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Rüggeberg, Andres; Dorschel, Boris; Dullo, Wolf-Christian; Hebbeln, Dierk (2005): Sedimentology and stable oxygen isotope ratios of foraminifera from cores of the Porcupine Seabight, Northeast Atlantic. PANGAEA,, Supplement to: Rüggeberg, A et al. (2005): Sedimentary patterns in the vicinity of a carbonate mound in the Hovland Mound Province, northern Porcupine Seabight. In: Freiwald, A & Roberts, JM (eds.), 2005, Cold-water Corals and Ecosystems, Springer-Verlag, Berlin, Heidelberg, Part I, 87-112,

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Large carbonate mound structures have been discovered in the northern Porcupine Seabight (Northeast Atlantic) at depths between 600 and 1000 m. These mounds are associated with the growth of deep-sea corals Lophelia pertusa and Madrepra oculata. In this study, three sediment cores have been analysed. They are from locations close to Propeller Mound, a 150 m high ridge-like feature covered with a cold-water coral ecosystem at its upper flanks. The investigations are concentrated on grain-size analyses, carbon measurements and on the visual description of the cores and computer tomographic images, to evaluate sediment content and structure.
The cores portray the depositional history of the past ~31 kyr BP, mainly controlled by sea-level fluctuations and the climate regime with the advance and retreat of the Irish Ice Sheet onto the Irish Mainland Shelf. A first advance of glaciers is indicated by a turbiditic release slightly older than 31 kyr BP, coherent with Heinrich event 3 deposition. During Late Marine Isotope Stage 3 (MIS 3) and MIS 2 shelf erosion prevailed with abundant gravity flows and turbidity currents. A change from glaciomarine to hemipelagic contourite sedimentation during the onset of the Holocene indicates the establishment of the strong, present-day hydrodynamic regime at intermediate depths.
The general decrease in accumulation of sediments with decreasing distance towards Propeller Mound suggests that currents (turbidity currents, gravity flows, bottom currents) had a generally stronger impact on the sediment accumulation at the mound base for the past ~31 kyr BP, respectively.
Related to:
Dorschel, Boris (2003): Late Quaternary Development of a deep-water Carbonate Mound in the northeast Atlantic. PhD Thesis, Elektronische Dissertationen an der Staats- und Universitätsbibliothek Bremen, Germany, urn:nbn:de:gbv:46-diss000006917
Dorschel, Boris; Hebbeln, Dierk; Rüggeberg, Andres; Dullo, Wolf-Christian (2007): Carbonate budget of a cold-water coral carbonate mound: Propeller Mound, Porcupine Seabight. International Journal of Earth Sciences, 96(1), 73-83,
Dorschel, Boris; Hebbeln, Dierk; Rüggeberg, Andres; Dullo, Wolf-Christian; Freiwald, André (2005): Growth and Erosion of a Cold-Water Coral Covered Carbonate Mound in the Northeast Atlantic during the Late Pleistocene and Holocene. Earth and Planetary Science Letters, 233(1-2), 33-44,
Rüggeberg, Andres; Dullo, Wolf-Christian; Dorschel, Boris; Hebbeln, Dierk (2007): Environmental changes and growth history of a cold-water carbonate mound (Propeller Mound, Porcupine Seabight). International Journal of Earth Sciences, 96(1), 57-72,
Fifth Framework Programme (FP5), grant/award no. EVK3-CT-1999-00013: Environmental controls on mound formation along the european margin
Median Latitude: 52.155040 * Median Longitude: -12.764793 * South-bound Latitude: 52.150283 * West-bound Longitude: -12.768783 * North-bound Latitude: 52.159617 * East-bound Longitude: -12.749983
Date/Time Start: 2000-09-18T08:34:00 * Date/Time End: 2000-09-24T13:40:00
GeoB6718-1 (POS478-1) * Latitude: 52.159617 * Longitude: -12.749983 * Date/Time: 2000-09-18T08:34:00 * Elevation: -890.0 m * Recovery: 0.27 m * Location: Porcupine Seabight * Campaign: POS265 * Basis: Poseidon * Method/Device: Giant box corer (GKG)
GeoB6719-1 (POS479-1) * Latitude: 52.153883 * Longitude: -12.768783 * Date/Time: 2000-09-18T12:57:00 * Elevation: -758.0 m * Recovery: 4.8 m * Location: Porcupine Seabight * Campaign: POS265 * Basis: Poseidon * Method/Device: Gravity corer (Kiel type) (SL)
GeoB6725-1 (POS485-1) * Latitude: 52.158667 * Longitude: -12.766833 * Date/Time: 2000-09-24T09:35:00 * Elevation: -820.0 m * Recovery: 4.5 m * Location: Porcupine Seabight * Campaign: POS265 * Basis: Poseidon * Method/Device: Gravity corer (Kiel type) (SL)
For carbonate concentrations and further Ca-counts see Dorschel et al. (2007) datasets: doi:10.1594/PANGAEA.712028
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