Mineralogical implications for the Late Pleistocene glaciation in Amery Oasis, East Antarctica, from a lake sediment core

2008 ◽  
Vol 20 (2) ◽  
pp. 169-172 ◽  
Author(s):  
Nadja Hultzsch ◽  
Bernd Wagner ◽  
Bernhard Diekmann ◽  
Duanne White
Keyword(s):  
Sediment Core ◽  
Surface Sediments ◽  
Mineralogical Composition ◽  
East Antarctica ◽  
Pleistocene Glaciation ◽  
Lower Section ◽  
Rock Outcrops ◽  
Ice Caps ◽  
The Core ◽  
Lake Sediment Core

AbstractThe clay mineralogical composition of a 552 cm long sediment core from Lake Terrasovoje in Amery Oasis, East Antarctica, was analysed and compared with that in surface sediments from other locations in the vicinity. The lower part of the sediment core is formed by sub- and proglacial sediments with a dominance of smectite and illite, and lower amounts of kaolinite and chlorite. The upper part of the core is deposited after 12 500 cal yr bp and mainly composed of illite and kaolinite, with low amounts of smectite and chlorite, such as found in samples from rock outcrops and covering sediments throughout Amery Oasis. The clay composition in the lower section of core Lz1005 suggest that the basin of Lake Terrasovoje was filled by a 150–200 m thickened Nemesis Glacier prior to 12 500 cal yr bp rather than by local ice caps.

scholarly journals PRELIMINARY STUDIES ON SEDIMENT CORE FROM THE TYRO BASIN

2017 ◽  
Vol 50 (1) ◽  
pp. 324
Author(s):  
M. Geraga ◽  
Ch. Anagnostou ◽  
I. Iliopoulos ◽  
M. Kontali
Keyword(s):  
Mediterranean Sea ◽  
Sediment Core ◽  
Eastern Mediterranean ◽  
Planktonic Foraminifera ◽  
Mineralogical Composition ◽  
Eastern Mediterranean Sea ◽  
Sediment Samples ◽  
Preliminary Results ◽  
The Core ◽  
Mineral Constituents

The present paper summarizes the preliminary results of the mineralogical and micropaleontological analysis conducted on sediment samples from core TYR05 retrieved from the anoxic and hypersaline Tyro basin in the eastern Mediterranean Sea. The core comprises a complex lithostratigraphic sequence attributed to the strong geodynamic regime of the area. The planktonic foraminifera associations present fluctuations which coincide with changes in the lithology of the core. The mineralogical composition of the sediments shows influence from the evaporites developed on the bottom of the basin. The mineral constituents in association to the microfauna assemblages suggest that the sediments include sapropelic layers. Further analyses are needed in order to determine safely the sapropelic deposits.

scholarly journals A testimony of detachment of an inland lake from marine influence during the mid-Holocene in the Vestfold Hills region, East Antarctica

2013 ◽  
Vol 13 (4) ◽  
pp. 209-214 ◽  
Author(s):  
Abhijit Mazumder ◽  
Pawan Govil ◽  
Shalini Sharma ◽  
Rasik Ravindra ◽  
Neloy Khare ◽  
...  
Keyword(s):  
Sediment Core ◽  
Environmental Changes ◽  
East Antarctica ◽  
Rare Occurrence ◽  
Salt Crystal ◽  
The Core ◽  
Inland Lake ◽  
Diatom Population ◽  
Marine Influence ◽  
Vestfold Hills

Abstract A 47 cm long sediment core collected from an inland lake of the Vestfold Hills, East Antarctica has been examined to reconstruct the palaeolacustrine environmental changes. The core shows dates at two core intervals of 18-19 cm and 28-29 cm as 5050±98 yrs BP and 5560±96 yrs BP, respectively. The core exhibits a good amount of diatom population throughout the length. Prior to 5560±96 yrs BP, the core shows high abundance of diatom population (>10×107 g-1) along with sufficient salt crystal, which indicates the connection of this lake with the marine environment. From 5560±96 yrs BP to 5050±98 yrs BP the total number diatoms decreased substantially along with the decrease in salt crystal, which indicates the withdrawal of the marine influence from the lake during that period. From 5050±98 yrs BP to Recent, the low number of diatoms and the rare occurrence of salt crystal suggest that the lake remained mostly detached from the sea during the last 5000 yrs.

No significant ice-sheet expansion beyond present ice margins during the past 4500 yr at Rauer Group, East Antarctica

2010 ◽  
Vol 74 (1) ◽  
pp. 23-25 ◽  
Author(s):  
Sonja Berg ◽  
Bernd Wagner ◽  
Duanne A. White ◽  
Martin Melles
Keyword(s):  
Sediment Core ◽  
Radiocarbon Dating ◽  
Ice Sheet ◽  
East Antarctica ◽  
Antarctic Ice Sheet ◽  
The Holocene ◽  
The Core ◽  
The Past ◽  
Field Evidence ◽  
History Of

AbstractThe history of glacial advances and retreats of the East Antarctic ice sheet during the Holocene is not well-known, due to limited field evidence in both the marine and terrestrial realm. A 257-cm-long sediment core was recovered from a marine inlet in the Rauer Group, East Antarctica, 1.8 km in front of the present ice-sheet margin. Radiocarbon dating and lithological characteristics reveal that the core comprises a complete marine record since 4500 yr. A significant ice-sheet expansion beyond present ice margins therefore did not occur during this period.

scholarly journals Paleoenvironments of a proglacial lake in Schirmacher Oasis, East Antarctica: Insights from quartz grain microtextures

2017 ◽  
Vol 38 (1) ◽  
pp. 1-19 ◽  
Author(s):  
Abhijit Mazumder ◽  
Pawan Govil ◽  
Ratan Kar ◽  
Narath Meethal Gayathri ◽  
Keyword(s):  
Cluster Analysis ◽  
Sediment Core ◽  
Grain Morphology ◽  
East Antarctica ◽  
Interglacial Period ◽  
Sediment Samples ◽  
The Core ◽  
Paleoenvironmental Changes ◽  
Schirmacher Oasis ◽  
Proglacial Lake

AbstractEighteen sediment samples from a 36 cm long sediment core retrieved from a proglacial lake (namely P 11) situated in the Schirmacher Oasis, East Antarctica, were analysed for the study of quartz grain morphology and microtexture, along with sand percentage, to reconstruct the paleoenvironmental changes in the lake during the Holocene. The age of the core ranges from 3.3 ka BP to 13.9 ka BP. The quartz grain morphology and microtexture reveal significant evidences of glacial transport along with some eolian and aqueous activities. On the basis of predominance of these signatures and the zonation from CONISS Cluster Analysis on the percentages of characteristic grain morphology and microtextures, the entire core has been subdivided into three major zones. From the paleoenvironmental perspective, it can be concluded that there is an onset of interglacial period at the advent of Holocene (12.3 ka BP), which reigned until 5.3 ka BP and thereafter, again a glacial environment prevailed until 3.3 ka BP with some variations in-between. The results indicate probable alternative colder and less colder phases in the study area, which are also well supported by the respective sand percentages in the sediments.

A 450-year warming and wetting climate in southern Altay inferred from a Yileimu Lake sediment core

2021 ◽  
Author(s):  
Jiawei Fan ◽  
Hanchao Jiang ◽  
Wei Shi ◽  
Qiaoqiao Guo ◽  
Siqi Zhang ◽  
...  
Keyword(s):  
Lake Sediment ◽  
Sediment Core ◽  
Lake Sediment Core

Spatial distribution and source apportionment of PAHs in marine surface sediments of Prydz Bay, East Antarctica

2016 ◽  
Vol 219 ◽  
pp. 528-536 ◽  
Author(s):  
Rui Xue ◽  
Ling Chen ◽  
Zhibo Lu ◽  
Juan Wang ◽  
Haizhen Yang ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Source Apportionment ◽  
Surface Sediments ◽  
East Antarctica ◽  
Prydz Bay ◽  
Marine Surface

Lake Sediment Core Records of Sulphur Accumulation and Sulphur Isotopic Composition in Central Ontario, Canada Lakes

2006 ◽  
Vol 35 (1) ◽  
pp. 99-109 ◽  
Author(s):  
M. Catherine Eimers ◽  
Andrew M. Paterson ◽  
Peter J. Dillon ◽  
Sherry L. Schiff ◽  
Brian F. Cumming ◽  
...  
Keyword(s):  
Isotopic Composition ◽  
Lake Sediment ◽  
Sediment Core ◽  
Lake Sediment Core ◽  
Sulphur Isotopic Composition

scholarly journals Methanesulphonic acid movement in solid ice cores

2004 ◽  
Vol 39 ◽  
pp. 540-544 ◽  
Author(s):  
Barbara T. Smith ◽  
Tas D. Van Ommen ◽  
Mark A. J. Curran
Keyword(s):  
Diffusion Coefficient ◽  
Biological Activity ◽  
Sea Ice ◽  
Diffusion Mechanism ◽  
Ice Core ◽  
Ice Cores ◽  
East Antarctica ◽  
The Core ◽  
Central Value

AbstractMethanesulphonic acid (MSA) is an important trace-ion constituent in ice cores, with connections to biological activity and sea-ice distribution. Post-depositional movement of MSA has been documented in firn, and this study investigates movement in solid ice by measuring variations in MSA distribution across several horizontal sections from an ice core after 14.5 years storage. The core used is from below the bubble close-off depth at Dome Summit South, Law Dome, East Antarctica. MSA concentration was studied at 3 and 0.5 cm resolution across the core widths. Its distribution was uniform through the core centres, but the outer 3 cm showed gradients in concentrations down to less than half of the central value at the core edge. This effect is consistent with diffusion to the surrounding air during its 14.5 year storage. The diffusion coefficient is calculated to be 2 ×10–13 m2 s–1, and the implications for the diffusion mechanism are discussed.

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