caa a22 4500 463216415 CHVBK 20180405153157.0 cr unu---uuuuu 170326e20071001xx s 000 0 eng 10.1007/s00367-007-0054-6 doi (NATIONALLICENCE)springer-10.1007/s00367-007-0054-6 Depositional conditions and organic matter distribution in the Bornholm Basin, Baltic Sea [Elektronische Daten] [P. Christoffersen, C. Christiansen, J. Jensen, T. Leipe, S. Hille] Information on grain-size distribution and total organic carbon (TOC) content of surface sediment and cores from the Bornholm Basin, together with dating of cores using the 210Pb method and shallow seismic chirp profiling, has been analysed to elucidate long-term accumulation patterns. The presence of non-depositional areas with lag sediments and low TOC content below the wave base indicates that inflows of dense bottom water originating in the North Sea and associated near-bottom currents have strong influence on the depositional patterns of bulk sediment and organic matter in this deep basin. The general fining in mean grain size towards the northeast corresponds to the direction of inflow currents and prevailing winds. Recent and previously found 210Pb-based mean accumulation rates vary greatly within the basin, between 129 and 1,144g m−2 year−1. The accumulation rate may vary by a factor of three even between stations located only 3-4km apart. Rates recorded close to a seismic profile are consistent with the variation in Holocene sediment thickness. This variation reflects a depositional system controlled by near-bottom inflow currents, consisting of a large-scale channel and a wedge-formed sediment package. The spatial variation in TOC content depends partly on water depth, presumably due to generally poorer degradation in the deepest part of the basin because of less frequent oxygen supply by inflow water. Moreover, there is a tendency of higher TOC contents in the southern part of the basin, which may be due to the input of sediments originating from the Oder River. Compared to values for the central, deep Baltic Sea, TOC contents show lower values of 4-6% and insignificant temporal variations. This may be due to the Bornholm Basin being located much closer to the source of the more oxic inflow water, resulting in more favourable degradation conditions. Springer-Verlag, 2007 Christoffersen P. Department of Geography, University of Copenhagen, Øster Voldgade 10, 1350, Copenhagen, Denmark aut Christiansen C. Department of Geography, University of Copenhagen, Øster Voldgade 10, 1350, Copenhagen, Denmark aut Jensen J. GEUS, Øster Voldgade 10, 1350, Copenhagen, Denmark aut Leipe T. Leibniz Institute for Baltic Sea Research, Warnemünde, Seestrasse 15, 18119, Rostock, Germany aut Hille S. Leibniz Institute for Baltic Sea Research, Warnemünde, Seestrasse 15, 18119, Rostock, Germany aut Geo-Marine Letters Springer-Verlag 27/5(2007-10-01), 325-338 0276-0460 27:5<325 2007 27 367 https://doi.org/10.1007/s00367-007-0054-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00367-007-0054-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Christoffersen P. Department of Geography, University of Copenhagen, Øster Voldgade 10, 1350, Copenhagen, Denmark aut NATIONALLICENCE 700 1- Christiansen C. Department of Geography, University of Copenhagen, Øster Voldgade 10, 1350, Copenhagen, Denmark aut NATIONALLICENCE 700 1- Jensen J. GEUS, Øster Voldgade 10, 1350, Copenhagen, Denmark aut NATIONALLICENCE 700 1- Leipe T. Leibniz Institute for Baltic Sea Research, Warnemünde, Seestrasse 15, 18119, Rostock, Germany aut NATIONALLICENCE 700 1- Hille S. Leibniz Institute for Baltic Sea Research, Warnemünde, Seestrasse 15, 18119, Rostock, Germany aut NATIONALLICENCE 773 0- Geo-Marine Letters Springer-Verlag 27/5(2007-10-01), 325-338 0276-0460 27:5<325 2007 27 367 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer