Evidence for a palaeo-subglacial lake on the Antarctic continental shelf.

Abstract:

:Subglacial lakes are widespread beneath the Antarctic Ice Sheet but their control on ice-sheet dynamics and their ability to harbour life remain poorly characterized. Here we present evidence for a palaeo-subglacial lake on the Antarctic continental shelf. A distinct sediment facies recovered from a bedrock basin in Pine Island Bay indicates deposition within a low-energy lake environment. Diffusive-advection modelling demonstrates that low chloride concentrations in the pore water of the corresponding sediments can only be explained by initial deposition of this facies in a freshwater setting. These observations indicate that an active subglacial meltwater network, similar to that observed beneath the extant ice sheet, was also active during the last glacial period. It also provides a new framework for refining the exploration of these unique environments.

journal_name

Nat Commun

journal_title

Nature communications

authors

Kuhn G,Hillenbrand CD,Kasten S,Smith JA,Nitsche FO,Frederichs T,Wiers S,Ehrmann W,Klages JP,Mogollón JM

doi

10.1038/ncomms15591

subject

Has Abstract

pub_date

2017-06-01 00:00:00

pages

15591

issn

2041-1723

pii

ncomms15591

journal_volume

8

pub_type

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