A5015269352- Paleontology and Stratigraphy of Fossils
- Geology and Paleoclimatology Research
- Geological and Geochemical Analysis
- Geochemistry and Elemental Analysis
- Hydrocarbon exploration and reservoir analysis
- Marine Biology and Ecology Research
- Geological Formations and Processes Exploration
- Methane Hydrates and Related Phenomena
- Marine and coastal plant biology
- Coral and Marine Ecosystems Studies
- Mercury impact and mitigation studies
- Paleontology and Evolutionary Biology
- Cephalopods and Marine Biology
- Geological formations and processes
- Maritime and Coastal Archaeology
- Ancient and Medieval Archaeology Studies
- Geology and Environmental Impact Studies
- Evolution and Paleontology Studies
- Marine animal studies overview
- Environmental Impact and Sustainability
- Building materials and conservation
- Isotope Analysis in Ecology
- Botany and Plant Ecology Studies
- Language and Culture
- Geological Studies and Exploration
University of Silesia in Katowice
2015-2024
Silesian University in Opava
2018
Research Article| April 26, 2018 Mercury enrichments and the Frasnian-Famennian biotic crisis: A volcanic trigger proved? Grzegorz Racki; Racki * 1Faculty of Earth Sciences, University Silesia, ul. Będzińska 60, 41-200 Sosnowiec, Poland *E-mail: racki@us.edu.pl Search for other works by this author on: GSW Google Scholar Michał Rakociński; Rakociński Leszek Marynowski; Marynowski Paul B. Wignall 2School Leeds, Woodhouse Lane, Leeds LS2 9JT, UK Geology (2018) 46 (6): 543–546....
Abstract Precise U–Pb zircon dates from three volcanic ash beds that bracket the Hangenberg Shale in Holy Cross Mountains, Poland, constrain age and duration of one most significant palaeobiological events Palaeozoic Era, Event. It is linked to a terminal Devonian global shift greenhouse icehouse climate conditions, transgression, widespread black shale deposition. Our results Event between 358.97 ± 0.11 Ma 358.89 0.20 Ma, with calculated 0.05 +0.14/−0.05 Ma. A third, underlying bed yielded...
A wide range of various proxies (e.g., mineralogy, organic carbon, inorganic geochemistry, C and Mo isotopes, framboidal pyrite) were applied for interpretation changing oceanic redox conditions, bioproductivity, the regional history magmatic activity. This resulted in internally consistent late Famennian Hangenberg Crisis subtropical deepest water sites epeiric Rhenohercynian Saxo–Thuringian basins, as well more open Paleo-Tethys Ocean. High mercury concentrations detected all studied...
The Latest Devonian Hangenberg Event (ca.359 Ma) was one of the largest crises biosphere. It directly responsible for extinction about 50 % marine genera mainly from pelagic realm such as ammonoids, conodonts and placoderm fish. This is linked to worldwide anoxia caused by global climate changes, but its direct cause remains unidentified still a topic many scientific studies. Recently discovered mercury spikes, detected at D/C boundary in parts world, present convincing evidence increased...
Abstract The end-Devonian global Hangenberg event (359 Ma) is among the most devastating mass extinction events in Earth’s history, albeit not one of “Big Five”. This linked to worldwide anoxia caused by climatic changes. These changes could have been driven astronomical forcing and volcanic cataclysm, but ultimate causes still remain unclear. Here we report anomalously high mercury (Hg) concentration marine deposits encompassing from Italy Austria (Carnic Alps). recorded sections...
Recently, the end-Devonian mass extinction (Hangenberg Crisis, 359 Ma) was identified as a first-order extinction, albeit not one of "Big Five" events. Many marine and terrestrial organisms were affected by this crisis. The cause is still conjectural widely discussed. Here we report anomalously high mercury (Hg) concentrations from South Tian Shan (Uzbekistan), together with correlation using conodont biostratigraphic data. Hg enrichment (to 5825 ppb) detected in deposits encompassing...
Anom a lous Up per De vo nian mer cury en rich ments: com par i son of In ductively Cou pled Plasma -Mass Spec trom e try (ICP-MS) and Atomic Ab sorp tion (AAS) an lyt cal data.Geo log -
A rich and diverse assemblage of arthropods non-biomineralized macroalgae occurs in the Upper Devonian marine deposits Holy Cross Mountains, central Poland. The phrase Kowala Lagerstätte is herein proposed for fossil-bearing confined to lower Famennian marly shale limestone succession famous Quarry. arthropod fauna represented by phosphatic exoskeletal remains that still preserve fine micro-ornamentation cuticle. includes crustaceans crustacean-like taxa such as thylacocephalans,...
Abstract Widespread marine anoxia triggered by the runoff and recycling of nutrients was a key phenomenon associated with Frasnian–Famennian (FF) mass extinction. However, relative importance global‐scale processes versus local influences on site‐specific environmental change remains poorly understood. Here, nitrogen‐isotope (δ 15 N) trends are combined organic‐biomarker, phosphorus, Rock‐Eval data in FF sites from USA (H‐32 core, Iowa), Poland (Kowala Quarry), Belgium (Sinsin). Up‐to‐date...
The Cretaceous provides us with an excellent case history of ocean-climate-biota system perturbations. Such perturbations occurred several times during the Cretaceous, such as oceanic anoxic events and end-Cretaceous mass extinction, which have been subject abundant literature. Other perturbations, mid-Maastrichtian Event (MME) remain poorly understood. MME was associated global sea-level rise, changes in climate deep-water circulation that were accompanied by biotic extinctions including...
The pyrite framboid diameter and the extractable organic matter from Middle Famennian rhythmic succession of limestones, nodular limestones marly shales with pyritized fauna (KPG horizon) Holy Cross Mountains (Poland) were analyzed in order to constrain water column structure during their deposition. In all samples investigated, small framboids (<5 μm) that may have formed occur but majority larger diameters, characteristic for formation within sediments, below an oxic or dysoxic column....
Abstract In this study we focused on the dynamics of encrusting assemblages preserved brachiopod hosts collected from upper Frasnian and lower Famennian deposits Central Devonian Field, Russia. Because encrusted brachiopods come bracketing Frasnian/Famennian (F/F) boundary, results also shed some light ecological differences in communities before after Frasnian–Famennian (F-F) event. To explore diversity assemblages, analyzed more than 1300 valves (substrates) two localities. Taxon...
Integrated biostratigraphical, microfacial and geochemical studies of the Lower Kellwasser Event in Płucki succession (southern Poland) provide details about redox conditions during deposition this horizon deep-shelf Łysogóry basin Holy Cross Mountains. The environment is characterized by calm sedimentation soft, muddy carbonate substrate. However, microfacies changing from wackestones to grainstones, presence crushed or current-oriented nautiloid shells occurrence redeposited material...