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| Titel |
Leaf waxes, compound-specific D/H and 14C analyses in the Loess Paleosol Sequence Möhlin, Switzerland |
| VerfasserIn |
Lorenz Wüthrich, Marcel Bliedtner, Imke Kathrin Schäfer, Jana Zech, Dorian Gaar, Frank Preusser, Roland Zech |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250131511
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| Publikation (Nr.) |
 EGU/EGU2016-11931.pdf |
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| Zusammenfassung |
| Leaf waxes, such as long-chain n-alkanes and n-alkanoic acids, and their D/H isotopic
composition, are increasingly used for paleoenvironmental and –climate reconstructions.
Recent technological innovations now also allow to perform radiocarbon analyses on leaf
waxes. For this study, we analyzed leaf waxes and their δD and 14C composition in the 7 m
Loess Paleosol Sequence Möhlin, Switzerland. The chain length patterns in the upper part of
the profile indicate n-alkane contribution from deciduous trees, while the underlying loess is
dominated by inputs from grasses and herbs. Our δD record does not show depleted, glacial
values compared to the Holocene, as we had expected in analogy to the Greenland ice
core records. Values are most enriched at 1 m depth, i.e. well below the topsoil.
Further research is needed to disentangle source effects and evapotranspirative
enrichment, before the δD record can be interpreted robustly. Our radiocarbon ages for
the leaf waxes are in very good agreement with independent age control based on
luminescence ages, corroborating that massive loess accumulation occurred already at 35
ka. Only the uppermost 3 m were deposited during the last glacial maximum. |
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