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| Titel |
Chronology of Lake El'gygytgyn sediments – a combined magnetostratigraphic, palaeoclimatic and orbital tuning study based on multi-parameter analyses |
| VerfasserIn |
N. R. Nowaczyk, E. M. Haltia, D. Ulbricht, V. Wennrich, M. A. Sauerbrey, P. Rosén, H. Vogel, A. Francke, C. Meyer-Jacob, A. A. Andreev, A. V. Lozhkin |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 9, no. 6 ; Nr. 9, no. 6 (2013-11-01), S.2413-2432 |
| Datensatznummer |
250085251
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| Publikation (Nr.) |
 copernicus.org/cp-9-2413-2013.pdf |
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| Zusammenfassung |
| A 318-metre-long sedimentary profile drilled by the International Continental
Scientific Drilling Program (ICDP) at Site 5011-1 in Lake El'gygytgyn,
Far East Russian Arctic, has been analysed for its sedimentologic response
to global climate modes by chronostratigraphic methods. The 12 km wide lake
is sited off-centre in an 18 km large crater that was created by the impact
of a meteorite 3.58 Ma ago. Since then sediments have been continuously
deposited. For establishing their chronology, major reversals of the earth's
magnetic field provided initial tie points for the age model, confirming
that the impact occurred in the earliest geomagnetic Gauss chron. Various
stratigraphic parameters, reflecting redox conditions at the lake floor and
climatic conditions in the catchment were tuned synchronously to Northern
Hemisphere insolation variations and the marine oxygen isotope stack,
respectively. Thus, a robust age model comprising more than 600 tie points
could be defined. It could be shown that deposition of sediments in Lake
El'gygytgyn occurred in concert with global climatic cycles. The upper
~160 m of sediments represent the past 3.3 Ma, equivalent to
sedimentation rates of 4 to 5 cm ka−1, whereas the lower 160 m
represent just the first 0.3 Ma after the impact, equivalent to
sedimentation rates in the order of 45 cm ka−1. This study also
provides orbitally tuned ages for a total of 8 tephras deposited in Lake
El'gygytgyn. |
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