Crandallite-rich beds of the Libkovice member, most basin, Czech Republic: Climatic extremes or paleogeographic changes at the onset of the Miocene Climatic Optimum?

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388980%3A_____%2F21%3A00547006" target="_blank" >RIV/61388980:_____/21:00547006 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985891:_____/21:00547006 RIV/00025798:_____/21:00000136 RIV/61989592:15310/21:73610496

Výsledek na webu

<a href="http://hdl.handle.net/11104/0323371" target="_blank" >http://hdl.handle.net/11104/0323371</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1344/GeologicaActa2021.19.11" target="_blank" >10.1344/GeologicaActa2021.19.11</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Crandallite-rich beds of the Libkovice member, most basin, Czech Republic: Climatic extremes or paleogeographic changes at the onset of the Miocene Climatic Optimum?

Popis výsledku v původním jazyce

We describe the occurrence and possible origin of rare beds 1–10cm thick and containing 20–70% of crandallite, a Ca-Al phosphate enriched in Sr and Ba, found within otherwise monotonous clay-rich lacustrine sediments of the Most Basin in the Central-European Neogene Ohře Rift system. The beds were formed at ca. 17.31, 17.06, and 16.88Ma, while the entire suite of monotonous clays of the Libkovice Member was deposited between 17.46 and 16.65Ma. Trace-element and organic geochemistry, Ar-Ar geochronology and C-O-Sr isotope systematics are used to infer their source and processes leading to their formation. The most enigmatic aspect of the formation of the crandallite beds is the removal of a huge amount of phosphorus from its biogenic cycle in the lacustrine system, which was otherwise stable for ca. 0.8My. Formation of detritus-poor crandallite beds could result from some exceptional environmental disruptions that hindered transport of fine clastic material to the basin floor. Silicic volcanic activity in the area of the Pannonian Basin could have triggered this disruption. Crandallite could provide evidence of long-lasting droughts and acidification of the exogenic environment, as they are roughly coeval with the onset of the Miocene Climatic Optimum at ca. 17.0Ma.

Název v anglickém jazyce

Crandallite-rich beds of the Libkovice member, most basin, Czech Republic: Climatic extremes or paleogeographic changes at the onset of the Miocene Climatic Optimum?

Popis výsledku anglicky

We describe the occurrence and possible origin of rare beds 1–10cm thick and containing 20–70% of crandallite, a Ca-Al phosphate enriched in Sr and Ba, found within otherwise monotonous clay-rich lacustrine sediments of the Most Basin in the Central-European Neogene Ohře Rift system. The beds were formed at ca. 17.31, 17.06, and 16.88Ma, while the entire suite of monotonous clays of the Libkovice Member was deposited between 17.46 and 16.65Ma. Trace-element and organic geochemistry, Ar-Ar geochronology and C-O-Sr isotope systematics are used to infer their source and processes leading to their formation. The most enigmatic aspect of the formation of the crandallite beds is the removal of a huge amount of phosphorus from its biogenic cycle in the lacustrine system, which was otherwise stable for ca. 0.8My. Formation of detritus-poor crandallite beds could result from some exceptional environmental disruptions that hindered transport of fine clastic material to the basin floor. Silicic volcanic activity in the area of the Pannonian Basin could have triggered this disruption. Crandallite could provide evidence of long-lasting droughts and acidification of the exogenic environment, as they are roughly coeval with the onset of the Miocene Climatic Optimum at ca. 17.0Ma.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10511 - Environmental sciences (social aspects to be 5.7)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

Geologica Acta

ISSN

1695-6133

e-ISSN

1696-5728

Svazek periodika

19

Číslo periodika v rámci svazku

JUL

Stát vydavatele periodika

ES - Španělské království

Počet stran výsledku

29

Strana od-do

11

Kód UT WoS článku

000717139400012

EID výsledku v databázi Scopus

2-s2.0-85116453973