Sedimentary dynamics along carbonate slopes (Bahamas archipelago)

Hydroacoustic and sedimentological data in the Santaren Channel covering both the leeward slope of Great Bahama Bank and the windward slope of Cay Sal Bank allow new insights into carbonate platform slope sedimentation. The data document the interplay between depositional and erosive processes on bo...

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Veröffentlicht in:Sedimentology 2017-04, Vol.64 (3), p.631-657
Hauptverfasser: Wunsch, Marco, Betzler, Christian, Lindhorst, Sebastian, Lüdmann, Thomas, Eberli, Gregor P., Della Porta, Giovanna
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container_end_page 657
container_issue 3
container_start_page 631
container_title Sedimentology
container_volume 64
creator Wunsch, Marco
Betzler, Christian
Lindhorst, Sebastian
Lüdmann, Thomas
Eberli, Gregor P.
Della Porta, Giovanna
description Hydroacoustic and sedimentological data in the Santaren Channel covering both the leeward slope of Great Bahama Bank and the windward slope of Cay Sal Bank allow new insights into carbonate platform slope sedimentation. The data document the interplay between depositional and erosive processes on both slopes through time and provide information on the current regime and its influence on the slope sedimentary processes. This study emphasizes the diversity and complexity of the slope morphology and the sediment distribution of the youngest high‐frequency sequence, which has developed since the last glacial maximum. The processes triggering slope failures and the formation of channels and gullies differ on both slopes. At the leeward slope of the Great Bahama Bank, extensive slope failures occurred primarily during sea‐level lowering following an interglacial. These slope failures created a slope morphology that channelizes the exported platform sediments during the subsequent highstand. At the windward slope of Cay Sal Bank, contour currents and the local tectonic regime are responsible for slope failures. During sea‐level lowstands, downwelling induces turbidity currents. The interaction of turbidity and contour currents leads to the formation of a system of furrows and slope‐parallel sediment ridges. The discovered heterogeneities in slope sedimentation improve the understanding of carbonate slope sedimentation and provide implications for sequence stratigraphic interpretation of carbonate platform slopes.
doi_str_mv 10.1111/sed.12317
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source Wiley Journals
subjects Archipelagoes
Bahamas
carbonate platform
carbonate slopes
contour currents
Gullies
Marine
Morphology
Sea level
Sediment distribution
Sedimentation
Sedimentation & deposition
slope failure
slope morphology
Slopes
Turbidity
Turbidity currents
title Sedimentary dynamics along carbonate slopes (Bahamas archipelago)
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