Seismic stratigraphy of the late Quaternary sedimentary infill of Lac d'Armor (Kerguelen archipelago): a record of glacier retreat, sedimentary mass wasting and southern Westerly intensification

Lac d'Armor (49 degrees 27'S, 69 degrees 42'E) is a medium-sized, fiord-type lake located on the 'Grande Terre' island of the Kerguelen archipelago. A dense grid of high-resolution reflection seismic profiles was collected from this lake basin. The seismic stratigraphic faci...

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Bibliographic Details
Published in:Antarctic Science
Main Authors: Heirman, Katrien, De Batist, Marc, Arnaud, Fabien, De Beaulieu, Jacques-Louis
Format: Article in Journal/Newspaper
Language:English
Published: 2012
Subjects:
Earth and Environmental Sciences
glacial sedimentation
lacustrine sedimentation
drift deposit
LAKE
OCEAN
DEGLACIATION
CIRCULATION
EVOLUTION
ISLANDS
HISTORY
MAXIMUM
ORIGIN
CLIMATE VARIABILITY
wind-driven currents
Kerguelen
Lac d'Armor
Antarctic Science
Online Access:https://biblio.ugent.be/publication/3096256
http://hdl.handle.net/1854/LU-3096256
https://doi.org/10.1017/S0954102012000466
https://biblio.ugent.be/publication/3096256/file/3096264
Description
Summary:Lac d'Armor (49 degrees 27'S, 69 degrees 42'E) is a medium-sized, fiord-type lake located on the 'Grande Terre' island of the Kerguelen archipelago. A dense grid of high-resolution reflection seismic profiles was collected from this lake basin. The seismic stratigraphic facies reveal a last deglaciation to Holocene infill comparable to the seismic facies found in other glacigenic lakes all over the world. Remarkable features in the seismic stratigraphy are mounded structures found at the southern edge of both sub-basins. The sediment mounds can be interpreted as sediment drifts created by wind-induced bottom currents. The onset of the build-up of these drifts initiated at some point in the Holocene and indicates a strengthening of the southern Westerlies, which are currently the dominant winds on this island.

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