Chemical weathering in Antarctica: an example of igneous rock particles in Big Lachman Lake sediments, James Ross Island

Vašinka, Martin; Krmíček, Lukáš; Všianský, Dalibor; Hrbáček, Filip; Nývlt, Daniel

doi:10.1007/s12665-020-08926-3

Cited by 7 publications

(3 citation statements)

References 113 publications

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“…Consistent with Vašinka et al (2020), strong consistency exists between the Plagioclase Index of Alteration (PIA) (Fedo et al 1995) and the CIA values of sediments, indicating that plagioclase, in particular the anorthite component, dominated chemical weathering under mostly oxic conditions, as evidenced by a strong positive correlation ( R 2 = 0.93) between the CIA and the Mafic Index of Alteration (MIA) (Babechuk et al 2014) values of the sediments, in particular lake sediments (Table II).…”

Section: Discussionsupporting

confidence: 89%

“…The presence of minor amounts of highly localized clay minerals along with comparable ICV and CIA values of the lake sediments are good indications of the low degree chemical weathering of the bedrocks that feed the watersheds of the lakes. Similarly to our results, Vašinka et al (2020) recently reported the low degree chemical weathering of volcanic rocks, particularly those rich in anorthite, contributing to the Big Lachman Lake sediments.…”

Section: Intensity Of Chemical Weatheringsupporting

confidence: 92%

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Sediment and water geochemistry record of water-rock interactions in King George Island, Antarctic Peninsula

Güneș

Balcı

2022

Antarctic Science

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We used a multidisciplinary approach integrating major, trace and rare earth element geochemistry, mineralogy of rocks and sediments along with the ionic composition of water reservoirs of Admiralty Bay, King George Island, to evaluate the record of water-rock interactions under Maritime Antarctic conditions. Our results showed that the ionic compositions of the streams and meltwaters predominantly reflect the atmospheric inputs, while lake waters have higher Na/Cl, Ca/Mg and HCO3/Cl ratios related to chemical weathering in lake sediments, but this did not allow for distinguishing purely silicate sources. Consistent with the trace and rare earth element data, various alteration indices and Index of Compositional Variability values denote the low degree of chemical weathering in the lake sediments. The records from the previously unexplored Mud Lake and Upper Lake suggest that the lakes of Admiralty Bay are better places to trace the impacts of a succession of environmental changes that have occurred in the watershed, while the stream channel sediments, when accompanied by water chemistry data, may provide a more representative composition of the source rocks than the lake sediments. These findings may help revealing the intensity of contemporary weathering in a colder climate with relatively few mineralogical changes accompanied by a lesser degree of elemental loss.

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Section: Discussionsupporting

confidence: 89%

Section: Intensity Of Chemical Weatheringsupporting

confidence: 92%

Sediment and water geochemistry record of water-rock interactions in King George Island, Antarctic Peninsula

Güneș

Balcı

2022

Antarctic Science

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“…and the Chemical Index of Alteration (CIA). This index is based on the alteration of feldspars, the release of alkali metals, and the accumulation of alumina in the reaction products [37]. The CIA is calculated based on the molar concentration of the oxides, but the CaO content combined with carbonates or phosphates have been excluded.…”

Section: Geochemical Indicesmentioning

confidence: 99%

Risk of Salinization in the Agricultural Soils of Semi-Arid Regions: A Case Study from Moldavian Plain (NE Romania)

et al. 2022

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In the present study, the salinization trends of different soil types from a small hydrographic basin situated in NE Romania (Roșior basin) are investigated. The climatic conditions are favorable for long dry summers and intensive evaporation. The soils are developed on immature evolved clay sediments, as revealed by geochemical analysis. The salinity varies among soil types, attaining maximum values for Solonetz with total dissolved salts (TDS) between 1165.75 to 1881.25 mg/L. The aqueous solutions are represented by natural water and soil solution. The hydrogeochemical facies of the natural waters change from HCO3−—Mg2+ in the upper basin to SO42−—Na+ in the middle or lower basin. The soil solution is moderately or strongly salinized and shows anionic variations from HCO3− to SO42- in the studied profiles, whereas Na+ is always the main cation. The concentrations of Na+ and SO42− evolve simultaneously. Raman spectroscopic exploration of the white efflorescences, which occur on topsoil, reveals the presence of thenardite as the dominant phase. The composition of soil solution results from both the ionic exchange and evaporation processes. The nature of soil solution mineralization and summer temperatures are two main factors that interact and promote the thenardite precipitation. The soil salinization induces negative effects on crop nutrition, impacting further the crop yields. The results of this study can be extrapolated to larger areas formed on Sarmatian sedimentary deposits affected by salinization processes.

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Climate Change Signatures over Schirmacher Oasis, Antarctica

Dutta

2021

Climate Resilience and Environmental Sustainability Approaches

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Chemical weathering in Antarctica: an example of igneous rock particles in Big Lachman Lake sediments, James Ross Island

Cited by 7 publications

References 113 publications

Sediment and water geochemistry record of water-rock interactions in King George Island, Antarctic Peninsula

Sediment and water geochemistry record of water-rock interactions in King George Island, Antarctic Peninsula

Risk of Salinization in the Agricultural Soils of Semi-Arid Regions: A Case Study from Moldavian Plain (NE Romania)

Climate Change Signatures over Schirmacher Oasis, Antarctica

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