Contributions to Mineralogy and Petrology

, Volume 31, Issue 1, pp 39–66 | Cite as

Dreiaxiale verformungen an Solnhofener Kalkstein im Temperaturbereich von 20–650° C. Röntgenographische Gefügeuntersuchungen mit dem Texturgoniometer

  • Hartmut Kern
Article
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Experimental triaxial deformation of solnhofen limestone in the range of 20° to 650° C.-Petrofabric analysis by means of the X-ray diffractometer

Abstract

Axial-symmetric and real triaxial deformation tests on Solnhofen limestones were made in the range of 20 to 650° C. Stress, strain and time observations as functions of temperature and the ratios of the external stresses are plotted as stress-strain and strain-time curves. Mechanical twinning on e (01¯12) and syntectonic recrystallization (at temperatures above 500° C) is assumed to be the dominant flow mechanism. On samples of high permanent strain the textural changes and development of preferred orientations were investigated by means of the X-ray diffractometer. In all tests the symmetry of the polefigures is exactly identical with the symmetry of the external stress-field.

In tests with σ1>σ2=σ3 the poles of the planes investigated (10¯11; 10¯12; 11¯20) occupy girdles about the unique principle compressive axis. When all principle stresses are different (σ1>σ2>σ3) the poles of the planes investigated tend to maxima (in the case of plane strain) ore to girdle-occupations about the principle axis of maximum extension. The deduced c-diagrams show a fairly similar tendency of the spacial orientations.

The pole figures (as well as the calculated orientation of the c-axis) must be explained by the superposition of reflected intensities on planes in twinned and untwinned grains. In every diagram partial occupations—possibly representing the orientations of twinned grains-are in fairly good agreement with the orientation predicted by the theory of Brace-MacDonald for the stable orientation of anisotropic minerals in a non-hydrostatic stress-field.

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Copyright information

© Springer-Verlag 1971

Authors and Affiliations

  • Hartmut Kern
    • 1
  1. 1.Mineralogisch-Petrographisches Institut der Universität KielDeutschland

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