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. 1.
    SYSNO ASEP0496960
    Druh ASEPJ - Článek v odborném periodiku
    Zařazení RIVJ - Článek v odborném periodiku
    Poddruh JČlánek ve WOS
    NázevOrbital 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 autorů5
    Zdroj.dok.Palaeogeography, Palaeoclimatology, Palaeoecology. - : Elsevier - ISSN 0031-0182
    Roč. 514, JAN (2019), s. 423-440
    Poč.str.18 s.
    Jazyk dok.eng - angličtina
    Země vyd.NL - Nizozemsko
    Klíč. slovaContinental weathering ; Eccentricity ; Geochemistry ; Miocene ; Polarity time scale ; Precession
    Vědní obor RIVDD - Geochemie
    Obor OECDEnvironmental sciences (social aspects to be 5.7)
    Vědní obor RIV – spolupráceGeologický ústav - Geologie a mineralogie
    CEPGA16-00800S GA ČR - Grantová agentura ČR
    Institucionální podporaUACH-T - RVO:61388980 ; GLU-S - RVO:67985831
    UT WOS000456355800032
    EID SCOPUS85056467049
    DOI10.1016/j.palaeo.2018.10.034
    AnotaceWe 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.
    PracovištěÚstav anorganické chemie
    KontaktJana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931
    Rok sběru2019
Počet záznamů: 1  

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