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

Dias, I.; Cury, Leonardo Fadel; Titon, Bruno Guimarães; Athayde, Gustavo Barbosa; Fedalto, Guilherme; Santos, Larissa da Rocha; Soares, Ana Paula Alves; Athayde, Camila de Vasconcelos Müller; Rumbeslperger, Anelize Manuela Bahniuk

doi:10.3390/min10080718

Cited by 12 publications

(4 citation statements)

References 43 publications

(119 reference statements)

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“…A small amount of Mg was also removed from exchanges between clay and lake waters (Tipper et al ., 2006). Co‐precipitation of dolomite and Mg‐clay have also been reported with similar dissolved silica levels in Bear Lake in Utah (Dean et al ., 2007; Bright, 2009), Coorong Lakes in Australia (Rosen et al ., 1989), Deep Springs Lake in California (Jones et al ., 1967), Pantanal wetland in Brazil (Dias et al ., 2020), Lake Albert in East Africa (Beuning et al ., 1997), Lake Van in Eastern Anatolia (Reimer et al ., 2009), Amboseli Basin in Kenya and Tanzania (Stoessell & Hay, 1978), coastal sabkha (Bontognali et al ., 2010) and Cretaceous pre‐salt (Tosca & Wright, 2018). These occurrences suggest that dissolved silica catalysing dolomite is a common mechanism in hypersaline lakes and, in turn, provides natural boundary conditions for silica concentration needed for dolomite to nucleate and precipitate (Fig.…”

Section: Discussionmentioning

confidence: 99%

Dissolved silica‐driven dolomite precipitation in the Great Salt Lake, Utah, and its implication for dolomite formation environments

et al. 2023

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Since the discovery of dolomite, numerous attempts have been made to understand its precipitation mechanism at Earth's surface conditions. One such mechanism relies on a relationship with microbial life, where laboratory synthesis experiments have shown that specific organic molecules, such as polysaccharides, exopolymeric substances and hydrogen sulphide can promote dolomite precipitation. Other mechanisms for precipitating dolomite focus on abiotic chemical environments, such as adding dissolved silica, which lower the dehydration energy barrier for the surface Mg2+‐water complex and promote disordered dolomite precipitation. Modern occurrences of dolomite in the Great Salt Lake, Utah, have been studied since the early 20th Century. The distribution of primary dolomite in the Great Salt Lake is spatially heterogeneous, with only the carbonate mud in the South Arm and ridge‐site between desiccation cracks in the North Arm being dominated by dolomite and calcite, while stromatolites in both Arms and ooidal sands in the North Arm are composed entirely of aragonite. It was proposed that dolomite precipitation in the Great Salt Lake was possibly induced by microbial activities such as organic degradation, bacteria sulphate reduction, or other microbial metabolic by‐products. However, these hypotheses could not explain the lack of dolomite in microbial mats, especially in the North Arm, which is constituted by mostly aragonite with no dolomite. Our results suggest that dissolved silica concentration is the primary control for dolomite and Mg‐clay formation in the Great Salt Lake. Even though the North Arm has a much more concentrated Mg and Ca water from lack of freshwater input, dissolved silica levels in the South Arm (>0.5 mm) and the Ridge‐site (ca 0.5 mm) are much higher than in the North Arm (<0.2 mm). Our finding could also provide a new proxy for reconstructing climate changes in the Great Salt Lake area based on dolomite content variation. Phanerozoic dolomite abundance variations may be linked to global CO2 level that facilitates global chemical weathering and dissolved silica input into palaeo‐ocean.

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Section: Discussionmentioning

confidence: 99%

Dissolved silica‐driven dolomite precipitation in the Great Salt Lake, Utah, and its implication for dolomite formation environments

et al. 2023

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“…The mineralogical analyses were conducted at Lamir Institute, Federal University of Paraná, Brazil. X‐ray diffraction of bulk rock and clay fraction were carried out using an Empyrean PANalytical diffractometer, equipped with a Cu anode (Kα1 = 15,406 Å), 40 kV, 40 mA, using a step size of 0.016°2θ, and a count time of 10.16 s per step, following the procedures of Dias et al (2020). The 2θ scanning range was the standard 3.0–70° interval for bulk rock and 3.0–30° for clay mineral fraction.…”

Section: Methodsmentioning

confidence: 99%

The formation and evolution of Al‐rich protoliths in the southern Ribeira belt, Brazil: Insights from remnants of a Precambrian paleoweathering surface

Santos,

Fedalto,

Bahniuk

et al. 2023

Earth Surf Processes Landf

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Bauxitic clays, clayey bauxites and bauxites are residual products formed from the weathering of aluminosilicate‐rich parent rocks under wet and warm conditions. These deposits show a complex interplay between remobilisation of pre‐existing kaolinitic soils and depositional micro‐environments.In the southern Ribeira belt, Brazil, a paleoweathering surface developed on the continental shelf of the Capiru Group passive margin strata and on its basement/source rocks. This weathering cycle gave rise to a paleosol profile on the continental domain and a karstic paleotopography on the emerged carbonate shelf. The surface and karstic nets were later caped and filled with Al‐rich materials, typical of remobilised soils, bauxitic clays, clayey bauxites and pods of karst‐type bauxites.The age of the disconformity is Pre‐Brazilian/Pan‐African, implying a Neoproterozoic age for the weathering surface. In this study, we investigate the relationship among disconformities, paleosols and karst topography to better understand the stratigraphic control, chemical composition and mineralogy of the Al‐rich materials. We interpret this horizon as the remnants of a (meta‐)paleoweathering surface that can serve as a valuable key bed for stratigraphic correlation and paleogeographic reconstructions.We propose that the triggering process for the genesis of the paleosol profiles, bauxitic material and bauxite pods was a coupled mechanism between favourable climate and uplift along the northern margin of the Curitiba–Angola craton, creating a karstic topography that allowed the down‐plain transport of Al‐rich materials. In a later stage, these deposits were metamorphosed, developing a series of Al silicates in unusual paragenesis, typical of Al‐rich protoliths.The presence of these paragenesis, along with the recognition of the disconformity–paleoweathering surface pair, could be a useful tool to understand the paleoenvironmental and paleogeographic evolution of highly deformed terrains.

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“…One of the papers focuses on inclusions remaining from a high P metamorphism in rocks affected by a complex metamorphic history, which includes prograde as well as retrograde processes [59]; another [60], with garnet nucleation and growth, which record the initial steps of dehydration within the subduction zone. Two of them present mineral transformations in the smectite-illite system during diagenesis, either of chemical [61] or burial [28] origins, and a third the incorporation of B, coming from the transformation of organic matter, into the illitic tetrahedral layers [62]. The last one [63] uses the clay transformations and related parameters to establish the pressure/temperature conditions in a key region for the interpretation of the Eurasia-Africa collision in Cenozoic times.…”

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confidence: 99%

“…The work by Armstrong and co-authors presents a study of the clay mineralogy of sediments from several lakes from the Nhecolândia region [61], the southernmost region of the Pantanal Wetland (Brazil). Sediment samples were analyzed by X-ray diffraction and fluorescence as well as scanning and transmission electron microscopy, together with the geochemical characterization of the lake waters, including in situ determination of pH, EC, and TDS.…”

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confidence: 99%

Editorial for Minerals Special Issue “From Diagenesis to Low-Grade metamorphism”

Nieto

Campo

2020

Minerals

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

Cited by 12 publications

References 43 publications

Dissolved silica‐driven dolomite precipitation in the Great Salt Lake, Utah, and its implication for dolomite formation environments

Dissolved silica‐driven dolomite precipitation in the Great Salt Lake, Utah, and its implication for dolomite formation environments

The formation and evolution of Al‐rich protoliths in the southern Ribeira belt, Brazil: Insights from remnants of a Precambrian paleoweathering surface

Editorial for Minerals Special Issue “From Diagenesis to Low-Grade metamorphism”

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