Article
Geosciences, Multidisciplinary
Leta Megerssa, Krystof Verner, David Burianek, Ondrej Pour, Filip Tomek, David Schiller, Karel Martinek
Summary: This paper presents new structural, anisotropy of magnetic susceptibility (AMS), and petrological data in tandem with existing geochronological data to determine a polyphase Variscan tectonometamorphic event in the southwestern Moldanubian Zone of the Bohemian Massif. The study reveals the successive tectonometamorphic evolution of high-grade metamorphic rocks in this area, highlighting three main geodynamic episodes: collisional to exhumation, late-orogenic shortening, and late-orogenic extension.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2023)
Article
Geochemistry & Geophysics
Vojtech Wertich, Martin Kubes, Jaromir Leichmann, Marketa Hola, Jakub Haifler, Juraj Mozola, Pavla Hrselova, Michal Jaros
Summary: This study analyzed the trace element compositions of unaltered uraninite samples from different ore fields in a uranium province. The results showed variations in trace element signatures among the samples, indicating the importance of physico-chemical conditions, lithological controls, and fluid-rock interaction processes in influencing the minor and trace element compositions of uraninite.
JOURNAL OF GEOCHEMICAL EXPLORATION
(2022)
Article
Geosciences, Multidisciplinary
Lukas Krmicek, Milan Novak, Robert B. Trumbull, Jan Cempirek, Stanislav Houzar
Summary: Various metacarbonate and calc-silicate rocks in the Bohemian Massif of the Variscan orogen contain tourmaline in different paragenetic settings, each showing distinctive compositional features. The presence of tourmaline with different B-isotope compositions in specific units suggests regional variations and possible metamorphic processes within the studied areas.
GEOSCIENCE FRONTIERS
(2021)
Article
Geochemistry & Geophysics
Tuhin Chakraborty, Steffen H. Buttner, Gelu Costin, Charles F. Kankuzi
Summary: Gem mineralization is found in Late-Pan-African granitic pegmatites in Malawi. The geochemical characteristics of these pegmatites, as well as the evolution of the forming melts, are described using major and trace element chemistry of mica and tourmaline. The results indicate that fractional crystallization is the dominant process in melt evolution, and gem mineralization is associated with highly fractionated pegmatites that are rich in incompatible elements.
MINERALIUM DEPOSITA
(2023)
Article
Geochemistry & Geophysics
Anna Pietranik, Federico Farina, Katarzyna Derkowska, Urs Schaltegger, Arkadiusz Przybylo, Craig Storey, Stephanie Lasalle, Bruno Dhuime, Magdalena Panczyk, Grzegorz Zielinski, Malgorzata Nowak, Kamil Bulcewicz, Jakub Kierczak
Summary: Amphibole- and clinopyroxene-bearing monzodiorites were emplaced at 340 Ma, indicating the existence of hydrous and dry magmas closely related in space and time. The analysis of hafnium and oxygen isotopes in zircon suggests that these rocks originated from a contaminated mafic magma derived from an enriched mantle. Zircon is proven to be an excellent tool for distinguishing between hydrous and anhydrous crystallization conditions. The study also proposes the involvement of fluid-present remelting of a mafic underplate in the formation of amphibole-bearing monzodiorites.
JOURNAL OF PETROLOGY
(2022)
Article
Geology
Zhengyu Long, Xiaoyan Yu, Yuyu Zheng
Summary: This study focuses on the petrological and geochemical analysis of tourmaline from the Dayakou emerald deposit to determine the source of ore-forming fluid and emerald genesis. Two types of tourmaline with distinct compositions were identified in this study, suggesting that the deposit is controlled by the fluid-rock interaction between the metamorphic basement and magmatic-hydrothermal fluids. The chemical composition and enrichment of certain elements in tourmaline could be used as exploration indicators for targeting emerald mineralization in the region.
ORE GEOLOGY REVIEWS
(2021)
Article
Geochemistry & Geophysics
Kristian Drivenes
Summary: Multiple generations and growth stages of tourmaline from a hydrothermal quartz-tourmaline rock in SW England were analyzed to understand the variation in tourmaline composition and specifically the distribution of Sn. The study demonstrated the suitability of quantitative X-ray mapping for identifying and quantifying minor elements.
JOURNAL OF GEOSCIENCES
(2022)
Article
Geochemistry & Geophysics
Marjorie Sciuba, Georges Beaudoin, Sheida Makvandi
Summary: Tourmaline from 18 orogenic gold deposits was analyzed using EPMA and LA-ICP-MS to establish geochemical features for indicator mineral surveys in gold exploration. The major element composition of tourmaline is influenced by hydrothermal fluids, while trace elements are controlled by country rock composition and metamorphic facies. Tourmaline from orogenic gold deposits has distinct elemental compositions compared to other deposit types.
MINERALIUM DEPOSITA
(2021)
Editorial Material
Geosciences, Multidisciplinary
Vojtech Janousek, Martin Svojtka
Summary: The re-evaluation of geological samples confirmed the emplacement age of the pluton and provided insights into the tectonic development of the region. The timing of the other intrusions remains open to further research and discussion.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2021)
Article
Geochemistry & Geophysics
Tom Jaroka, Jeorg A. Pfaender, Thomas Seifert, Folkmar Hauff, Blanka Sperner, Sebastian Staude, Tobias Stephan, Bernhard Schulz
Summary: The Lausitz Block in the northern Bohemian Massif contains dike-to-stock-shaped gabbroic intrusions that form two groups: Group I consists of hornblende-poor lithologies, while Group II consists of hornblende-rich lithologies. Some of these intrusions have small-scale Ni-Cu-(PGE) sulfide accumulations. The intrusions, which intruded Cadomian granodiorites during the Middle to Late Devonian, provide potential exploration targets for Ni-Cu deposits.
Article
Geochemistry & Geophysics
Wenbo Li, Xueyuan Qiao, Fanghua Zhang, Lejun Zhang
Summary: Research on tourmalines at the Bilihe porphyry gold deposit in Inner Mongolia, China, identified five types of tourmalines with distinct characteristics and elemental compositions. The tourmalines within different mineralization types exhibit unique features, possibly influenced by fluid composition and rock assimilation.
MINERALIUM DEPOSITA
(2022)
Article
Environmental Sciences
Jiri Krejsa, Jan Sima, Marek Kobera, Martin Seda, Lubomir Svoboda
Summary: Four macrofungi species with ecological relationship to birch were analyzed for the content of 21 elements in their fruiting bodies. The mycorrhizal forming edible fruiting bodies accumulated different elements compared to the parasitic ones used in alternative medicine, reflecting their different lifestyles.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Geochemistry & Geophysics
A-Bing Lin, Sonja Aulbach, Jian-Ping Zheng, Laura Uenver-Thiele, Alan B. Woodland, Hong-Fu Zhang
Summary: This study investigated the physicochemical evolution of lherzolitic and harzburgitic peridotites using trace element analysis of olivine and orthopyroxene. The results demonstrate that the trace element compositions of these minerals can provide valuable information about the evolution of the shallow subcontinental lithospheric mantle. The study also highlights the importance of using multiple thermometers and empirical corrections for accurate depth estimates in spinel-facies peridotites.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geosciences, Multidisciplinary
Matej Machek, Igor Soejono, Jiri Slama, Eliska Zackova
Summary: The high-grade metamorphic complexes along the northern Moldanubian periphery of the central Bohemian Massif provide a detailed structural record of the collisional evolution of the Variscan Orogeny. Multiple tectonic events were identified through the analysis of rock structures and microstructures, as well as geochronology.
JOURNAL OF THE GEOLOGICAL SOCIETY
(2022)
Article
Geochemistry & Geophysics
G. S. Pokrovski, C. Sanchez-Valle, S. Guillot, A. Y. Borisova, M. Munoz, A-L Auzende, O. Proux, J. Roux, J-L Hazemann, D. Testemale, Y. Shvarov
Summary: The redox dynamics of subduction processes remain poorly understood due to a lack of direct geochemical tracers. This study investigates the chemical and redox state of arsenic in serpentinites from the Tso Morari region, which are evidence of Himalayan subduction, using X-ray absorption spectroscopy. The findings reveal contrasting redox speciation of arsenic, from arsenide to arsenite and arsenate, allowing for reconstruction of the redox behavior of arsenic during subduction. The out-of-equilibrium release of highly oxidized fluids is reflected by the high As-V/As-III ratios observed. Arsenic in serpentinite is shown to be a sensitive record of subduction redox dynamics, providing valuable insights beyond traditional equilibrium approaches.
GEOCHEMICAL PERSPECTIVES LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Lukas Krmicek, Milan Novak, Robert B. Trumbull, Jan Cempirek, Stanislav Houzar
Summary: Various metacarbonate and calc-silicate rocks in the Bohemian Massif of the Variscan orogen contain tourmaline in different paragenetic settings, each showing distinctive compositional features. The presence of tourmaline with different B-isotope compositions in specific units suggests regional variations and possible metamorphic processes within the studied areas.
GEOSCIENCE FRONTIERS
(2021)
Article
Mineralogy
Rhiana E. Henry, Lee A. Groat, R. James Evans, Jan Cempirek, Radek Skoda
Summary: The study introduces equations that can be used to easily calculate the H2O content of emerald beryl with significant Na+ content based on either Na+ apfu or Na2O weight percent, offering a simple calculation method for future researchers.
CANADIAN MINERALOGIST
(2021)
Article
Geochemistry & Geophysics
Emily D. Scribner, Jan Cempirek, Lee A. Groat, R. James Evans, Cristian Biagioni, Ferdinando Bosi, Andrea Dini, Ulf Halenius, Paolo Orlandi, Marco Pasero
Summary: Magnesio-lucchesiite is a new mineral species of the tourmaline supergroup, characterized by black crystals with vitreous luster, estimated hardness of 7-8, and densities of 3.168 (Canada) and 3.175 g/cm(3) (Italy). Its crystal structure was refined, showing pleochroic properties and trigonal symmetry.
AMERICAN MINERALOGIST
(2021)
Article
Mineralogy
Jordan A. Roberts, Lee A. Groat, Paul G. Spry, Jan Cempirek
Summary: The Deer Horn deposit is a polymetallic system enriched in Au-Ag-Te with lesser amounts of Bi-Pb-W. A quartz-sulfide vein system and the nearby Eocene Nanika granodiorite intrusive suite are genetically related to the deposit. The deposit is characterized by tellurium-bearing minerals and Ag-rich gold.
CANADIAN MINERALOGIST
(2022)
Article
Geology
Sebastian Hreus, Jakub Vyravsky, Jan Cempirek, Karel Breiter, Michaela Vasinova Galiova, Ondrej Kratky, Vojtech Sesulka, Radek Skoda
Summary: Scandium, an important metal with strategic applications in high-tech alloys and solid oxide fuel cells, is primarily found in the Cinovec/Zinnwald deposit through minerals in greisen-type deposits. Zinnwaldite is the main carrier of scandium in most rock types, hosting up to 93% of the total scandium content. Younger fluids causing muscovitization of zinnwaldite and sulfidic alteration depleted scandium and redistributed it into secondary minerals.
ORE GEOLOGY REVIEWS
(2021)
Article
Geochemistry & Geophysics
Ferdinando Bosi, Federico Pezzotta, Alessandra Altieri, Giovanni B. Andreozzi, Paolo Ballirano, Gioacchino Tempesta, Jan Cempirek, Radek Skoda, Jan Filip, Renata Copjakova, Milan Novak, Anthony R. Kampf, Emily D. Scribner, Lee A. Groat, R. James Evans
Summary: Celleriite is a new mineral of the tourmaline supergroup, found in Italy and the Czech Republic, with violet to gray-blue or dark brownish-green color. It has high Mohs hardness and density, with a trigonal crystal structure.
AMERICAN MINERALOGIST
(2022)
Article
Mineralogy
Ferdinando Bosi, Federico Pezzotta, Henrik Skogby, Alessandra Altieri, Ulf Halenius, Gioacchino Tempesta, Jan Cempirek
Summary: Princivalleite is a new mineral belonging to the tourmaline supergroup, with a unique crystal structure and chemical composition, found in Italy.
MINERALOGICAL MAGAZINE
(2022)
Article
Mineralogy
Ferdinando Bosi, Cristian Biagioni, Federico Pezzotta, Henrik Skogby, Ulf Halenius, Jan Cempirek, Frank C. Hawthorne, Aaron J. Lussier, Yassir A. Abdu, Maxwell C. Day, Mostafa Fayek, Christine M. Clark, Joel D. Grice, Darrell J. Henry
Summary: Uvite is a new mineral belonging to the tourmaline supergroup, found in a narrow vein in Elba Island, Italy. It has a specific crystal structure and contains elements such as calcium, magnesium, aluminum, silicon, and boron. The formation of Uvite is related to the interaction between B-rich fluids and LCT pegmatites formed by magmatic processes.
MINERALOGICAL MAGAZINE
(2022)
Editorial Material
Geochemistry & Geophysics
J. Cempirek, F. Bosi, H. Marschall
JOURNAL OF GEOSCIENCES
(2022)
Article
Geochemistry & Geophysics
Lindsey Abdale, Philippe M. Belley, Lee A. Groat, Jan Cempirek, Radek Skoda, Corey Wall
Summary: The occurrence of sapphire (corundum) near Revelstoke, British Columbia, Canada, is found in the Monashee Complex of the Omineca Belt of the Canadian Cordillera. The sapphire occurs in boudins or pod-like zones of restite within a garnet-bearing leucosome. The peraluminous nature of the corundum-bearing pods indicates partial melting of a metapelitic protolith, which occurred during Cordilleran orogenesis.
Article
Mineralogy
Peter Bacik, Manfred Wildner, Jan Cempirek, Radek Skoda, Peter Cibula, Tomas Vaculovic
Summary: The presence and position of vanadium in tanzanite, a valuable variety of zoisite, were examined using structural refinement and optical absorption spectra analysis. The results suggest that vanadium is likely to occupy the M1,2 site, and can exist in both trivalent and four-valent states in the crystal structure of zoisite-tanzanite. （The presence and position of vanadium in tanzanite, a valuable variety of zoisite, were examined using structural refinement and optical absorption spectra analysis. The results suggest that vanadium is likely to occupy the M1,2 site, and can exist in both trivalent and four-valent states in the crystal structure of zoisite-tanzanite.）
MINERALOGICAL MAGAZINE
(2023)
Article
Mineralogy
Lenka Skrapkova, Jan Cempirek, Philippe M. Belley, Lee A. Groat, Radek Skoda
Summary: A rare oxy-dravite mineral was found in the Beluga occurrence in Nunavut territory, Canada. It occurs in a calc-silicate rock and commonly forms solid solutions with other minerals. The presence of oxy-dravite is related to metamorphism in the rock.
MINERALOGICAL MAGAZINE
(2023)
Article
Chemistry, Analytical
J. Vrabel, E. Kepes, P. Nedelnik, J. Buday, J. Cempirek, P. Porizka, J. Kaiser
Summary: The mutual incompatibility of distinct spectroscopic systems in laser-induced breakdown spectroscopy (LIBS) is a limiting factor that increases the cost of setting up a new LIBS system due to extensive calibration requirements. Solving this problem would enable inter-laboratory reference measurements and shared spectral libraries which are vital for other spectroscopic techniques. In this study, a simplified version of the challenge is addressed where LIBS systems only differ in the spectrometers used and collection optics, allowing the transfer of spectra between systems using a machine learning model composed of a variational autoencoder (VAE) and a multilayer perceptron (MLP).
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2023)
Article
Mineralogy
Rhiana E. Henry, Lee A. Groat, R. James Evans, Jan Cempirek, Radek Skoda
Summary: This study compares the crystal-chemical differences among different varieties of beryl by analyzing X-ray diffraction data and electron probe microanalyses. The results show that beryl varieties can be divided into two groups based on their sodium (Na) content, with different dominant cation substitutions at octahedral or tetrahedral sites. Equations and recommendations are determined to relate the Na and H2O content in emerald, aquamarine, goshenite, and morganite.
CANADIAN MINERALOGIST
(2022)
Article
Geochemistry & Geophysics
Pavlina Radkova, Milan Novak, Jan Cempirek, Stanislav Houzar, Radek Skoda
Summary: The banded carbonatite-like marbles from the Blizna graphite mine in the Cesky Krumlov Unit, Moldanubian Zone contain distinct mineral assemblages of amphiboles and diopside. These mineral assemblages show enrichment in carbonatite elements and exhibit complex textural relations, with amphibole species crystallizing in various stages. The composition of amphiboles and pyroxenes suggests an alkaline environment for their formation, indicating potential origins of the carbonatite-like marble from metacarbonates, alkaline volcanodetritic components, metamorphosed carbonatites, or Na-rich metasomatites.
JOURNAL OF GEOSCIENCES
(2021)
