Luminescence geochronology for sediments from Lake El’gygytgyn,northeast Siberia,Russia: constraining the timing of paleoenvironmental events for the past 200 ka |
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| Authors: | Steven L Forman James Pierson Jeaneth Gómez Julie Brigham-Grette Norbert R Nowaczyk Martin Melles |
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| Institution: | (1) Department of Earth and Environmental Sciences, University of Illinois, 845 W. Taylor Street, Chicago, Illinois 60607-7059, USA;(2) Department of Geosciences, University of Massachusetts, Morrill Science Center, 611 North Pleasant Street, Amherst, MA 01003-9297, USA;(3) GeoForschungs Zentrum Potsdam, Telegrafenberg Section 3.3, D-14473 Potsdam, Germany;(4) Institute of Geophysics and Geology, University of Leipzig, Leipzig, Germany |
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| Abstract: | This study focused on the luminescence dating of sediments from Lake El’gygytgyn, a meteorite impact crater 100 km north of
the Arctic Circle in northeast Siberia, formed 3.58 Ma ago. The sediment is principally eolian deposited in to a lake with
nearly permanently ice. The fine-grained polymineral and quartz extracts taken from nine distinct levels from the upper 12.3 m
of sediment core PG1351 were dated by infrared stimulated (IRSL) and green stimulated luminescence (GSL) using multiple aliquot
additive dose procedures. The veracity of these ages is evaluated by comparing to an age model for the core derived from magnetic
excursions and from correlation of variations of the magnetic susceptibility record to similar magnitude variations in δ 18O in the Greenland Ice core record. The IRSL ages from the upper 9 m of core correspond well with the independent age control
for the past ca. 200 ka. However, sediments deeper in the core at 12.3 m with an inferred age of ca. 250 ka age yield a saturated
IRSL response and therefore a non-finite OSL age. The youngest sediment dated from 0.70 m depth yielded the IRSL age of ca.
11.5 ka, older than the corresponding age of 9.3–8.8 ka, indicating a discrepancy in dating the youngest sediments in the
upper 1 m of core. This study confirms the utility of IRSL by the multiple aliquot additive dose method to date sediments
<200 ka old from eastern Siberia.
This is the sixth in a series of eleven papers published in this special issue dedicated to initial studies of El’gygytgyn Crater Lake and
its catchment in NE Russia. Julie Brigham-Grette, Martin Melles, Pavel Minyuk were guest editors of this special issue. |
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| Keywords: | Luminescence dating Arctic lake Geochronology Siberia |
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