Počet záznamů: 1
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
- 1.
SYSNO ASEP 0496960 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název 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 Tvůrce(i) Matys Grygar, Tomáš (UACH-T) RID, SAI, ORCID
Mach, K. (CZ)
Schnabl, Petr (GLU-S) RID, SAI, ORCID
Martinez, M. (FR)
Zeeden, Ch. (FR)Celkový počet autorů 5 Zdroj.dok. Palaeogeography, Palaeoclimatology, Palaeoecology. - : Elsevier - ISSN 0031-0182
Roč. 514, JAN (2019), s. 423-440Poč.str. 18 s. Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova Continental weathering ; Eccentricity ; Geochemistry ; Miocene ; Polarity time scale ; Precession Vědní obor RIV DD - Geochemie Obor OECD Environmental sciences (social aspects to be 5.7) Vědní obor RIV – spolupráce Geologický ústav - Geologie a mineralogie CEP GA16-00800S GA ČR - Grantová agentura ČR Institucionální podpora UACH-T - RVO:61388980 ; GLU-S - RVO:67985831 UT WOS 000456355800032 EID SCOPUS 85056467049 DOI 10.1016/j.palaeo.2018.10.034 Anotace 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. Pracoviště Ústav anorganické chemie Kontakt Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931 Rok sběru 2019
Počet záznamů: 1