Post-Cretaceous–Paleogene slumping in the Subsilesian Unit of the Outer Western Carpathians. Biostratigraphic, sedimentary and magnetic records from the Bystřice section

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F22%3A00566508" target="_blank" >RIV/67985831:_____/22:00566508 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00025798:_____/22:00000222 RIV/00216208:11310/22:10451677

Výsledek na webu

<a href="http://www.geologicacarpathica.com/browse-journal/volumes/73-6/article-1026/" target="_blank" >http://www.geologicacarpathica.com/browse-journal/volumes/73-6/article-1026/</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.31577/GeolCarp.73.6.4" target="_blank" >10.31577/GeolCarp.73.6.4</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Post-Cretaceous–Paleogene slumping in the Subsilesian Unit of the Outer Western Carpathians. Biostratigraphic, sedimentary and magnetic records from the Bystřice section

Popis výsledku v původním jazyce

The Bystřice section, which was previously interpreted as the continuous Cretaceous–Paleogene transition, has been newly studied using biostratigraphy (planktonic foraminifers, calcareous nannofossils), magnetic properties, and geochemistry. Biostratigraphy has confirmed the presence of the upper Maastrichtian (UC20dTP nannozone, Abathomphalus mayaroensis foraminifer zone) and Selandian (NP5–NP7 nannozones, P3b–P4b foraminifer zones). Moreover, the Danian is completely absent. Strong remagnetisation of the rocks did not enable magnetostratigraphy of the section. The magnetic fabric indicates tectonic disturbance of the section. The studied strata consist predominantly of paraconglomerates, which are interpreted as slumps. The slumps contain pebbles and blocks of diverse exotic rocks, intraclasts, and reworked carbonate concretions enclosed within a marly matrix. A few thick paraconglomerate bodies are separated by bedded grey silty marls, sequences of medium-rhythmic sandstone turbidites, and conglomerate. Frequent slump folds indicate synsedimentary deformation. Submarine landslides are manifested by folded and thrusted sandstone beds, breccia of partly-lithified sandstones, and characteristic failure planes. In the lower part of the section, marls and paraconglomerates with Maastrichtian microfossils are interbedded with marls containing Selandian microfossils. It is most likely that the whole of the studied sequence was deposited during the Selandian, and that Maastrichtian marls and paraconglomerates represent submarine mass flows. The deposition took place on the basin slope in the bathyal zone. The geochemical proxy parameters indicate more reducing setting, higher input of terrestrial phytodetrite, as well as higher surface-water temperatures in the Maastrichtian, which is confirmed also by occurrences of low-latitude nannoplankton. The Selandian sediments contain a higher share of aquatic organic matter. The pristane/phytane ratio indicates an oxygenated water column, and carbonate δ13C and δ18O isotopes point to lower surface-water temperatures.

Název v anglickém jazyce

Post-Cretaceous–Paleogene slumping in the Subsilesian Unit of the Outer Western Carpathians. Biostratigraphic, sedimentary and magnetic records from the Bystřice section

Popis výsledku anglicky

The Bystřice section, which was previously interpreted as the continuous Cretaceous–Paleogene transition, has been newly studied using biostratigraphy (planktonic foraminifers, calcareous nannofossils), magnetic properties, and geochemistry. Biostratigraphy has confirmed the presence of the upper Maastrichtian (UC20dTP nannozone, Abathomphalus mayaroensis foraminifer zone) and Selandian (NP5–NP7 nannozones, P3b–P4b foraminifer zones). Moreover, the Danian is completely absent. Strong remagnetisation of the rocks did not enable magnetostratigraphy of the section. The magnetic fabric indicates tectonic disturbance of the section. The studied strata consist predominantly of paraconglomerates, which are interpreted as slumps. The slumps contain pebbles and blocks of diverse exotic rocks, intraclasts, and reworked carbonate concretions enclosed within a marly matrix. A few thick paraconglomerate bodies are separated by bedded grey silty marls, sequences of medium-rhythmic sandstone turbidites, and conglomerate. Frequent slump folds indicate synsedimentary deformation. Submarine landslides are manifested by folded and thrusted sandstone beds, breccia of partly-lithified sandstones, and characteristic failure planes. In the lower part of the section, marls and paraconglomerates with Maastrichtian microfossils are interbedded with marls containing Selandian microfossils. It is most likely that the whole of the studied sequence was deposited during the Selandian, and that Maastrichtian marls and paraconglomerates represent submarine mass flows. The deposition took place on the basin slope in the bathyal zone. The geochemical proxy parameters indicate more reducing setting, higher input of terrestrial phytodetrite, as well as higher surface-water temperatures in the Maastrichtian, which is confirmed also by occurrences of low-latitude nannoplankton. The Selandian sediments contain a higher share of aquatic organic matter. The pristane/phytane ratio indicates an oxygenated water column, and carbonate δ13C and δ18O isotopes point to lower surface-water temperatures.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/GA19-07516S" target="_blank" >GA19-07516S: Hranice křída-paleogén v Karpatech – multidisciplinární výzkum lokálních variací na pozadí globální katastrofické události</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Geologica Carpathica

ISSN

1335-0552

e-ISSN

1336-8052

Svazek periodika

73

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

SK - Slovenská republika

Počet stran výsledku

17

Strana od-do

561-577

Kód UT WoS článku

000904951300004

EID výsledku v databázi Scopus

2-s2.0-85146272282