Artículo

Mayr, C.; Lücke, A.; Maidana, N.I.; Wille, M.; Haberzettl, T.; Corbella, H.; Ohlendorf, C.; Schäbitz, F.; Fey, M.; Janssen, S.; Zolitschka, B. "Isotopic fingerprints on lacustrine organic matter from Laguna Potrok Aike (southern Patagonia, Argentina) reflect environmental changes during the last 16,000 years" (2009) Journal of Paleolimnology. 42(1):81-102
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Abstract:

A combination of carbon-to-nitrogen ratios (TOC/TN), Rock Eval-analyses, and stable isotope values of bulk nitrogen (δ15N) and organic carbon (δ13Corg) was used to characterize bulk organic matter (OM) of a piston core from the Patagonian maar lake Laguna Potrok Aike (Argentina) for the purpose of palaeoenvironmental reconstruction. Sedimentary data were compared with geochemical signatures of potential OM sources from Laguna Potrok Aike and its catchment area to identify the sources of sedimentary OM. Correlation patterns between isotopic data and TOC/TN ratios allowed differentiation of five distinct phases with different OM composition. Before 8470 calibrated 14C years before present (cal. yrs BP) and after 7400 cal. yrs BP, isotopic and organo-geochemical fingerprints indicate that the sediments of Laguna Potrok Aike consist predominantly of soil and diatom OM with varying admixtures of cyanobacterial and aquatic macrophyte OM. For a short phase of the early Holocene (ca. 8470-7400 cal. yrs BP), however, extremely high input of soil OM is implied by isotopic fingerprints. Previous seismic and geochronological results indicate a severe lake-level drop of 33 m below present-day shortly before 6590 cal. yrs BP. It is suggested that this lake level drop was accompanied by increased erosion of shore banks and channel incision enhancing soil OM deposition in the lake basin. Thus, isotopic data can be linked to hydrological variations at Laguna Potrok Aike and allow a more precise dating of this extremely low lake level. An isotopic mixing model was used including four different sources (soil, cyanobacteria, diatom and aquatic macrophyte OM) to model OM variations and the model results were compared with quantitative microfossil data. © 2008 Springer Science+Business Media B.V.

Registro:

Documento: Artículo
Título:Isotopic fingerprints on lacustrine organic matter from Laguna Potrok Aike (southern Patagonia, Argentina) reflect environmental changes during the last 16,000 years
Autor:Mayr, C.; Lücke, A.; Maidana, N.I.; Wille, M.; Haberzettl, T.; Corbella, H.; Ohlendorf, C.; Schäbitz, F.; Fey, M.; Janssen, S.; Zolitschka, B.
Filiación:GeoBio-Center LMU and Department of Earth and Environmental Sciences, University of Munich, Richard Wagner-Str. 10, 80333 Munich, Germany
Institute of Chemistry and Dynamics of the Geosphere, ICG V: Sedimentary Systems, Research Center Jülich, 52425 Jülich, Germany
Department for Biodiversity and Experimental Biology, University of Buenos Aires-CONICET, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
University of Cologne, Gronewaldstr. 2, 50931 Cologne, Germany
Sedimentology and Environmental Geology, Geoscience Center, University of Göttingen, Goldschmidtstr. 3, 37077 Göttingen, Germany
Argentine Museum of Natural History, Av. Angel Gallardo 470, Buenos Aires, Argentina
Geomorphology and Polar Research (GEOPOLAR), Institute of Geography, University of Bremen, Celsiusstr. FVG-M, 28359 Bremen, Germany
Palabras clave:Isotope mixing model; Lake sediments; Late Quaternary; Organic matter; Rock Eval analyses; Soil erosion; South America; Stable isotopes; carbon isotope; catchment; chemical composition; diatom; environmental change; fossil record; geochronology; Holocene; isotopic analysis; lacustrine deposit; macrophyte; microfossil; organic carbon; paleoenvironment; soil erosion; soil organic matter; stable isotope; Argentina; Laguna Potrok Aike; Santa Cruz [Argentina]; South America; Bacillariophyta; Cyanobacteria
Año:2009
Volumen:42
Número:1
Página de inicio:81
Página de fin:102
DOI: http://dx.doi.org/10.1007/s10933-008-9249-8
Título revista:Journal of Paleolimnology
Título revista abreviado:J. Paleolimnol.
ISSN:09212728
CODEN:JOUPE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09212728_v42_n1_p81_Mayr

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Citas:

---------- APA ----------
Mayr, C., Lücke, A., Maidana, N.I., Wille, M., Haberzettl, T., Corbella, H., Ohlendorf, C.,..., Zolitschka, B. (2009) . Isotopic fingerprints on lacustrine organic matter from Laguna Potrok Aike (southern Patagonia, Argentina) reflect environmental changes during the last 16,000 years. Journal of Paleolimnology, 42(1), 81-102.
http://dx.doi.org/10.1007/s10933-008-9249-8
---------- CHICAGO ----------
Mayr, C., Lücke, A., Maidana, N.I., Wille, M., Haberzettl, T., Corbella, H., et al. "Isotopic fingerprints on lacustrine organic matter from Laguna Potrok Aike (southern Patagonia, Argentina) reflect environmental changes during the last 16,000 years" . Journal of Paleolimnology 42, no. 1 (2009) : 81-102.
http://dx.doi.org/10.1007/s10933-008-9249-8
---------- MLA ----------
Mayr, C., Lücke, A., Maidana, N.I., Wille, M., Haberzettl, T., Corbella, H., et al. "Isotopic fingerprints on lacustrine organic matter from Laguna Potrok Aike (southern Patagonia, Argentina) reflect environmental changes during the last 16,000 years" . Journal of Paleolimnology, vol. 42, no. 1, 2009, pp. 81-102.
http://dx.doi.org/10.1007/s10933-008-9249-8
---------- VANCOUVER ----------
Mayr, C., Lücke, A., Maidana, N.I., Wille, M., Haberzettl, T., Corbella, H., et al. Isotopic fingerprints on lacustrine organic matter from Laguna Potrok Aike (southern Patagonia, Argentina) reflect environmental changes during the last 16,000 years. J. Paleolimnol. 2009;42(1):81-102.
http://dx.doi.org/10.1007/s10933-008-9249-8