, Volume 27, Issue 4, pp 371–378 | Cite as

The character of the fine fractions of the bottom sediments of the Bohemian part of the Labe (Elbe) river

  • Borovec Z. 


The amounts of fractions with size ≦63 œm in the bottom sediments of the Bohemian part of the Labe (Elbe) river is variable. The grain-size distribution is poorly to very poorly sorted with a mean particle size from 5.1 to 12.2 œm.

The crystalline phase of recent sediments of the Labe river draining various types of parent rocks has a simple mineral composition, with predominant mica/illite, quartz, kaolinite and chlorite (±vermiculite ±smectite). There are also very small amounts of interstratification of 10 Å and 14 Å sheet silicates (11–13.6 Å). Small amounts of Na-rich plagioclase, K-feldspar and calcite have also been found; accessory amounts of amphibole, authigenic gypsum and pyrite are also present. Opal in diatomic tests is an omnipresent constituent. In the amorphic inorganic phase, hydrated oxides predominate, where Si >Al >Fe >Mn in a ratio of 64:28:22:1. The greatest amount of amorphous inorganic and organic phases were found in the ≦4 œm fraction.

A considerable part of the detrital material originates from soils formed on various igneous, metamorphic and sedimentary rocks, transported to the Labe by other rivers or directly by erosion in the immediate vicinity of the Labe river.


Calcite Pyrite Gypsum Kaolinite Chlorite 
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Copyright information

© Kluwer Academic Publishers 1992

Authors and Affiliations

  • Borovec Z. 
    • 1
  1. 1.Department of PetrologyCharles UniversityPraha 2Czechoslovakia

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