Benthic foraminifera, stable isotope ratios and carbon concentrations of sediment cores from Propeller Mound and Porcupine Srabight, supplement to: 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

DOI

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.

For stable oxygen isotope data see Rueggeberg et al. (2005) datasets: doi:10.1594/PANGAEA.711998 and Dorschel et al. (2005) datasets: doi:10.1594/PANGAEA.711985

Identifier
DOI https://doi.org/10.1594/PANGAEA.711838
Related Identifier https://doi.org/10.1007/s00531-005-0504-1
Related Identifier https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000006917
Related Identifier https://doi.org/10.1007/s00531-005-0493-0
Related Identifier https://doi.org/10.1016/j.epsl.2005.01.035
Related Identifier https://doi.org/10.1007/3-540-27673-4_5
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.711838
Provenance
Creator Rüggeberg, Andres; Dullo, Wolf-Christian; Dorschel, Boris; Hebbeln, Dierk
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2007
Funding Reference Fifth Framework Programme
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Language English
Resource Type Supplementary Collection of Datasets; Collection
Format application/zip
Size 4 datasets
Discipline Earth System Research
Spatial Coverage (-12.771W, 52.148S, -12.767E, 52.159N); Porcupine Seabight
Temporal Coverage Begin 2000-09-24T09:35:00Z
Temporal Coverage End 2000-09-24T17:34:00Z