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2 Dąbski M.

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Determining rock surface micro-roughness and search for new method of relative dating of glacial landforms : a case study from Fláajökull (SE Iceland) and Biferten glacier (Swiss Alps) forefields

Dąbski M.

Landform Analysis

2012

Vol. 21

3-8

Micro-roughness was recorded on glacially abraded stones deposited since Little Ice Age by two glaciers: Fláajökull in SE Iceland (basalts) and Biferten glacier in Swiss Alps (limestones) in order to find indices of relative age of the glacial landforms. Micro-roughness of rock surfaces was analysed with use of Handysurf E35-B electronic profilometer which calculates following roughness parameters: Rz, Rzmax, Ra and Rsm. An increase in roughness parameters towards older moraines is observed in both forefields, however the change is more significant on limestone surfaces. Time-dependent surface deterioration is visible only within first decades of weathering of both types of rock, and further weathering does not cause increase in micro-roughness.

Early stages of weathering of glacially - abraded limestone surfaces as determined by various Schmidt hammer tests : Biferten glacier forefield, Glarner Alps (Switzerland)

Dąbski M.

Landform Analysis

2009

Vol. 11

11-15

The Schmidt hammer method was successfully used in determining early stages of weathering of glacially-abraded Jurassic limestone surfaces within the post-LIA forefield of the Biferten glacier (Switzerland).It was shown that the formerly glaciated landforms are differentiated in terms of mean and maximum R-values and when comparing between standard deviation of R-values from polished and non-polished surfaces.It is concluded that the most important factors in R-value differentiation within the young marginal zones are duration of weathering and rock structure.However, the first factor can only be detected on non-polished surfaces.