The recently rediscovered small D6e granitic pegmatite body, enclosed in amphibole gneiss of the Sobotín amfibolite massif (Jeseníky Mountains, Czech Republic), is characterized by numerous accessory minerals, including common columbite group minerals (CGM) and minor microlite and fersmite related to blocky K-feldspar unit. The CGM show complex internal zoning. Primary magmatic columbite-(Mn) occurs as corroded domains of prevailing homogeneous pattern, followed by less evolved oscillatory zonation. Primary CGM were overprinted by extensive recrystallization controlled by late-magmatic to post-magmatic fluids and leading to a formation of complex patchy and convolute oscillatory domains of secondary (hydrothermal) CGM. Primary columbite-(Mn) shows significantly limited Ta/(Ta+Nb) and Mn/(Mn+Fe) ratios, whereas secondary columbite-(Fe) to -(Mn) show slightly wider Fe-Mn and Nb-Ta compositional variations. Complex textures and the element fluctuations indicate a partial dissolution-reprecipitation of primary CGM caused by late- to post-magmatic fluids. Moreover, late calciomicrolite I, II and fersmite precipitated on the cracks of columbite crystals. Rare U-rich calciomicrolite I was extensively replaced by fersmite and oscillatorily zoned U-poor calciomicrolite II, slightly enriched in F. Their formation sequestrated part of hydrotermally released Na, Ca, U and represents the final subsolidus fluid-driven stage of the pegmatite evolution. Textural and compositional variations of Nb-Ta mineralization point to a complex magmatic to hydrothermal evolution of the D6e beryl-columbite pegmatite similar to other pegmatites in this region.
{"title":"Komplexní magmaticko-hydrotermální vývoj columbitu, mikrolitu a fersmitu z beryl-columbitového pegmatitu D6e u Maršíkova, Česká republika","authors":"Štěpán Chládek, P. Uher","doi":"10.46861/bmp.28.023","DOIUrl":"https://doi.org/10.46861/bmp.28.023","url":null,"abstract":"The recently rediscovered small D6e granitic pegmatite body, enclosed in amphibole gneiss of the Sobotín amfibolite massif (Jeseníky Mountains, Czech Republic), is characterized by numerous accessory minerals, including common columbite group minerals (CGM) and minor microlite and fersmite related to blocky K-feldspar unit. The CGM show complex internal zoning. Primary magmatic columbite-(Mn) occurs as corroded domains of prevailing homogeneous pattern, followed by less evolved oscillatory zonation. Primary CGM were overprinted by extensive recrystallization controlled by late-magmatic to post-magmatic fluids and leading to a formation of complex patchy and convolute oscillatory domains of secondary (hydrothermal) CGM. Primary columbite-(Mn) shows significantly limited Ta/(Ta+Nb) and Mn/(Mn+Fe) ratios, whereas secondary columbite-(Fe) to -(Mn) show slightly wider Fe-Mn and Nb-Ta compositional variations. Complex textures and the element fluctuations indicate a partial dissolution-reprecipitation of primary CGM caused by late- to post-magmatic fluids. Moreover, late calciomicrolite I, II and fersmite precipitated on the cracks of columbite crystals. Rare U-rich calciomicrolite I was extensively replaced by fersmite and oscillatorily zoned U-poor calciomicrolite II, slightly enriched in F. Their formation sequestrated part of hydrotermally released Na, Ca, U and represents the final subsolidus fluid-driven stage of the pegmatite evolution. Textural and compositional variations of Nb-Ta mineralization point to a complex magmatic to hydrothermal evolution of the D6e beryl-columbite pegmatite similar to other pegmatites in this region.","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70597707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Accessory minerals of columbite and microlite groups were identified in granitic pegmatite dike intruded into parental Carboniferous (~350 Ma) leucogranites of the crystalline basement of the Tatric Unit, Central Western Carpathians. The pegmatite is situated on E slope of Bystrý Hill near Liešťany village, the Strážovské vrchy Mts., Slovakia. Primary columbite-(Fe) forms euhedral crystal (~3 mm across) with diffuse internal zoning reflecting a relatively small compositional variations: Mn/(Mn + Fe) = 0.40 - 0.45 and Ta/(Ta + Nb) = 0.21 - 0.24. Secondary anhedral domains of Ta-rich columbite-(Fe) to tantalite-(Fe) (≤200 μm) with Mn/(Mn + Fe) = 0.45 - 0.47 and Ta/(Ta + Nb) = 0.45 - 0.62 partly replace primary columbite-(Fe) along crystal rims. Moreover, secondary subhedral crystals of microlite-group minerals (≤25 μm) form fracture fillings in columbite-(Fe). The microlites show uniform high Ta/(Ta + Nb) ratio (0.77 - 0.80) and U content (7.7 - 10.2 wt.% UO2; 0.18 - 0.21 U apfu) but different contents of F, Ca, Na and Pb: central parts locally show fluorcalciomicrolite composition (~2 wt.% F, ~9.5 wt.% CaO, 2.2 - 2.7 wt.% Na2O), whereas main microlite mass forms zero-valent-dominant microlite with inclusions (≤8 μm) of Pb-rich zero-valent-dominant microlite (16.8 - 19.7 wt.% PbO; 0.46 - 0.56 Pb apfu). Textural relationships and chemical compositions of Nb-Ta minerals indicate primary magmatic origin of columbite-(Fe) and post-magmatic (early subsolidus to late hydrothermal) formation of secondary Ta-rich columbite-(Fe) to tantalite-(Fe) and microlite-group minerals.
{"title":"Minerály skupiny columbitu a mikrolitu v granitovom pegmatite pri Liešťanoch: prvý výskyt vzácnoprvkovej Nb-Ta mineralizácie v Strážovských vrchoch (Slovenská republika)","authors":"Pavel Uher, Martin Števko, Sergii Kurylo","doi":"10.46861/bmp.28.347","DOIUrl":"https://doi.org/10.46861/bmp.28.347","url":null,"abstract":"Accessory minerals of columbite and microlite groups were identified in granitic pegmatite dike intruded into parental Carboniferous (~350 Ma) leucogranites of the crystalline basement of the Tatric Unit, Central Western Carpathians. The pegmatite is situated on E slope of Bystrý Hill near Liešťany village, the Strážovské vrchy Mts., Slovakia. Primary columbite-(Fe) forms euhedral crystal (~3 mm across) with diffuse internal zoning reflecting a relatively small compositional variations: Mn/(Mn + Fe) = 0.40 - 0.45 and Ta/(Ta + Nb) = 0.21 - 0.24. Secondary anhedral domains of Ta-rich columbite-(Fe) to tantalite-(Fe) (≤200 μm) with Mn/(Mn + Fe) = 0.45 - 0.47 and Ta/(Ta + Nb) = 0.45 - 0.62 partly replace primary columbite-(Fe) along crystal rims. Moreover, secondary subhedral crystals of microlite-group minerals (≤25 μm) form fracture fillings in columbite-(Fe). The microlites show uniform high Ta/(Ta + Nb) ratio (0.77 - 0.80) and U content (7.7 - 10.2 wt.% UO2; 0.18 - 0.21 U apfu) but different contents of F, Ca, Na and Pb: central parts locally show fluorcalciomicrolite composition (~2 wt.% F, ~9.5 wt.% CaO, 2.2 - 2.7 wt.% Na2O), whereas main microlite mass forms zero-valent-dominant microlite with inclusions (≤8 μm) of Pb-rich zero-valent-dominant microlite (16.8 - 19.7 wt.% PbO; 0.46 - 0.56 Pb apfu). Textural relationships and chemical compositions of Nb-Ta minerals indicate primary magmatic origin of columbite-(Fe) and post-magmatic (early subsolidus to late hydrothermal) formation of secondary Ta-rich columbite-(Fe) to tantalite-(Fe) and microlite-group minerals.","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70598059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A detailed panning prospection of the Řepovský potok, Míroveček and Ospitský potok creeks (northern part of the Zábřeh Upland) proved that trace amount of alluvial gold occurs in the whole studied area. The collected gold sheets are 0.2 to 3 mm in size and mostly have shapes only weakly modified by transport in the stream. Although the chemical composition varies widely between Au-rich silver and pure gold (28.1 - 99.8 at. % Au), individual sheets are typically (few exceptions exist) compositionally homogeneous. Less than half of them has the narrow high-fineness rim, which was formed by leaching of silver in supergene conditions. In lower reach of the Řepovský potok creek there were also found gold sheets containing elevated mercury (0.1 - 5.1 at. %), which most probably originated from neighbouring vein-type Ag-Zn-Pb deposit Řepová. In contrast, the source of Hg-free gold sheets was not unambiguously established. The first possibility includes small vein-type mineralizations similar to the Řepová ore deposit and containing trace amount of gold (an occurrence of this type was newly recognized in the vicinity of Dlouhá Ves village). Second, one cannot exclude the trace occurrence of gold sheets directly in underlying metasiltstones or acid metavolcanic rocks of the Zábřeh Crystalline Complex [with respect to repeatedly observed intergrowths of gold with polymineral aggregates of phyllosilicates (muscovite, chlorite, biotite, clay minerals), feldspars (K-feldspar, albite, K-Na feldspar) and minor quartz in the alluvial gold sheets]. The particles of metallic Cu-Zn-Sn alloys with admixture of Ni, Sb and In, panned from the Řepovský potok creek, could contain metals originated from smelting of polymetallic ores from the deposit Řepová, which comprise the same minor elements.
{"title":"Aluviální zlato v oblasti Dlouhá Ves - Řepová (zábřežské krystalinikum)","authors":"Z. Dolníček, Miroslav Nepejchal, Jana Ulmanová","doi":"10.46861/bmp.28.009","DOIUrl":"https://doi.org/10.46861/bmp.28.009","url":null,"abstract":"A detailed panning prospection of the Řepovský potok, Míroveček and Ospitský potok creeks (northern part of the Zábřeh Upland) proved that trace amount of alluvial gold occurs in the whole studied area. The collected gold sheets are 0.2 to 3 mm in size and mostly have shapes only weakly modified by transport in the stream. Although the chemical composition varies widely between Au-rich silver and pure gold (28.1 - 99.8 at. % Au), individual sheets are typically (few exceptions exist) compositionally homogeneous. Less than half of them has the narrow high-fineness rim, which was formed by leaching of silver in supergene conditions. In lower reach of the Řepovský potok creek there were also found gold sheets containing elevated mercury (0.1 - 5.1 at. %), which most probably originated from neighbouring vein-type Ag-Zn-Pb deposit Řepová. In contrast, the source of Hg-free gold sheets was not unambiguously established. The first possibility includes small vein-type mineralizations similar to the Řepová ore deposit and containing trace amount of gold (an occurrence of this type was newly recognized in the vicinity of Dlouhá Ves village). Second, one cannot exclude the trace occurrence of gold sheets directly in underlying metasiltstones or acid metavolcanic rocks of the Zábřeh Crystalline Complex [with respect to repeatedly observed intergrowths of gold with polymineral aggregates of phyllosilicates (muscovite, chlorite, biotite, clay minerals), feldspars (K-feldspar, albite, K-Na feldspar) and minor quartz in the alluvial gold sheets]. The particles of metallic Cu-Zn-Sn alloys with admixture of Ni, Sb and In, panned from the Řepovský potok creek, could contain metals originated from smelting of polymetallic ores from the deposit Řepová, which comprise the same minor elements.","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70597518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A new occurrence of axinite at the locality Jezuitský rybník near Sirákovice (ENE from Golčův Jeníkov), situated in rocks of the Variegated (Drosendorf) Series (Moldanubian Zone of the Bohemian Massif), is a nice example of contaminated pegmatite in a Ca-skarn with intense superimposed hydrothermal overprint. Axinite [axinite-(Fe) to axinite-(Mg)] forms young hydrothermal infill of pocket/fissure in pegmatite cutting a brecciated Ca-skarn. The hydrothermal assemblage includes amphibole II (actinolite to ferro-actinolite), albite, K-feldspar II, chlorite, epidote (locally containing 0.20 - 0.30 apfu REE), muscovite and Al,F-enriched titanite (with up to 2 % SnO2) passing exceptionally to unnamed CaAlFSiO4. Quartz, plagioclase (andesine), K-feldspar I and amphibole I (mostly K-rich or even potassian ferro-pargasite to ferro-tschermakite) originated in magmatic stage associated with intrusion of externally derived pegmatite melt. Sporadic garnet (grossular-rich almandine) represents relics of mineral assemblage of the host skarn. Dominance of Nd among REE in the REE-rich epidote is explained in terms of chemical fractionation of REE, probably caused by the presence of strong REE-complexing ligands (F-, OH- and/or CO32-) in aqueous fluids enriched in MREE/HREE due to alteration of garnet. With regard to the presence of B, Cr and elevated XMg in some hydrothermal phases compared to the older Fe-Mg minerals, we suggest circulation of fluids affecting host rocks as well as additional rock types.
{"title":"Axinit a doprovodné minerály z lokality Jezuitský rybník východně od Golčova Jeníkova (moldanubikum, Česká republika)","authors":"Z. Dolníček, Michal Kovář, Jana Ulmanová","doi":"10.46861/bmp.28.437","DOIUrl":"https://doi.org/10.46861/bmp.28.437","url":null,"abstract":"A new occurrence of axinite at the locality Jezuitský rybník near Sirákovice (ENE from Golčův Jeníkov), situated in rocks of the Variegated (Drosendorf) Series (Moldanubian Zone of the Bohemian Massif), is a nice example of contaminated pegmatite in a Ca-skarn with intense superimposed hydrothermal overprint. Axinite [axinite-(Fe) to axinite-(Mg)] forms young hydrothermal infill of pocket/fissure in pegmatite cutting a brecciated Ca-skarn. The hydrothermal assemblage includes amphibole II (actinolite to ferro-actinolite), albite, K-feldspar II, chlorite, epidote (locally containing 0.20 - 0.30 apfu REE), muscovite and Al,F-enriched titanite (with up to 2 % SnO2) passing exceptionally to unnamed CaAlFSiO4. Quartz, plagioclase (andesine), K-feldspar I and amphibole I (mostly K-rich or even potassian ferro-pargasite to ferro-tschermakite) originated in magmatic stage associated with intrusion of externally derived pegmatite melt. Sporadic garnet (grossular-rich almandine) represents relics of mineral assemblage of the host skarn. Dominance of Nd among REE in the REE-rich epidote is explained in terms of chemical fractionation of REE, probably caused by the presence of strong REE-complexing ligands (F-, OH- and/or CO32-) in aqueous fluids enriched in MREE/HREE due to alteration of garnet. With regard to the presence of B, Cr and elevated XMg in some hydrothermal phases compared to the older Fe-Mg minerals, we suggest circulation of fluids affecting host rocks as well as additional rock types.","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70598225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Peter Ružička, Peter Bačík, Pavol Myšľan, Sergii Kurylo
The identified mineral association in the crystalline limestones from the manganese locality Čučma - Čierna baňa consists of garnets and pyroxenes. Mineralogical composition of the samples Ču-1 and Ču-2 is represented by zonal garnets with Grs76.12-82.31; Adr17.69-23.88 composition in the core and Grs95.48-97.05; Adr2.95-4.52 composition in the rim. In the sample Ču-3 inverse zonality (the core Adr3.99, Grs96.01; the rim Adr20.55, Grs79.45) of garnet is observable. The analyzed pyroxenes have a diopside composition with a variable Mg/(Mg+Fe2+) ratio. A slightly increased content of Mn (up to 0.09 apfu) ascends into the johannsenite molecule.
{"title":"Grosulár a diopsid v kryštalických vápencoch z lokality Čučma - Čierna baňa (Slovenská republika)","authors":"Peter Ružička, Peter Bačík, Pavol Myšľan, Sergii Kurylo","doi":"10.46861/bmp.28.094","DOIUrl":"https://doi.org/10.46861/bmp.28.094","url":null,"abstract":"The identified mineral association in the crystalline limestones from the manganese locality Čučma - Čierna baňa consists of garnets and pyroxenes. Mineralogical composition of the samples Ču-1 and Ču-2 is represented by zonal garnets with Grs76.12-82.31; Adr17.69-23.88 composition in the core and Grs95.48-97.05; Adr2.95-4.52 composition in the rim. In the sample Ču-3 inverse zonality (the core Adr3.99, Grs96.01; the rim Adr20.55, Grs79.45) of garnet is observable. The analyzed pyroxenes have a diopside composition with a variable Mg/(Mg+Fe2+) ratio. A slightly increased content of Mn (up to 0.09 apfu) ascends into the johannsenite molecule.","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70597721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Illite-rich size-fractions (<0.2, <0.4, 0.4-1, 0.4-2 and <2 µm) of Cambrian, Permian, Triassic and Jurassic calcschists, shales and dolostones from Pb-Zn ore-district of the southeastern French Massif Central were dated by the K-Ar method, and some by the Pb-Pb method after removal of the Pb external to the illite particles. The combined mineralogical and isotopic determinations show that illitization occurred successively at 285 ± 5, 240 ± 20, 185 ± 15, 140 ± 10 and 105 ± 5 Ma in the district. These tectonic-thermal pulses, which were also reported at a larger regional scale, did not systematically release Pb-mineralizing fluids. The mineralizing episodes seem to have only contributed to contemporaneous illitization and Pb precipitation at 191 ± 41 Ma, by Pb-Pb dating of illite, and at 105 ± 5 Ma in a reactivated fault containing illite mixed with Pb precipitates. The scatter of the Pb-Pb data suggests an incompletely equilibrated Pb isotopic signature when incorporated into the illite structure during crystallization. Pb-isotopic determinations of barren illite-type minerals provide new information about the circulation timing of the mineralizing hydrothermal fluids. The fluid migrations related to recurrent hydrothermal activities occurred within a segment of a continental margin that was located away from main rift zones and far (more than 500 km) from major orogenic zones of Western Europe. The lack of major geodynamic activities near metal deposits needs to hypothesize periodic migrations of hot -fluids in the underneath continental crust. Metals were concentrated at specific places, but not necessarily during each tectonic-thermal pulse recorded by illite. These tectonic-thermal activities confirm local geodynamic re-activations of previously occurring events with effects on local mass and heat transfers in the plutonic basements, as well as in the sedimentary sequences.
{"title":"Tectonic-thermal constraints on the Pb-Zn ore deposits from southeastern French Central Massif by K-Ar and Pb-Pb dating of illite","authors":"T. Toulkeridis, N. Liewig","doi":"10.46861/bmp.28.307","DOIUrl":"https://doi.org/10.46861/bmp.28.307","url":null,"abstract":"Illite-rich size-fractions (<0.2, <0.4, 0.4-1, 0.4-2 and <2 µm) of Cambrian, Permian, Triassic and Jurassic calcschists, shales and dolostones from Pb-Zn ore-district of the southeastern French Massif Central were dated by the K-Ar method, and some by the Pb-Pb method after removal of the Pb external to the illite particles. The combined mineralogical and isotopic determinations show that illitization occurred successively at 285 ± 5, 240 ± 20, 185 ± 15, 140 ± 10 and 105 ± 5 Ma in the district. These tectonic-thermal pulses, which were also reported at a larger regional scale, did not systematically release Pb-mineralizing fluids. The mineralizing episodes seem to have only contributed to contemporaneous illitization and Pb precipitation at 191 ± 41 Ma, by Pb-Pb dating of illite, and at 105 ± 5 Ma in a reactivated fault containing illite mixed with Pb precipitates. The scatter of the Pb-Pb data suggests an incompletely equilibrated Pb isotopic signature when incorporated into the illite structure during crystallization. Pb-isotopic determinations of barren illite-type minerals provide new information about the circulation timing of the mineralizing hydrothermal fluids. The fluid migrations related to recurrent hydrothermal activities occurred within a segment of a continental margin that was located away from main rift zones and far (more than 500 km) from major orogenic zones of Western Europe. The lack of major geodynamic activities near metal deposits needs to hypothesize periodic migrations of hot -fluids in the underneath continental crust. Metals were concentrated at specific places, but not necessarily during each tectonic-thermal pulse recorded by illite. These tectonic-thermal activities confirm local geodynamic re-activations of previously occurring events with effects on local mass and heat transfers in the plutonic basements, as well as in the sedimentary sequences.","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70597934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Štefan Ferenc, Tomáš Mikuš, Ján Spišiak, Richard Kopáčik, Eva Hoppanová
Historical uranium ore deposit Kravany is located in the eastern part of Kozie Chrbty Mts., approximately 9 km SW of the district town Poprad. Stratiform, infiltration U-Cu-Pb mineralization is bound to the Upper Permian clastic sediments (Kravany Beds, member of Malužiná Formation, Hronicum Unit), which are enriched in fragments of carbonized flora. Vein U-Mo-Cu mineralization was found in the Upper Permian intermediate to basic volcanics intersecting the sediments of the Kravany Beds (also ore lenses). Vein filling originated in the following development stages: I.) Quartz-pyrite (quartz, pyrite, marcasite), II.) Dolomite-pyrite (dolomite, pyrite, marcasite, galena), III.) Copper (tetrahedrite, tennantite, chalcopyrite), IV.) Uranium-molybdenum (uraninite, Pb-Mo-S phase, coffinite, quartz), and V.) Calcite (calcite, chalcopyrite). The formation of mineralization can be explained by the geological position: random emplacement of the diorite porphyrite, resp. basalt-andesite dikes, directly in the preexisting U,Mo-bearing sediments. Vein U-Mo-Cu mineralization could thus most likely have formed according to the following scenario: I.) sedimentation of Kravany Beds in the Permian riftogenic basin: formation of beds of arkoses and arkosic sandstones with abundant fragments of charred flora, II.) formation of infiltration U mineralization: reduction and accumulation of U in sediments rich in organic matter, III.) emplacement of dikes of intermediate to basic volcanics: intersection of sediments with organics and with high U and Mo content, mobilization of formation fluids, assimilation of U and Mo into intermediate-basic magma, IV.) cooling of volcanic bodies → their contraction (formation of contraction cracks) → filling of contraction cracks with quartz, carbonates and ore minerals (crystallization from residual magmatic solutions mixed with formation waters). From this point of view it is syngenetic volcanogenic vein U-Mo-Cu mineralization, originally of the Permian age, with subsequent Alpine (most probably Cretaceous) reworking (this is evidenced by the variable composition of uraninite). It belongs to the Neohercynian late- to postorogenic metallogenetic stage. The possible younger, post-Permian age of mineralization from alpine hydrothermal solutions must also be assumed, but this consideration has several inconsistencies.
历史悠久的铀矿床Kravany位于Kozie Chrbty Mts.东部，位于Poprad镇西南约9公里处。层状、浸润型U-Cu-Pb成矿作用与上二叠统碎屑沉积物(Hronicum单元Malužiná组Kravany层)相结合，富集炭化植物群片段。在上二叠统中基性火山岩中发现脉状U-Mo-Cu矿化，与克拉瓦尼层(也称矿石透镜体)的沉积物相交。静脉充盈起源于以下几个发展阶段:石英-黄铁矿(石英、黄铁矿、黄铁矿)白云石-黄铁矿(白云石、黄铁矿、黄铁矿、方铅矿)，III.)铜(四面体，tennantite，黄铜矿)，IV.)铀钼(铀矿，Pb-Mo-S相，coffinite，石英)，和V.)方解石(方解石、黄铜矿)。成矿作用的形成可以用地质位置来解释:闪长斑岩等的随机侵位。玄武岩-安山岩岩脉，直接存在于先前存在的含U、mo的沉积物中。脉状U- mo - cu矿化很可能是在以下情况下形成的:1)二叠系裂陷盆地克拉瓦尼床的沉积作用:含大量焦化植物群碎片的粗砂岩和粗砂岩床的形成;2)浸润型U矿化作用的形成:富有机质沉积物中U的还原和富集;3)中基性火山岩岩脉的侵位作用。沉积物与有机物和高U、Mo含量的交汇，地层流体的动员，U、Mo向中基性岩浆的同化，IV.)火山岩降温→收缩(形成收缩裂缝)→石英、碳酸盐和矿石矿物填充收缩裂缝(与地层水混合的残余岩浆溶液结晶)。从这个角度来看，它是同生的火山脉状U-Mo-Cu矿化，最初是在二叠纪，后来被高山(很可能是白垩纪)改造(这一点可以从铀矿的变化成分中得到证明)。属于新海西期晚-后成矿阶段。也必须假设高山热液溶液的矿化可能更年轻，在二叠纪之后，但这种考虑有几个不一致之处。
{"title":"Kremeňovo-karbonátové žily s U-Mo-Cu mineralizáciou v permských intermediárnych až bázických vulkanitoch hronika na lokalite Kravany (Kozie chrbty, východné Slovensko)","authors":"Štefan Ferenc, Tomáš Mikuš, Ján Spišiak, Richard Kopáčik, Eva Hoppanová","doi":"10.46861/bmp.28.364","DOIUrl":"https://doi.org/10.46861/bmp.28.364","url":null,"abstract":"Historical uranium ore deposit Kravany is located in the eastern part of Kozie Chrbty Mts., approximately 9 km SW of the district town Poprad. Stratiform, infiltration U-Cu-Pb mineralization is bound to the Upper Permian clastic sediments (Kravany Beds, member of Malužiná Formation, Hronicum Unit), which are enriched in fragments of carbonized flora. Vein U-Mo-Cu mineralization was found in the Upper Permian intermediate to basic volcanics intersecting the sediments of the Kravany Beds (also ore lenses). Vein filling originated in the following development stages: I.) Quartz-pyrite (quartz, pyrite, marcasite), II.) Dolomite-pyrite (dolomite, pyrite, marcasite, galena), III.) Copper (tetrahedrite, tennantite, chalcopyrite), IV.) Uranium-molybdenum (uraninite, Pb-Mo-S phase, coffinite, quartz), and V.) Calcite (calcite, chalcopyrite). The formation of mineralization can be explained by the geological position: random emplacement of the diorite porphyrite, resp. basalt-andesite dikes, directly in the preexisting U,Mo-bearing sediments. Vein U-Mo-Cu mineralization could thus most likely have formed according to the following scenario: I.) sedimentation of Kravany Beds in the Permian riftogenic basin: formation of beds of arkoses and arkosic sandstones with abundant fragments of charred flora, II.) formation of infiltration U mineralization: reduction and accumulation of U in sediments rich in organic matter, III.) emplacement of dikes of intermediate to basic volcanics: intersection of sediments with organics and with high U and Mo content, mobilization of formation fluids, assimilation of U and Mo into intermediate-basic magma, IV.) cooling of volcanic bodies → their contraction (formation of contraction cracks) → filling of contraction cracks with quartz, carbonates and ore minerals (crystallization from residual magmatic solutions mixed with formation waters). From this point of view it is syngenetic volcanogenic vein U-Mo-Cu mineralization, originally of the Permian age, with subsequent Alpine (most probably Cretaceous) reworking (this is evidenced by the variable composition of uraninite). It belongs to the Neohercynian late- to postorogenic metallogenetic stage. The possible younger, post-Permian age of mineralization from alpine hydrothermal solutions must also be assumed, but this consideration has several inconsistencies.","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70598094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A new occurrence of pseudomalachite was recently discovered at the Zadné Breziny copper occurrence near Gemerská Poloma, Rožňava Co., Košice Region, Slovakia. It forms dark green rich coatings and crusts, which consist of individual hemispherical aggregates up to 7 mm in size. Pseudostalactites up to 6 mm in size were also rarely observed. Pseudomalachite occurs in fractures and cavities of the quartz gangue or in fractures of the wall rock. It is associated with malachite, cuprite and native copper. The refined unit-cell parameters (for the monoclinic space group P21/c) are a 4.4805(5) Å, b 5.7504(6) Å, c 17.045(2) Å, β 91.12(1)° and V 439.06(6) Å3. Except of dominant contents of Cu and P only minor amounts of Al (up to 0.04 apfu), Fe (up to 0.02 apfu), As (up to 0.07 apfu) and S (up to 0.01 apfu) were detected in studied samples of pseudomalachite from the Zadné Breziny occurrence.
{"title":"Pseudomalachit z lokality Zadné Breziny pri Gemerskej Polome (Slovenská republika)","authors":"Martin Števko, Jiří Sejkora, Zdeněk Dolníček","doi":"10.46861/bmp.28.290","DOIUrl":"https://doi.org/10.46861/bmp.28.290","url":null,"abstract":"A new occurrence of pseudomalachite was recently discovered at the Zadné Breziny copper occurrence near Gemerská Poloma, Rožňava Co., Košice Region, Slovakia. It forms dark green rich coatings and crusts, which consist of individual hemispherical aggregates up to 7 mm in size. Pseudostalactites up to 6 mm in size were also rarely observed. Pseudomalachite occurs in fractures and cavities of the quartz gangue or in fractures of the wall rock. It is associated with malachite, cuprite and native copper. The refined unit-cell parameters (for the monoclinic space group P21/c) are a 4.4805(5) Å, b 5.7504(6) Å, c 17.045(2) Å, β 91.12(1)° and V 439.06(6) Å3. Except of dominant contents of Cu and P only minor amounts of Al (up to 0.04 apfu), Fe (up to 0.02 apfu), As (up to 0.07 apfu) and S (up to 0.01 apfu) were detected in studied samples of pseudomalachite from the Zadné Breziny occurrence.","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70598143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ore mineralization in small Sb-Au occurrences Lomnistá, Husárka and Suchá dolina (Nízke Tatry Mts., Western Carpathians) was investigated by reflected-light microscopy, electron microprobe, fluid inclusion measurements, identification of host rock alteration and secondary minerals. Hydrothermal Sb-Au mineralization was formed during the arsenopyrite-pyrite-gold and stibnite-Pb-Sb-sulfosalts stages. The first stage of mineralization consists of arsenopyrite, pyrite, and quartz, but gold, typical for this stage in the Nízke Tatry Mts. is missing. Stibnite and zinkenite are dominant in the following stage in Lomnistá and Husárka. Berthierite and jamesonite are frequent in Suchá dolina. Other ore minerals identified here are sphalerite, chalcostibite, chalcopyrite, cinnabar, tetrahedrite-(Hg) at Lomnistá and Husárka and pyrrhotite, chalcostibite, tetrahedrite-(Fe), chalcopyrite, antimony, and gold in Suchá dolina. Identified secondary minerals are valentinite and stibiconite. Stibnite, gold, and other ore minerals were found in heavy-mineral fractions from alluvial sediments, pointing at short transport from the primary sources. Two quartz samples, thought to be related to stibnite or berthierite, contained two-phase fluid inclusions with salinity of 10 - 20 wt.% NaCl eq. The total homogenization temperatures are 230 - 330 ºC in Lomnistá and 200 - 260 ºC in Suchá dolina.
利用反射光显微镜、电子探针、流体包裹体测量、主岩蚀变及次生矿物鉴定等方法，研究了lomnist、Husárka和such dolina (Nízke Tatry Mts，西喀尔巴阡山脉)小型Sb-Au矿床的成矿作用。毒砂—黄铁矿—金和辉锑矿—铅—锑—硫酸盐阶段形成热液成矿。第一阶段的矿化由毒砂、黄铁矿和石英组成，但在Nízke Tatry mts中缺少该阶段典型的金。lomnist和Husárka的下一阶段以辉锑矿和锌锑矿为主。伯提锡石和雅各辉石在这类白云岩中很常见。在这里发现的其他矿石矿物有闪锌矿、辉铜矿、黄铜矿、朱砂、lomnist和Husárka的四面体(汞)和suchaldolina的磁黄铁矿、辉铜矿、四面体(铁)、黄铜矿、锑和金。鉴定出的次生矿物有华伦铅矿和辉锑矿。在冲积沉积物的重矿物组分中发现了辉锑矿、金和其他矿石矿物，这表明它们是从原生源短暂迁移而来的。两个石英样品被认为与辉锑矿或绢黄铁矿有关，含有两相流体包裹体，盐度为10 ~ 20 wt.% NaCl eq。lomnist的总均一温度为230 ~ 330ºC, such dolina的总均一温度为200 ~ 260ºC。
{"title":"Výskyty hydrotermálnej Sb-Au mineralizácie na lokalitách Lomnistá, Husárka a Suchá dolina pri Jasení (Nízke Tatry)","authors":"Štefan Čík, Martin Chovan, Juraj Majzlan","doi":"10.46861/bmp.28.210","DOIUrl":"https://doi.org/10.46861/bmp.28.210","url":null,"abstract":"Ore mineralization in small Sb-Au occurrences Lomnistá, Husárka and Suchá dolina (Nízke Tatry Mts., Western Carpathians) was investigated by reflected-light microscopy, electron microprobe, fluid inclusion measurements, identification of host rock alteration and secondary minerals. Hydrothermal Sb-Au mineralization was formed during the arsenopyrite-pyrite-gold and stibnite-Pb-Sb-sulfosalts stages. The first stage of mineralization consists of arsenopyrite, pyrite, and quartz, but gold, typical for this stage in the Nízke Tatry Mts. is missing. Stibnite and zinkenite are dominant in the following stage in Lomnistá and Husárka. Berthierite and jamesonite are frequent in Suchá dolina. Other ore minerals identified here are sphalerite, chalcostibite, chalcopyrite, cinnabar, tetrahedrite-(Hg) at Lomnistá and Husárka and pyrrhotite, chalcostibite, tetrahedrite-(Fe), chalcopyrite, antimony, and gold in Suchá dolina. Identified secondary minerals are valentinite and stibiconite. Stibnite, gold, and other ore minerals were found in heavy-mineral fractions from alluvial sediments, pointing at short transport from the primary sources. Two quartz samples, thought to be related to stibnite or berthierite, contained two-phase fluid inclusions with salinity of 10 - 20 wt.% NaCl eq. The total homogenization temperatures are 230 - 330 ºC in Lomnistá and 200 - 260 ºC in Suchá dolina.","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70597761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
An interesting association of Sb-enriched Ni arsenides and sulfarsenides was recently discovered in the carbonate-quartz (siderite type) hydrothermal vein in the Karol adit, at the Zemberg-Terézia vein system near Dobšiná, Slovak Republic. It is represented by nickeline and gersdorffite as main ore minerals accompanied by rammelsbergite, ullmannite, millerite, tetrahedrite-(Zn), chalcopyrite and bornite. The two distinct compositional types of nickeline are present, the Sb-poor (with up to 0.03 apfu of Sb) and Sb-rich variety (with up to 0.12 apfu of Sb). Gersdorffite is mostly replacing nickeline as rims or it forms aggregates, rims around or veinlets in tetrahedrite-(Zn). The three compositionally different types of gersdorffite are present: Sb-rich (with Sb reaching up to 0.31 apfu) and variable Ni/Co/Fe ratio, As-rich gersdorffite (with up to 1.32 apfu of As) also containing minor Co and Fe and the last one is Fe-rich gersdorffite (with up to 0.24 apfu) and nearly ideal As/S ratio. Rammelsbergite, ullmannite and millerite occur as abundant, microscopic inclusions in nickeline and gersdorffite. In tetrahedrite-(Zn), Zn (up to 1.52 apfu) is dominant over (Fe up to 0.82, Ni up to 0.12, Hg up to 0.04 and Pb up to 0.01 apfu) and Sb is considerably prevailing (2.96 - 4.01 apfu) over As (0.02 - 1.02 apfu). Both chalcopyrite and bornite were observed as inclusions in tetrahedrite-(Zn).
{"title":"Sb-enriched association of Ni arsenides and sulfarsenides from the Zemberg-Terézia vein system near Dobšiná (Western Carpathians, Slovak Republic)","authors":"M. Števko, J. Sejkora","doi":"10.46861/bmp.28.105","DOIUrl":"https://doi.org/10.46861/bmp.28.105","url":null,"abstract":"An interesting association of Sb-enriched Ni arsenides and sulfarsenides was recently discovered in the carbonate-quartz (siderite type) hydrothermal vein in the Karol adit, at the Zemberg-Terézia vein system near Dobšiná, Slovak Republic. It is represented by nickeline and gersdorffite as main ore minerals accompanied by rammelsbergite, ullmannite, millerite, tetrahedrite-(Zn), chalcopyrite and bornite. The two distinct compositional types of nickeline are present, the Sb-poor (with up to 0.03 apfu of Sb) and Sb-rich variety (with up to 0.12 apfu of Sb). Gersdorffite is mostly replacing nickeline as rims or it forms aggregates, rims around or veinlets in tetrahedrite-(Zn). The three compositionally different types of gersdorffite are present: Sb-rich (with Sb reaching up to 0.31 apfu) and variable Ni/Co/Fe ratio, As-rich gersdorffite (with up to 1.32 apfu of As) also containing minor Co and Fe and the last one is Fe-rich gersdorffite (with up to 0.24 apfu) and nearly ideal As/S ratio. Rammelsbergite, ullmannite and millerite occur as abundant, microscopic inclusions in nickeline and gersdorffite. In tetrahedrite-(Zn), Zn (up to 1.52 apfu) is dominant over (Fe up to 0.82, Ni up to 0.12, Hg up to 0.04 and Pb up to 0.01 apfu) and Sb is considerably prevailing (2.96 - 4.01 apfu) over As (0.02 - 1.02 apfu). Both chalcopyrite and bornite were observed as inclusions in tetrahedrite-(Zn).","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70597849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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