Modern agglutinated foraminifera from the Hovgård ridge, fram strait, west of Spitsbergen: Evidence for a deep bottom current

Kaminski, M. A., Niessen, F., Bazhenova, E., De La Guardia, L C., Coakley, B., De Vernal, H., Eagles, G., Eisermann, H. , Forwick, M., Gebhardt, C., Geissler, W., Horner, T., Jensen, L., Jin, H., Jokat, W., Kaboth, S., Kimmel, B., Kolling, H., Kopsch, C., Kudriavtseva, A., Matthiessen, J., Nam, S.-I., Petersen, Florian, Prim, A. K., Riefstahl, F., Sauermilch, I., Schreck, M., Spielhagen, Robert, Stein, R., Stolle, C. and Zwick, M. and PS87 Shipboard Geoscience Party (2015) Modern agglutinated foraminifera from the Hovgård ridge, fram strait, west of Spitsbergen: Evidence for a deep bottom current Annales Societatis Geologorum Poloniae, 85 . pp. 309-320.

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Abstract

Deep-water agglutinated foraminifera on the crest of the Hovgârd Ridge, west of Spitsbergen, consist mostly of large tubular astrorhizids. At a boxcore station collected from the crest of Hovgârd Ridge at a water depth of 1169 m, the sediment surface was covered with patches of large (1 mm diameter) tubular forms, belonging mostly to the species Astrorhiza crassatina Brady, with smaller numbers of Saccorhiza, Hyperammina, and Psammosiphonella. Non-tubutar species consisted mainly of opportunistic forms, such as Psammosphaera and Reophax. The presence of large suspension-feeding tubular genera as well as opportunistic forms point to the presence of deep currents at this locality that are strong enough to disturb the benthic fauna. This is confirmed by data obtained from sediment echosounding, which exhibit lateral variation in relative sedimentation rates within the Pleistocene sedimentary drape covering the ridge, indicative of winnowing in a south-easterly direction.

Document Type: Article
Keywords: Deep current; Foraminifera; Fram strait; Hovgârd ridge; PARASOUND; Spitsbergen; Astrorhiza; Astrorhizida; Foraminifera; Hyperammina; Psammosphaera; Reophax; Saccorhiza (foraminifer); RV Polarstern; PS87; ARK XXVIII/4
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
AWI
Kiel University
Refereed: Yes
ISSN: 0208-9068
Expeditions/Models:
Date Deposited: 11 Jun 2015 07:19
Last Modified: 01 Feb 2018 07:08
URI: http://eprints.uni-kiel.de/id/eprint/28977

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