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Winn, Kyaw; Erlenkeuser, Helmut; Nordberg, Kjell; Gustafsson, Mikael (1998): Age determination and stable isotope ratios of three sediment cores from the Great Belt. PANGAEA,, Supplement to: Winn, K et al. (1998): Paleohydrography of the Great Belt, Denmark, during the Littorina Transgression: the isotope signal. Meyniana, 50, 237-251,

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The marine transgression Into the Baltic Sea through the Great Belt took place around 9,370 calibrated C-14-years B.P. The sedimentary sequence from the early brackish phase and the change to marine conditions has been investigated in detail through C-14-datings, and oxygen and carbon isotope measurements, and is interpreted by comparison with modern analogs.
The oldest brackish sediments are the strongly laminated clays and silts rich in organic carbon followed by non-laminated heavily bioturbated silts. The bedding and textural characteristics and stable isotope analyses on Ammonia beccarii (dextral) and A. beccarii (sinistral) show that the deposltlonal conditions respond to a change at about 9,100 cal. a B.P. from an unstratified brackish water environment in the initial stage of the Littorina Transgression to a thermohaline layered milieu in the upper unit. The oxygen isotope results indicate that the bottom waters of this latter period had salinities and temperatures comparable to the present day Kiel Bay waters. The isotopic composition of the total organic carbon and the d13C-values of A. beccarii reveal a gradual change from an initially lacustrine/terrestrial provenance toward a brackish/marine dominated depositional environment. A stagnation of the sea level at around 9,100 to 9,400 B.P. is indicated.
Related to:
Winn, Kyaw (1974): Present and postglacial sedimentation in the Great Belt Channel (Western Baltic). Meyniana, 26, 63-101,
Median Latitude: 55.310457 * Median Longitude: 10.968375 * South-bound Latitude: 55.085830 * West-bound Longitude: 10.933000 * North-bound Latitude: 55.404000 * East-bound Longitude: 11.015500
Date/Time Start: 1972-11-15T00:00:00 * Date/Time End: 1994-01-29T00:00:00
GIK12522-2 * Latitude: 55.376000 * Longitude: 10.933000 * Date/Time: 1972-11-15T00:00:00 * Elevation: -26.0 m * Recovery: 1.32 m * Location: Great Belt, western Baltic Sea, off Denmark * Campaign: GIK-cruise * Device: Gravity corer (Kiel type) (SL) * Comment: 0-8 cm: soft dark grey mud (Unit G); 8-66 cm grey sandy mud with Cerastoderma edule layer at 12 cm, occassional isolated shells (Unit D); 66-67 cm: reddish tint, sandier; 67-118:Olive brown clays, reddish brown in bands to 1.1 cm thick, also lighter bands. Shell fragments more abundant in lower part of core (Unit C); 118-132 cm: dark brown muddy peat, increasing organic content with depth (Unit B).
GIK12523-1 * Latitude: 55.404000 * Longitude: 10.992000 * Date/Time: 1972-11-15T00:00:00 * Elevation: -23.5 m * Recovery: 3.005 m * Location: Great Belt, western Baltic Sea, off Denmark * Campaign: GIK-cruise * Device: Box corer (BC) * Comment: 0-19.8 cm: dark olive grey, very soft muddy sand (Unit G); 19.8-30 cm: dark grey compacter muddy sand (Unit D); 30-152 cm: grey, clay with light to dark grey at 66-68 cm, and shell fragments, abundant at 91.3-92.2 cm, 143.6-146.5 cm (Unit D); 152-300.5 cm clay as above, shell layers at 161.5-163.3 cm, 200-210 cm (Cerastoderma sp., more compact below 163 cm.
GIK12594-2 * Latitude: 55.085830 * Longitude: 11.015500 * Date/Time: 1994-01-29T00:00:00 * Elevation: -39.6 m * Recovery: 2.55 m * Location: Großer Belt, Nord-Langelandbelt * Campaign: GIK-cruise * Device: Gravity corer (Kiel type) (SL) * Comment: 0-20 cm:dark grey, fine to medium grained clayey sand; 20-41 cm:dark grey to grey sand; 41-90.5 cm:fine grained sand with peat and wood pieces abundant 86-90.5 cm; 90.5-104 cm:grey sandiger clay with shell fragments; 104-110.8 cm:sandy clay with small shells, abundant scattered peat and layers rich in organic matter (0-110.8 is Unit E); 110.8-142.5 cm (transition Unit E to D):more lightly laminated, grey clays with scattered pieces of peat, forming layers around 129 cm; 142.5-253 cm Unit D):thin alternations of light grey to grey, fine to medium grained sands, calcareous as above, with grey clays (mm-thick laminations, varve-like).
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