Iron biogeochemistry in Holocene palaeo and actual salt marshes in coastal areas of the Pampean Plain, Argentina

Osterrieth, Margarita Luisa; Borrelli, Natalia Lorena; Álvarez, María Fernanda; Nóbrega, Gabriel Nuto; Machado, Wilson; Ferreira, Tiago Osório

doi:10.1007/s12665-016-5506-8

Cited by 7 publications

(9 citation statements)

References 38 publications

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“…33.2d-3, j). These pyrites increased in quantity and morphological variety toward the bottom of the profile, where the anoxic conditions were more resistant (Osterrieth et al 2016).…”

Section: Iron and Calcium Biomineralizationsmentioning

confidence: 98%

“…Degradation processes (sulfurization) were inferred by geochemical and EDXS results, as presence of crystalline iron oxides, lepidocrocite, and ferrihydrite were observed immersed in the matrix of the peds. This sulfurization was related to the complex redox processes of these environments, such as the aeration that is generated in the rhizosphere and also by the intense bioturbation of invertebrates (Osterrieth et al 2016). Once the sequence was exposed to oxic conditions and eroded by storm episodes, the oxidation of sulfides and the intense dissolution and transformation of framboidal pyrite into iron crystalline phases could have been the responsible for the acidic conditions, mainly in the surface horizons (Roychoudhury et al 2003) The association of framboidal pyrites have originated elongated and subspherical poliframboidal pyrites, with sizes of 50-80 μm wide and 190-140 μm length.…”

Section: Iron and Calcium Biomineralizationsmentioning

confidence: 99%

“…These secondary framboidal pyrites were authigenic, generated "in situ" under anoxic conditions (Osterrieth 1992). The framboidal pyrite genesis in these coastal soils of the Pampean Plain was bacterial, through biogeochemical reduction processes that have produced a certain type of microcrystals, very different from those generated by purely chemical action (Osterrieth et al 2016;Wilkin et al 1996).…”

Section: Iron and Calcium Biomineralizationsmentioning

confidence: 99%

“…The low degree of pyritization registered here, which is below the typical values reported for modern estuarine sediments of tropical environments (Wilkin et al 1996), could be explained by the lower proportion of iron obtained here (36-75 μmol Fe/g.) (Osterrieth et al 2016). The sequences of pyrite formation (sulfidation) were observed with diverse morphologies, for example, octahedral-dodecahedral microcrystals and irregular octahedral microcrystals subedrals to anedrals (Fig.…”

Section: Iron and Calcium Biomineralizationsmentioning

confidence: 99%

“…The research of calcium biomineralizations at pedesodimentary sequences associated to bioclastic levels and bioerosion processes is very scarce in Argentina (Osterrieth et al 2000(Osterrieth et al , 2016(Osterrieth et al , 2017.…”

Section: Introductionmentioning

confidence: 99%

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Iron and Calcium Biomineralizations in the Pampean Coastal Plains, Argentina: Their Role in the Environmental Reconstruction of the Holocene

Osterrieth

Frayssinet

2018

Biomineralization

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Biomineralizations are biogenic composites, crystalline or amorphous, produced by the metabolic activity of organisms distributed all over the world. The aim of this work was to evaluate the presence of iron and calcium biomineralizations and their influence in the physicochemical and mineralochemical variations in paleo and actual pedosedimentary sequences of the coastal plains in Mar Chiquita. The complex interaction of calcium with iron biomineralizations, as framboidal and poliframboidal pyrites associated with gypsum, barite, calcite, halite, and iron oxyhydroxides, have demonstrated the active and complex biogeochemistry that occurs in the temperate-wet paleoesturaries and estuaries of the coastal Pampean Plains. Particularly the consequences that different human activities could have, such as the possible acidification processes as result of the iron sulfide oxidation.

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“…33.2d-3, j). These pyrites increased in quantity and morphological variety toward the bottom of the profile, where the anoxic conditions were more resistant (Osterrieth et al 2016).…”

Section: Iron and Calcium Biomineralizationsmentioning

confidence: 98%

Section: Iron and Calcium Biomineralizationsmentioning

confidence: 99%

Section: Iron and Calcium Biomineralizationsmentioning

confidence: 99%

Section: Iron and Calcium Biomineralizationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Iron and Calcium Biomineralizations in the Pampean Coastal Plains, Argentina: Their Role in the Environmental Reconstruction of the Holocene

Osterrieth

Frayssinet

2018

Biomineralization

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Where did the water come from? Wetlands and shallow lakes in semi‐arid dunefields from South America during the Pleistocene–Holocene transition

Tripaldi,

Ozán,

Heider

et al. 2024

J Quaternary Science

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Stabilized and active dunes and sand sheet deposits abound in a small lake‐dotted semi‐arid region of the Western Pampean Dunefield, Argentina. Here, a multi‐scale and multi‐proxy study of three sites, across a hydrologic gradient from lakes to a dryland with groundwater levels at more than 25 m depth, analyzes calcareous and ferruginous rhizoliths, calcareous crusts, hypocoatings, pedogenic carbonate and amorphous Mn‐oxide precipitates within blowout dunes. These palustrine‐related features indicate significantly wetter conditions that allowed the development of shallow lakes and expanding wetlands during the Pleistocene–Holocene transition, limited by associated optically stimulated luminescence ages between ca. 14.7 and 11.6 ka. These wetter conditions, also identified in other nearby proxy records, may be associated with a strengthened South American Monsoon System, potentially during the Younger Dryas Chronozone, though other geological, ecological and climatic forcings cannot be ruled out with available data. Such a scenario lacks a modern analogue, since current hydrologic excess, evidenced in the formation of lakes and new rivers, is not observed in the localities which record paleolakes. This study underlines the variable conditions for pronounced hydrologic excess in semi‐arid eolian environments in western Argentina with complex ecological, anthropogenic and climatic linkages.

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Patagonian salt marsh soils and oxidizable pedogenic pyrite: solid phases controlling aluminum and iron contents in acidic soil solutions

et al. 2018

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Iron biogeochemistry in Holocene palaeo and actual salt marshes in coastal areas of the Pampean Plain, Argentina

Cited by 7 publications

References 38 publications

Iron and Calcium Biomineralizations in the Pampean Coastal Plains, Argentina: Their Role in the Environmental Reconstruction of the Holocene

Iron and Calcium Biomineralizations in the Pampean Coastal Plains, Argentina: Their Role in the Environmental Reconstruction of the Holocene

Where did the water come from? Wetlands and shallow lakes in semi‐arid dunefields from South America during the Pleistocene–Holocene transition

Patagonian salt marsh soils and oxidizable pedogenic pyrite: solid phases controlling aluminum and iron contents in acidic soil solutions

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