{"title":"Activation energy of annealed, partially metamict davidite by 57Fe Mössbauer spectroscopy","authors":"D. Malczewski, A. Grabias, M. Dziurowicz","doi":"10.3190/jgeosci.298","DOIUrl":"https://doi.org/10.3190/jgeosci.298","url":null,"abstract":"","PeriodicalId":15957,"journal":{"name":"Journal of Geosciences","volume":"65 1","pages":"37-44"},"PeriodicalIF":1.4,"publicationDate":"2020-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41515981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Crystal structure of the uranyl-molybdate mineral calcurmolite Ca[(UO2)3(MoO4)2(OH)4](H2O)˜5.0: insights from a precession electron-diffraction tomography study","authors":"G. Steciuk, R. Škoda, J. Rohlíček, J. Plášil","doi":"10.3190/jgeosci.297","DOIUrl":"https://doi.org/10.3190/jgeosci.297","url":null,"abstract":"Calcurmolite is a rare supergene U mineral formed during the alteration–hydration weathering of uraninite and hypogene Mo minerals; its structure has remained unsolved owing to a lack of crystal material suitable for conventional structure analysis. Here, single-crystal precession electron-diffraction tomography shows the calcurmolite (Rabejac, France) structure to be modulated; it is triclinic, crystallizing in the super-space group P1(α00)0, with a = 3.938 Å, b = 11.26 Å, c = 14.195 Å, α = 84.4°, β = 112.5°, γ = 133.95° and has a modulation vector q = 0.4 a*. Due to the poor quality of diffraction data, only a kinematical refinement was undertaken, although final results were reasonable: Robs/Rall = 0.3825/0.3834 for 3953/17442 observed/all reflections. The structure of calcurmolite is based upon the infinite uranyl–molybdate sheets with baumoite topology (U : Mo ratio = 1.5) and an interlayer of 6-coordinated Ca2+ cations with interstitial H2O (ligands are apical uranyl O atoms and molecular H2O). Adjacent sheets are linked via Ca–O, as well as H-bonds. The structure formula, based on assumed occupancies in the supercell 5a × b × c, is Ca[(UO2)3 (MoO4)2(OH)4](H2O)~5.0 (for Z = 4).","PeriodicalId":15957,"journal":{"name":"Journal of Geosciences","volume":"65 1","pages":"15-25"},"PeriodicalIF":1.4,"publicationDate":"2020-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45905087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Foreword to the special issue arising from the 9th European Conference on Mineralogy and Spectroscopy","authors":"F. Laufek, J. Plášil, J. Cempírek, R. Škoda","doi":"10.3190/jgeosci.302","DOIUrl":"https://doi.org/10.3190/jgeosci.302","url":null,"abstract":"Spectroscopy methods provide valuable information about the local structure of minerals, since they do not depend on long-range periodicity (they are sensitive to defects or substitutions and vice versa), and, therefore represent great complementary techniques to diffraction methods that are used to analyze periodic (global) structures of minerals. Spectroscopy techniques have been successfully applied to the minerals during past decades, namely due to still-growing possibilities connected with the evolution of the instrumentation and data analysis. Following the European Spectroscopic Conferences in Rome (1988), Berlin (1995), Kiev (1996), Paris (2001), Vienna (2004), Stockholm (2007), Potsdam (2011) and Rome (2015), the 9th European Conference on Mineralogy and Spectroscopy (ECMS 2019) took place at Břevnov Monastery, Prague, Czech Republic on September 10–13, 2019. The conference brought together 111 participants from 20 countries. One hundred two oral and poster contributions were presented during three days. Among these contributions, six invited keynote-talks were presented by Peter C. Burns (University of Notre Dame, USA), Janice Bishop (SETI Institute, USA), Sergey V. Krivovichev (St. Petersburg State University, Russia), Anna Vymazalová (Czech Geological Survey, Czechia), Jural Majzlan (Friedrich Schiller Universität, Germany) and Sergey S. Lobanov (GFZ German Research Center for Geosciences, Germany). About one third of the delegates were students, who had the opportunity to present their work to broad international audience. Two workshops focused on gemstone deposits and training in crystallographic com-","PeriodicalId":15957,"journal":{"name":"Journal of Geosciences","volume":"65 1","pages":"1-2"},"PeriodicalIF":1.4,"publicationDate":"2020-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47210758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Petrogenesis of fractionated nested granite intrusions: the Sedmihoří Composite Stock (Bohemian Massif)","authors":"J. Trubač, V. Janoušek, A. Gerdes","doi":"10.3190/jgeosci.294","DOIUrl":"https://doi.org/10.3190/jgeosci.294","url":null,"abstract":"1 Institute of Geochemistry, Mineralogy and Mineral Resources, Charles University, Albertov 6, 128 43 Prague 2, Czech Republic; jakub.trubac@gmail.com 2 Czech Geological Survey, Klárov 3, 118 21 Prague 1, Czech Republic 3 Institute of Petrology and Structural Geology, Charles University, Albertov 6, 128 43 Prague 2, Czech Republic 4 Institut für Geowissenschaften, Goethe University Frankfurt, Altenhöferallee 1, D-60438, Frankfurt am Main, Germany * Corresponding author","PeriodicalId":15957,"journal":{"name":"Journal of Geosciences","volume":"64 1","pages":"271-294"},"PeriodicalIF":1.4,"publicationDate":"2020-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41634465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
O. Bergal-Kuvikas, V. Leonov, A. Rogozin, I. Bindeman, Evgeniy Kliapitskiy, T. Churikova
{"title":"Stratigraphy, structure and geology of Late Miocene Verkhneavachinskaya caldera with basaltic-andesitic ignimbrites at Eastern Kamchatka","authors":"O. Bergal-Kuvikas, V. Leonov, A. Rogozin, I. Bindeman, Evgeniy Kliapitskiy, T. Churikova","doi":"10.3190/jgeosci.295","DOIUrl":"https://doi.org/10.3190/jgeosci.295","url":null,"abstract":"1 Institute of Volcanology and Seismology, Far East Branch, Russian Academy of Science, Piip Boulevard 9, Petropavlovsk-Kamchatsky, 683006, Russia; olgakuvikas@gmail.com 2 Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Staromonetnyi per. 35, Moscow, 119017, Russia 3 Fersman Mineralogical Museum, Leninskii avenue 18 build. 2, Moscow, 115162, Russia 4 Department of Earth Sciences, 1272 University of Oregon, Eugene, OR 97403, USA 5 Geowissenschaftliches Zentrum Göttingen, Abteilung Geochemie, Universität Göttingen, Goldschmidtstraße 1 build. 2408, Göttingen, 37077, Germany * Corresponding author † Deceased","PeriodicalId":15957,"journal":{"name":"Journal of Geosciences","volume":"64 1","pages":"229-250"},"PeriodicalIF":1.4,"publicationDate":"2020-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44455992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Radiogenic heat production of Variscan granites from the Western Bohemian Massif, Germany","authors":"L. Scharfenberg, Anette Regelous, H. Wall","doi":"10.3190/jgeosci.293","DOIUrl":"https://doi.org/10.3190/jgeosci.293","url":null,"abstract":"Much of the Mid-European basement has been consolidated during the Variscan Orogeny and includes large volumes of granitic intrusions. Gamma radiation spectroscopic measurements in three study areas along the western margin of the Bohemian Massif give a record of radiogenic element concentrations in the Variscan granites. Most intrusions of the Fichtelgebirge (except for the Tin Granite) and intrusive complexes in the Bavarian Forest show Th/U ratios exceeding unity, most likely related to abundance of monazite. In contrast, some of the Oberpfalz granites located near the Saxothuringian–Moldanubian boundary (Flossenbürg, Steinwald and Friedenfels types) are characterized by higher uranium concentrations and thus Th/U < 1. The low Th/U ratios here are in agreement with a possible U mobilisation along the Saxothuringian–Moldanubian contact zone observed in previous studies. Heat production rates of granites in the three study areas vary between 3.9 and 8.9 µW/m 3 , with a mean of 4.9 µW/m 3 . This classifies the intrusions as moderate- to high-heat-producing granites. Considering the huge volume of granitic bodies in the Variscan crust of the Bohemian Massif, the contribution of in situ radiogenic heat production had to have a major impact and should be considered in further thermal modeling. contains on the surface heat flow. Hasterok and Chapman (2011) estimated that 26 % of the surface heat flow is generated by the upper continental crust. The new database GRAN-ITE2017 has been set up to compile available data on worldwide granitic terrains of all ages (Artemieva al. Based on statistical analysis, first conclusions have been made on variation of bulk heat production of granites through geological time. These results show a peak in the Middle Proterozoic times and a gradual decrease towards younger (Cenozoic) intrusions.","PeriodicalId":15957,"journal":{"name":"Journal of Geosciences","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2020-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43173284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Anorogenic Early Permian dykes in the western Mongolian Altai - petrography, geochemistry and K-Ar geochronology","authors":"V. Žáček, D. Buriánek, Z. Pécskay, R. Škoda","doi":"10.3190/JGEOSCI.280","DOIUrl":"https://doi.org/10.3190/JGEOSCI.280","url":null,"abstract":"A variety of felsic and mafic dykes grouped into swarms intruded the Lower Palaeozoic volcano-sedimentary sequences (flysch) and Late Devonian to Early Carboniferous plutonic rocks in the Hovd and Altai zones of the Central Asian Orogenic Belt (CAOB), western Mongolian Altai. The dykes reach a thickness of 0.5–20 m, length of approximately 50–2,500 m and strike mostly SW–NE or E–W. The felsic rocks chemically correspond to high-K calc-alkaline to alkaline rhyolites. Compositional trends of mafic rocks pass from alkalineand calc-alkaline basalts to trachyandesite. The bimodal nature of the association and the transitional calc-alkaline to alkaline character of the dykes indicate magma production through partial melting of the mantle and continental crust in an intra-plate (rift) geodynamic setting. The new conventional whole-rock K–Ar dating of mafic and felsic dykes yielded ages ranging from 300 ± 9 to 281 ± 9 Ma (1σ). This indicates anorogenic volcanic activity associated with Late Carboniferous to Early Permian extension coeval with magmatism in the Gobi–Altai Rift and in the adjacent parts of the Chinese Altai. The calculated crystallization pressures of 1–2 kbar and 0.3–0.4 kbar for felsic and mafic rocks, respectively, indicate emplacement at shallow levels.","PeriodicalId":15957,"journal":{"name":"Journal of Geosciences","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2019-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42062131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Zalužany - a circular structure in the Czech Republic accompanied by glass of granodiorite composition","authors":"S. Vrána, J. Mrlina, R. Škoda, P. Halodová","doi":"10.3190/JGEOSCI.281","DOIUrl":"https://doi.org/10.3190/JGEOSCI.281","url":null,"abstract":"The Hejný Pond, 500 × 400 m, southeast of the Zalužany village in central Bohemia, attracted attention as a possible impact structure. The pond has a notable bilateral symmetry with an axis oriented NW–SE, indicating a significant subhorizontal vector in the overall deformation pattern. A negative gravity anomaly elongated in the same direction (600 × 300 m) with the amplitude of –0.35 mGal was disclosed by detailed gravity survey. The incomplete ring of elevations suggests slightly uplifted basement segments with a diameter of 1 km. Search for glass and other possible indicators of shock metamorphism resulted in a find of glass fragments 22 to 37 mm across. The glass has composition comparable to the local Kozárovice hornblende–biotite granodiorite of the Central Bohemian Plutonic Complex. Unusual features include locally high contamination by iron (up to 10–13 wt. % FeOt) and abundant cristobalite. The absence of planar deformation features in quartz and feldspars together with the absence of platinum-group elements and Ni enrichment in local glass may be considered as obstacles in defining Zalužany as an impact structure. Although glass fragments are rare at the locality, and the considerable Quaternary erosion, the occurrence of rock inclusions in two of the fragments makes the Zalužany structure a promising object for future study.","PeriodicalId":15957,"journal":{"name":"Journal of Geosciences","volume":"1 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2019-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41937284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
P. Bačík, Jana Fridrichová, P. Uher, S. Rybár, V. Bizovská, J. Luptáková, Dana Vrablíková, L. Pukančík, T. Vaculovič
{"title":"Octahedral substitution in beryl from weakly fractionated intragranitic pegmatite Predné Solisko, Tatry Mountains (Slovakia): the indicator of genetic conditions","authors":"P. Bačík, Jana Fridrichová, P. Uher, S. Rybár, V. Bizovská, J. Luptáková, Dana Vrablíková, L. Pukančík, T. Vaculovič","doi":"10.3190/JGEOSCI.272","DOIUrl":"https://doi.org/10.3190/JGEOSCI.272","url":null,"abstract":"","PeriodicalId":15957,"journal":{"name":"Journal of Geosciences","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2019-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43846538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Trace-element chemistry of barren and ore-bearing quartz of selected Au, Au-Ag and Sb-Au deposits from the Bohemian Massif","authors":"K. Pacak, J. Zachariáš, L. Strnad","doi":"10.3190/JGEOSCI.279","DOIUrl":"https://doi.org/10.3190/JGEOSCI.279","url":null,"abstract":"The trace-element contents in gold-bearing and barren quartz veins from eight Au, Au–Ag and Sb–Au Variscan deposits in the Bohemian Massif have been determined in situ in order to evaluate the differences between the various types of gold deposits and discuss trace-element variations in the successive generations of quartz veins. The variability of Ti, Al, Ge, Li and Sb abundances obtained by Laser-Ablation Inductively-Coupled Plasma Mass Spectrometry (LA-ICP-MS) roughly correlates with the origin and the temperature of the mineralizing fluids. The Al content ranges up to 4020 ppm (median value 230 ppm), while the Li content is generally low (< 4 ppm). The elevated Sb content (30–360 ppm Sb) is only related to quartz that immediately preceded deposition of Sb-rich phases. The titanium content of the ore-bearing vein quartz follows bimodal distribution: gold deposits with assumed higher temperature (> 450 °C) formation exhibit higher median values (~10 ppm Ti) than medium-to-low (< 300 °C) temperature deposits (~2 ppm Ti). A statistically significant threshold value (8 ppm Ti) has been recognized as an empirical tool for discriminating between them. In terms of the Ti and Al contents, the studied Bohemian gold deposits fall within and in between fields of orogenic gold and porphyry deposit types.","PeriodicalId":15957,"journal":{"name":"Journal of Geosciences","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2019-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47906122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}