New insights into the Late Turonian of Bohemian Cretaceous basin: Sedimentary environment and possible Milankovitch-cycles-driven sea-level changes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F24%3A10169353" target="_blank" >RIV/00025798:_____/24:10169353 - isvavai.cz</a>

Výsledek na webu

<a href="https://geoklub.sk/herlany24/abstracts/ICYG_2024_Abstractbook.pdf" target="_blank" >https://geoklub.sk/herlany24/abstracts/ICYG_2024_Abstractbook.pdf</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

New insights into the Late Turonian of Bohemian Cretaceous basin: Sedimentary environment and possible Milankovitch-cycles-driven sea-level changes

Popis výsledku v původním jazyce

The Late Turonian period (Cretaceous, c. 91.3-89.75 Ma) is renowned for its role in cooling the supergreenhouse environment (e.g., Voigt and Wiese, 2002, Jarvis et el., 2015) and experiencing frequent transgressive-regressive episodes associated with climatically driven low-magnitude eustatic sea-level changes (e.g. Schulz and Schäfer-Neth, 1997; Miller et al., 2005; Uličný et al., 2014, Olde et al., 2015 and Plint et al., 2022). The formation of new basins in central Europe, including the Bohemian Cretaceous Basin, was facilitated by compressional stresses and the reactivation of inherited Variscan basement faults (Voigt et al. 2021). During the Turonian, the filling of the basin was characterised by repetitive progradation of deltaic bodies and coeval shorelines (Uličný 2001, Uličný et al., 2009). Recently, pronounced cyclicity in siliciclastic input was described in hemipelagic strata in the central part of the basin and interpreted as cycles of precession (18-23 kyr) modulated by c. 100 kyr eccentricity (Chroustová et al., 2021).Within this context, the study aims to elucidate sedimentological processes and stratigraphy in the Bohemian Cretaceous Basin in the Late Turonian, particularly focusing on the proximal area (covered by the Jizera Formation) and distal areas of the Jizera region. Through detailed proximal-distal correlation of thin (first metres) stratigraphic units between outcrops, borehole sections, and well logs, the study (1) extended the depositional system of Uličný (2001), when described regressive dune fields located at the shelf at the proximal areas and described the facies changes with rising distance from the sediment source. The interpreted overall regressive nature and filling of the accommodation space created a very shallow environment in the proximal areas with intense reworking and sediment bypass into distal areas. (2) The study tracked the Milankovitch-cycles-driven siliciclastic cyclicity in proximal areas of the Jizera region, where main transgressions are connected to eccentricity-modulated (100 kyr) precession-driven sea-level changes. (3) The study described tectonic activity at the Lužice thrust and at the Labe fault zone, which is probably a continuation of a tectonic event located at the Ohře platform (Laurin and Uličný, 2004). This work involved methods from sequence stratigraphy, (4) enabling the update of the genetic sequence stratigraphy of the Jizera Formation (subdivision of the TUR 5 unit sensu Uličný et al., 2009).

Název v anglickém jazyce

New insights into the Late Turonian of Bohemian Cretaceous basin: Sedimentary environment and possible Milankovitch-cycles-driven sea-level changes

Popis výsledku anglicky

The Late Turonian period (Cretaceous, c. 91.3-89.75 Ma) is renowned for its role in cooling the supergreenhouse environment (e.g., Voigt and Wiese, 2002, Jarvis et el., 2015) and experiencing frequent transgressive-regressive episodes associated with climatically driven low-magnitude eustatic sea-level changes (e.g. Schulz and Schäfer-Neth, 1997; Miller et al., 2005; Uličný et al., 2014, Olde et al., 2015 and Plint et al., 2022). The formation of new basins in central Europe, including the Bohemian Cretaceous Basin, was facilitated by compressional stresses and the reactivation of inherited Variscan basement faults (Voigt et al. 2021). During the Turonian, the filling of the basin was characterised by repetitive progradation of deltaic bodies and coeval shorelines (Uličný 2001, Uličný et al., 2009). Recently, pronounced cyclicity in siliciclastic input was described in hemipelagic strata in the central part of the basin and interpreted as cycles of precession (18-23 kyr) modulated by c. 100 kyr eccentricity (Chroustová et al., 2021).Within this context, the study aims to elucidate sedimentological processes and stratigraphy in the Bohemian Cretaceous Basin in the Late Turonian, particularly focusing on the proximal area (covered by the Jizera Formation) and distal areas of the Jizera region. Through detailed proximal-distal correlation of thin (first metres) stratigraphic units between outcrops, borehole sections, and well logs, the study (1) extended the depositional system of Uličný (2001), when described regressive dune fields located at the shelf at the proximal areas and described the facies changes with rising distance from the sediment source. The interpreted overall regressive nature and filling of the accommodation space created a very shallow environment in the proximal areas with intense reworking and sediment bypass into distal areas. (2) The study tracked the Milankovitch-cycles-driven siliciclastic cyclicity in proximal areas of the Jizera region, where main transgressions are connected to eccentricity-modulated (100 kyr) precession-driven sea-level changes. (3) The study described tectonic activity at the Lužice thrust and at the Labe fault zone, which is probably a continuation of a tectonic event located at the Ohře platform (Laurin and Uličný, 2004). This work involved methods from sequence stratigraphy, (4) enabling the update of the genetic sequence stratigraphy of the Jizera Formation (subdivision of the TUR 5 unit sensu Uličný et al., 2009).

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

10510 - Climatic research

Projekt

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Návaznosti

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

ICYG 2024 Abstract Book

ISBN

978-80-553-4738-7

ISSN

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e-ISSN

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Počet stran výsledku

2

Strana od-do

12-13

Název nakladatele

Technical University of Košice

Místo vydání

Herľany, Slovakia

Místo konání akce

Herľany, Slovakia

Datum konání akce

18. 4. 2024

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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