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Open AccessArticle

The Occurrence of Authigenic Clay Minerals in Alkaline-Saline Lakes, Pantanal Wetland (Nhecolândia Region, Brazil)

1
Instituto LAMIR, Universidade Federal do Paraná, Centro Politécnico, Jardim das Américas, Curitiba 81531-980, PR, Brazil
2
Laboratório de Pesquisas Hidrogeológicas, Universidade Federal do Paraná, Centro Politécnico, Jardim das Américas, Curitiba 81531-980, PR, Brazil
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(8), 718; https://doi.org/10.3390/min10080718
Received: 19 May 2020 / Revised: 11 July 2020 / Accepted: 13 July 2020 / Published: 17 August 2020
(This article belongs to the Special Issue From Diagenesis to Low-Grade Metamorphism)
Mg clay minerals are usually associated with carbonates in alkaline-saline environments, precipitated from solution and/or transformation from other minerals. The aim of this research is to identify the mineralogy and geochemistry of clay minerals in different alkaline lakes in the Nhecolândia region, the southernmost region of the Pantanal wetland (Brazil). Sediment samples were analyzed by X-ray diffraction, X-ray fluorescence, scanning electron microscopy and transmission electron microscopy. Water samples were analyzed, determining their main cations and anions, in order to understand their relationship with the clays. The analyses allowed classifying the water bodies as saline, oligosaline and freshwater lakes. The sediments are composed mainly of quartz and a fine-clay fraction, dominated by illite, kaolinite and smectite. The XRD results showed illite and smectite mixed-layered in the saline lakes at Barranco Alto farm, whereas at Nhumirim farm, trioctahedral smectite was only observed in one lake. The smectite minerals were normally identified coupled with calcite at the top of the sequences, associated with exopolymeric substances (EPS) in the lakes, suggesting that these minerals are precipitating due to the physical-chemical and biological conditions of the water bodies. View Full-Text
Keywords: alkaline lakes; clay minerals; EPS; chemical precipitation alkaline lakes; clay minerals; EPS; chemical precipitation
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MDPI and ACS Style

Dias, I.A.; Cury, L.F.; Titon, B.G.; Athayde, G.B.; Fedalto, G.; da Rocha Santos, L.; Soares, A.P.; de Vasconcelos Müller Athayde, C.; Manuela Bahniuk Rumbeslperger, A. The Occurrence of Authigenic Clay Minerals in Alkaline-Saline Lakes, Pantanal Wetland (Nhecolândia Region, Brazil). Minerals 2020, 10, 718. https://doi.org/10.3390/min10080718

AMA Style

Dias IA, Cury LF, Titon BG, Athayde GB, Fedalto G, da Rocha Santos L, Soares AP, de Vasconcelos Müller Athayde C, Manuela Bahniuk Rumbeslperger A. The Occurrence of Authigenic Clay Minerals in Alkaline-Saline Lakes, Pantanal Wetland (Nhecolândia Region, Brazil). Minerals. 2020; 10(8):718. https://doi.org/10.3390/min10080718

Chicago/Turabian Style

Dias, Isis A.; Cury, Leonardo F.; Titon, Bruno G.; Athayde, Gustavo B.; Fedalto, Guilherme; da Rocha Santos, Larissa; Soares, Ana P.; de Vasconcelos Müller Athayde, Camila; Manuela Bahniuk Rumbeslperger, Anelize. 2020. "The Occurrence of Authigenic Clay Minerals in Alkaline-Saline Lakes, Pantanal Wetland (Nhecolândia Region, Brazil)" Minerals 10, no. 8: 718. https://doi.org/10.3390/min10080718

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