Neoformation of micas in soils surrounding an alkaline-saline lake of Pantanal wetland, Brazil

Furquim, Sheila Aparecida Correia; Barbiéro, Laurent; Graham, Robert C.; Neto, José Pereira de Queiroz; Ferreira, Rosely Pacheco Dias; Furian, Sônia

doi:10.1016/j.geoderma.2010.05.015

Cited by 56 publications

(55 citation statements)

References 45 publications

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“…Unlike the results of Furquim et al (2010a) and Furquim et al (2010b), the diffractograms of the fine clay fraction of the Bt horizons showed a significant presence of kaolinite, evidenced by the reflection of plane 001 (0.71 nm). However, the asymmetry observed after solvation with ethylene glycol (Figure 5) suggests the interstratification of kaolinite-smectite (Moore and Reynolds, 1997), that is, part of the waves are reflected by the corresponding smectite phase.…”

Section: Soil Properties and Pedogenetic Processescontrasting

confidence: 92%

“…Together with accumulation of ions, carbonate precipitation was observed in the P2 and P3 profiles, as well as formation of 2:1 clay minerals (Furquim et al, 2010b), which were present in all the B horizons of the profiles studied. The presence of both smectite and illite are mainly responsible for the strong grade of structures, ranging in size from medium to very large (Table 1), even though in some horizons the clay content does not exceed 350 g kg -1…”

Section: Soil Properties and Pedogenetic Processesmentioning

confidence: 82%

“…In flood plains, the formation of sodic, alkaline, or saline soils is closely related to the process of concentration of river waters and their chemical properties (Furquim et al, 2010a;Furquim et al, 2010b). Rezende Filho et al (2012) analyzed the chemical composition of the main rivers flowing into the Pantanal and observed that the São Lourenço river has alkaline-sodic waters that, when concentrated, favor control of Ca 2+ by formation of carbonates, resulting in pH above 8.0 (Al-Droubi et al, 1980).…”

Section: Introductionmentioning

confidence: 99%

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Genesis and Classification of Sodic Soils in the Northern Pantanal

Oliveira

Chiapini

Nascimento

et al. 2017

Rev. Bras. Ciênc. Solo

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ABSTRACT:The simultaneous occurrence of high levels of exchangeable sodium percentage (ESP) and alkalinity in soils imposes restrictions on plant development and affects physical properties such as porosity, bulk density, permeability, and hydraulic conductivity. Although sodic soils are frequent in the flood plain of the São Lourenço River, northern Pantanal, Brazil, few studies focus on their formation and classification, especially with regard to specific processes and detailed classification into lower categorical levels by the different systems available. The aim of this study was to identify the predominant pedogenetic processes occurring in sodic soils of the flood plain of the São Lourenço River to understand their genesis and assess how taxonomic classification systems contemplate the variations in soil properties. Five profiles were selected in sites with different progressive stages of dissection from erosion (P1, P2, P3, P4, and P5). At each site, a pit was dug for morphological description of the profiles and for collecting samples for chemical, particle size, mineralogical, micromorphological, and chronological analyses. Each profile was classified according to the Soil Taxonomy, World Reference Base (WRB), and Brazilian Soil Classification System (SiBCS/ Sistema Brasileiro de Classificação de Solos). Argilluviation is the predominant process, with a localized and intense ferrolysis action in the E/Bt transition zones in profile P5. Soils showed signs of lithologic discontinuity. This makes it difficult to distinguish how much of the textural gradient is inherited from fluvial sedimentation processes and how much is the result of pedogenetic processes. In the most advanced stage of alteration, P5 had a paler color, thickening of the E horizon, and an abrupt and irregular transition entering the Bt horizon in the form of a "tongue". When passing from the most preserved to the most eroded area, ferrolysis becomes more intense in the E/Bt transition, the electrical conductivity values decrease, and the ESP values increase, suggesting the sodification process. Under Soil Taxonomy criteria, P5 was classified as Natraqualf and the other profiles were classified as Natrudalf; under the WRB, however, all profiles were classified as Solonetz. The SiBCS exhibited variation at the Order level, with P5 classified as Planossolo and the others as Luvissolo. Despite an indication of different processes at the Order level, the SiBCS does not yet contemplate the sodic character in the studied Luvissolos. We propose inclusion of the sodic character at the Great Group level, as has already occurred with other SiBCS classes.

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Section: Soil Properties and Pedogenetic Processescontrasting

confidence: 92%

Section: Soil Properties and Pedogenetic Processesmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

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Genesis and Classification of Sodic Soils in the Northern Pantanal

Oliveira

Chiapini

Nascimento

et al. 2017

Rev. Bras. Ciênc. Solo

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“…3). The last mineral formed is a Fe-illite, which was detected in the fine clay fraction (, 0.2 mm) of horizons with greenish color in the beach around a saline lake (Furquim et al 2010a). Figure 4a shows a control of K + in the most saline waters, suggesting that this element is involved in the formation of the Fe-illite mineral phase.…”

Section: Discussionmentioning

confidence: 97%

Chemical diversity and spatial variability in myriad lakes in Nhecolândia in the Pantanal wetlands of Brazil

Furian

Martins

Parizotto

et al. 2013

Limnology & Oceanography

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Nearly 15,000 shallow, saline or freshwater lakes and ponds coexist in close proximity in the Nhecolâ ndia, a 24,000 km 2 subregion of the Pantanal wetland in Brazil. This study aims to understand the origin of such diversity in surface water, which is a key aspect for the wetland services and biodiversity in the region. Both soil observations and water samples were collected at the regional or local scale and supplemented by previously published data sets. Statistical and geostatistical treatments were carried out and completed by discrete watertable monitoring. The results confirmed the absence of a regional pattern in surface-water salinity, and the independence of electrical conductivity values, even for neighboring lakes. Despite great differences in chemical composition, all surface waters in the region belong to the same chemical family, corresponding to several concentration stages of the Taquari River water that supplies the region. The concentration stage depends on the hydrological functioning of each lake, which is itself controlled by the relative importance of low-permeability soils as a barrier to movement of water into or out of the lakes through the subsurface. In this framework, oligosaline ponds, freshwater lakes, and saline lakes work as recharge, flow-through, and discharge wetlands, respectively. The salinity observed in some lakes results from an ongoing process of accumulation and evaporation under relatively humid climatic conditions and poor drainage.

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“…Algumas evidências discutidas por Furquim et al (2010) sustentam a origem alóctone da caulinita em solos do Pantanal, pois geralmente esses solos são pouco ácidos ou alcalinos, mal-drenados e com saturação por bases alta, condições opostas para a formação desse mineral. A caulinita seria então transportada pelos sistemas fluviais até os solos adjacentes, definindo a origem alóctone da caulinita.…”

Section: Resultados E Discussão Mineralogia Da Fração Argilaunclassified

Geoquímica de solos do pantanal norte, Mato Grosso

Coringa

Couto

Vidal‐Torrado

2014

Rev. Bras. Ciênc. Solo

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Torrado (4) RESUMOA caracterização e análise geoquímica de solos permitem compreender os processos de migração, dispersão e concentração de elementos químicos no perfil, embasando a correlação dos atributos deles com as classes de solos formadas, o que possibilita inferências acerca das gêneses desses solos. Esta pesquisa teve por objetivos caracterizar e interpretar a composição geoquímica total de elementos maiores e menores em classes de solos representativas do Pantanal norte, na sub-região de Barão de Melgaço, Mato Grosso, Brasil. Foram selecionados 20 perfis das principais classes de solos do Pantanal e analisadas amostras dos horizontes A e B (ou C) quanto à concentração de óxidos totais por espectrometria de fluorescência de raios-X, além das caracterizações física, química e mineralógica. Os solos subdividiram-se em dois tipos geoquímicos: um composto por textura arenosa a franco-arenosa com teores relativamente elevados de SiO 2 e predominância de caulinita e quartzo, com menor teor de bases e elementos-traço; e outro composto por textura mais argilosa, geoquimicamente heterogêneos e com teores significativos de minerais 2:1, Al 2 O 3 , óxidos de Fe e Mn, bases e elementos-traço.Termos de indexação: óxidos totais, solos hidromórficos, elementos-traço.

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Neoformation of micas in soils surrounding an alkaline-saline lake of Pantanal wetland, Brazil

Cited by 56 publications

References 45 publications

Genesis and Classification of Sodic Soils in the Northern Pantanal

Genesis and Classification of Sodic Soils in the Northern Pantanal

Chemical diversity and spatial variability in myriad lakes in Nhecolândia in the Pantanal wetlands of Brazil

Geoquímica de solos do pantanal norte, Mato Grosso

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