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| Titel |
Mass movement deposits in the 3.6 Ma sediment record of Lake El'gygytgyn, Far East Russian Arctic |
| VerfasserIn |
M. A. Sauerbrey, O. Juschus, A. C. Gebhardt, V. Wennrich, N. R. Nowaczyk, M. Melles |
| 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. 4 ; Nr. 9, no. 4 (2013-08-16), S.1949-1967 |
| Datensatznummer |
250085207
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| Publikation (Nr.) |
 copernicus.org/cp-9-1949-2013.pdf |
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| Zusammenfassung |
| This paper focuses on the characterization and genesis of mass movement
deposits (MMDs) in the Quaternary and Pliocene sediments of Lake El'gygytgyn,
Far East Russian Arctic. Three partly overlapping holes were drilled into the 320 m long sediment record at International Continental Scientific Drilling
Program (ICDP) Site 5011-1 in the lake basin, recovering
the Quaternary almost completely, and the Pliocene down to 3.6 Ma with 52%
recovery. Mass movement deposits were investigated in all three cores,
based on macroscopical core descriptions, radiographic images,
high-resolution magnetic susceptibility and gamma-ray density. Five
different types of MMDs were identified: turbidites, grain-flow deposits,
debrites, slumps and slides. These are formed by transitional mass movement
processes, and thus can be co-generic. An initial slope failure is thought
to transform into a debris flow that deforms frontal sediments, partly
disintegrates and dilutes into a turbidity flow. Turbidites are by far the
most frequent MMD type in the lake center. They occur throughout the record
in all pelagic sedimentary facies, but they are thinner in facies formed
during cold climate conditions. All other MMDs, by contrast, incise
exclusively the pelagic facies deposited during warm climates. In the 123 m
thick Quaternary composite sediment record 230 mass movement events are
identified, comprising 33% of the sediment length. Turbidites contribute
93% of the number of Quaternary MMDs, but only 35% of their
thickness. In the Pliocene sediments between 123 and 320 m, 181 additional
mass movement deposits are identified, which constitute ~33% of
the recovered sediments. The mean recurrence interval for MMDs is 11 and
5 ka in the Quaternary and Pliocene, respectively. |
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