Orbital forcing and abrupt events in a continental weathering proxy from central Europe (Most Basin, Czech Republic, 17.7–15.9 Ma) recorded beginning of the Miocene Climatic Optimum

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388980%3A_____%2F19%3A00496960" target="_blank" >RIV/61388980:_____/19:00496960 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985831:_____/19:00496960

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.palaeo.2018.10.034" target="_blank" >http://dx.doi.org/10.1016/j.palaeo.2018.10.034</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.palaeo.2018.10.034" target="_blank" >10.1016/j.palaeo.2018.10.034</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Orbital forcing and abrupt events in a continental weathering proxy from central Europe (Most Basin, Czech Republic, 17.7–15.9 Ma) recorded beginning of the Miocene Climatic Optimum

Popis výsledku v původním jazyce

We describe orbital forcing in siliciclastic lacustrine sediments, deposited in central Europe (ca. 50.5°N and 13.5°E, the Most Basin, the Czech Republic) between ~17.7 and ~15.9 Ma, i.e., before the Miocene climatic optimum (MCO) and in its early stage. Chemical element analysis combined with magneto- and cyclostratigraphy produced a consistent stratigraphy for the studied basin fill. The palaeoenvironmental record is mainly based on variations of the chemical weathering intensity in the lake catchment (normalised potassium concentration K/Al or K/Ti). The Most Basin sedimentary profile is specific by relatively high deposition rates (typically 20 cm/kyr, sampling density corresponded to temporal resolution of 1–2 kyr) and sensitivity to a regional continental climate. For age control, we used the ATNTS2012 for younger sediments and an alternative age of the onset of C5Dn chron and the end of C5Dr.1r short chron. In the earliest studied interval, the chemical weathering intensity in the catchment was controlled by precession, while between 17.5 and 17.15 Ma, short eccentricity was mainly driving chemical weathering intensity. After 17.05 Ma, i.e., just before the onset of the MCO, and in the period of persistent high eccentricity between 16.95 and 16.7 Ma, chemical weathering intensity reached its precession-controlled maxima. In the subsequent period of the persistent low eccentricity at 16.65 Ma, the orbital signal nearly vanished in the Most Basin. Abrupt but temporary environmental change occurred in the interval between 16.5 and 16.35 Ma (polarity chron C5Cn.2n), within two cycles of high eccentricity. Its trigger is uncertain but it might have been local or regional. The obtained composite record was compared with marine δ13C and δ18O data, showing certain global control of the Most Basin deposits. The Most Basin record thus shows climatic events of the pre-MCO and early MCO period in terrestrial settings of Central Europe, with changes at 17.05, 16.65, and 16.5 Ma, possibly representing triggers of the MCO.

Název v anglickém jazyce

Orbital forcing and abrupt events in a continental weathering proxy from central Europe (Most Basin, Czech Republic, 17.7–15.9 Ma) recorded beginning of the Miocene Climatic Optimum

Popis výsledku anglicky

We describe orbital forcing in siliciclastic lacustrine sediments, deposited in central Europe (ca. 50.5°N and 13.5°E, the Most Basin, the Czech Republic) between ~17.7 and ~15.9 Ma, i.e., before the Miocene climatic optimum (MCO) and in its early stage. Chemical element analysis combined with magneto- and cyclostratigraphy produced a consistent stratigraphy for the studied basin fill. The palaeoenvironmental record is mainly based on variations of the chemical weathering intensity in the lake catchment (normalised potassium concentration K/Al or K/Ti). The Most Basin sedimentary profile is specific by relatively high deposition rates (typically 20 cm/kyr, sampling density corresponded to temporal resolution of 1–2 kyr) and sensitivity to a regional continental climate. For age control, we used the ATNTS2012 for younger sediments and an alternative age of the onset of C5Dn chron and the end of C5Dr.1r short chron. In the earliest studied interval, the chemical weathering intensity in the catchment was controlled by precession, while between 17.5 and 17.15 Ma, short eccentricity was mainly driving chemical weathering intensity. After 17.05 Ma, i.e., just before the onset of the MCO, and in the period of persistent high eccentricity between 16.95 and 16.7 Ma, chemical weathering intensity reached its precession-controlled maxima. In the subsequent period of the persistent low eccentricity at 16.65 Ma, the orbital signal nearly vanished in the Most Basin. Abrupt but temporary environmental change occurred in the interval between 16.5 and 16.35 Ma (polarity chron C5Cn.2n), within two cycles of high eccentricity. Its trigger is uncertain but it might have been local or regional. The obtained composite record was compared with marine δ13C and δ18O data, showing certain global control of the Most Basin deposits. The Most Basin record thus shows climatic events of the pre-MCO and early MCO period in terrestrial settings of Central Europe, with changes at 17.05, 16.65, and 16.5 Ma, possibly representing triggers of the MCO.

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

<a href="/cs/project/GA16-00800S" target="_blank" >GA16-00800S: Referenční klimatická křivka pro začátek miocenního klimatického optima ve střední Evropě</a><br>

Návaznosti

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

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Palaeogeography, Palaeoclimatology, Palaeoecology

ISSN

0031-0182

e-ISSN

—

Svazek periodika

514

Číslo periodika v rámci svazku

JAN

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

18

Strana od-do

423-440

Kód UT WoS článku

000456355800032

EID výsledku v databázi Scopus

2-s2.0-85056467049