Chronology of Lake El'gygytgyn sediments – a combined magnetostratigraphic, palaeoclimatic and orbital tuning study based on multi-parameter analyses

Nowaczyk, N. R.; Haltia, E. M.; Ulbricht, D.; Wennrich, V.; Sauerbrey, M. A.; Rosén, P.; Vogel, Hendrik; Francke, A.; Meyer-Jacob, C.; Andreev, A. A.; Lozhkin, A. V. (2013). Chronology of Lake El'gygytgyn sediments – a combined magnetostratigraphic, palaeoclimatic and orbital tuning study based on multi-parameter analyses. Climate of the past, 9(6), pp. 2413-2432. Copernicus Publications 10.5194/cp-9-2413-2013

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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 �160m
of sediments represent the past 3.3 Ma, equivalent to sedimentation
rates of 4 to 5 cm ka−1, whereas the lower 160m
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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