3.89(SO4)0.11(OH)3.79 center dot 5H2O], and a slavkovite sample dehydrated to the composition Cu12(AsO4)4(AsO3OH)6 center dot 14H2O that is used as a proxy for slavkovite. All thermodynamic data presented are based upon the compositions given above. The enthalpies of formation (at 298.15 K and 1 bar, all in kJ center dot mol-1) are -1401.7 +/- 2.6 (adamite), -1211.6 +/- 3.2 (zincolivenite), -3214.3 +/- 10.7 (ludjibaite), -5374.9 +/- 18.1 (strashimirite), and -12004 +/- 34 (dehydrated slavkovite). Entropy was measured only for ludjibaite (389.0 +/- 2.7 J center dot K-1 center dot mol-1) and estimated for other phases. Gibbs free energies of formation (all in kJ center dot mol-1) were calculated for ludjibaite (-2811.4 +/- 10.7), strashimirite (-4477.0 +/- 18.3), and dehydrated slavkovite (-9987 +/- 35). The dehydrated slavkovite is the consequence of H2O loss from the slavkovite holotype specimens during storage of the samples in air at room temperature. It is triclinic (P1 over bar ), with unit-cell parameters a = 6.4042(11) angstrom, b = 13.495 (2) angstrom, c = 13.574 (2) angstrom, alpha = 87.009(15)degrees, beta = 85.564(14)degrees, gamma = 79.678(15)degrees. Dehydration of slavkovite results in a collapse of the sheet structure into a framework structure and into reorganization of bonding, including protonation/deprotonation of AsO4 groups. Constructed activity-activity phase diagrams show that the less stable phases are those which are less common in nature, such as euchroite, strashimirite, or slavkovite. Zincolivenite is stabilized with respect to the end-members olivenite and adamite by a small enthalpy difference of -1.95 kJ center dot mol-1. Ludjibaite is metastable with respect to its polymorph pseudomalachite. Slavkovite is probably restricted to local acidic environments, rich in Cu and As. LA - English DB - MTMT ER - TY - JOUR AU - Rapprich, V. AU - Janousek, V. AU - Hroch, T. AU - Mikova, J. AU - Erban, V. AU - Legesa, F. AU - Pécskay, Zoltán AU - Halodova, P. TI - Eruptive and magmatic evolution of North Chamo Volcanic Field (southern Ethiopia) JF - JOURNAL OF GEOSCIENCES J2 - J GEOSCI VL - 68 PY - 2023 IS - 1 SP - 3 EP - 24 PG - 22 SN - 1802-6222 DO - 10.3190/jgeosci.365 UR - https://m2.mtmt.hu/api/publication/33672504 ID - 33672504 N1 - Czech Geological Survey, Klárov 3, Prague 1118 21, Czech Republic Geological Survey of Ethiopia, Gurd Shola, P.O. Box 2302, Addis Ababa, Ethiopia Isotope Climatology & Environmental Research Centre (Icer) K–Ar Group, Institute for Nuclear Research (ATOMKI), Bem tér 18/c, Debrecen, 4026, Hungary Export Date: 1 January 2024 Correspondence Address: Rapprich, V.; Czech Geological Survey, Klárov 3, Prague 1, Czech Republic; email: vladislav.rapprich@geology.cz AB - A group of pyroclastic cones is dispersed in the North Chamo Volcanic Field, i.e. in the northern surroundings of the Chamo Lake and over neighbouring part of the Nech Sar plains (southern termination of the Main Ethiopian Rift). The activity of scattered cinder cones was partly coeval with that of Tosa Sucha Volcano (Calabrian), but continued also after Tosa Sucha’s extinction until Middle Pleistocene (c. 0.5 Ma). Whereas scoria cones on the Nech Sar plains displayed a rather simple Strombolian eruptive style, the cones located within the northern part of Chamo Lake were characterized by more complex evolution. Ganjulle scoria cone, with a uniform olivine basalt composition, started with a Surtseyan-style eruption, which turned into Strombolian as the volcano grew above the water level. An even more complex history was documented for the Ganta cone. Compositional zoning of pyroclastic rocks is explained by zoned-chamber exhaustion. The transition from magmatic to phreatomagmatic style of the eruption was then most likely linked to syn-eruptive subsidence of the area on the Chamo Lake banks. Subsequent transition back to Strombolian style reflected the growth of the cone above water level.The Sr-Nd-Pb isotopes, together with major-element-based thermodynamic modelling, demonstrate that magmas parental to the North Chamo alkaline volcanic rocks (alkali basalt, through trachybasalt and trachyandesite to trachyte) evolved initially by closed-system fractionation of olivine, later joined by clinopyroxene, spinel and calcic plagioclase. The subsequent stage was characterized by a substantial (c. 25% by mass) assimilation of country-rock felsic igneous material, perhaps corresponding to the Paleogene ignimbrites. LA - English DB - MTMT ER - TY - JOUR AU - Korkmaz, GG AU - Kurt, H. AU - Asan, K AU - Petrelli, M. AU - Leybourne, M. TI - The role of peridotite and pyroxenite melts in the origin of the Karapınar basalts, Cappadocia Volcanic Province, Central Anatolia JF - JOURNAL OF GEOSCIENCES J2 - J GEOSCI VL - 67 PY - 2022 IS - 4 SP - 297 EP - 315 PG - 19 SN - 1802-6222 DO - 10.3190/jgeosci.362 UR - https://m2.mtmt.hu/api/publication/33580948 ID - 33580948 N1 - Funding Agency and Grant Number: Tubitak Caydag project [118Y252]; Selcuk University Bap project [17401117] Funding text: This study was financially supported by Tubitak Caydag project number 118Y252 and Selcuk University Bap project number 17401117. We thank Professor Yusuf Kagan Kadioglu, Dr. Kiymet Deniz, and Yebim for preparing the samples and realizing XRF and EPM analyses. The authors are deeply grateful to the handling editor Dr. Filip Tomek, and Assoc. Prof. Fatih Karaoglan, as well as Assoc. Prof. Lukas Ackerman for their critical and constructive comments that improved the quality of this paper. We are thankful to Dr. Gonenc Gocmengil for his valuable comments. LA - English DB - MTMT ER - TY - JOUR AU - Kochergina, Yulia V. Erban AU - Erban, Vojtech AU - Hora, John M. TI - Sample preparation and chromatographic separation for Sr, Nd , and Pb isotope analysis in geological, environmental, and archaeological samples JF - JOURNAL OF GEOSCIENCES J2 - J GEOSCI VL - 67 PY - 2022 IS - 3 SP - 259 EP - 271 PG - 13 SN - 1802-6222 DO - 10.3190/jgeosci.357 UR - https://m2.mtmt.hu/api/publication/33933856 ID - 33933856 AB - In countless modern geochemical studies, diverse biological and geologic samples are analyzed for Sr, Nd, and Pb isotopic composition. Such heterogeneity presents challenges for a "one-size-fits-all" approach to sample preparation, necessitating customization of sample preparation and chromatographic separation methods. We present (1) digestion techniques for low-Nd silicates, carbonatites, carbonates, water, plant and wood material, organic soils, aerosols collected via filtration, as well as archaeological samples (alloys, teeth, and bones) (2) a column chromatographic approach for samples with low concentrations (large amounts of a matrix) and (3) method verification via replicate analyses of a wide variety of isotopic standards. LA - English DB - MTMT ER - TY - JOUR AU - Jakubová, P. AU - Kotková, J. AU - Wirth, R. AU - Škoda, R. AU - Haifler, J. TI - Morphology and Raman spectral parameters of Bohemian microdiamonds: implications to elastic geothermobarometry JF - JOURNAL OF GEOSCIENCES J2 - J GEOSCI VL - 67 PY - 2022 IS - 3 SP - 239 EP - 257 PG - 19 SN - 1802-6222 DO - 10.3190/jgeosci.356 UR - https://m2.mtmt.hu/api/publication/33423256 ID - 33423256 LA - English DB - MTMT ER - TY - JOUR AU - Slack, John F. TI - Perspectives on premetamorphic stratabound tourmalinites JF - JOURNAL OF GEOSCIENCES J2 - J GEOSCI VL - 67 PY - 2022 IS - 2 SP - 73 EP - 102 PG - 30 SN - 1802-6222 DO - 10.3190/jgeosci.349 UR - https://m2.mtmt.hu/api/publication/33367613 ID - 33367613 N1 - U.S. Geological Survey (Emeritus), National Center, MS 954, Reston, VA 20192, United States Department of Earth Sciences, Memorial University of Newfoundland, St. John’s, NL A1B 3X5, Canada Export Date: 27 October 2023 Correspondence Address: Slack, J.F.; U.S. Geological Survey (Emeritus), MS 954, United States; email: jfslack@usgs.gov AB - Stratabound tourmalinites are metallogenically important rocks that locally show a close spatial association with diverse types of mineralization, especially volcanogenic massive sulfides (VMS) and clastic-dominated (CD) Zn-Pb deposits. These tourmalinite occurrences span the geologic record from Eoarchean to Jurassic. Host lithologies are dominated by clastic metasedimentary rocks but in some areas include metavolcanic rocks, marble, or metaevaporites. Stratabound and stratiform (conformable) tourmalinites commonly display sedimentary structures such as graded beds, cross-beds, and rip-up clasts. In most cases, field and microtextural relationships are consistent with a synsedimentary to early diagenetic introduction of boron as a precursor to tourmaline formation. Whole-rock geochemical data for major, trace, and rare earth elements (REE) provide valuable insights into tourmalinite origins. Al-normalized values relative to those for least-altered host metasedimentary rocks suggest that tourmalinites in proximal settings at or near hydrothermal vent sites characterized by high fluid/rock regimes (e.g., Sullivan Pb-Zn-Ag deposit, Canada) have very different signatures than those in low fluid/rock, distal settings (e.g., Broken Hill Pb-Zn-Ag deposit, Australia). The high fluid/rock regimes at Sullivan show large mass changes of +60 % for Mg and +180 % for Mn, as well as large variations in abundances of light and middle REE. In contrast, tourmalinite formation in low fluid/rock regimes yields minimal Al-normalized changes in major elements, trace elements, and REE. Boron isotope values of tourmalinite-hosted tourmaline vary widely from -26.1 to +27.5 parts per thousand, and are attributed mainly to boron sources (e.g., sediments, evaporites) with generally minor influence from processes such as formational temperature, fluid/rock ratio, and secular variation in seawater delta 11B values. Laterally extensive stratiform tourmalinites formed mainly by syngenetic or early diagenetic processes on or beneath the seafloor. The syngenetic process is attributed to the interaction of vented B-rich brines with aluminous minerals in sediments, whereas the diagenetic process involves the selective replacement of aluminous sediments by B-rich fluids. Modern examples of tourmalinites, as yet undiscovered, may exist in metalliferous sediments of the Red Sea and the eastern Pacific Ocean, in altered volcaniclastic sediments within active seafloor-hydrothermal systems of the South Pacific, and in hydrothermal mounds and vents associated with mafic sill complexes in extensional basins as in the North Sea and South China Sea. Stratabound tourmalinites that contain base-metal sulfides, high Mn concentra-tions (>1 wt. % MnO), or positive Eu anomalies can be valuable exploration guides for base-metal sulfide deposits in sedimentary and volcanic terranes. LA - English DB - MTMT ER - TY - JOUR AU - Gençoğlu Korkmaz, G. AU - Kurt, H. AU - Asan, K. AU - Leybourne, M. TI - Ar-Ar Geochronology and Sr-Nd-Pb-O Isotopic Systematics of the Post-collisional Volcanic Rocks from the Karapınar-Karacadağ Area (Central Anatolia, Turkey): An Alternative Model for Orogenic Geochemical Signature in Sodic Alkali Basalts JF - JOURNAL OF GEOSCIENCES J2 - J GEOSCI VL - 67 PY - 2022 IS - 1 SP - 53 EP - 69 PG - 17 SN - 1802-6222 DO - 10.3190/jgeosci.343 UR - https://m2.mtmt.hu/api/publication/32838577 ID - 32838577 LA - English DB - MTMT ER -