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Control of sediment supply, palaeoceanography and morphology on late Quaternary sediment dynamics at the Galician continental slope

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Abstract

Controls of sediment dynamics at the Galician continental slope (NW Iberia) during the past 30 ka were reconstructed from three new gravity cores (GeoB11035-1, 130206–1, 13071–1) based on sedimentological (e.g. sortable silt, IRD), micropalaeontological (e.g. coccoliths), geochemical (AMS 14C, XRF) and geophysical (e.g. magnetic susceptibility) diagnostics. The data are consistent with existing regional knowledge that, during marine isotope stages 3–1, variations in detrital input, marine productivity and sea level were the essential drivers of sediment availability on the slope, whereas deep-water current velocities controlled sediment deposition: (1) the period prior to 30 cal ka BP is characterized by minor but systematic variations in various proxies which can be associated with D-O cycles; (2) between 30 and 18 cal ka BP, high detrital input and steady slope-parallel currents led to constant sedimentation; (3) from the LGM until 10 cal ka BP, the shelf-transgressive sea-level rise increased the detrital particle flux; sedimentation was influenced by significantly enhanced deep-water circulation during the Bølling/Allerød, and subsequent slowing during the Younger Dryas; (4) an abrupt and lasting change to hemipelagic sedimentation at ca. 10 cal ka BP was probably due to Holocene warming and decelerated transgression; (5) after 5 cal ka BP, additional input of detrital material to the slope is plausibly linked to the evolution of fine-grained depocentres on the Galician shelf, this being the first report of this close shelf–slope sedimentary linkage off NW Iberia. Furthermore, there is novel evidence of the nowadays strong outer shelf Iberian Poleward Current becoming established at about 15.5 cal ka BP. The data also demonstrate that small-scale morphologic features and local pathways of sediment export from the neighbouring shelf play an important role for sediment distribution on the NW Iberian slope, including a hitherto unknown sediment conduit off the Ría de Arousa. By implication, the impact of local morphology on along- and down-slope sediment dynamics is more complex than commonly considered, and deserves future attention.

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Acknowledgements

This study was funded through the DFG Graduate College “Proxies in Earth History (EUROPROX)” and DFG-Research 642 Center/Cluster of Excellence “The Ocean in the Earth System”, as well as the GRACCIE (Consolider-Ingenio, CDS 2007–00067) and CONTOURIBER (CTM2008-06399-C04-01/MAR) projects. We wish to thank Captain M. Schneider and his crew of R/V Poseidon for the professional but cordial atmosphere during cruises Pos-342 and Pos-366/3. Sebastian Krastel-Gudegast and Marion Castex are thanked for their supporting work. Furthermore, we are grateful to Susana Lebreiro, Calvin Campbell and two anonymous reviewers for their very constructive comments on earlier versions of this manuscript, as well as to the journal editors for helpful feedback.

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  1. MARUM – Center for Marine Environmental Sciences, University of Bremen, P.O. Box 330 440, 28334, Bremen, Germany

    Vera B. Bender & Till J. J. Hanebuth

  2. Departamento de Xeociencias Mariñas e O.T., Facultad de Ciencias do Mar, Universidade de Vigo, 36310, CUVI, Vigo, Spain

    Anxo Mena & Guillermo Francés

  3. Faculty of Geosciences, University of Bremen, P.O. Box 330 440, 28334, Bremen, Germany

    Karl-Heinz Baumann & Tilo von Dobeneck

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  1. Vera B. Bender
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Bender, V.B., Hanebuth, T.J.J., Mena, A. et al. Control of sediment supply, palaeoceanography and morphology on late Quaternary sediment dynamics at the Galician continental slope. Geo-Mar Lett 32, 313–335 (2012). https://doi.org/10.1007/s00367-012-0282-2

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