Beginning of the Miocene Climatic Optimum in Central Europe in sediment archive of the Most Basin, Czech Republic

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388980%3A_____%2F21%3A00539973" target="_blank" >RIV/61388980:_____/21:00539973 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61989592:15310/21:73610052 RIV/00025798:_____/21:00000157

Výsledek na webu

<a href="http://hdl.handle.net/11104/0317655" target="_blank" >http://hdl.handle.net/11104/0317655</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3140/bull.geosci.1794" target="_blank" >10.3140/bull.geosci.1794</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Beginning of the Miocene Climatic Optimum in Central Europe in sediment archive of the Most Basin, Czech Republic

Popis výsledku v původním jazyce

The Most Basin (Czech Republic) offers an extraordinarily detailed archive of the continental environment in Central Europe (ca. 50 degrees N) in the period around the beginning of the Miocene Climatic Optimum. The sediments were studied by magneto-, chemo-, and cyclostratigraphy. Novel proxies for chemical weathering intensity were derived from K/Al concentration ratios and Mg/Al concentration ratios corrected for autochthonous carbonate content using an isometric log-ratio methodology and robust regression (RR). The correction confirmed that the association of chemical weathering maxima (lows in K/Al or Mg/Al) with eccentricity, obliquity, or precession maxima were affected by sediment grain size to only a minor degree. The orbital control allowed for the refinement of a magnetic-polarity-based depth-age model to unprecedented resolution. The timing of the basin development after the peat swamp flooding was confirmed, it started in the C5Dr.2r subchron, intensified in the C5Dn.1n subchron over several tens of kyr, and spread over the entire basin in the early part of C5Dr.1r. The expression of orbital cycles in weathering proxies changed abruptly near 17.07 and 16.90 Ma, in close temporal proximity to two step-like changes in global marine delta O-18 records between 17.2 and 16.9 Ma. The sensitivity of weathering intensity in the Most Basin to orbital forcing decreased coevally with the initial floods of the Columbia River Basalt Group and disruptions of the global delta C-13 record near the C5Dr/C5Dn reversal at around 16.6 Ma. Ratios K/Al and Mg/Al, either raw or carbonate corrected, can be recommended for the study of continental basin sediments.

Název v anglickém jazyce

Beginning of the Miocene Climatic Optimum in Central Europe in sediment archive of the Most Basin, Czech Republic

Popis výsledku anglicky

The Most Basin (Czech Republic) offers an extraordinarily detailed archive of the continental environment in Central Europe (ca. 50 degrees N) in the period around the beginning of the Miocene Climatic Optimum. The sediments were studied by magneto-, chemo-, and cyclostratigraphy. Novel proxies for chemical weathering intensity were derived from K/Al concentration ratios and Mg/Al concentration ratios corrected for autochthonous carbonate content using an isometric log-ratio methodology and robust regression (RR). The correction confirmed that the association of chemical weathering maxima (lows in K/Al or Mg/Al) with eccentricity, obliquity, or precession maxima were affected by sediment grain size to only a minor degree. The orbital control allowed for the refinement of a magnetic-polarity-based depth-age model to unprecedented resolution. The timing of the basin development after the peat swamp flooding was confirmed, it started in the C5Dr.2r subchron, intensified in the C5Dn.1n subchron over several tens of kyr, and spread over the entire basin in the early part of C5Dr.1r. The expression of orbital cycles in weathering proxies changed abruptly near 17.07 and 16.90 Ma, in close temporal proximity to two step-like changes in global marine delta O-18 records between 17.2 and 16.9 Ma. The sensitivity of weathering intensity in the Most Basin to orbital forcing decreased coevally with the initial floods of the Columbia River Basalt Group and disruptions of the global delta C-13 record near the C5Dr/C5Dn reversal at around 16.6 Ma. Ratios K/Al and Mg/Al, either raw or carbonate corrected, can be recommended for the study of continental basin sediments.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

10511 - Environmental sciences (social aspects to be 5.7)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

Bulletin of Geosciences

ISSN

1214-1119

e-ISSN

1802-8225

Svazek periodika

96

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

21

Strana od-do

61-81

Kód UT WoS článku

000606671200005

EID výsledku v databázi Scopus

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