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- Beylich, Achim, A., et al.
(författare)
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Experimental weathering of selected non-calcareous rock types under wet/moist conditions
- 2007
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Ingår i: Zeitschrift für Geomorphologie. - 0372-8854. ; 51:1, s. 1-26
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Tidskriftsartikel (refereegranskat)abstract
- This experiment outlines chemical and physical weathering of selected non-calcareous rock types during the time between November 2002 and February/March 2004. Parallel series of rock specimens were placed in boxes and half covered by water. One set was exposed to different temperature amplitudes in a freeze room, i.e., a simulated periglacial environment, another set was placed outdoor in a temperature environment with a mean annual temperature of c. +6°C, and four samples were placed in an office with a temperature of 21°C ± 3°C throughout. Electric conductivity, ion composition and pH values of the water together with the resulting amount of debris were determined for all samples at the termination of the experiment. In addition the electric conductivity and the debris were noted at intervals during the experiment. All samples experienced chemical weathering and the Freeze room and the Outdoor samples also underwent physical weathering to various extent. Generally speaking the highest degree of physical weathering was found in the Freeze room samples, but the pattern was not consistent. The relative importance of chemical weathering on the other hand seems more related to rock type than to environmental conditions. In single cases there are hints to suggest quantitative dominance of chemical over physical weathering in the Freeze room series. A tentative relationship between weathering of the respective rock types and the landforms in the areas of their origin could be noted. In spite of the low sample number and simple investigation methods the results suggest that rates of chemical and physical weathering as well as their mutual importance is more complex than traditionally believed.
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