A5042022165- Paleontology and Stratigraphy of Fossils
- Geology and Paleoclimatology Research
- Geological Formations and Processes Exploration
- Marine Biology and Ecology Research
- Geological and Geochemical Analysis
- Geochemistry and Elemental Analysis
- Mollusks and Parasites Studies
- Isotope Analysis in Ecology
- Hydrocarbon exploration and reservoir analysis
- Paleontology and Evolutionary Biology
- Astro and Planetary Science
- Geological formations and processes
- Mineralogy and Gemology Studies
- Geological Studies and Exploration
- Marine Biology and Environmental Chemistry
- Crystal Structures and Properties
- Evolution and Paleontology Studies
- Calcium Carbonate Crystallization and Inhibition
- Clay minerals and soil interactions
- High-pressure geophysics and materials
- Geochemistry and Geologic Mapping
- Space Exploration and Technology
- Radioactive element chemistry and processing
- Cephalopods and Marine Biology
- Botany and Plant Ecology Studies
Czech Geological Survey
2015-2024
Czech University of Life Sciences Prague
2015-2024
Charles University
2016
Czech Academy of Sciences, Institute of Geology
2016
University of Portsmouth
2011-2015
Masaryk University
2015
Freie Universität Berlin
2004-2013
Czech Academy of Sciences, Institute of Inorganic Chemistry
2013
University of Zurich
2013
Natural History Museum
2013
Klug, C., Kroger, B., Kiessling, W., Mullins, G.L., Servais, T., Frýda, J., Korn, D. & Turner, S. 2009: The Devonian nekton revolution. Lethaia, 10.1111/j.1502-3931.2009.00206.x Traditional analyses of Early Phanerozoic marine diversity at the genus level show an explosive radiation life until Late Ordovician, followed by a phase erratic decline continuing end Palaeozoic, whereas more recent analysis extends duration this early into Devonian. This catch-all approach hides evolutionary and...
Abstract The second pulse of the Late Ordovician mass extinction occurred around Hirnantian-Rhuddanian boundary (~444 Ma) and has been correlated with expanded marine anoxia lasting into earliest Silurian. Characterization Hirnantian ocean anoxic event focused on onset anoxia, global reconstructions based carbonate δ 238 U modeling. However, there have limited attempts to quantify uncertainty in metal isotope balance approaches. Here, we probabilistically evaluate coupled isotopes...
SUMMARY The size of early ontogenetic shells (protoconchs) ancient benthic molluscs suggests that feeding larvae occurred at about 490 myr (approximately, transition from Cambrian to Ordovician). Most studied Ordovician protoconchs were smaller than ones, indicating eggs and hatchlings. This substitution nutritious reserve matter such as yolk by plankton an energy source for larvae. observed change represents the first direct empiric evidence a late switch planktotrophy in invertebrate It...
ABSTRACT The prominent felsic granulites in the southern part of Bohemian Massif (Gföhl Unit, Moldanubian Zone), with Variscan (∼340 Ma) high-pressure and high-temperature assemblage garnet+quartz+hypersolvus feldspar ± kyanite, correspond geochemically to slightly peraluminous, fractionated granitic rocks. Compared average upper crust most granites, U, Th Cs concentrations are strongly depleted, probably because fluid and/or slight melt loss during high-grade metamorphism (900–1050°C,...
Abstract A multidisciplinary correlation of the Devonian–Carboniferous (D–C) boundary sections from Moravian Karst (Czech Republic) and Carnic Alps (Austria), based on conodont foraminifer biostratigraphy, microfacies analysis, field gamma-ray spectroscopy (GRS), carbon isotopes element geochemistry, is presented in this paper. The study focused interval Middle Palmatolepis gracilis expansa Zone (Late Famennian) to Siphonodella sandbergi (Early Tournaisian). In Lesní lom (Moravian Karst), a...
Diversity evolution of 197 the latest Ludlow-Lochkovian cephalopod species from Bohemia (representing more that 70 percent all known worldwide) was analysed and compared with changes in global carbon cycle marine ecosystem.Our results show a distinct relationship between diversity cycle.A progressive increase δ 13 C values carbonates Monograptus lochkoviensis Zone to end transgrediens reflects an bioproductivity ecosystem.This probably caused by shallowing upwelling system, thus importing...
This study investigates calcium isotope variations (δ44/40Ca) in late Silurian marine carbonates deposited the Prague Basin (Czech Republic), which records one of largest positive carbon excursion (CIE) entire Phanerozoic, mid-Ludfordian CIE, is associated with major climatic changes (abrupt cooling) and global sea-level fluctuations. Our results show that during onset when δ13C increases rapidly from ∼0‰ to ∼8.5‰, δ44/40Ca remains constant at about 0.3±0.1‰ (relative NIST 915a), while...
The Podlesí granite stock in the western Krušné Hory (Erzebirge) Mountains, Czech Republic, represents an extremely fractionated, strongly peraluminous, F- and P-rich, rare-metal system of Late Variscan age. stock, studied drill core 300 m length, is formed by albite–protolithionite–topaz ('stock granite', depth 30–300 m) shows geochemical textural zoning. rich P (∼0.5 wt %), F (0.5–1.2 Rb (∼1000 ppm), Li (500–1000 ppm) Cs (100–150 ppm, poor Ti, Mg, Fe, Ca, Sr, Ba, Zr rare earth elements...
Data are presented from the Batra Formation (also known as Mudawwara Shale Formation) of a core well BG‐14 in Batna el Ghoul area, southern Jordan, which enable new depositional model to be proposed for middle Rhuddanian (lower Llandovery, Silurian) “hot shale” may applicable other Arabian and North African shales” similar stratigraphical age. This probably results rapid early burial organic carbon associated with minor regression during anoxic bottom conditions were maintained most, but not...
Abstract The shale-dominated hemipelagic succession exposed in the southwestern part of Prague Synform preserves most complete Ludfordian graptolite record so far encountered from peri-Gondwanan Europe. Four biozones – Neocucullograptus inexpectatus , Nc. kozlowskii Pseudomonoclimacis latilobus–Slovinograptus balticus and Pristiograptus fragmentalis are recognized middle late Ludfordian, between Bohemograptus tenuis Biozone base Pridoli Series. Conodont occurrences restricted to scattered...
Petrophysical (gamma-ray spectrometry, magnetic susceptibility) and geochemical (X-ray fluorescence spectrometry inorganic carbon isotope geochemistry) methods are used for stratigraphic correlations palaeoenvironmental interpretations of the Devonian-Carboniferous boundary interval in northern part Rheinisches Schiefergebirge, Germany.Sections at Oese, Oberrödinghausen Drewer were studied range from Famennian Upper expansa Zone to Tournaisian Lower crenulata Zone.The Wocklum Limestone...