Journal of Materials Science

, Volume 12, Issue 5, pp 893–903 | Cite as

The direct observation and analysis of dislocations in experimentally deformed plagioclase feldspars

  • D. B. Marshall
  • A. C. McLaren


Transmission electron microscopy has been used to observe and analyse the dislocations in a series of plagioclase feldspars which had been experimentally deformed in compression. The results indicate that a moving dislocation in these materials leaves behind a fault in the structure. Two types of fault are observed but both define the slip plane of the associated dislocation. From these observations, together with stuctural considerations, the visibility of the dislocations and the orientatation of the applied shear stress it has been possible to determine the slip system uniquely for a number of dislocations. The origin of the dislocations and the nature of the faults are also discussed.


Polymer Microscopy Electron Microscopy Transmission Electron Microscopy Shear Stress 
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  1. 1.
    I. Y. Borg and H. C. Heard, Contr. Mineral. and Petrol. 23 (1969) 128.Google Scholar
  2. 2.
    Idem, “Experimental and Natural Rock Deformation” (Springer Verlag, Berlin, 1970) p. 375.Google Scholar
  3. 3.
    G. W. Lorimer, P. E. Champness and E. T. C. Spooner, Nature P239 (1972) 108.Google Scholar
  4. 4.
    G. W. Lorimer, H. Nissen and P. E. Champness, Schweiz. Mineral. Petrog. Mitt 54 (1974) 707.Google Scholar
  5. 5.
    S. White, Contr. Mineral. and Petrol. 50 (1975) 289.Google Scholar
  6. 6.
    D. B. Marshall and C. J. L. Wilson, ibid (1975) 289.Google Scholar
  7. 7.
    J. S. Lally, R. M. Fisher, J. M. Christie, D. T. Griggs, A. H. Heuer, G. L. Nord and S. V. Radcliffe, Proceedings of the Third Lunar Science Conference, Houston, Vol. 1 (1972).Google Scholar
  8. 8.
    J. V. Smith, “Feldspar Minerals”, Vol. 1 (Springer Verlag, Berlin, 1974).Google Scholar
  9. 9.
    A. C. McLaren and D. B. Marshall, Contr. Mineral. and Petrol. 44 (1974) 237.Google Scholar
  10. 10.
    A. K. Head, P. Humble, L. M. Clarebrough, A. J. Morton and C. T. Forward, “Computed Electron Micrographs and Defect Identification” (North-Holland, Amsterdam, 1973).Google Scholar
  11. 11.
    A. C. McLaren, R. G. Turner, J. N. Boland and B. E. Hobbs, Contr. Mineral. and Petrol. 29 (1970) 104.Google Scholar
  12. 12.
    D. J. Morrison-Smith, Ph.D. Thesis, Australian National University, Canberra (1974).Google Scholar
  13. 13.
    L. M. Clarebrough, Phys. Stat. Sol. (a) 18 (1973) 427.Google Scholar
  14. 14.
    Idem, ibid 32 (1975) K5.Google Scholar
  15. 15.
    J. P. Hirth and J. Lothe, “Theory of Dislocations” (McGraw-Hill, New York, 1968).Google Scholar
  16. 16.
    J. C. M. Li, Trans. Met. Soc. AIME 227 (1963) 239.Google Scholar
  17. 17.
    J. S. Williams, B. R. Lawn and M. V. Swain, Phys. Stat. Sol. (a) 2 (1970) 7.Google Scholar
  18. 18.
    R. W. Cahn, Adv. Phys. 3 (1954) 363.Google Scholar

Copyright information

© Chapman and Hall Ltd. 1977

Authors and Affiliations

  • D. B. Marshall
    • 1
  • A. C. McLaren
    • 1
  1. 1.Department of PhysicsMonash UniversityClaytonAustralia

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