Pre-alpine mire sediments as a mirror of erosion, soil formation and landscape evolution during the last 45 ka
| Autor: | Jarosław Waroszewski, Małgorzata Malkiewicz, Matthias Achermann, Rolf Krebs, Markus Egli, Hans Jäger, Dennis Dahms, Cezary Kabała, Holger Gärtner |
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| Přispěvatelé: | University of Zurich, Egli, Markus |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
geography
geography.geographical_feature_category Soil evolution 1904 Earth-Surface Processes Geochemistry Sediment Glacier Deposition (geology) law.invention Quaternary 10122 Institute of Geography law Erosion Mire 551: Geologie und Hydrologie Radiocarbon dating Dating 910 Geography & travel Geomorphology Foreland basin Geology Earth-Surface Processes Mire sediments |
| Popis: | Peat and lake sediments as well as a nearby soil catena were sampled to reconstruct the environmental history of a small infilled lake basin (mire) in the central alpine foreland of Switzerland. Soil evolution is best regarded as discontinuous over time and conceptualised by ‘progressive’ or ‘regressive’ process phases. We analysed the surrounding soils and used corresponding pedosignatures in the mire sediments to characterise notable phases of erosion and deposition. We assumed that the mire sediments would reflect these phases, that elemental composition (major and minor compounds) and rare earth elements (REEs) would allow us to differentiate past processes and that progressive and regressive phases of soil development can be discerned. Although radiocarbon ages are equivocal, it appears from pollen analyses that a lake was present here by c. 45 ka BP. After the retreat of the glacier from this area following the LGM, continuous sedimentation occurred until a mire developed during Pleistocene–Holocene transition. This transition period was accompanied by more intense erosion, as characterised by chemical signatures. A stable phase developed between c. 10–5 ka BP giving rise to progressive soil evolution. Between 5 and 4 ka BP, evidence appears for several erosional phases, predominantly detectable at the margin of the mire. These erosion phases, coupled with accumulation in the mire, are even more evident after 4 ka BP and especially after 2.1 ka BP. Based on soil investigations, elemental fluxes are detected along the slopes with distinct accumulations at the footslope. Evidence for anthropogenic influences and subsequent regressive soil formation phases appear in this pre-alpine landscape about 5 ka BP (Neolithic/Early Bronze Age), which appears to intensify after 2.1 ka BP (Roman period to present). Multi-elemental signatures enabled us to identify the important geochemical processes that have occurred here. Together with radiocarbon and pollen analyses, we placed these processes in a logical temporal context. The use of lacustrine (lake or mire) sediments has great potential to decipher and detail the surrounding landscape history and soil evolution of this region of Switzerland. |
| Databáze: | OpenAIRE |
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