Soils of East Antarctic oasis: interplay of organisms and mineral components at microscale

Sedov, Sergey; Zazovskaya, E. P.; Fedorov-Davydov, Dmitriy; Alekseeva, Tatiana

doi:10.18268/bsgm2019v71n1a4

Cited by 12 publications

(7 citation statements)

References 43 publications

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“…We do describe rounded form of some grains, which corresponds well to the data of Meer et al (1993), but the intensity of plasma formation in our section is less expressed. The dominance of quartz and micas is marked by Sedov et al (2019), and we can also confirm these conclusions: Antarctic soil bodies are sedimentary: fluvial (and possibly eolian) deposition of mineral material that occurs simultaneously with the growth of primitive plants (Sedov et al 2019). Thus, the footprint of mineral and granulometric properties of the parent materials are evident in all soils investigated, which is typical not only for Antarctic soils (Sedov et al 2019), but also for Arctic ones (Slagoda et al 2015).…”

Section: Resultssupporting

confidence: 77%

“…The dominance of quartz and micas is marked by Sedov et al (2019), and we can also confirm these conclusions: Antarctic soil bodies are sedimentary: fluvial (and possibly eolian) deposition of mineral material that occurs simultaneously with the growth of primitive plants (Sedov et al 2019). Thus, the footprint of mineral and granulometric properties of the parent materials are evident in all soils investigated, which is typical not only for Antarctic soils (Sedov et al 2019), but also for Arctic ones (Slagoda et al 2015). No intense pedogenic alteration of mineral mass can overlap inherited features of soil forming materials of various origin.…”

Section: Resultssupporting

confidence: 77%

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Micromorphological structure of maritime antarctic cryosols (King-George and Livingston Islands, West Antarctica)

Abakumov¹,

Лупачев²,

Yaneva³

et al. 2022

Czech Polar Rep.

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Cryosols of the Antarctic maritime area are much different from the continental ones. The relatively moderate climate conditions in Maritime Antarctica and a strong interaction between the biotic and abiotic environment are drivers for more intensive soil formation processes than in the continental regions. Soil formation studies from the Maritime Antarctica are, however, rather rare. Therefore, micromorphological investigations on polar soils can contribute to more comprehensive information on soil genesis in Antarctica. In this study, we applied the micromorphological study of thin sections from soil micromonoliths to assess the intensity and trends of the pedogenic processes in selected soils from two adjacent islands of the South-Shetland archipelago: King George Island and Livingston Island. The results obtained show that regional lithology and the origin of the incoming organic matter mainly determine the micromorphological structure of the local soils. Soil matrix micromorphological properties and features (mineralogical content, weathering stage and even partly grain-size distribution) are mainly defined by pyroclastic particles due to recent and ancient volcanic eruptions. The presence of rounded grains and aggregated mineral particles is the evidence of marine origin of the sediments. Ornithogenic soils show the clear evidence of the organic plasma formation and mineral particles aggregation via the zoogenic organic substances provided by penguins which is a unique specifics of the maritime Antarctic soils.

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Section: Resultssupporting

confidence: 77%

Section: Resultssupporting

confidence: 77%

Micromorphological structure of maritime antarctic cryosols (King-George and Livingston Islands, West Antarctica)

Abakumov¹,

Лупачев²,

Yaneva³

et al. 2022

Czech Polar Rep.

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“…Since fire activity is improbable in the study area, the major mechanism behind the distribution of SP grains could be the pedogenic processes related to the chemical weathering of the soils and sediments. The formation of magnetic minerals during the process of pedogenesis have been previously reported from the soils and sediments of Schirmacher Oasis (Sedov et al, 2019; Warrier et al, 2021b, 2021c). The χ fd % values show considerable variations throughout Lake L6 sediment core, suggesting some degree of pedogenesis occurring in the catchment.…”

Section: Resultsmentioning

confidence: 72%

“…Previous studies indicate that the soils of Schirmacher Oasis show chemical alteration of silicate minerals, particularly biotite (Sedov et al, 2019). Weathering processes lead to the formation of fine iron-clay particles, that adhere to the coarse fractions of the primary minerals (Sedov et al, 2019). In the present study, χ fd % also shows a comparable trend to that of CIA during the MHH, indicative of warm and wet conditions favorable for chemical weathering.…”

Section: Resultsmentioning

confidence: 99%

“…In the biplot of ICV versus CIA (Figure 7c), most of the samples from MHH plot near the border region of weak and intense weathering, while in the A-CN-K plot (Figure 7a), the MHH samples can be seen trending toward the illite line, indicating a higher degree of alteration and providing further evidence for the higher intensity of chemical weathering at this interval with the existence of optimal climate conditions. Previous studies indicate that the soils of Schirmacher Oasis show chemical alteration of silicate minerals, particularly biotite (Sedov et al, 2019). Weathering processes lead to the formation of fine iron-clay particles, that adhere to the coarse fractions of the primary minerals (Sedov et al, 2019).…”

Section: Mid-holocene Hypsithermal (Mhh) (~335 To 243 Cal Kyr Bp)mentioning

confidence: 99%

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A high-resolution record of Mid- to Late-Holocene environmental changes from a land-locked lake in Schirmacher Oasis, East Antarctica

Joju,

Warrier,

Mahesh

et al. 2024

The Holocene

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We present a high-resolution record of environmental changes during the Mid-Late Holocene obtained from a lake sediment core covering the past 4.87 cal kyr BP in the Schirmacher Oasis, East Antarctica. The magnetic signal of Lake L6 was found to be primarily controlled by catchment-derived ferrimagnetic minerals. The period between 4.87 and 3.35 cal kyr BP is marked by several episodes of cold and warm conditions. Warm and wet conditions prevailed in the region from 3.35 to 2.43 cal kyr BP. Magnetic susceptibility values remained generally low indicating the pedogenic formation of fine magnetic grains. The high values of the chemical weathering indices reflected the warm and wet conditions conducive to chemical weathering. A transition to cold and dry conditions was observed at around 2.43 cal kyr BP, representing the Neoglacial cooling, with high values of magnetic concentration-dependent parameters. Following the Neoglacial period, a return to warm and wet conditions was observed at 1.63 cal kyr BP, coeval with the Medieval Climate Anomaly. Our record shows a Late-Holocene cooling marked by a sudden increase in magnetic susceptibility values, which could represent the Little Ice Age, followed by a shift to warmer conditions near the core top.

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Climate Change Signatures over Schirmacher Oasis, Antarctica

Dutta

2021

Climate Resilience and Environmental Sustainability Approaches

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Soils of East Antarctic oasis: interplay of organisms and mineral components at microscale

Cited by 12 publications

References 43 publications

Micromorphological structure of maritime antarctic cryosols (King-George and Livingston Islands, West Antarctica)

Micromorphological structure of maritime antarctic cryosols (King-George and Livingston Islands, West Antarctica)

A high-resolution record of Mid- to Late-Holocene environmental changes from a land-locked lake in Schirmacher Oasis, East Antarctica

Climate Change Signatures over Schirmacher Oasis, Antarctica

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