Geologos, 2011, 17, 4
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Browsing Geologos, 2011, 17, 4 by Subject "Grain-size distribution"
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Item Adjustment coefficients for planimetric analysis of the granulometry of coarse-grained sediments(Wydawnictwo Naukowe UAM, 2011) Pisarska-Jamroży, Małgorzata; Kossowski, Tomasz; Jamroży, JerzyThe relationship between results from granulometric analyses of by sieving and by planimetry was investigated by numerical simulation of cubes filled with boulders, cobbles and pebbles. Cross-sections through the sediment were simulated and compared with photos of an actual outcrop wall. Volumes estimated on the basis of planimetric analysis using the cross-sections were compared with sieve analyses, thus allowing to determine adjustment coefficients. The coefficients for pebbles and cobbles have a small standard error, but are larger for boulders, which might be a consequence of too small areas formed by the cross-sections.Item Alternative interpretations of grain-size data from Quaternary deposits(Wydawnictwo Naukowe UAM, 2011) Mycielska-Dowgiałło, Elżbieta; Ludwikowska-Kędzia, MałgorzataSeveral possibilities to present and to interpret the results of granulometric analyses of Quaternary fluvial, aeolian, glacial and wash-out slope deposits were investigated. Attention is paid particularly to the cumulative curves at a probability scale and the frequency curves, and it is shown how these curves can help to determine the sedimentary environment. The inclination of the cumulative curves in the part of the maximum proportion of a particular grain size appears significant. It appears possible to obtain information on the density and dynamics of the transporting medium from the course of the cumulative curves (inclination and spread of grain size). The examination of textural parameters allows to draw regression lines characteristic of both deposits from various sedimentary environments and deposits from one single environment but with different histories as to their transport dynamics.