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Sedimentpetrographie und Geochemie der Moränen

  • S. Christensen
Conference paper

Summary

Chemical and physical investigations of stratigraphically different tills in North Germany were carried out, in order to obtain the lithological parameters which could have an influence on geotechnical parameters and shear wave velocities within glacial tills.

Aim and ränge of this study resulted from the objectives of the research projects “Geotechnics of moraines in North Germany” directed by E.F. GRUBE, “Lithological reconnaissance of near-surface sediments by compression and shear waves” directed by R. MEISSNER and “Geotechnics of moraines in North Germany” directed by K. WÜSTENHAGEN. This study can therefore not be considered as an independent research project.

The results of these investigations show, that the stratigraphically different tills of the Weichselian, middle and older Saalian glaciations are characterized by specific grain size distributions and carbonate contents. The tili of the Drenthe-stadium shows a grain size distribution, which is not favourable for compaction, and a low carbonate content. In the tili of the Niendorf-formation an increased silt fraction with a corresponding low sand content is to be found. Due to this grain size distribution and a mean carbonate content of about 25 percent a decrease of porosity and an increase of shear wave velocity can be expected, depending on the preconsolidation load by glacial ice.

Sufficient data are not available for the definition of a typical grain size distribution pattern of the Weichselian tili. This tili shows a grain size distribution nearly corresponding to the “Fuller”- curve. It can therefore be regarded as favourable for compaction. Nevertheless a lower firmness of the Weichselian tili can be observed in the outcrop despite the high carbonate content of 20 percent, when compared with the tili of the Niendorf-formation. This might be due to the lower preconsolidation load by ice pressure.

Weathering processes led to mobilisation, migration and deposition of iron, manganese, aluminium and calcium resulting in a secondary density increase in a depth of 3 – 5 m below the surface of the tills at Emmerlev Kliff and Brodtener Ufer.

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Literatur

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Copyright information

© Springer-Verlag Berlin Heidelberg 1985

Authors and Affiliations

  • S. Christensen
    • 1
  1. 1.Geologisches Landesamt Schleswig-HolsteinKielGermany

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