Karst table
Karst tables , also known as corrosion tables or lime denudation tables , are small forms of the karst that “consist of a non-local cover block over a base of lime that rises above the exposed limestone soil by a certain amount . They are created by chemical dissolution of the soil, from which it is protected under the block. "
Discovery and Description
The discovery of this phenomenon on the Dachstein can be attributed to Roman Moser , who reported in his dissertation on the Dachstein glacier about karst tables in the run-up to the Great Gosau Glacier and the Schneeloch Glacier .
Roman Moser came to the conclusion that an average base height of 10 to 15 cm would require approx. 10,000 years of ice-free terrain. It received these values on the basis of observations on “down areas” at the Schreiberwandeck and in the run-up to the Schneeloch Glacier, which would have become ice-free around 10,000 years ago. However, these values are problematic because the Daun and Egesen areas in the further run-up to the Great Gosau Glacier and the Schneeloch Glacier have not yet been clearly recorded and furthermore a significantly older date is given for the Daun high altitude today. However, since R. Hochhold found and documented several karst tables with base heights of up to 10 cm on Egesenboden (Younger Dryas) in the run-up to the Hallstatt Glacier , especially in the Wildkar, the value Mosers (1956: 506) can be 10 to 15 cm / 10,000 years are still valid as the upper limit.
The base height is generally very dependent on the size of the cover block, the rock strength of the subsoil and, above all, the topographical location. So could z. For example, the base heights of 1 to 10 cm can be found under a block in the Wildkar, and rock drilling in the vicinity of the Simonyhütte also resulted in completely different rock hardnesses in the immediate vicinity.
In summary, it can be stated that a general indication of the denudation amount on the Dachstein is very difficult due to various influences, an upper limit of 10 to 15 cm in 10,000 to 12,000 years (therefore in 100/120 years 1 to 1.5 mm and in 1000/1200 years 1–1.5 cm) but can be represented well.
literature
- Rainer Hochhold: The glaciers of the Dachstein group. Glacier research at the Geogr. Institute of the University of Innsbruck. 1978, 157 pp.
- Hans Kinzl: The karst tables - a means of measuring the lime removal. In: Communications from the Austrian Geographic Society. Volume 117, 1975, pp. 290-303.
- Roman Moser: The glaciation on the Dachstein and its traces in advance. Dissertation at the University of Innsbruck. 1954, 250 pp.
- Roman Moser: About the removal in the Dachstein area. New ways of measuring the denudation of periglacial karst plateaus with the help of the "corrosion table method" In: Yearbook of the Upper Austrian Museum Association. Volume 101, Linz 1956, pp. 305-308 ( PDF on ZOBODAT ).
- Roman Moser: Limestone tables in the Dead Mountains and in the Dachstein area. In: Yearbook of the Austrian Alpine Club. Volume 92, 1967, pp. 75-78.
- Gernot Patzelt: The late glacial stages and postglacial fluctuations of Eastern Alpine glaciers. In: Reports of the German Botanical Society. Volume 85, Issue 1-4, 1972, pp. 47-57.