The sediment properties of glacial diamicts from the Jutulsessen area of Gjelsvikfjella, East Antarctica: A reflection of source materials and regional climate

Shrivastava, Prakash K.; Dharwadkar, Amit; Asthana, Rajesh; Roy, Sandip Kumar; Swain, Ashit K.; Beg, M. Javed

doi:10.1016/j.polar.2014.03.001

Cited by 7 publications

(4 citation statements)

References 29 publications

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“…Chemical weathering is slower at higher altitude, because weathering is less intense for the same rate of sediment supply (Riebe et al, 2004). These CIA values are in agreement with other Himalayan glaciated basins, such as the Pindar basin (56.5) and other part of the world with granite and granodiorite lithologies, including the Alps (49-53; Eynatten et al, 2012), Southwest Iceland (45-56; Thorpe et al, 2019);and East Antarctica (57-60;Srivastava et al, 2014). By comparison, the CIA values of lake sediments show the highest value for the clay component (55-65), while coarse sand exhibits slightly lower values (51-61), indicating less alteration of rocks during deposition (Shukla et al, in review).…”

Section: Geochemical Proxy Responsesupporting

confidence: 84%

Misinterpreting proxy data for paleoclimate signals: A reply to Srivastava and Jovane, 2020

et al. 2020

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Srivastava and Jovane (2020) have made several comments on our assessment of proxy data and challenged the outcome of Shukla et al. (2020) based mainly on interpretation of environmental magnetic parameters. We respond to their criticisms and re-evaluate our paper, remove ambiguities and validate our conclusions through additional proxies (grain-size and geochemistry). We welcome their comments and do not entirely rule out their interpretation for magnetic mineralogy. We highlight the importance of proxy validation for high-energy environments like Chorabari lake. However, single proxy data correlation is likely to produce biased results with no relevant meaning. The objective of our study was to understand complexities in the glacial-climate system by reconstructing late-Holocene climate variations using the glacial lake sediment records from the Mandakini River Basin, Central Himalaya, India. We presented the complexities in Shukla et al. (2020), and this was also highlighted by Srivastava and Jovane (2020). In response, we provide additional justification of proxy response and substantiate our results with present-day estimates from the Chorabari glacier valley. We disagree with the thesis put forward by Srivastava and Jovane (2020) in their conclusion as they overemphasize the interpretation of a single proxy. We maintain that the investigation of present-day glacial settings is an important precursor of paleoclimatic data interpretation and that this supports our conclusions. We will try to incorporate the important suggestions of Srivastava and Jovne (2020) relating to the interpretation of magnetic data in future work.

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Section: Geochemical Proxy Responsesupporting

confidence: 84%

Misinterpreting proxy data for paleoclimate signals: A reply to Srivastava and Jovane, 2020

et al. 2020

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“…The hemipelagic sediments also contain common high‐relief Type E grains with smoothed/abraded fracture surfaces, dish‐shaped depressions, edge rounding and precipitation (Figure 9). These grain types are found in periglacial or high elevation desert environments where perennial lake, river and/or eolian sediment transport processes are impacting otherwise immature quartz grains (Hao et al, 2019; Kalińska‐Nartiša et al, 2017; Li et al, 2020; Mahaney, 2015; Margolis & Krinsley, 1971; Shrivastava et al, 2014; Wellendorf & Krinsley, 1980; Woronko & Hoch, 2011).…”

Section: Results and Interpretationsmentioning

confidence: 99%

Quartz grain microtextures illuminate Pliocene periglacial sand fluxes on the Antarctic continental margin

Passchier

Hansen

Rosenberg

2021

The Depositional Record

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On high‐latitude continental margins sediment is supplied from land to the deep sea through a variety of processes, including iceberg and sea‐ice rafting, and bottom current transport. The accurate reconstruction of sediment fluxes from these sources through time is important in palaeoclimate reconstructions. The goal of this study was to assess a shift in the intensity of glacial processes, iceberg and sea‐ice rafting during the Pliocene through an investigation of coarse sediment deposited at the AND‐2A site in the Ross Sea and at International Ocean Discovery Program Site U1359 on the Antarctic continental rise. Terrigenous particle‐size distributions and suites of quartz grain microtextures in the sand fraction of the deep‐sea sediments were compared to those from Antarctic glaciomarine diamictites as a baseline for proximal glacial sediment in its source area. Using images acquired through Scanning Electron Microscopy, and following a quantitative approach, fewer immature and potentially glacially transported grains were found in Pliocene deep‐sea sand fractions than in ice‐contact sediments. Specifically, in the lower Pliocene interval silt and fine sand percentages are elevated, and microtextures in at least half of the sand fraction are inconsistent with a primary glacial origin. Larger numbers of chemically altered and abraded grains in the deep‐sea sand fraction, along with microtextures that are diagnostic of periglacial environments, suggest a role for eolian sediment transport. These results highlight the anomalous nature of high‐latitude sediment fluxes during prolonged periods of ice retreat. Furthermore, the identification of a significant offshore sediment flux during Antarctic deglaciation has implications for estimated nutrient supply to the Southern Ocean and the potential for high‐latitude climate feedbacks under warmer climate states.

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“…S7E). Associations of microstructures similar to those observed in the glacial Cretaceous grains from Spain, including subparallel fractures, steps, conchoidal fractures, grooves, crushed surfaces, and smoothed surfaces in very angular quartz grains have been observed from (i) glacial diamictites of the Proterozoic of Brazil (Araújo and Nogueira, 2019), (ii) the early Cretaceous of Australia (Alley and Frakes, 2003), (iii) Ordovician subglacial substrates in Gondwana (Le Heron et al, 2020), (iv) glacial deposits associated with Pliocene ice sheets in Canada (Gao et al, 2012); (v) recent proglacial sediments from the Russel Glacier in Greenland (Kalińska-Nartiša et al, 2017); (vi) recent diamicts (Shrivastava et al, 2014) and other glacial sediments (Warrier et al, 2016) in Antarctica; (vii) glacial Quaternary sediments from the southwestern USA (Van Hoesen and Orndorff, 2004); and (viii) recent debris-rich basal ice layers of the NEEM ice core (NW Greenland) (Blard et al, 2023).…”

Section: Fesem Analysis Of Quartz Grainsmentioning

confidence: 99%

Supplemental Material: Ice-rafted dropstones at midlatitudes in the Cretaceous of continental Iberia

Rodríguez-López,

Liesa,

al.

2023

Preprint

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The sediment properties of glacial diamicts from the Jutulsessen area of Gjelsvikfjella, East Antarctica: A reflection of source materials and regional climate

Cited by 7 publications

References 29 publications

Misinterpreting proxy data for paleoclimate signals: A reply to Srivastava and Jovane, 2020

Misinterpreting proxy data for paleoclimate signals: A reply to Srivastava and Jovane, 2020

Quartz grain microtextures illuminate Pliocene periglacial sand fluxes on the Antarctic continental margin

Supplemental Material: Ice-rafted dropstones at midlatitudes in the Cretaceous of continental Iberia

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