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Upper Pleistocene to Holocene peatland evolution in Southern Brazilian highlands as depicted by radar stratigraphy, sedimentology and palynology

Published online by Cambridge University Press:  20 January 2017

Marcelo Accioly Teixeira de Oliveira*
Affiliation:
Departamento de Geociências, Universidade Federal de Santa Catarina (UFSC), Brazil
Jorge Luis Porsani
Affiliation:
Departamento de Geofísica, Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG), Universidade de São Paulo (USP), Brazil
Gisele Leite de Lima
Affiliation:
Universidade Federal da Fronteira Sul (UFFS), Brazil
Vivian Jeske-Pieruschka
Affiliation:
Department of Palynology and Climate Dynamics, Albrecht-von-Haller-Institute for Plant Sciences, Georg-August-University of Göttingen, Germany
Hermann Behling
Affiliation:
Department of Palynology and Climate Dynamics, Albrecht-von-Haller-Institute for Plant Sciences, Georg-August-University of Göttingen, Germany
*
*Corresponding author at: P. O. Box: 5175, Trindade, CEP: 88040–970, Florianópolis, SC, Brazil. E-mail addresses:[email protected] (M.A.T. de Oliveira), [email protected] (J.L. Porsani), [email protected] (G.L. de Lima), [email protected] (V. Jeske-Pieruschka), [email protected] (H. Behling).

Abstract

Paleoenvironmental interpretation of proxy data derived from peatlands is largely based upon an evolutionary model for ombrotrophic bogs, in which peat accumulates in still environments. Reports on proxies obtained from minerotrophic fens, where hydrologic inputs are variable, are less common. In this study, a highland peatland in southern Brazil is presented through ground penetrating radar (GPR) and sedimentological, palynological and geochronologic data. The radar stratigraphic interpretation suggests a relatively complex history of erosion and deposition at the site since the beginning of Marine Isotope Stage 3 (MIS 3) interstadial period. In spite of this, radar stratigraphic and palynologic interpretations converge. Electromagnetic reflections tend to group in clusters that show lateral coherence and correlate with different sediment types, while pollen grains abound and are well preserved. As a result, the study of minerotrophic fens provides a source of proxies, suggesting that ombrotrophic bogs are not the only reliable source of data in wetlands for palynological analysis.

Type
Original Articles
Copyright
University of Washington

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