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Holocene stratigraphic evolution of saline lakes in Nhecolândia, southern Pantanal wetlands (Brazil)

Published online by Cambridge University Press:  24 August 2017

Michael M. McGlue ,
Renato Lada Guerreiro ,
Ivan Bergier ,
Aguinaldo Silva ,
Fabiano N. Pupim ,
Victoria Oberc  and
Mario L. Assine
Michael M. McGlue*
Affiliation:
Department of Earth and Environmental Sciences, University of Kentucky, Lexington, Kentucky 40506, USA
Renato Lada Guerreiro
Affiliation:
Instituto Federal do Paraná–Assis Chateaubriand Campus, Assis Chateaubriand, Paraná, CEP 85935-000, Brazil Instituto de Geociências e Ciências Exatas, Universidade Estadual Paulista–Rio Claro, São Paulo, CEP 13506-900, Brazil
Ivan Bergier
Affiliation:
Laboratory of Biomass Conversion, Embrapa Pantanal, Corumbá, Mato Grosso do Sul, CEP 79320-900, Brazil
Aguinaldo Silva
Affiliation:
Departamento de Geografia, Universidade Federal de Mato Grosso do Sul–CPAN, 1270 Avenida Rio Branco, Corumbá, Mato Grosso do Sul, CEP 79304-902, Brazil
Fabiano N. Pupim
Affiliation:
Department of Environmental Sciences, Universidade Federal de São Paulo, Diadema, SP, CEP 09913-030, Brazil
Victoria Oberc
Affiliation:
Department of Earth and Environmental Sciences, University of Kentucky, Lexington, Kentucky 40506, USA
Mario L. Assine
Affiliation:
Instituto de Geociências e Ciências Exatas, Universidade Estadual Paulista–Rio Claro, São Paulo, CEP 13506-900, Brazil
*
* Corresponding author at: Department of Earth and Environmental Sciences, 106 Slone Research Bldg., University of Kentucky, Lexington, Kentucky 40506, USA. E-mail address: [email protected] (M.M. McGlue).
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Abstract

Nhecolândia is a fossil lobe of the Taquari River megafan and a prominent geomorphic subunit of the Pantanal wetlands because of the presence of >10,000 small lakes. We investigated the stratigraphic records of three saline lakes from Nhecolândia to explore their potential as Quaternary hydroclimate archives. Radiocarbon data indicate that accumulation at two lakes was approximately continuous in the late Holocene, and chemostratigraphic variability suggests sensitivity to environmental change with multicentennial resolution. A basal sandy unit and an upper muddy unit comprise the shallow stratigraphy of each lake. A pronounced change in depositional environment from freshwater wetlands to saline lakes at ~3300–3200 cal yr BP best explains the lithofacies transition. Ephemeral freshwater wetlands formed on the abandoned megafan lobe, which was molded by deflation in the arid early Holocene. Wind-scouring of the megafan lobe generated topographically closed depressions with complex marginal sand ridges, which allowed permanent lakes to evolve when rainfall increased in the late Holocene. The lakes became highly saline and alkaline after ~910 cal yr BP, which influences biogeochemistry and aquatic ecology. The results hold implications for understanding the response of the southern Pantanal to climate change, as well as the development of pans in tropical megafan settings.

Keywords

NhecolândiaPantanal wetlandsPaleolimnologySaline lakesStratigraphy
Type
Research Article
Information
Quaternary Research , Volume 88 , Issue 3 , November 2017 , pp. 472 - 490
Copyright
Copyright © University of Washington. Published by Cambridge University Press, 2017 

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