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(b)
Figure 11.30.
(b) Tesselated granite surface on the lower slopes of Domboshawa, a bornhardt located a few
kilometres northeast of Harare, in Zimbabwe.
11.5
TESSELATED PAVEMENTS
Possibly related to polygonal cracking are the patterns of random cracks which in places produce tes-
selated pavements in granite. One occurrence can be seen on Boulder Rock, in the Darling Ranges,
east of Perth, Western Australia (Fig. 11.30a). There the cracks are indurated with iron oxide derived
from a Cretaceous lateritic/bauxitic surface of which remnants persist nearby. Other tesselated pave-
ments have been noted on Domboshawa, a granite bornhardt located a few kilometres northeast of
Harare, Zimbabwe (Fig. 11.30b). There the pavement, which shows no obvious iron staining, is clearly
exposed from beneath a thin regolith.
REFERENCES
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Science 3: 376-390.
Boissonnas, J. 1974. Les granites a structures concentriques et quelques autres granites tardifs de la chaîne
pan-africaine en Ahaggar, (Sahara Central, Algérie). Centre de Recherches sur les zones arides-Bureau de
Recherches Géologiques et Minièrs. Serie Géologie 16. Orleans, France.
Coates, D.R. 1964. Some cases of residual stress effects in engineering work. In Judd W.R. (Ed.), The State of
Stress in the Earth's Crust. Elsevier, New York. pp. 679-688.
Ikeda, H. 1996. A strong earthquake and the changes it caused in granitic landscape: the case of
Mt Rokko due to the Great Hanshin Earthquake of 1995. Memoirs of Nara University 24: 105-116.
Jennings, J.N. and Twidale, C.R. 1971. Origin and implications of the A-tent, a minor granite landform.
Australian Geographical Studies 9: 41-53.
Johnson, R.J. 1927. Polygonal weathering in igneous and sedimentary rocks. American Journal of Science 13:
440-444.
Leonard, R.J. 1929. Polygonal cracking in granite. American Journal of Science 18: 487-492.
Netoff, D.I. 1971. Polygonal jointing in sandstone near Boulder, Colorado. The Mountain Geologist 8: 17-24.
Plug, C. and Plug, I. 1998. Popups on Moon Rock, Augrabies Falls National Park. Koedoe 40(2): 75-84.
 
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