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Was the 4th largest Danish Lake (Mossø) once much larger?

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Water levels of freshwater lakes can lower during the course of an interglacial and sedimentation can infill basins. Besides, wave actions develop spit systems in larger lakes by longshore sediment transport that may cuts of smaller basins. Here, we show combined effects of spit development, wave actions, antecedent topography and lake level changes on the Holocene development of the present-day Danish lake, Mossø. A variety of methods were used: coring, intensive profile digging and remote sensing, geophysical mapping by seismic reflection and electromagnetic induction, and dating by radiocarbon and optically stimulated luminescence. We find that Mossø has undergone water level changes of perhaps 6 m and shore erosion has varied accordingly. The sediment supply for spit formation depended of the vigor of erosion, on wind direction and strength and on building up of the platform in front of the spits. Strong spit activity was identified during three periods: c. 10 ka, 4.2 ka and 2.5-2.0 ka. The location of spit formation was determined by changes in lake level and also local bathymetry and sediment transport patterns. Two spits connected and were reinforced by a beach barrier by 2.5 ka, today constituting the eastern shoreline of present-day Lake Mossø. The data suggests presence of an early Holocene large palaeo-lake Mossø with a 25 km east-west extent from the present-day lakes Skanderborg Sø to Salten Langsø. Confirmation of this paleo-lake requires more investigations, as later erosions at the thresholds that connects Mossø to the adjacent lakes, and to river Gudenå, remains uncertain.
StatusUdgivet - 2018
BegivenhedNordic geological winter meeting 2018 - DTU, Copenhagen, Danmark
Varighed: 10 jan. 201812 jan. 2018


KonferenceNordic geological winter meeting 2018

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