Article
Geosciences, Multidisciplinary
Stephen Collett, Karel Schulmann, Pierig Deiller, Pavla Stipska, Vit Peresty, Marc Ulrich, Yingde Jiang, Luc de Hoym de Marien, Jitka Mikova
Summary: This article investigates the high-pressure and high-temperature metamorphism during the Mid-Devonian period in the Variscan Orogeny, focusing on the geological characteristics of the Marianske Lazne Complex (MLC). The unique position of MLC at the base of its original upper plate is highlighted. The study reveals that both MLC and the upper plate developed above a relatively unaltered Neoproterozoic lithospheric mantle, which is important for reconstructing the original architecture of the Variscan terranes.
GEOSCIENCE FRONTIERS
(2022)
Article
Geosciences, Multidisciplinary
Pierig Deiller, Pavla Stipska, Marc Ulrich, Karel Schulmann, Stephen Collett, Vit Peresty, Bradley Hacker, Andrew Kylander-Clark, Hubert Whitechurch, Ondrej Lexa, Eric Pelt, Jitka Mikova
Summary: The study examined previously unrecognized mafic and felsic plutonic rocks, as well as a possible upper-crustal equivalent, in the Bohemian Massif. The rocks exhibited evidence of active margin magmatism and Mid-Devonian magmatism, with a three-stage geodynamic model proposed to explain their formation. The magmatic rocks recorded a Mid-Devonian magmatic arc related to the subduction wedge beneath the upper plate.
Article
Geosciences, Multidisciplinary
Jacek Szczepanski, Gabriela Kaszuba, Robert Anczkiewicz, Slawomir Ilnicki
Summary: The Kamieniec Metamorphic Belt and the Doboszowice Metamorphic Complex provide valuable insights into the evolution of the early Palaeozoic Gondwana margin. Through the analysis of zircon ages and rock compositions, it is evident that the rocks in these areas originated from the Cadomian orogen and were deposited in basins formed on the Gondwana margin. The results suggest a connection between the eastern part of the Fore-Sudetic Block and the Trans-Saharan Belt or West African Craton, indicating that it was part of the Gondwana shelf. The closure of the Rheic Ocean is not responsible for the suture separating the Brunovistulian domain from the rest of the Gondwana-derived terranes.
GEOLOGICAL MAGAZINE
(2023)
Article
Geosciences, Multidisciplinary
Medard Thiry, Christine Franke, Kouakou F. E. Yao, Adam Szuszkiewicz, Carles Fabrega, Maria Jelenska, Magdalena Kadzialko-Hofmokl, Andrey Gurenko, David Parcerisa, Artur Sobczyk, Krzysztof Turniak, Pawel Aleksandrowski
Summary: The reddened granitoid facies in the basement of the Polish Sudetes show two categories of alteration associated with fractures: (1) saussuritization and sericitization within light-colored facies in the interior of fracture-bounded blocks, and (2) albitization and hematization in reddened facies adjacent to fracture walls. These alterations are linked to the chloritization of primary ferromagnesian minerals and the development of secondary minerals. The recognition of these weathering profiles over extensive parts of the Variscan Belt provides important information for understanding the post-Variscan paleosurface and Triassic geodynamics in Europe.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2023)
Article
Geology
Jan Wierchowiec, Stanislaw Z. Mikulski, Krzysztof Zielinski
Summary: Utilizing representative ore samples from the placer gold deposit, this study investigated the formation process of native gold particles, as well as the possible supergene transformations that occurred over historic periods. Different types of ore particles and evidence of native gold formation were discovered, leading to the proposal that these particles were formed in situ.
ORE GEOLOGY REVIEWS
(2021)
Article
Geosciences, Multidisciplinary
Stephen Collett, Pavla Stipska, Karel Schulmann, Jitka Mikova, Alfred Kroener
Summary: The study of the Velke Vrbno Dome eclogite provides evidence for the emplacement of eclogite protoliths in a transitional supra-subduction to continental-rift setting. Additionally, the discovery of a fragment of Palaeoproterozoic basement in the region suggests an earlier geological history.
JOURNAL OF THE GEOLOGICAL SOCIETY
(2021)
Article
Geology
Zhekai Zhou, Huan Li, Hengrui Zhu, Majid Ghaderi, Liming Ouyang
Summary: This study examines the zircons in typical ore samples from the Xikuangshan and Woxi deposits in the Xiangzhong metallogenic province, South China, using trace element, U-Pb dating, and Hf isotopic analysis. The results provide new insights into the sources and processes of metal and fluid in these deposits. The zircons in samples from the Xikuangshan deposit have similar U-Pb age distributions with their host and basement rocks, while the zircons from the Woxi deposit have younger U-Pb ages associated with contemporaneous magmatism in South China. The differences in mineralization processes between the two deposits are reflected in the alteration degree and elemental concentrations of zircons. The sources of zircons and mineralizing material are distinct for the Xikuangshan and Woxi deposits, with the former originating from basement rocks and the latter from magmatism.
ORE GEOLOGY REVIEWS
(2023)
Article
Geosciences, Multidisciplinary
Stephen Collett, Stanislaw Mazur, Karel Schulmann, Igor Soejono
Summary: New geochemical data suggests a change in the provenance of sedimentary rocks on the southern margin of Baltica during the late Neoproterozoic to early Paleozoic. This indicates the presence of a cryptic active margin along the periphery of southern Baltica. These findings have significant implications for our understanding of the supercontinent cycle.
PRECAMBRIAN RESEARCH
(2022)
Article
Geochemistry & Geophysics
Jacek Szczygiel, Artur Sobczyk, Helena Hercman, Maciej J. Mendecki, Michal Gasiorowski
Summary: The study used U-series methods to date multiphase speleothem damage and passage collapse in Niedzwiedzia Cave in Poland, revealing earthquakes as the most likely trigger of cave damage. The research highlights the advantage of employing speleoseismology in regions with moderate seismic activity.
Article
Geosciences, Multidisciplinary
S. De Clercq, D. Chew, G. O'Sullivan, T. De Putter, J. De Grave, S. Dewaele
Summary: The KAB region in Central Africa is characterized by the poorly understood Karagwe-Ankole belt (KAB), which contains various generations of granites with hypotheses regarding their emplacement. The youngest generation of granites, G4, are associated with Sn-W-Ta ore deposits and are considered to be parental granites. Through geochemical analysis and U-Pb zircon dating, it was found that G4 granites contain xenocrystic zircon, indicating inheritance of older granites or basement rocks. The geochemical variability and presence of xenocrystic zircons suggest localized melting from a heterogeneous source, favoring an intracontinental setting.
PRECAMBRIAN RESEARCH
(2021)
Article
Geography, Physical
Pei-yuan Hu, Qing-guo Zhai, Guo-chun Zhao, Jun Wang, Yue Tang, Zhi-cai Zhu, Wei Wang, Hao Wu
Summary: The study focused on gneissic granites in the Amdo microcontinent in central Tibetan Plateau, revealing Cambrian ages of around 500 Ma. Geochemical analysis showed that these granites belong to high-K calc-alkaline I-type granitoids, potentially formed through partial melting of ancient crustal materials influenced by mantle-derived magmas.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
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
Engineering, Geological
Jan Lenart, Martin Kasing, Tomas Panek, Regis Braucher, Frantisek Kuda
Summary: This research investigates the slow-moving rockslide phenomenon in the Thaya River canyon, Central Europe. By combining geomorphological research with geological structure analysis and terrestrial cosmogenic nuclide dating, it is found that the rockslide developed gradually over time and left long-lasting topographic features.
Article
Geochemistry & Geophysics
Daria Zaccaria, Noemi Vicentini, Maria Grazia Perna, Gianluigi Rosatelli, Victor V. Sharygin, Emma Humphreys-Williams, Will Brownscombe, Francesco Stoppa
Summary: This study presents new data on discrete zircons from the Veneto area, revealing their potential origin and significance. The research suggests a genetic link between these zircons and alkaline magmatic events, highlighting their geological importance and commercial potential.
Review
Geosciences, Multidisciplinary
Ed Landing, J. Duncan Keppie, D. Fraser Keppie, Gerd Geyer, Stephen R. Westrop
Summary: Avalonia is a distinctive region defined by unique uppermost Ediacaran-Ordovician rocks. It has been determined that Avalonia was an insular microcontinent rather than a part of Gondwana, with its origin and movement linked to the Avalonian transform fault (Atf). This finding challenges previous paleogeography and plate tectonics models.
EARTH-SCIENCE REVIEWS
(2022)
Article
Geosciences, Multidisciplinary
Arkadiusz Derkowski, Jan Srodon, Magdalena Goryl, Leszek Marynowski, Marek Szczerba, Stanislaw Mazur
Summary: The study examined the diagenetic history of Ediacaran sedimentary rocks in the East European Craton using XRD characterization, K-Ar dating, mudstone porosity measurements, and organic geochemistry investigations. The results revealed differences in burial depth and diagenetic advancement between the cratonic core and margin, with older ages generally observed in the north. The findings suggest short-lasting pulses of potassium-bearing hot fluids influenced illitization in porous rocks without altering organic matter, leading to unique diagenetic patterns in the region.
Article
Geology
Jacek Szczepanski, Xin Zhong, Marcin Dabrowski, Haozheng Wang, Marcin Golen
Summary: The Kamieniec Metamorphic Belt in the NE part of the Bohemian Massif is a supracrustal succession dominated by micaschists that has not been recognized as a high-P, low-T metamorphic unit. Investigation of samples from the belt reveals high-pressure metamorphism followed by a low-pressure event, typical for subduction systems. This suggests that the belt likely represents fragments of the Saxothuringian crust affected by cold extrusion within a tectonic model involving multiple domains in the Bohemian Massif.
JOURNAL OF METAMORPHIC GEOLOGY
(2022)
Article
Geochemistry & Geophysics
Tomas Proisl, Rostislav Melichar
Summary: Joints and fault surfaces significantly affect rock cohesion and exhibit anisotropy in shear strength. The study found that different types of ruptures have distinct patterns in shear strength distribution.
ACTA GEODYNAMICA ET GEOMATERIALIA
(2022)
Article
Geochemistry & Geophysics
Jacek Szczepanski, Marcin Golen
Summary: The reform of the steel industry is crucial for improving technological levels, product quality, and market competitiveness. To ensure the effective implementation of the reform, attention should be paid to the development of emerging industries, technological innovation, industrial structure adjustment, and sustainable economic development.
Article
Geosciences, Multidisciplinary
Grzegorz Rackim, Stanislaw Mazur, Katarzyna Narkiewicz, Agnieszka Pisarzowskal, Waldemar Bardzifiskil, Katarzyna Koltonik, Dawid Szymanowski, Pawel Filipiakl, Barbara Kremer
Summary: This article describes a tephra-rich cherty-clayey Famennian succession in the Bardo Mountains in the Sudetes of Poland, which preserves the record of a lost ocean that was later incorporated into the Variscan orogenic belt. The study reveals the interplay between biosiliceous and siliciclastic deposition in the oceanic basin, influenced by fluctuating but mostly oligotrophic regimes and weak up-welling. It also identifies the presence of Hangenberg Black Shale and provides insights into the tectonic processes and volcanic activity in the region.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2022)
Article
Geochemistry & Geophysics
Tomasz Janik, Dariusz Wojcik, Malgorzata Ponikowska, Stanislaw Mazur, Tymon Skrzynik, Michal Malinowski, Christian Huebscher
Summary: This paper presents a refraction/wide-angle reflection profile in the southern Baltic Sea across the Teisseyre-Tornquist Zone, providing insights into the structure and thickness of crustal layers and sedimentary cover in the region.
Article
Geosciences, Multidisciplinary
Stanislaw Mazur, Jaroslaw Majka, Christopher J. Barnes, William McClelland, Michal Bukala, Marian Janak, Karolina Kosminska
Summary: This study used 40Ar/39Ar dating to determine the ages of white mica in the Caledonian orogen of NW Svalbard. The results reveal that the oldest age represents the cooling age, while the other ages indicate the timing of subsequent deformation associated with the Caledonian nappe stack.
Article
Geography, Physical
Ivo Baron, Lukas Plan, Bernhard Grasemann, Rostislav Melichar, Ivanka Mitrovic Woodell, Matt Rowberry, Denis Scholz
Summary: This paper presents spectacular geomorphic evidence of recent tectonic activity and three potentially strong prehistoric earthquakes discovered in Obir Caves. The study reveals that at least three distinct seismotectonic events caused significant rock weakening and the formation of deep-seated gravitational slope deformation.
Article
Geosciences, Multidisciplinary
K. Kolarova, J. Cerny, R. Melichar, P. Schnabl, K. Gaidzik
Summary: The Upper Cambrian Krˇivokl'at-Rokycany Volcanic Complex was reconstructed using anisotropy of magnetic susceptibility (AMS). The study identified the feeding area of the volcanic complex, as well as the presence of andesite and rhyodacite feeders. The analysis also suggested that magnetic susceptibility increases with distance from the feeder and towards the upper part of the lava flow.
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2022)
Review
Geochemistry & Geophysics
Waldemar Jozwiak, Krzysztof Nowozynski, Stanislaw Mazur, Maciej Jez
Summary: This paper presents a 3-D model of resistivity distribution in the European lithosphere at the junction between different geological regions. The model is obtained by inverting magnetotelluric and geomagnetic deep sounding data. The results show variations in sedimentary layer thickness and the presence of deep and extensive conductive anomalies in the crust. The study highlights the role of early and relatively young tectonic processes in the evolution of the region.
SURVEYS IN GEOPHYSICS
(2022)
Article
Engineering, Geological
Ivo Baron, Pavel Koktavy, Tomas Trcka, Matt Rowberry, Josef Stemberk, Jan Balek, Lukas Plan, Rostislav Melichar, Gerhard Diendorfer, Robert Macku, Pavel Skarvada
Summary: This study investigates the effects of brittle rock strain and microcracking on earthquakes through monitoring electromagnetic radiation, and finds a strong correlation between high energy broadband impulses and lightning activity, as well as a relationship between low energy broadband impulses and local rock strain.
ENGINEERING GEOLOGY
(2022)
Article
Multidisciplinary Sciences
Jacek Szczygiel, Ivo Baron, Rostislav Melichar, Lukas Plan, Ivanka Mitrovic-Woodell, Eva Kaminsky, Denis Scholz, Bernhard Grasemann
Summary: By analyzing the paleostress of reactivated faults in caves near major faults, this study fills the knowledge gap of the post-Miocene evolution of the Northern Calcareous Alps (NCA). The results suggest that the NCA has experienced compression from the south to northeast since the Pliocene.
SCIENTIFIC REPORTS
(2022)
Article
Geosciences, Multidisciplinary
Stephen Collett, Stanislaw Mazur, Karel Schulmann, Igor Soejono
Summary: New geochemical data suggests a change in the provenance of sedimentary rocks on the southern margin of Baltica during the late Neoproterozoic to early Paleozoic. This indicates the presence of a cryptic active margin along the periphery of southern Baltica. These findings have significant implications for our understanding of the supercontinent cycle.
PRECAMBRIAN RESEARCH
(2022)
Article
Multidisciplinary Sciences
L. Marecek, R. Melichar, J. Cerny, P. Schnabl, K. Hrdlickova, D. Burianek
Summary: The Variscan orogen in Europe abruptly changes its course from SW-NE to N-S at its eastern margin due to oblique convergence. The Moldanubian Thrust, a major suture in this area, is characterized by dominant dextral strike-slip kinematics and a minor thrust component. Through the study of small-scale structures and the anisotropy of magnetic susceptibility, two deformations were identified: dextral simple shearing and drag folding. The oblique convergence led to non-coaxial deformations, resulting in the formation of an overturned large-scale synformal fold structure in the footwall and an antiformal structure in the hanging wall of the Moldanubian Thrust.
SCIENTIFIC REPORTS
(2023)
Article
Geochemistry & Geophysics
Piotr Krzywiec, Mateusz Kufrasa, Pawel Poprawa, Stanislaw Mazur, Malgorzata Koperska, Piotr Slemp
Summary: This study uses seismic data to model the geological evolution of Northwest Poland, revealing multiple extension and inversion events in the crust from the late Paleozoic to the present. The findings are significant for understanding the tectonic evolution of this region.
