Details

Title

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

Journal title

Polish Polar Research

Yearbook

2017

Volume

vol. 38

Numer

No 1

Publication authors

Keywords

Antarctica ; CONISS Cluster Analysis ; Dronning Maud Land Proglacial lake ; Holocene ; microtexture ; Quartz grains ; sand percentage

Divisions of PAS

Nauki o Ziemi

Coverage

1-19

Abstract

Eighteen 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. © 2017 Polish Academy of Sciences 2017.

Publisher

Polish Academy of Sciences ; Committee on Polar Research

Date

01.03.2017

Type

Artykuły / Articles

Identifier

ISSN 0138-0338 ; eISSN 2081-8262
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