Z. Dolníček, Petr Stöhr, Jana Ulmanová, Luboš Vrtiška
Technical workings realized near Prackovice nad Labem (České středohoří Mts., Czech Republic) yielded new findings about rocks and mineral veins present in Cenozoic volcanites. The studied xenolith represents a piece of pyrometamorphosed and hydrothermally altered sandstone enclosed in an alkaline basic volcanic rock. The core of the xenolith contains relicts of clasts of quartz, embedded in a matrix composed of laths of quartz (probably pseudomorphs of quartz after tridymite) and symplectitic intergrowths of alkali feldspar (sanidine Or57-81Ab19-41An0-1) and quartz. This core is rimmed by drusy overgrowths of sanidine and crystals of fluorapatite, aegirine-augite and titanite. All silicates are characterized by a significant substitution of Al by Fe3+, which is probably the result of high content of Fe3+ in the sandstone protolith (perhaps in limonite cement). The marginal part of xenolith is formed by zeolites (chabazite-K and phillipsite-K), saponite and calcite. These minerals likely crystallized at very low temperatures (<100 °C) in a vug, leaving after volatiles, which were expelled during pyrometamorphism of the xenolith. In addition, we have studied tiny hydrothermal veinlets hosted by neovolcanites, composed of a mixture of Al-rich phyllosilicates (probably a mineral from the kaolinite group and smectite) and strongly substituted carbonates including siderite (Sid55-91Mag3-38Cal5-31Rdc1) and calcite (Cal58-90 Mag8-41Sid1-6).
{"title":"Kausticky metamorfovaný pískovcový xenolit a doprovodná hydrotermální mineralizace z neovulkanitů od Prackovic nad Labem (České středohoří)","authors":"Z. Dolníček, Petr Stöhr, Jana Ulmanová, Luboš Vrtiška","doi":"10.46861/bmp.30.095","DOIUrl":"https://doi.org/10.46861/bmp.30.095","url":null,"abstract":"Technical workings realized near Prackovice nad Labem (České středohoří Mts., Czech Republic) yielded new findings about rocks and mineral veins present in Cenozoic volcanites. The studied xenolith represents a piece of pyrometamorphosed and hydrothermally altered sandstone enclosed in an alkaline basic volcanic rock. The core of the xenolith contains relicts of clasts of quartz, embedded in a matrix composed of laths of quartz (probably pseudomorphs of quartz after tridymite) and symplectitic intergrowths of alkali feldspar (sanidine Or57-81Ab19-41An0-1) and quartz. This core is rimmed by drusy overgrowths of sanidine and crystals of fluorapatite, aegirine-augite and titanite. All silicates are characterized by a significant substitution of Al by Fe3+, which is probably the result of high content of Fe3+ in the sandstone protolith (perhaps in limonite cement). The marginal part of xenolith is formed by zeolites (chabazite-K and phillipsite-K), saponite and calcite. These minerals likely crystallized at very low temperatures (<100 °C) in a vug, leaving after volatiles, which were expelled during pyrometamorphism of the xenolith. In addition, we have studied tiny hydrothermal veinlets hosted by neovolcanites, composed of a mixture of Al-rich phyllosilicates (probably a mineral from the kaolinite group and smectite) and strongly substituted carbonates including siderite (Sid55-91Mag3-38Cal5-31Rdc1) and calcite (Cal58-90 Mag8-41Sid1-6).","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70599652","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 tennantite-(Hg) was recently confirmed at the Vyšný Klátov ore occurrence, Spišsko-gemerské rudohorie Mts., Košice-okolie Co., Košice Region, Slovakia. Tennantite-(Hg) occurs as lead-gray to black grains and aggregates up to 1 cm in size, associated with cinnabar, chalcopyrite, pyrite and hematite. Reflectance data of tennantite-(Hg) are given in this paper. The refined unit-cell parameters of tennantite-(Hg) from the Vyšný Klátov (for the cubic space group I-43m) are: a 22.523(7) Å and V 3105.4(1) Å3. Empirical chemical formulae of the two studied samples of tennantite-(Hg) from the Vyšný Klátov ore occurrence, recalculated on the basis of ΣMe = 16 apfu are: (Cu5.97Ag0.03)Σ6.00[Cu3.99(Hg1.95Fe0.10)Σ2.05](As3.57Sb0.39)Σ3.96S13.21 (sample VK1, n = 21) and (Cu5.99Ag0.01)Σ6.00[Cu4.05(Hg1.91Fe0.08)Σ1.99] (As3.79Sb0.15)Σ3.94S13.26 (sample VK3, n = 29).
{"title":"New data on sulphosalts from the hydrothermal siderite-type veins in the Spišsko-gemerské rudohorie Mts. (eastern Slovakia): 4. Tennantite-(Hg) from the Vyšný Klátov ore occurrence","authors":"M. Števko, Jiří Sejkora, T. Mikuš, Dušan Peterec","doi":"10.46861/bmp.30.243","DOIUrl":"https://doi.org/10.46861/bmp.30.243","url":null,"abstract":"A new occurrence of tennantite-(Hg) was recently confirmed at the Vyšný Klátov ore occurrence, Spišsko-gemerské rudohorie Mts., Košice-okolie Co., Košice Region, Slovakia. Tennantite-(Hg) occurs as lead-gray to black grains and aggregates up to 1 cm in size, associated with cinnabar, chalcopyrite, pyrite and hematite. Reflectance data of tennantite-(Hg) are given in this paper. The refined unit-cell parameters of tennantite-(Hg) from the Vyšný Klátov (for the cubic space group I-43m) are: a 22.523(7) Å and V 3105.4(1) Å3. Empirical chemical formulae of the two studied samples of tennantite-(Hg) from the Vyšný Klátov ore occurrence, recalculated on the basis of ΣMe = 16 apfu are: (Cu5.97Ag0.03)Σ6.00[Cu3.99(Hg1.95Fe0.10)Σ2.05](As3.57Sb0.39)Σ3.96S13.21 (sample VK1, n = 21) and (Cu5.99Ag0.01)Σ6.00[Cu4.05(Hg1.91Fe0.08)Σ1.99] (As3.79Sb0.15)Σ3.94S13.26 (sample VK3, n = 29).","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70600062","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}
Pavol Myšľan, Martin Števko, Jiří Sejkora, Zdeněk Dolníček
An interesting zeolite association has been identified at the localities Byšta, Brezina and Kuzmice, consisting of mordenite, clinoptilolite-Ca, dachiardite-Ca and ferrierite-Mg. Dachiardite-Ca (from Byšta and Brezina) and ferrierite-Mg (from Brezina) represent first recorded occurrences in the Slovak Republic. Zeolite mineralization occurs as white to gray crystalline fillings in small chalcedony cavities and crusts, developed in strongly altered Miocene rhyolites (Byšta and Brezina) or silicified andesites (Kuzmice). Crystals of dachiardite-Ca have acicular shapes, and are grouped into the radial, spherical and sheaf-like aggregates. Their average size ranges about 1 - 3 mm. Dachiardite-Ca from Byšta and Brezina is monoclinic, space group C2/m with following unit-cell parameters refined from X-ray powder diffraction data: a 18.618(8), b 7.498(3), c 10.284(4) Å, β 108.36(3)o, V 1362.4(1.3) Å3 and a 18.616(12), b 7.492(5), c 10.271(6) Å, β 108.27(5)o, V 1360.2(2.0) Å3, respectively. Chemical analysis is corresponding to the average empirical formula (Ca1.12K0.78Na0.16)Σ3.52(Al3.52Si20.56O48)·13H2O for dachiardite-Ca from Byšta and (Ca1.37Na0.48K0.25Ba0.02Mg0.02)Σ3.65(Al3.65Si20.37O48)·13H2O for dachiardite-Ca from Brezina. Ferrierite-Mg from Brezina forms acicular crystals and spherical aggregates of average size up to 1 mm. It is orthorhombic, space group Immm with following unit-cell parameters refined from X-ray powder difraction data: a 19.084(4), b 14.151(2), c 7.4932(16) Å, V 2023.7(1) Å3. Chemical analysis of ferrierite-Mg is corresponding to the following average empirical formula: (Mg1.14Ca0.48Ba0.40K0.28Na0.16Fe0.01)Σ2.47(Al5.09 Si31.06O72)·20H2O. PXRD as well as quantitative chemical data for clinoptilolite-Ca and mordenite are also provided in this paper. The formation of studied zeolites is associated with post-magmatic fluids significantly enriched in Si, which likely circulated during the younger stages of Miocene volcanic activity in the Slanské vrchy Mts. Hydrothermal fluids were probably generated from Si-rich rocks, represented predominantly by rhyolites under low temperature conditions (120 - 250 °C).
在Byšta、Brezina和Kuzmice地区发现了一种有趣的沸石组合，由丝光沸石、斜沸石- ca、dachiardite-Ca和铁铁沸石- mg组成。Dachiardite-Ca(来自Byšta和Brezina)和ferrierite-Mg(来自Brezina)代表了斯洛伐克共和国首次记录的出现。沸石矿化以白色到灰色的晶体充填在小的玉髓腔和壳中，发育于强烈蚀变的中新世流纹岩(Byšta和Brezina)或硅化安山岩(Kuzmice)中。dachiardite-Ca的晶体呈针状，可分为放射状、球形和束状聚集体。它们的平均尺寸约为1 - 3毫米。Byšta和Brezina的Dachiardite-Ca为单斜晶，空间群C2/m，由x射线粉末衍射数据得到的单位胞参数分别为:a 18.618(8)， b 7.498(3)， c 10.284(4) Å， β 108.36(3)o, V 1362.4(1.3) Å3和a 18.616(12)， b 7.492(5)， c 10.271(6) Å， β 108.27(5)o, V 1360.2(2.0) Å3。化学分析对应于Byšta的dachiardite-Ca的平均经验公式(Ca1.12K0.78Na0.16)Σ3.52(Al3.52Si20.56O48)·13H2O和Brezina的dachiardite-Ca的平均经验公式(Ca1.37Na0.48K0.25Ba0.02Mg0.02)Σ3.65(Al3.65Si20.37O48)·13H2O。布雷齐纳的铁素体-镁形成针状晶体和球形聚集体，平均大小可达1毫米。它是正交的空间群Immm，从x射线粉末衍射数据中得到以下单位胞参数:a 19.084(4)， b 14.151(2)， c 7.4932(16) Å， V 2023.7(1) Å3。铁素体- mg的化学分析对应如下平均实验式:(Mg1.14Ca0.48Ba0.40K0.28Na0.16Fe0.01)Σ2.47(Al5.09 Si31.06O72)·20H2O。本文还提供了斜沸石-钙和丝光沸石的PXRD和定量化学数据。沸石的形成与明显富硅的岩浆后流体有关，这些流体可能是在中新世火山活动的年轻阶段循环形成的，热液流体可能是在低温条件下(120 ~ 250℃)以流纹岩为主的富硅岩石中形成的。
{"title":"Dachiardit-Ca, ferrierit-Mg a sprievodná zeolitová mineralizácia v dutinách chalcedónov na lokalitách Byšta, Brezina a Kuzmice (Slanské vrchy, Slovenská republika)","authors":"Pavol Myšľan, Martin Števko, Jiří Sejkora, Zdeněk Dolníček","doi":"10.46861/bmp.30.045","DOIUrl":"https://doi.org/10.46861/bmp.30.045","url":null,"abstract":"An interesting zeolite association has been identified at the localities Byšta, Brezina and Kuzmice, consisting of mordenite, clinoptilolite-Ca, dachiardite-Ca and ferrierite-Mg. Dachiardite-Ca (from Byšta and Brezina) and ferrierite-Mg (from Brezina) represent first recorded occurrences in the Slovak Republic. Zeolite mineralization occurs as white to gray crystalline fillings in small chalcedony cavities and crusts, developed in strongly altered Miocene rhyolites (Byšta and Brezina) or silicified andesites (Kuzmice). Crystals of dachiardite-Ca have acicular shapes, and are grouped into the radial, spherical and sheaf-like aggregates. Their average size ranges about 1 - 3 mm. Dachiardite-Ca from Byšta and Brezina is monoclinic, space group C2/m with following unit-cell parameters refined from X-ray powder diffraction data: a 18.618(8), b 7.498(3), c 10.284(4) Å, β 108.36(3)o, V 1362.4(1.3) Å3 and a 18.616(12), b 7.492(5), c 10.271(6) Å, β 108.27(5)o, V 1360.2(2.0) Å3, respectively. Chemical analysis is corresponding to the average empirical formula (Ca1.12K0.78Na0.16)Σ3.52(Al3.52Si20.56O48)·13H2O for dachiardite-Ca from Byšta and (Ca1.37Na0.48K0.25Ba0.02Mg0.02)Σ3.65(Al3.65Si20.37O48)·13H2O for dachiardite-Ca from Brezina. Ferrierite-Mg from Brezina forms acicular crystals and spherical aggregates of average size up to 1 mm. It is orthorhombic, space group Immm with following unit-cell parameters refined from X-ray powder difraction data: a 19.084(4), b 14.151(2), c 7.4932(16) Å, V 2023.7(1) Å3. Chemical analysis of ferrierite-Mg is corresponding to the following average empirical formula: (Mg1.14Ca0.48Ba0.40K0.28Na0.16Fe0.01)Σ2.47(Al5.09 Si31.06O72)·20H2O. PXRD as well as quantitative chemical data for clinoptilolite-Ca and mordenite are also provided in this paper. The formation of studied zeolites is associated with post-magmatic fluids significantly enriched in Si, which likely circulated during the younger stages of Miocene volcanic activity in the Slanské vrchy Mts. Hydrothermal fluids were probably generated from Si-rich rocks, represented predominantly by rhyolites under low temperature conditions (120 - 250 °C).","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70599751","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}
Investigated metacarbonates are located in the Early Paleozoic rocks of Southern Gemericum unit, Slovakia. Metacarbonates are part of Vlachovo Formation (Tichá Voda, Stará Voda) and Bystrý potok Formation (Betliar, Čučma, Malá Hekerová, Smolník - Mária Terézia, Holec). Detailed studies indicated metamorphic pressure-temperature (P-T) conditions of 3 - 7 kbar at 330 - 370 °C for the Gelnica Group. The calculated P-T conditions were verified using chlorite geothermometer and phengite geobarometer. Mineral association of metacarbonates consists of Si rich (3.10 - 3.35 apfu) phengitic micas, Fe-Mg chlorites (clinochlore and chamosite), quartz, K-feldspars and accessory fluorapatite. Micas and Mg-Fe chlorites originated from metamorphic recrystallization of clay material with incorporations of basic pyroclastic material during the regional metamorphosis of pelitic protolith, which sedimented continuously with carbonates. Metacarbonates belong to the upper parts of Gelnica Group, which were metamorphosed under the greenschist facies conditions.
所研究的偏碳酸盐岩位于斯洛伐克南gemicum单元早古生代岩石中。偏碳酸盐岩是Vlachovo组(tich Voda, star Voda)和Bystrý potok组(Betliar， Čučma, mal hekerov， Smolník - Mária tersamizia, Holec)的一部分。详细的研究表明，Gelnica Group在330 - 370°C下的变质压力-温度(P-T)条件为3 - 7 kbar。用绿泥石地温计和云母地压计对计算的P-T条件进行了验证。偏碳酸盐的矿物组合由富硅(3.10 ~ 3.35 apfu)的腐殖云母、铁镁绿泥石(斜长石和色辉石)、石英、钾长石和辅氟磷灰石组成。云母和镁铁绿泥石来源于泥质原岩区域变质过程中粘土物质的变质再结晶和基性火山碎屑物质的掺入，与碳酸盐连续沉积。偏碳酸盐岩属于格尔尼卡组上部，在绿片岩相条件下变质。
{"title":"Sľudy a chlority ako indikátory podmienok metamorfózy karbonátových hornín gelnickej skupiny južného gemerika (Slovenská republika)","authors":"Pavol Myšľan, Peter Ružička","doi":"10.46861/bmp.30.108","DOIUrl":"https://doi.org/10.46861/bmp.30.108","url":null,"abstract":"Investigated metacarbonates are located in the Early Paleozoic rocks of Southern Gemericum unit, Slovakia. Metacarbonates are part of Vlachovo Formation (Tichá Voda, Stará Voda) and Bystrý potok Formation (Betliar, Čučma, Malá Hekerová, Smolník - Mária Terézia, Holec). Detailed studies indicated metamorphic pressure-temperature (P-T) conditions of 3 - 7 kbar at 330 - 370 °C for the Gelnica Group. The calculated P-T conditions were verified using chlorite geothermometer and phengite geobarometer. Mineral association of metacarbonates consists of Si rich (3.10 - 3.35 apfu) phengitic micas, Fe-Mg chlorites (clinochlore and chamosite), quartz, K-feldspars and accessory fluorapatite. Micas and Mg-Fe chlorites originated from metamorphic recrystallization of clay material with incorporations of basic pyroclastic material during the regional metamorphosis of pelitic protolith, which sedimented continuously with carbonates. Metacarbonates belong to the upper parts of Gelnica Group, which were metamorphosed under the greenschist facies conditions.","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70599720","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}
Studied calcareous phyllites represent a part of Carboniferous Črmeľ Formation of the Northern Gemericum Unit (Western Carpathians, Slovak Republic). The mineral association of calcareous phyllites is composed of quartz, calcite, muscovite, Mg-Fe chlorites, albite and accessory minerals (fluorapatite, titanite, zircon and tourmalines). Chemical composition of analyzed muscovites has higher contents of Si (3.38 - 3.40 apfu) with K (up to 0.94 apfu), Fe2+ (up to 0.18 apfu) and Mg (up to 0.33 apfu). Chlorites contain Mg in range 2.12 - 2.36 apfu and Fe2+ in range 2.12 - 2.36 apfu with Fe/(Fe+Mg) ratio between 0.49 and 0.54. Chemical composition of albites is Ab97.9-99.7 An1.9Or0.5. Content of F- (up to 0.07 apfu) and OH- (up to 0.07 apfu) in titanite is slightly increased with lower amount Ti (0.89 - 0.92 apfu). In titanites not very significant (Al, Fe3+) + (OH, F) ↔ Ti + O substitution was also identified. Zircon consists of Si (up to 1.04 apfu), Zr (up to 0.96 apfu) and very low content of Hf (up to 0.02 apfu). Two types of tourmalines in calcareous phyllites are also present. Zonal tourmalines with central parts composed of schorl (1.95 - 2.47 apfu Fe; 0.93 - 0.97 apfu Mg; 0.45 apfu Na) and peripheral parts composed of dravite (1.09 - 1.19 apfu Fe; 1.66 - 1.93 apfu Mg; Na up to 0.79 apfu) and indistinctly zoned to non-zoned tourmalines were identified as magnesio-foitite (1.01 - 1.34 apfu Fe; 1.23 - 1.70 apfu Mg; 0.52 - 0.67 pfu vacancy). Studies of calcareous phyllites indicated metamorphic pressure-temperature conditions of 8 - 9 kbar at 330 - 340 °C using chlorite geothermometer and phengite geobarometer.
{"title":"Minerálne zloženie laminovaných vápnitých fylitov z Črmeľskej doliny pri Košiciach (severné gemerikum, Slovenská republika)","authors":"Peter Ružička, Pavol Myšľan","doi":"10.46861/bmp.30.061","DOIUrl":"https://doi.org/10.46861/bmp.30.061","url":null,"abstract":"Studied calcareous phyllites represent a part of Carboniferous Črmeľ Formation of the Northern Gemericum Unit (Western Carpathians, Slovak Republic). The mineral association of calcareous phyllites is composed of quartz, calcite, muscovite, Mg-Fe chlorites, albite and accessory minerals (fluorapatite, titanite, zircon and tourmalines). Chemical composition of analyzed muscovites has higher contents of Si (3.38 - 3.40 apfu) with K (up to 0.94 apfu), Fe2+ (up to 0.18 apfu) and Mg (up to 0.33 apfu). Chlorites contain Mg in range 2.12 - 2.36 apfu and Fe2+ in range 2.12 - 2.36 apfu with Fe/(Fe+Mg) ratio between 0.49 and 0.54. Chemical composition of albites is Ab97.9-99.7 An1.9Or0.5. Content of F- (up to 0.07 apfu) and OH- (up to 0.07 apfu) in titanite is slightly increased with lower amount Ti (0.89 - 0.92 apfu). In titanites not very significant (Al, Fe3+) + (OH, F) ↔ Ti + O substitution was also identified. Zircon consists of Si (up to 1.04 apfu), Zr (up to 0.96 apfu) and very low content of Hf (up to 0.02 apfu). Two types of tourmalines in calcareous phyllites are also present. Zonal tourmalines with central parts composed of schorl (1.95 - 2.47 apfu Fe; 0.93 - 0.97 apfu Mg; 0.45 apfu Na) and peripheral parts composed of dravite (1.09 - 1.19 apfu Fe; 1.66 - 1.93 apfu Mg; Na up to 0.79 apfu) and indistinctly zoned to non-zoned tourmalines were identified as magnesio-foitite (1.01 - 1.34 apfu Fe; 1.23 - 1.70 apfu Mg; 0.52 - 0.67 pfu vacancy). Studies of calcareous phyllites indicated metamorphic pressure-temperature conditions of 8 - 9 kbar at 330 - 340 °C using chlorite geothermometer and phengite geobarometer.","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70599819","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}
Eva Víšková, Stanislav Houzar, Radek Škoda, Stanislav Kopecký, Jiří Toman, P. Pauliš
Supergene mineral assemblages rich in Pb, As and P occur on the dumps after the historical mining of the base-metal deposit in Kvasetice (Havlíčkův Brod ore district, Bohemian-Moravian Highlands, Czech Republic). The primary hydrothermal assemblage of pyrite > sphalerite > arsenopyrite > galena >> boulangerite hosted in the quartz veins is partly different from other similar localities in this area, which belong to the typical k-pol ores with iron-rich sphalerite, pyrrhotite, pyrite, arsenopyrite and chalcopyrite. Kvasetice locality is characterized by a relatively higher stability of pyrite and sphalerite with a relatively low Fe content (< 0.12 apfu of Fe) compared to arsenopyrite and galena in supergene conditions, as well as a total deficit of Cu, Ca and partly S. In the supergene mineral association rich in Pb-P-Fe-As, two main assemblages can be distinguished. Supergene assemblage I contains common microscopic anglesite replacing galena and two sub-groups of arsenates with sulphide relics in small quartz veins: (a) in close association with the relic arsenopyrite are pharmacosiderite and hydroniumpharmacosiderite, both relatively Pb-rich (≤ 0.18 apfu of Pb), accompanied by a rare scorodite. (b) More abundant assemblage of segnitite >> beudantite > mimetite >> carminite and coronadite without a direct association with sulphides. Other phases with a non-stoichiometric Fe/As ratio (HFA) are only locally found. A sporadic greenockite is the only detected decomposition product of sphalerite. The Pb-Fe3+ sulfates (minerals of the jarosite subgroup), gypsum, and Ca-, Zn-, Sb- and Cu-supergene minerals are missing. Supergene assemblage II is mainly represented by pyromorphite (mostly with As below detection limit, but locally with ≤ 0.44 apfu), rarely by mimetite and only locally also by cerussite. They overgrow thin crusts of mainly Fe-oxyhydroxides covering the altered granite matrix or line thin druse quartz veinlets. The supergene mineral assemblages from Kvasetice differ not only from other localities in the ore district studied, but also from other localities of supergene mineralization in the Bohemian-Moravian Highlands. They are the product of weathering in the shallow supergene zone, however, they could also have been arised by subrecent weathering of materials deposited on the dumps during the 13-16th century.
{"title":"Olovem bohatá oxidační zóna polymetalické mineralizace na lokalitě Kvasetice u Havlíčkova Brodu: distribuce minerálních asociací s pyromorfitem a arzenáty","authors":"Eva Víšková, Stanislav Houzar, Radek Škoda, Stanislav Kopecký, Jiří Toman, P. Pauliš","doi":"10.46861/bmp.30.171","DOIUrl":"https://doi.org/10.46861/bmp.30.171","url":null,"abstract":"Supergene mineral assemblages rich in Pb, As and P occur on the dumps after the historical mining of the base-metal deposit in Kvasetice (Havlíčkův Brod ore district, Bohemian-Moravian Highlands, Czech Republic). The primary hydrothermal assemblage of pyrite > sphalerite > arsenopyrite > galena >> boulangerite hosted in the quartz veins is partly different from other similar localities in this area, which belong to the typical k-pol ores with iron-rich sphalerite, pyrrhotite, pyrite, arsenopyrite and chalcopyrite. Kvasetice locality is characterized by a relatively higher stability of pyrite and sphalerite with a relatively low Fe content (< 0.12 apfu of Fe) compared to arsenopyrite and galena in supergene conditions, as well as a total deficit of Cu, Ca and partly S. In the supergene mineral association rich in Pb-P-Fe-As, two main assemblages can be distinguished. Supergene assemblage I contains common microscopic anglesite replacing galena and two sub-groups of arsenates with sulphide relics in small quartz veins: (a) in close association with the relic arsenopyrite are pharmacosiderite and hydroniumpharmacosiderite, both relatively Pb-rich (≤ 0.18 apfu of Pb), accompanied by a rare scorodite. (b) More abundant assemblage of segnitite >> beudantite > mimetite >> carminite and coronadite without a direct association with sulphides. Other phases with a non-stoichiometric Fe/As ratio (HFA) are only locally found. A sporadic greenockite is the only detected decomposition product of sphalerite. The Pb-Fe3+ sulfates (minerals of the jarosite subgroup), gypsum, and Ca-, Zn-, Sb- and Cu-supergene minerals are missing. Supergene assemblage II is mainly represented by pyromorphite (mostly with As below detection limit, but locally with ≤ 0.44 apfu), rarely by mimetite and only locally also by cerussite. They overgrow thin crusts of mainly Fe-oxyhydroxides covering the altered granite matrix or line thin druse quartz veinlets. The supergene mineral assemblages from Kvasetice differ not only from other localities in the ore district studied, but also from other localities of supergene mineralization in the Bohemian-Moravian Highlands. They are the product of weathering in the shallow supergene zone, however, they could also have been arised by subrecent weathering of materials deposited on the dumps during the 13-16th century.","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70600041","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}
Luboš Vrtiška, J. Sejkora, Z. Dolníček, Radana Malíková
A very rare phosphate collinsite was found on historical samples of chamosite from the abandoned iron mine Nučice near Prague, Central Bohemia (Czech Republic) located in Ordovician sediments of the Barrandian area. Collinsite forms white to beige radial aggregates up to 15 mm in size composed by platy crystals with pearly lustre. Its chemical composition corresponds to empirical formula: (Ca1.87Sr0.12Ba0.01)Σ2.00(Mg0.57Fe0.41Al0.01)Σ0.99 (PO4)2.00·2H2O (Sr-rich zones) and (Ca1.98Sr0.01)Σ1.99(Mg0.58Fe0.40Al0.01)Σ0.99(PO4)2.00·2H2O (Sr-poor zones). Collinsite is triclinic, space group P-1, unit-cell parameters refined from X-ray powder diffraction data are a 5.734(3), b 6.779(3), c 5.441(2) Å, α 97.33(4)°, β 108.52(3)°, γ 107.25(3)° and V 185.7(1) Å3. Collinsite was found in association with siderite in fissures of chamosite iron ore.
在捷克中部波西米亚布拉格附近的nu冰废弃铁矿的历史样品中，发现了一种非常罕见的磷矿。collinite形成白色至米色的放射状聚集体，大小可达15毫米，由具有珍珠光泽的片状晶体组成。其化学组成对应于实验式:(Ca1.87Sr0.12Ba0.01)Σ2.00(Mg0.57Fe0.41Al0.01)Σ0.99 (PO4)2.00·2H2O(富sr区)和(Ca1.98Sr0.01)Σ1.99(Mg0.58Fe0.40Al0.01)Σ0.99(PO4)2.00·2H2O(贫sr区)。Collinsite为三斜体，空间群P-1，根据x射线粉末衍射数据改进的单位胞参数为a 5.734(3)， b 6.779(3)， c 5.441(2) Å， α 97.33(4)°，β 108.52(3)°，γ 107.25(3)°和V 185.7(1) Å3。在铁黄铁矿的裂隙中发现了与菱铁矿伴生的colinite。
{"title":"Collinsit ze železnorudného dolu v Nučicích, nový minerál pro Českou republiku - popis a Ramanova spektroskopie","authors":"Luboš Vrtiška, J. Sejkora, Z. Dolníček, Radana Malíková","doi":"10.46861/bmp.30.001","DOIUrl":"https://doi.org/10.46861/bmp.30.001","url":null,"abstract":"A very rare phosphate collinsite was found on historical samples of chamosite from the abandoned iron mine Nučice near Prague, Central Bohemia (Czech Republic) located in Ordovician sediments of the Barrandian area. Collinsite forms white to beige radial aggregates up to 15 mm in size composed by platy crystals with pearly lustre. Its chemical composition corresponds to empirical formula: (Ca1.87Sr0.12Ba0.01)Σ2.00(Mg0.57Fe0.41Al0.01)Σ0.99 (PO4)2.00·2H2O (Sr-rich zones) and (Ca1.98Sr0.01)Σ1.99(Mg0.58Fe0.40Al0.01)Σ0.99(PO4)2.00·2H2O (Sr-poor zones). Collinsite is triclinic, space group P-1, unit-cell parameters refined from X-ray powder diffraction data are a 5.734(3), b 6.779(3), c 5.441(2) Å, α 97.33(4)°, β 108.52(3)°, γ 107.25(3)° and V 185.7(1) Å3. Collinsite was found in association with siderite in fissures of chamosite iron ore.","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70599797","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}
S. Sutarto, A. Sulaksono, Dema Laksana T., Anggita Mahyudani, Ajimas Setiahadiwibowo P., M. Nurcholis
We investigated bedrock samples and their weathered horizons collected from the Muria Volcanic Complex (MVC), Central Java, Indonesia. In addition to petrographic study, samples were analysed using X-ray diffraction (XRD), inductively coupled plasma-atomic emission spectroscopy (ICP-AES), and inductively coupled plasma-mass spectrometry (ICP-MS) for mineral composition, major elements, and trace elements, respectively. Bedrock samples (n = 10) from the MVC have ΣREE ranging from 364 to 739 ppm (avg. 579 ppm). Basanite (n = 2) and phonotephrite (n = 2) are consistently high in ΣREE (659 - 739 ppm) compared with basaltic trachyandesite, trachyandesite, and trachyte. Apatite is the only REE-bearing mineral observed in basanite and phonotephrite (up to ~1 vol.%). The ΣREE is positively corelated with P2O5, which inversely corelates with SiO2. The weathered horizons contain clay minerals that consist primarily of kaolinite ± halloysite. The REE content of the weathered horizons (n = 7) is up to 183 ppm higher than those of the bedrocks. The decrease in CaO and P2O5 indicates a fractionation of apatite at early stage of magma evolution, resulting in the depletion in the ΣREE content in the residual melt. We suggest that apatite is the major host of REE in the MVC alkali-rich, silica-undersaturated volcanic rocks, as evidenced by our petrographic and geochemical data. We also suggest that the increase in ΣREE in the weathered horizon is due to the presence of clay minerals, particularly kaolinite and halloysite.
{"title":"REE content of volcanic rocks and their weathered horizons in the Muria Volcanic Complex, Central Java, Indonesia","authors":"S. Sutarto, A. Sulaksono, Dema Laksana T., Anggita Mahyudani, Ajimas Setiahadiwibowo P., M. Nurcholis","doi":"10.46861/bmp.30.028","DOIUrl":"https://doi.org/10.46861/bmp.30.028","url":null,"abstract":"We investigated bedrock samples and their weathered horizons collected from the Muria Volcanic Complex (MVC), Central Java, Indonesia. In addition to petrographic study, samples were analysed using X-ray diffraction (XRD), inductively coupled plasma-atomic emission spectroscopy (ICP-AES), and inductively coupled plasma-mass spectrometry (ICP-MS) for mineral composition, major elements, and trace elements, respectively. Bedrock samples (n = 10) from the MVC have ΣREE ranging from 364 to 739 ppm (avg. 579 ppm). Basanite (n = 2) and phonotephrite (n = 2) are consistently high in ΣREE (659 - 739 ppm) compared with basaltic trachyandesite, trachyandesite, and trachyte. Apatite is the only REE-bearing mineral observed in basanite and phonotephrite (up to ~1 vol.%). The ΣREE is positively corelated with P2O5, which inversely corelates with SiO2. The weathered horizons contain clay minerals that consist primarily of kaolinite ± halloysite. The REE content of the weathered horizons (n = 7) is up to 183 ppm higher than those of the bedrocks. The decrease in CaO and P2O5 indicates a fractionation of apatite at early stage of magma evolution, resulting in the depletion in the ΣREE content in the residual melt. We suggest that apatite is the major host of REE in the MVC alkali-rich, silica-undersaturated volcanic rocks, as evidenced by our petrographic and geochemical data. We also suggest that the increase in ΣREE in the weathered horizon is due to the presence of clay minerals, particularly kaolinite and halloysite.","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70599527","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}
The new occurrence of well-crystalline Al-hydroxide, nordstrandite, was found in the Richter quarry in Hammerunterwiesenthal (Germany). Nordstrandite forms a cluster of pink-orange elongated translucent lanceolate crystals of 6 × 3 mm in size. Nordstrandite is triclinic, space group P-1 with following unit-cell parameters: a 5.111(9), b 5.079(9), c 5.132(8) Å, α 70.3(1)°, β 74.1(9)°, γ 58.5(9)° and V 106.2(4) Å. Raman spectrum agrees very well with published data for this mineral phase and is considerably different from Raman spectra of another Al(OH)3 polymorphs. Nordstrandite was found in the close association with natrolite
在德国Hammerunterwiesenthal (Hammerunterwiesenthal)的Richter采石场发现了一种结晶良好的氢氧化铝(nordstrandite)。Nordstrandite形成一个6 × 3毫米大小的粉橙色细长半透明披针形晶体簇。Nordstrandite为三斜状，空间群P-1，单位胞参数为:a 5.111(9)， b 5.079(9)， c 5.132(8) Å， α 70.3(1)°，β 74.1(9)°，γ 58.5(9)°，V 106.2(4) Å。拉曼光谱与该矿物相的已发表数据非常吻合，与另一种Al(OH)3多晶的拉曼光谱有很大不同。Nordstrandite被发现与钠硝石有密切的联系
{"title":"Nordstrandit z Richterova lomu v saském Hammerunterwiesenthalu (Německo)","authors":"Luboš Vrtiška, J. Sejkora, Radana Malíková","doi":"10.46861/bmp.30.154","DOIUrl":"https://doi.org/10.46861/bmp.30.154","url":null,"abstract":"The new occurrence of well-crystalline Al-hydroxide, nordstrandite, was found in the Richter quarry in Hammerunterwiesenthal (Germany). Nordstrandite forms a cluster of pink-orange elongated translucent lanceolate crystals of 6 × 3 mm in size. Nordstrandite is triclinic, space group P-1 with following unit-cell parameters: a 5.111(9), b 5.079(9), c 5.132(8) Å, α 70.3(1)°, β 74.1(9)°, γ 58.5(9)° and V 106.2(4) Å. Raman spectrum agrees very well with published data for this mineral phase and is considerably different from Raman spectra of another Al(OH)3 polymorphs. Nordstrandite was found in the close association with natrolite","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70599978","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}
Three types of garnet-bearing lithologies sampled in the quarry Libodřice near Kolín (Kutná Hora Crystalline Complex, Czech Republic) were studied by means of BSE imaging and electron microprobe analyses. The first type is represented by common garnetic amphibolites, in which garnet forms isolated millimetre-sized porphyroblasts containing numerous inclusions of minerals of the host amphibolite matrix (plagioclase, epidote, amphibole, sulphides). The composition of weakly zoned garnet is Alm55-56Grs30-37Sps1-5Prp5-12Adr0-3. Second type is garnetite, composed of garnet+quartz or garnet+epidote, in both cases with minor amphibole, which forms rare centimetre-thick bands in amphibolites. The garnetite garnet is distinctly zoned, with cores enriched in spessartine component (Alm42-51Grs29-38Sps11-16 Prp2-8Adr0-3Ti-Grs0-1F-Kat0-1) and margins depleted in Sps and enriched in pyrope component (Alm49-54Grs28-35Sps4-10 Prp7-11Adr0-1F-Kat0-1). The origin of the pronounced enrichment in Mn is interpreted in terms of specific chemical composition of protolith of this garnetite, which was likely represented by a chemogenic precipitate rich in Si, Al, Fe, Mn and in places possibly also Ca. The last found garnetiferous lithology is represented by zoned reaction skarn rimming small xenoliths of calcitic marbles enclosed in amphibolites. The garnet-rich zone of the skarn is dominated by chemically homogeneous grossularite with composition Grs73-76Adr16-21Alm2-5Ti-Grs1-2Sps1F-Kat1Gol0-1.
{"title":"Chemické složení granátů v amfibolitech z lomu Libodřice u Kolína (kutnohorské krystalinikum, Česká republika)","authors":"Z. Dolníček, Jana Ulmanová","doi":"10.46861/bmp.30.205","DOIUrl":"https://doi.org/10.46861/bmp.30.205","url":null,"abstract":"Three types of garnet-bearing lithologies sampled in the quarry Libodřice near Kolín (Kutná Hora Crystalline Complex, Czech Republic) were studied by means of BSE imaging and electron microprobe analyses. The first type is represented by common garnetic amphibolites, in which garnet forms isolated millimetre-sized porphyroblasts containing numerous inclusions of minerals of the host amphibolite matrix (plagioclase, epidote, amphibole, sulphides). The composition of weakly zoned garnet is Alm55-56Grs30-37Sps1-5Prp5-12Adr0-3. Second type is garnetite, composed of garnet+quartz or garnet+epidote, in both cases with minor amphibole, which forms rare centimetre-thick bands in amphibolites. The garnetite garnet is distinctly zoned, with cores enriched in spessartine component (Alm42-51Grs29-38Sps11-16 Prp2-8Adr0-3Ti-Grs0-1F-Kat0-1) and margins depleted in Sps and enriched in pyrope component (Alm49-54Grs28-35Sps4-10 Prp7-11Adr0-1F-Kat0-1). The origin of the pronounced enrichment in Mn is interpreted in terms of specific chemical composition of protolith of this garnetite, which was likely represented by a chemogenic precipitate rich in Si, Al, Fe, Mn and in places possibly also Ca. The last found garnetiferous lithology is represented by zoned reaction skarn rimming small xenoliths of calcitic marbles enclosed in amphibolites. The garnet-rich zone of the skarn is dominated by chemically homogeneous grossularite with composition Grs73-76Adr16-21Alm2-5Ti-Grs1-2Sps1F-Kat1Gol0-1.","PeriodicalId":53145,"journal":{"name":"Bulletin Mineralogie Petrologie","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70600231","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：