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| Titel |
Modern sedimentation patterns in Lake El'gygytgyn, NE Russia, derived from surface sediment and inlet streams samples |
| VerfasserIn |
V. Wennrich, A. Francke, A. Dehnert, O. Juschus, T. Leipe, C. Vogt, J. Brigham-Grette, P. S. Minyuk, M. Melles, El'gygytgyn Science Party |
| 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. 1 ; Nr. 9, no. 1 (2013-01-22), S.135-148 |
| Datensatznummer |
250017429
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| Publikation (Nr.) |
 copernicus.org/cp-9-135-2013.pdf |
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| Zusammenfassung |
| Lake El'gygytgyn/NE Russia holds a continuous 3.58 Ma sediment record, which
is regarded as the most long-lasting climate archive of the terrestrial
Arctic. Based on multi-proxy geochemical, mineralogical, and granulometric
analyses of surface sediment, inlet stream and bedrock samples, supplemented
by statistical methods, major processes influencing the modern sedimentation
in the lake were investigated. Grain-size parameters and chemical elements
linked to the input of feldspars from acidic bedrock indicate a wind-induced
two-cell current system as major driver of sediment transport and
accumulation processes in Lake El'gygytgyn. The distribution of mafic rock
related elements in the sediment on the lake floor can be traced back to the
input of weathering products of basaltic rocks in the catchment. Obvious
similarities in the spatial variability of manganese and heavy metals
indicate sorption or co-precipitation of these elements with Fe and Mn
hydroxides and oxides. But the similar distribution of organic matter and
clay contents might also point to a fixation to organic components and clay
minerals. An enrichment of mercury in the inlet streams might be indicative
of neotectonic activity around the lake. The results of this study add to
the fundamental knowledge of the modern lake processes of Lake El'gygytgyn
and its lake-catchment interactions, and thus, yield crucial insights for
the interpretation of paleo-data from this unique archive. |
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