International Journal of Earth Sciences

, Volume 96, Issue 1, pp 57–72 | Cite as

Environmental changes and growth history of a cold-water carbonate mound (Propeller Mound, Porcupine Seabight)

  • Andres Rüggeberg
  • Christian Dullo
  • Boris Dorschel
  • Dierk Hebbeln
Original paper

Abstract

On- and off-mound sediment cores from Propeller Mound (Hovland Mound province, Porcupine Seabight) were analysed to understand better the evolution of a carbonate mound. The evaluation of benthic foraminiferal assemblages from the off-mound position helps to determine the changes of the environmental controls on Propeller Mound in glacial and interglacial times. Two different assemblages describe the Holocene and Marine Isotope Stage (MIS) 2 and late MIS 3 (∼31 kyr BP). The different assemblages are related to changes in oceanographic conditions, surface productivity and the waxing and waning of the British Irish Ice Sheet (BIIS) during the last glacial stages. The interglacial assemblage is related to a higher supply of organic material and stronger current intensities in water depth of recent coral growth. During the last glaciation the benthic faunas showed high abundances of cassidulinid species, implying cold bottom waters and a reduced availability of organic matter. High sedimentation rates and the domination of Elphidium excavatum point to shelf erosion related to sea-level lowering (∼50 m) and the progradation of the BIIS onto the shelf. A different assemblage described for the on-mound core is dominated by Discanomalina coronata, Gavelinopsis translucens, Planulina ariminensis, Cibicides lobatulus and to a lower degree by Hyrrokkin sarcophaga. These species are only found or show significantly higher relative abundances in on-mound samples and their maximum contribution in the lower part of the record indicates a higher coral growth density on Propeller Mound in an earlier period. They are less abundant during the Holocene, however. This dataset portrays the boundary conditions of the habitable range for the cold-water coral Lophelia pertusa, which dominates the deep-water reefal ecosystem on the upper flanks of Propeller Mound. The growth of this ecosystem occurs during interglacial and interstadial periods, whereas a retreat of corals is documented in the absence of glacial sediments on-mound. Glacial conditions with cold intermediate waters, a weak current regime and high sedimentation rates provide an unfavourable environmental setting for Lophelia corals to grow. A Late Pleistocene decrease is observed in the mound growth for Propeller Mound, which might face its complete burial in the future, as it already happened to the buried mounds of the Magellan Mound province further north.

Keywords

Carbonate mounds Cold-water corals Mound development Paleo-environment Porcupine Seabight NE Atlantic 

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Andres Rüggeberg
    • 1
  • Christian Dullo
    • 1
  • Boris Dorschel
    • 2
  • Dierk Hebbeln
    • 2
  1. 1.IFM-GEOMARLeibniz-Institute of Marine SciencesKielGermany
  2. 2.Department of GeologyUniversity of BremenBremenGermany

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