Seasonal and water-depth variations in sediment luminescence and in sedimentation from sediment trap samples at Gerlache Strait, Antarctic Peninsula

Abstract Sediment trap arrays were deployed in Brialmont Cove and Andvord Bay, eastern Gerlache Strait, from December 2001–March 2003. The recovered sediments (representing instantaneous deposition from the viewpoint of luminescence dating) encompass all the annual and local glaciomarine depositiona...

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Bibliographic Details
Published in:Antarctic Science
Main Authors: Berger, Glenn W., Ante, Sara, Domack, Eugene W.
Format: Article in Journal/Newspaper
Language:English
Published: Cambridge University Press (CUP) 2009
Subjects:
Geology
Ecology, Evolution, Behavior and Systematics
Oceanography
Antarctic
Antarctic Peninsula
Gerlache
Gerlache Strait
Andvord
Andvord Bay
Brialmont
Brialmont Cove
Antarc*
Antarctic Science
Online Access:http://dx.doi.org/10.1017/s0954102009990186
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102009990186
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Summary:Abstract Sediment trap arrays were deployed in Brialmont Cove and Andvord Bay, eastern Gerlache Strait, from December 2001–March 2003. The recovered sediments (representing instantaneous deposition from the viewpoint of luminescence dating) encompass all the annual and local glaciomarine depositional processes. Magnetic susceptibility profiles were used to infer seasonality in the trap cores, and thus to select subsamples for luminescence measurements. Multi-aliquot infrared stimulated luminescence (IRSL) apparent ages were used to assess the effectiveness of ‘clock zeroing’ (by daylight) of light sensitive luminescence within fine silt polymineral samples from each trap depth. IRSL apparent ages for 24 samples indicate that the largest age-depth differences occur with the autumn season samples at both trap sites, suggesting a previously unrecognized and regional (within the Gerlache Strait) change in depositional controls in the autumn compared to other seasons. The apparent ages also indicate some differences between the fjords, and a more complex oceanographic regime at Andvord Bay than at Brialmont Cove. Dry-mass sediment fluxes varied from 0.4 to 0.7 g cm -2 yr -1 , with the largest flux at Brialmont Cove (∼0.7 g cm -2 yr -1 ) occurring in the bottom trap, whereas at Andvord Bay, the largest flux (∼0.6 g cm -2 yr -1 ) occurred in the middle trap (∼45 m above seafloor).

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