Hydrogeochemistry and chemical weathering in a periglacial environment of Maritime Antarctica

Lopes, Daví do Vale; Souza, José João Lelis Leal de; Simas, Felipe Nogueira Bello; Oliveira, Fábio Soares de; Schaefer, Carlos Ernesto Gonçalves Reynaud

doi:10.1016/j.catena.2020.104959

Cited by 17 publications

(13 citation statements)

References 38 publications

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“…Phosphorus from seabirds guano influences the terrestrial and freshwater ecosystems of Antarctica (Qin et al 2014). Fresh feces, under the influence of melting and rains, are partly washed back to sea, but leachates of guano interact with the coarse soil matrix, forming a broad zone of phosphatization (Tatur & Myrcha 1984, Lopes et al 2021a) (Figure 7). In Snow Island, the zone of phosphatization has higher concentration of P (37.9 times higher than non-ornithogenic soils on the marine terrace), K (2.2 times higher), and Ca (2.0 times higher) (Table II).…”

Section: Ornithogenic Environment and Impacts Of The Phosphatization ...mentioning

confidence: 99%

“…Guano deposits contain phosphates and oxalic acid, causing phosphatization and/or dissolution of silicates (Haus et al 2016) (Figure 6). A layer of mineralized guano, rich in calcium phosphates, occurs in these areas (Tatur & Myrcha 1989, Lopes et al 2021a). The mean pH for the ornithogenic soils studied in the present work is 5.0, which is lower than the mean pH of the non-ornithogenic soils on the plateau (6.0) (Table II).…”

Section: Ornithogenic Environment and Impacts Of The Phosphatization ...mentioning

confidence: 99%

“…Ornithogenic soils from Maritime Antarctic are different from those of the Continent (Tatur & Myrcha 1984, Souza et al 2014. In wetter climates, the substances leached/washed from the decomposition of guano react with the underlying substrate to form a broad phosphatizaed zone (Tatur & Myrcha 1984, Simas et al 2007, Lopes et al 2021a. The ornithogenic soils of this region are unique in Antarctica and represent important sites where phosphatization is the main soilforming process (Simas et al 2007, Daher et al 2019, Lopes et al 2019.…”

Section: Introductionmentioning

confidence: 99%

“…Recent studies in periglacial environments aimed to understand how chemical weathering processes are associated with ornithogenic areas in Antarctica (Ugolini 1972, Tatur & Myrcha 1984, Tatur et al 1997, Cocks et al 1999, Michel et al 2006, Simas et al 2007, Pereira et al 2013, Schaefer et al 2017, Daher et al 2019, Lopes et al 2021a, Rodrigues et al 2021. The majority of ornithogenic soils studies focus on the influence of penguins (Ugolini 1972, Tatur & Myrcha 1984, Tatur et al 1997, Simas et al 2007, Schaefer et al 2017, wherever little reports evaluated the influence of flying birds on soil genesis (Cocks et al 1999).…”

Section: Introductionmentioning

confidence: 99%

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Soil pockets phosphatization and chemical weathering of sites affected by flying birds of Maritime Antarctica

Lopes

Oliveira

Souza

et al. 2022

An. Acad. Bras. Ciênc.

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The majority of ornithogenic soils studied in Antarctica focus on the infl uence of penguins, wherever little reports evaluated the infl uence of fl ying birds on soil genesis. This study aimed to characterize the morphologic, chemic, physic, mineralogic, and micromorphologic ornithogenic soil pockets infl uenced by fl ying birds in Snow Island, Maritime Antarctica. Fifteen soil pockets were selected, described, sampled and analyzed, these sites constitute the main areas with intense long-term terrestrial biological activity in Snow Island. In order to investigate the impact of phosphatization, we compared the soil pockets with the surrounding soils and soils affected by penguins.Zone of phosphatization have a high concentration of P, K, and Ca. The XRD patterns for the clay fraction of ornithogenic soils show that phosphate minerals are the main crystalline phases (leucophosphite, minyulite, fl uorapatite, and apatite). We show that even under typical periglacial conditions, sites infl uenced by fl ying birds present active chemical weathering processes. The phosphatization release exchangeable bases and accelerate mineralogical and micromorphological transformations in soils. Under the current global warming trend and expected sea-level rise, the ornithogenic environments are susceptible to accelerated erosion rates and a great part of these hotspots may be lost for the open sea.

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Section: Ornithogenic Environment and Impacts Of The Phosphatization ...mentioning

confidence: 99%

Section: Ornithogenic Environment and Impacts Of The Phosphatization ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Soil pockets phosphatization and chemical weathering of sites affected by flying birds of Maritime Antarctica

Lopes

Oliveira

Souza

et al. 2022

An. Acad. Bras. Ciênc.

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“…This development is originated from pyrite oxidation (sulfurization) and potentialized by climatic conditions (higher temperature and moisture). The MA mild, wetter climate favors the abiotic and biotic chemical reactions promoted by the sulfurization, the leaching of bases, and the non-accumulation of salts (Lopes et al 2021). Considering only the parent materials, the James Ross Archipelago probably would have more developed acid sulfate soils due to the pre-weathered sedimentary rocks (Tatur et al 1993).…”

Section: Acid Sulfate Soils In Maritime Antarcticamentioning

confidence: 99%

Acid sulfate soils from Antarctica: genesis and properties along a climatic gradient

Siqueira

Lopes

Souza

et al. 2022

An. Acad. Bras. Ciênc.

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Sulfurization is a pedogenic process that involves pyrite oxidation and strong soil acidifi cation, accounting for the formation of acid sulfate soils. In Antarctica, acid sulfate soils are related to specifi c parent materials, such as sulfi de-bearing andesites in Maritime Antarctica and pyritized sedimentary rocks in James Ross Archipelago. The hypothesis is that the acid sulfate soils of these regions vary according with a climate gradient. The reviewing of current data showed that the acid sulfate soils of warmer and wetter Maritime Antarctica have a greater weathering degree, higher acidity, leaching, phosphorus adsorption capacity, structural development, and well-crystallized iron oxides and kaolinite formation. On the other hand, the sulfurization at the drier region of James Ross Archipelago is counterbalanced by the semiaridity, resulting in lower acidity and higher base contents combined with little morphological and mineralogical evolution besides presence of weatherable minerals in the clay fraction. The sulfurization process interplays with other pedogenic processes, such as the phosphatization in Maritime Antarctica and salinization in James Ross Archipelago. Higher temperatures and soil moisture enhance the pedogenesis, showing that even the Antarctic sulfate soils, which originated from specifi c parent materials, have their development and characteristics controlled by a clear climatic gradient.

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Lithological controls on soil properties, Snow Island, Maritime Antarctica

Lopes,

de Oliveira,

Reis

et al. 2023

Permafrost & Periglacial

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Soil–parent material is a critical controlling factor of soil properties in the Antarctic region due to a limited degree of soil development. However, the degree to which soil–parent material can be considered the major controlling factor in pedogenesis and subsequent soil physical and chemical properties in Antarctica should be better understood to improve soil mapping and interpretations. The present study aims to analyze the soil properties of different lithological groups on the President Head Peninsula on Snow Island, Maritime Antarctica. Thirty soil profiles across the major lithological groupings on Snow Island (beach deposits, andesites, basalts/andesites, conglomerate, sandstones, siltstones, and mudstones) were described, and the morphological, physical, and chemical properties of samples from sampled genetic horizons were characterized. Beach deposits were most clearly differentiated from other lithological groups, whereas most other groups overlapped strongly in observed properties. Whereas some lithological groups (e.g., sedimentary rock groups) were characterized largely by immature soils with little degree of pedogenesis, other sampled soils exhibited more development. The soil–parent material relationships of Snow Island revealed a unique setting of a complex heterogeneous landscape and show that the area has a great pedological complexity induced by phosphatization, melanization, and cryoturbation processes that preclude placing primary importance on parent material and lithology as the major controlling factor in Antarctic soils.

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Hydrogeochemistry and chemical weathering in a periglacial environment of Maritime Antarctica

Cited by 17 publications

References 38 publications

Soil pockets phosphatization and chemical weathering of sites affected by flying birds of Maritime Antarctica

Soil pockets phosphatization and chemical weathering of sites affected by flying birds of Maritime Antarctica

Acid sulfate soils from Antarctica: genesis and properties along a climatic gradient

Lithological controls on soil properties, Snow Island, Maritime Antarctica

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