Late Quaternary climate and environmental reconstruction based on leaf wax analyses in the loess sequence of Möhlin, Switzerland
| Autor: | L. Wüthrich, M. Bliedtner, I. K. Schäfer, J. Zech, F. Shajari, D. Gaar, F. Preusser, G. Salazar, S. Szidat, R. Zech |
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| Jazyk: | German<br />English |
| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Eiszeitalter und Gegenwart, Vol 66, Pp 91-100 (2017) |
| Druh dokumentu: | article |
| ISSN: | 0424-7116 2199-9090 |
| DOI: | 10.5194/egqsj-66-91-2017 |
| Popis: | We present the results of leaf wax analyses (long-chain n-alkanes) from the 6.8 m deep loess sequence of Möhlin, Switzerland, spanning the last ∼ 70 kyr. Leaf waxes are well preserved and occur in sufficient amounts only down to 0.4 m and below 1.8 m depth, so no paleoenvironmental reconstructions can be done for marine isotope stage (MIS) 2. Compound-specific δ2Hwax analyses yielded similar values for late MIS 3 compared to the uppermost samples, indicating that various effects (e.g., more negative values due to lower temperatures, more positive values due to an enriched moisture source) cancel each other out. A pronounced ∼ 30 ‰ shift towards more negative values probably reflects more humid conditions before ∼ 32 ka. Radiocarbon dating of the n-alkanes corroborates the stratigraphic integrity of leaf waxes and their potential for dating loess–paleosol sequences (LPS) back to ∼ 30 ka. |
| Databáze: | Directory of Open Access Journals |
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