Abstract
This work aimed to test the suitability of pyrite (FeS2) as a proxy for reconstructing past marine environmental conditions along the semiarid coast of Brazil. Morphological description combined with physicochemical analyses including Fe partitioning were conducted for soil depth profiles (30 and 60 cm depths) at three sites in two contrasting lagoons of the state of Ceará: a suspected former lagoon that would have been transformed into a freshwater “lake” at a site vegetated by Juncus effusus (site P1), and another lagoon with connection to the sea at sites vegetated by J. effusus (site P2) or Portulaca oleracea (site P3). Soil samples were collected in September 2010. Site P3 had more reducing conditions, reaching Eh values of –132 mV in the surface layer (0–10 cm), whereas minimum values for the P1 and P2 sites were +219 and +85 mV, respectively. Lower pyritic Fe values were found at site P1, with a degree of pyritization (DOP) ranging from 10 to 13%. At sites P2 and P3, DOP ranged from 9 to 67% and from 55 to 72%, respectively. These results are consistent with an interruption of tidal channels by eolian dune migration inducing strong changes in the hydrodynamics and physicochemical characteristics (lower salinity, oxidizing conditions) of these sites, causing the dieback of suspected former mangroves and a succession to freshwater marshes with an intermediate salt marsh stage. Together with other physicochemical signatures, pyrite can evidently serve as a useful proxy in tracking environmental changes in such ecotones, with implications for coastal management.
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Acknowledgements
The authors are grateful for financial support from the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), the São Paulo Research Foundation (FAPESP), the Conselleria de Innovación e Industrial Xunta de Galicia (Spain, PGIDIT08MDS036000PR), and the PROMETEO governmental program (Ecuador). Also acknowledged are constructive assessments by two anonymous reviewers and the journal editors.
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Ferreira, T.O., Nóbrega, G.N., Albuquerque, A.G.B.M. et al. Pyrite as a proxy for the identification of former coastal lagoons in semiarid NE Brazil. Geo-Mar Lett 35, 355–366 (2015). https://doi.org/10.1007/s00367-015-0412-8
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DOI: https://doi.org/10.1007/s00367-015-0412-8