Zur Bildung von Quellmoor-Kuppen mit Quellkalk-Bildungen bei Habernis und Curau (nördliches und mittleres Schleswig-Holstein)


Spring fed raised hummocks with tufa deposits were examined by geological methods and 14C- and pollen-datings at the sites Habernis Au (Schleswig-Flensburg) and Curauer Moor (Eastern Holstein). Spring discharges of confined groundwater occur punctually, linearly or as an irregular areal distribution. These structures are formed either primarily, or by glacitectonic as well as erosive processes. In these locations, dome shaped forms and ridges of organic silt, peat and tufa can develop. Both forms occur in Saalian and Weichselian glacial landscapes. The extent can be up to 160 m in diameter, or respectively, several hundred meters in length and more than 3m in hight. In Habernis, 14C-data from a drilling core in tufa show between 1.82 to 5.43 m below the surface a basically consistent age sequence from Atlantic to early Subboreal (8.065–6.650 cal 14C a BP). Palynological investigations of peat and organic mud in the same core confirm these ages. This tufa sedimentation is short compared to other locations in Central Europe. At Curau, the peat formation is dated between 6.800 and 1.750 cal 14C a BP, therefore it is confined to the Atlantic, Subboreal and the Subatlantic. According to the14C-data, the tufa sedimentation started already at 11.220 cal 14C a BP (early Preboreal) and is therefore long compared to other tufa locations in Central Europe. The geological settings at Habernis and Curau indicate a predominantly climatically controlled tufa precipitation.
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