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A lacustrine record of the early stage of the Miocene Climatic Optimum in Central Europe from the Most Basin, Ohře (Eger) Graben, Czech Republic

Published online by Cambridge University Press:  16 January 2014

TOMÁŠ MATYS GRYGAR ,
KAREL MACH ,
PETR SCHNABL ,
PETR PRUNER ,
JIŘÍ LAURIN  and
MATHIEU MARTINEZ
TOMÁŠ MATYS GRYGAR*
Affiliation:
Institute of Inorganic Chemistry AS CR, v.v.i., 250 68 Řež, Czech Republic
KAREL MACH
Affiliation:
Severočeské doly, j.s.c., 5. Května 213/4, 418 29 Bílina, Czech Republic
PETR SCHNABL
Affiliation:
Institute of Geology AS CR, v.v.i., Rozvojová 269, 165 00 Prague 6, Czech Republic
PETR PRUNER
Affiliation:
Institute of Geology AS CR, v.v.i., Rozvojová 269, 165 00 Prague 6, Czech Republic
JIŘÍ LAURIN
Affiliation:
Institute of Geophysics AS CR, v.v.i., Boční II/1401, 141 31 Prague 4, Czech Republic
MATHIEU MARTINEZ
Affiliation:
UMR CNRS/uB 6282 Biogéosciences, Université de Bourgogne, 6 boulevard Gabriel, 21000 Dijon, France UMR CNRS/Total/UPPA 5150 Laboratoire des Fluides Complexes et leurs Réservoirs, Université de Pau et des Pays de l'Adour, BP1155, 64013 Pau cedex, France
*
†Author for correspondence: grygar@iic.cas.cz
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Abstract

This study reports on a ~ 150 m thick macrofossil-barren sequence of siliciclastic sediments from a Burdigalian age (Early Miocene) freshwater lake. The lake was located within an incipient rift system of the Most Basin in the Ohře (Eger) Graben, which was part of the European Cenozoic Rift System, and had an original area of ≈ 1000 km2. Sediments from the HK591 core that cover the entire thickness of the lake deposits and some of the adjacent stratigraphic units were analysed by X-ray fluorescence spectroscopy (a proxy for element composition) and magnetic polarity measurement. The element proxies were subjected to frequency analysis, which provided estimated sedimentation rates, and allowed for sediment dating by magnetostratigraphy and orbital tuning of the age model. Based on the resulting age model and the known biostratigraphy, the lake was present between 17.4 and 16.6 Ma, which includes the onset of the Miocene Climatic Optimum in the latest Early Miocene. The identification of orbital forcing (precession, obliquity and short eccentricity cycles) confirms the stability of the sedimentary environment of the perennial lake in an underfilled basin. The dating allowed the sediment record to be interpreted in the context of the current knowledge of the European climate during that period. The stability of the sedimentary environment confirms that precipitation was relatively stable over the period recorded by the sediments.

Keywords

cyclostratigraphylake sedimentsclimate dynamicsMilankovitch cyclesEarly Miocene
Type
Original Articles
Information
Geological Magazine , Volume 151 , Issue 6 , November 2014 , pp. 1013 - 1033
Copyright
Copyright © Cambridge University Press 2014 

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