Provenance and depositional environment of epi-shelf lake sediment from Schirmacher Oasis, East Antarctica, vis-à-vis scanning electron microscopy of quartz grain, size distribution and chemical parameters

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

doi:10.1016/j.polar.2012.03.006

Cited by 22 publications

(13 citation statements)

References 17 publications

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“…Analysed grains, due to their minor fracturing (see high stress features in Table 2) and medium/low relief (Fig. 5), may record scenarios as proposed by Mahaney and Kalm (1995) and Shrivastava et al (2012). In the first scenario, grains were incorporated to the glacier from non-glacial source; whereas, in the second scenario, grains solely experienced glacial transported over a short distance.…”

Section: Discussionmentioning

confidence: 92%

Quartz grain features in modern glacial and proglacial environments: A microscopic study from the Russell Glacier, southwest Greenland

Kalińska¹,

Lamsters²,

Karušs³

et al. 2017

Polish Polar Research

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This paper provides an overview of the results of research on changes in ground temperature down to 50 cm depth, on the Kaffiøyra Plain, Spitsbergen in the summer seasons. To achieve this, measurement data were analysed from three different ecotopes (CALM Site P2A, P2B and P2C) -a beach, a moraine and tundra -collected during 22 polar expeditions between 1975 and 2014. To ensure comparability, data sets for the common period from 21 July to 31 August (referred to as the "summer season" further in the text) were analysed. The greatest influence on temperature across the inves− tigated ground layers comes from air temperature (correlation coefficients ranging from 0.61 to 0.84). For the purpose of the analysis of the changes in ground temperature in the years 1975-2014, missing data for certain summer seasons were reconstructed on the ba− sis of similar data from a meteorological station at Ny−Ålesund. The ground temperature at the Beach site demonstrated a statistically−significant growing trend: at depths from 1 to 10 cm the temperature increased by 0.27-0.28°C per decade, and from 20 to 50 cm by as much as 0.30°C per decade. On the Kaffiøyra Plain, the North Atlantic Oscillation (NAO) has a greater influence on the ground and air temperature than the Arctic Oscilla− tion (AO).

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Section: Discussionmentioning

confidence: 92%

Quartz grain features in modern glacial and proglacial environments: A microscopic study from the Russell Glacier, southwest Greenland

Kalińska¹,

Lamsters²,

Karušs³

et al. 2017

Polish Polar Research

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“…Removal of matter by wind action and chemical precipitation has also been recorded (Asthana et al, 2009;Shrivastava et al, 2012).…”

Section: Geomorphological Studiesmentioning

confidence: 95%

“…SEM imaging of quartz grains selected at random, reveals a very high degree of mechanical abrasion characterized by features originating from glaciofluvial transport processes (Asthana et al, 2009(Asthana et al, , 2013Shrivastava et al, 2012).…”

Section: Quaternary Geology/paleoclimate Studiesmentioning

confidence: 99%

“…The portion of ice sheet, which floats over the sea, is called ice shelf. The loci of points where Land-IceSea (L-I-S) meet, is called grounding line or hinge line and it has been demarcated for the area close to Schirmacher oasis through GPR profiling (Dharwadkar et al, 2012;Swain and Goswami, 2014). The grounding line is not fixed but keeps shifting in response to changes in environment.…”

Section: Quaternary Geology/paleoclimate Studiesmentioning

confidence: 99%

“…Data generated through these profiles has been used to demarcate the boundaries between land-ice-sea (Dharwadkar et al, 2012). This study has provided significant inputs to the mass balance of Antarctic ice and in estimating the vulnerability of the ice shelf to calving and affecting the land cargo routes between Maitri Station and the docking area of the ship carrying the supplies for Indian and Russian Stations.…”

Section: Quaternary Geology/paleoclimate Studiesmentioning

confidence: 99%

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Recent Contribution to the Antarctic Gelology

Pant¹,

Roy²,

Ravikant³

et al. 2017

Proceedings of the Indian National Science Academy

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Indian geoscientists have been studying Antarctic geology for three and a half decades in Antarctica. The studies were mainly carried out in campaign mode for long but have now assumed greater focus as these have started investigating scientific questions of global interests. Starting from early report of anorogenic magmatism in the central Dronning Maud Land (cDML), identification and description of magmatic charnockites representing a chemically distinct magma to characterizing and confirming the continuation of East African Orogen in Antarctica. These studies represent some of the key contributions besides providing the baseline geological maps of the cDML area. The establishment of permanent station at the Larsemann Hills has allowed wider India-Antarctica geological correlation.The land-sea-ice interface in the cDML and use of marine sediments as archives of ice-sheet fluctuations as well as providing clues to the sub-ice geology is demonstrated from the Wilkes Land sector in east Antarctica. These ice-sheet proximal deposits allow reconstruction of time-constrained advance and retreat of the east Antarctic ice sheet.The contributions include study of Quaternary deposits, especially the lake deposits which have significant bearing on understanding the ice sheet behavior during late Quaternary. Increasing participation in global scientific programs, multidisciplinary studies and active involvement in Scientific Committee on Antarctic Research (SCAR) specially in geoscience augurs well for future progress of Antarctic geoscience studies in India. IntroductionIndian contribution to the Antarctic Geology has largely been confined to the central Dronning Maud Land (cDML) sector of the east Antarctica for nearly three decades . This was on account of the location of the first two stations, Dakshin Gangotri, located on the ice-shelf and Maitri, the second station on ice free Schirmacher Oasis, from which only limited access was possible. The studies which began as localized geological descriptions have assumed significance lately for two reasons-first recognition of cDML terrain as possible extension of the East African Orogen (EAO) in Antarctica and the significance of sub-ice geology in the context of understanding and predicting East Antarctic Ice Sheet (EAIS) behaviour, the largest single mass of fresh frozen water on planet earth. The studies were extended to the Larsemann Hill sector in eastern Antarctica after 2006,following the identification of site for the Bharati Station in the Grovenes Promontory. Indian contributions to Antarctic geology are described in following description for the three domains, namely, the cDML, the Larsemann Hills and the Wilkes Land sector. Central Dronning Maud Land Sector Geological StudiesThe Wohlthat Massif, a rugged mountainous terrain located ~100km south of the Schirmacher Oasis, exposes large magmatic bodies. Indian geologists in pioneering studies recognized largely anorogenic 270Naresh C Pant et al.nature of this magmatism which ranged from ultrabasic to acidic in co...

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Microtextural Inheritance on Quartz Sand Grains from Pleistocene Periglacial Environments of the Mazovian Lowland, Central Poland

Kalińska

Woronko

Ning

2017

Permafrost & Periglacial

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Sand grains from Quaternary glacial, aeolian and fluvial deposits in the Mazovian Lowland, central Poland, were examined to characterize the effects of different Quaternary processes on sand‐grain surfaces that experienced repeated cycles of intense polar‐desert‐like conditions during the Middle and Late Pleistocene. A cold, dry and windy periglacial environment prevailed here at least twice between the Saalian (Marine Isotope Stage (MIS) 6) and Holocene (MIS 1) stages. Because the surface characteristics of quartz sand grains can provide important palaeoenvironmental information, we examined grains extracted from sediment samples in different landforms to determine their surficial features from scanning electron microscope images. The grain surfaces were dominated by microtextures characteristic of aeolian‐induced grain transformation, indicated by a high percentage of well‐rounded, low‐relief‐worn grains with dish‐shaped depressions, bulbous edges and upturned plates. Although remnants of previous sedimentary cycles were occasionally observed, aeolian effects were dominant even in glacial and fluvial settings. Quartz microtextures indicated that none of the examined grains represented their original setting, but rather suggested remobilisation under periglacial conditions. Copyright © 2017 John Wiley & Sons, Ltd.

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Provenance and depositional environment of epi-shelf lake sediment from Schirmacher Oasis, East Antarctica, vis-à-vis scanning electron microscopy of quartz grain, size distribution and chemical parameters

Cited by 22 publications

References 17 publications

Quartz grain features in modern glacial and proglacial environments: A microscopic study from the Russell Glacier, southwest Greenland

Quartz grain features in modern glacial and proglacial environments: A microscopic study from the Russell Glacier, southwest Greenland

Recent Contribution to the Antarctic Gelology

Microtextural Inheritance on Quartz Sand Grains from Pleistocene Periglacial Environments of the Mazovian Lowland, Central Poland

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