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  • 1
    Electronic Resource
    Electronic Resource
    Uranium at the Cretaceous-Tertiary boundary in Denmark (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Terra nova 2 (1990), S. 0 
    Details
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Uranium is significantly enriched (up to two orders of magnitude) in the Danish Cretaceous-Tertiary boundary beds relative to the underand overlaying sediments. Both the predominant oxic and some anoxic deposits have a high uranium content. To investigate the geochemical behaviour of the element, a series of sections was analysed for uranium by means of the delayed-neutron counting technique.Uranium contents in the carbonate rocks from different parts of the Danish Sub-basin are generally low but show slight regional trends. Experiments that involve cold acid extractions suggest that uranium is associated with the non-carbonate residues.The uranium distribution with depth in the offshore drill core from the Central Graben area (North Sea) suggests that the element is associated with clay in the Danian part.Cretaceous-Tertiary boundary beds from Stevns Klint and other localities in the Danish sub-basin have anomalously high uranium contents compared with the values for chalk. Uranium is not correlated with iron, non-carbonate carbon or aluminium. The highest uranium values within boundary sections are not found in the lower part of the sections as is the case for iridium.The only boundary beds that show typical anoxic depositional affinity have a total uranium accumulation that is one order of magnitude lower than that found in the oxic sections.High amounts of uranium within Cretaceous-Tertiary boundary beds are suggested to be related to diagenetic processes such as compaction and dehydration.Uranium is thought not to cause the extinctions at the Cretaceous-Tertiary boundary because of the relatively low contents found at the actual extinction level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3121.1990.tb00040.x
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Late-Holocene Atlantic bottom-water variability in Igaliku Fjord, South Greenland, reconstructed from foraminiferal faunas (2004)
    SAGE
    In:  The Holocene, 14 (2). pp. 165-171.
    Details
    Publication Date: 2016-05-25
    Description: A high-resolution record of late-Holocene subsurface water-mass characteristics in outer Igaliku Fjord, South Greenland, is presented based on benthic foraminifera faunas from core PO 243–451 collected from a water depth of 304 m. Strati” cation with Atlantic water masses present in the lower part of the water-column is suggested to have prevailed during the last 3200 cal. years, except for a period referred to as the‘Mediaeval Warm Period’ (MWP). During the MWP (c. ad 885–1235) the outer part of Igaliku Fjord experienced enhanced vertical mixing and a high hydrodynamic energy level which we ascribe to increasing wind stress through this period, corresponding to the period of the Norse settlement. The transition from the MWP to the‘Little Ice Age’ (LIA) shows a two-step pattern with a short climatic amelioration around AD 1520 before maximum cooling occurred. The intensified wind stress and the overall environmental change are suggested to have contributed to the loss of the Norse settlement in Greenland. Periods with strong stratification and marked in uence of Atlantic subsurface water masses around 2.6, 1.3 ka BP and during the LIA are correlated to North Atlantic Holocene ice-rafting events reported by Bond et al. (1997).
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1191/0959683604hl699rp
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Temporal and spatial sedimentation rate variabilities in the eastern Gotland Basin, the Baltic Sea (2008)
    Wiley
    In:  Boreas, 31 (1). pp. 65-74.
    Details
    Publication Date: 2016-06-06
    Description: The present study examines sedimentation rates in the eastern Gotland Basin using a variety of methods that reveal considerable heterogeneity in the rates, both spatially and temporally. High-resolution seismic recordings and correlation with long sediment cores indicate increased thickness of strata and higher sedimentation rates (0.75 mm a-1) in the eastern part of the basin than in the western part (0.23 mm a-1) since the Littorina transgression some 8000 14C years BP. This difference is apparently a consequence of a counterclockwis e near-bottom circulation in the basin with periodically high current speeds that cause winnowing on the steep SE slope of the basin and differential settling of sediments in areas of low current speeds. On shorter time scales, recent sediment accumulation rates based on radiometric dating (210Pb) are in general twice as high as those observed 25 years ago using the same method. The higher modern rates, compared to those of the 1970s, may partly be due to increased eutrophication, as more carbon is buried in the sediment, and partly due to increased erosion in shallow water areas. However, strong lateral variations are evident. The average sediment accumulation rates vary between 119 and 340 gm-2 a-1 (corresponding to sedimentation rates of 2.1–2.5 mm a-1) in the deepest part of the basin. Very high rates (6100 g m-2 a-1, corresponding to sedimentation rates of 30 mm a-1) are observed on an intraslope basin site (offshore Latvia) at a water depth of only 70 m. The radiometrically determined sediment accumulation rates are up to three times higher than those estimated from average water column concentrations of suspended matter and from sediment trap flux rates. The discrepancy suggests that sedimentation in the deep basin may have a substantial contribution from near-bottom lateral transport.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1111/j.1502-3885.2002.tb01056.x
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Climate change and the Viking-age fjord environment of the Eastern Settlement, South Greenland (1999)
    Geological Survey of Denmark and Greenland
    In:  Geology of Greenland Survey Bulletin - Review of Greenland Activities, 183 . pp. 61-67.
    Details
    Publication Date: 2019-09-23
    Type: Article , NonPeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - without review
  • 5
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    Geochemistry of sediment core IOW211671-1 (1999)
    PANGAEA
    Details
    Publication Date: 2023-03-07
    Keywords: Arsenic; Arsenic, standard deviation; Baltic Sea System Study; BASYS; Bromine; Bromine, standard deviation; Calcium; Calcium, standard deviation; Chromium; Chromium, standard deviation; Cobalt; Cobalt, standard deviation; Copper; Copper, standard deviation; DEPTH, sediment/rock; Energy dispersive X-ray analysis, EDAX; Gallium; Gallium, standard deviation; Gulf of Riga; IOW211671-1; Iron; Iron, standard deviation; KOT99/97/02.1; Manganese; Manganese, standard deviation; Molybdenum; Molybdenum, standard deviation; NC; Nickel; Nickel, standard deviation; Niemistoe corer; Niobium; Niobium, standard deviation; Northern Cape Basin; Petr Kottsov; Potassium; Potassium, standard deviation; Rubidium; Rubidium, standard deviation; Rubidium/Strontium ratio; Selenium; Strontium; Strontium, standard deviation; Titanium; Titanium, standard deviation; Vanadium; Vanadium, standard deviation; Yttrium; Yttrium, standard deviation; Zinc; Zinc, standard deviation; Zirconium; Zirconium, standard deviation; Zirconium/Niobium ratio; Zirconium/Strontium ratio
    Type: Dataset
    Format: text/tab-separated-values, 1860 data points
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    DATA PANGAEA
  • 6
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    Geochemistry of sediment core ARA-6/98-BBTB (1999)
    PANGAEA
    Details
    Publication Date: 2023-03-07
    Keywords: ARA-6/98; ARA-6/98-BBTB; Aranda (1989); Arsenic; Arsenic, standard deviation; Baltic Sea System Study; BASYS; Bornholm Basin, Baltic Sea; Bromine; Bromine, standard deviation; Calcium; Calcium, standard deviation; Chromium; Chromium, standard deviation; Cobalt; Cobalt, standard deviation; Copper; Copper, standard deviation; DEPTH, sediment/rock; Energy dispersive X-ray analysis, EDAX; Gallium; Gallium, standard deviation; GEMAX; GNC_X; Iron; Iron, standard deviation; Manganese; Manganese, standard deviation; Molybdenum; Molybdenum, standard deviation; Nickel; Nickel, standard deviation; Niobium; Niobium, standard deviation; Potassium; Potassium, standard deviation; Rubidium; Rubidium, standard deviation; Rubidium/Strontium ratio; Selenium; Selenium, standard deviation; Strontium; Strontium, standard deviation; Titanium; Titanium, standard deviation; Vanadium; Vanadium, standard deviation; Yttrium; Yttrium, standard deviation; Zinc; Zinc, standard deviation; Zirconium; Zirconium, standard deviation; Zirconium/Niobium ratio; Zirconium/Strontium ratio
    Type: Dataset
    Format: text/tab-separated-values, 1525 data points
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    DATA PANGAEA
  • 7
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    Geochemistry of sediment core ARA-4/97-B1 (1999)
    PANGAEA
    Details
    Publication Date: 2023-03-07
    Keywords: ARA-4/97; ARA-4/97-B1; Aranda (1989); Arsenic; Arsenic, standard deviation; Baltic Sea System Study; BASYS; Bornholm Basin, Baltic Sea; Bromine; Bromine, standard deviation; Calcium; Calcium, standard deviation; Chromium; Chromium, standard deviation; Cobalt; Cobalt, standard deviation; Copper; Copper, standard deviation; DEPTH, sediment/rock; Energy dispersive X-ray analysis, EDAX; Gallium; Gallium, standard deviation; Gemini Niemistoe Corer; GNC; Iron; Iron, standard deviation; Manganese; Manganese, standard deviation; Molybdenum; Molybdenum, standard deviation; Nickel; Nickel, standard deviation; Niobium; Niobium, standard deviation; Potassium; Potassium, standard deviation; Rubidium; Rubidium, standard deviation; Rubidium/Strontium ratio; Selenium; Selenium, standard deviation; Strontium; Strontium, standard deviation; Titanium; Titanium, standard deviation; Vanadium; Vanadium, standard deviation; Yttrium; Yttrium, standard deviation; Zinc; Zinc, standard deviation; Zirconium; Zirconium, standard deviation; Zirconium/Niobium ratio; Zirconium/Strontium ratio
    Type: Dataset
    Format: text/tab-separated-values, 1185 data points
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    DATA PANGAEA
  • 8
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    Geochemistry of sediment core ARA-6/98-BBTA (1999)
    PANGAEA
    Details
    Publication Date: 2023-03-07
    Keywords: ARA-6/98; ARA-6/98-BBTA; Aranda (1989); Arsenic; Arsenic, standard deviation; Baltic Sea System Study; BASYS; Bornholm Basin, Baltic Sea; Bromine; Bromine, standard deviation; Calcium; Calcium, standard deviation; Chromium; Chromium, standard deviation; Cobalt; Cobalt, standard deviation; Copper; Copper, standard deviation; DEPTH, sediment/rock; Energy dispersive X-ray analysis, EDAX; Gallium; Gallium, standard deviation; GEMAX; GNC_X; Iron; Iron, standard deviation; Manganese; Manganese, standard deviation; Molybdenum; Molybdenum, standard deviation; Nickel; Nickel, standard deviation; Niobium; Niobium, standard deviation; Potassium; Potassium, standard deviation; Rubidium; Rubidium, standard deviation; Rubidium/Strontium ratio; Selenium; Selenium, standard deviation; Strontium; Strontium, standard deviation; Titanium; Titanium, standard deviation; Vanadium; Vanadium, standard deviation; Yttrium; Yttrium, standard deviation; Zinc; Zinc, standard deviation; Zirconium; Zirconium, standard deviation; Zirconium/Niobium ratio; Zirconium/Strontium ratio
    Type: Dataset
    Format: text/tab-separated-values, 1513 data points
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    DATA PANGAEA
  • 9
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    Geochemistry of sediment core IOW009602-2NC-3 (1999)
    PANGAEA
    Details
    Publication Date: 2023-03-07
    Keywords: Arsenic; Arsenic, standard deviation; Baltic Sea System Study; BASYS; Bromine; Bromine, standard deviation; Calcium; Calcium, standard deviation; Chromium; Chromium, standard deviation; Cobalt; Cobalt, standard deviation; Copper; Copper, standard deviation; DEPTH, sediment/rock; Energy dispersive X-ray analysis, EDAX; Gallium; Gallium, standard deviation; Gotland Basin; Gulf of Riga; IOW009602-2NC-3; Iron; Iron, standard deviation; KOT00/96/02; Manganese; Manganese, standard deviation; Molybdenum; Molybdenum, standard deviation; NC; Nickel; Nickel, standard deviation; Niemistoe corer; Niobium; Niobium, standard deviation; Petr Kottsov; Potassium; Potassium, standard deviation; Rubidium; Rubidium, standard deviation; Rubidium/Strontium ratio; Selenium; Selenium, standard deviation; Strontium; Strontium, standard deviation; Titanium; Titanium, standard deviation; Vanadium; Vanadium, standard deviation; Yttrium; Yttrium, standard deviation; Zinc; Zinc, standard deviation; Zirconium; Zirconium, standard deviation; Zirconium/Niobium ratio; Zirconium/Strontium ratio
    Type: Dataset
    Format: text/tab-separated-values, 1695 data points
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  • 10
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    Geochemistry of sediment core IOW009602-2NC-5 (1999)
    PANGAEA
    Details
    Publication Date: 2023-03-07
    Keywords: Arsenic; Arsenic, standard deviation; Baltic Sea System Study; BASYS; Bromine; Bromine, standard deviation; Calcium; Calcium, standard deviation; Chromium; Chromium, standard deviation; Cobalt; Cobalt, standard deviation; Copper; Copper, standard deviation; DEPTH, sediment/rock; Energy dispersive X-ray analysis, EDAX; Gallium; Gallium, standard deviation; Gotland Basin; Gulf of Riga; IOW009602-2NC-5; Iron; Iron, standard deviation; KOT00/96/02; Manganese; Manganese, standard deviation; Molybdenum; Molybdenum, standard deviation; NC; Nickel; Nickel, standard deviation; Niemistoe corer; Niobium; Niobium, standard deviation; Petr Kottsov; Potassium; Potassium, standard deviation; Rubidium; Rubidium, standard deviation; Rubidium/Strontium ratio; Selenium; Selenium, standard deviation; Strontium; Strontium, standard deviation; Titanium; Titanium, standard deviation; Vanadium; Vanadium, standard deviation; Yttrium; Yttrium, standard deviation; Zinc; Zinc, standard deviation; Zirconium; Zirconium, standard deviation; Zirconium/Niobium ratio; Zirconium/Strontium ratio
    Type: Dataset
    Format: text/tab-separated-values, 2307 data points
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    DATA PANGAEA
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