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A technique for quantitatively assessing orientation patterns in sand grain surface microtextures

  • N. K. Tovey
  • D. H. Krinsley
Article

Summary

The microtexture of several sand sized particles has been assessed using the intensity gradient technique. Rosette diagrams quantitatively indicate the extent of orientation in the different directions, and in some cases it is shown that subjective interpretation of micrographs may over emphasize the importance of certain features. By separating the rosette diagrams according to different grouping of the magnitude of the the intensity gradient vector, additional information is available, so that the spread in the orientation of sub-parallel features may be readily assessed Possibilities for material discrimination may also exist when using this technique. A computer simulation proves that the effects seen are real and not a function of the analysis method used.

Keywords

Olivine Point Method Intensity Gradient Etch Pattern Histogram Class 

Une technique permettant d'évaluer quantitativement les cractéristiques d'orientation dans les microtextures de surface des grains de sable

Résumé

La microtexture de particules sableuses a été évaluée en utilisant quantitativement les orientations dans les différentes directions et on montre que dans certains cas l'interprétation subjective de microphotographies peut exagérer l'importance de certaines caractéristique. En séparant les diagrammes polaires en groupes dépendant de la grandeur du vecteur gradient d'intensité, on dispose d'informations complémentaires. On a également des possiblités de discrimination des natures de grains en utulisant cette technique. Une simulation sur ordinateur a prouvé que les effets observés sont réels et ne dépendent pas de la méthode d'analyse utilisée.

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References

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Copyright information

© International Association of Engineering Geology 1990

Authors and Affiliations

  • N. K. Tovey
    • 1
  • D. H. Krinsley
    • 2
  1. 1.School of Environmental SciencesUniversity of East AngliaNorwichUK
  2. 2.Department of GeologyArizona State UniversityTempeUSA

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