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An Analysis of the Deformation in a Fold in North-east Tasmania*

Published online by Cambridge University Press:  01 May 2009

Emyr Williams
Emyr Williams
Affiliation:
Geological Survey, Department of Mines, Box 124b, G. P. O., Hobart, Tasmania, Australia.
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Abstract

Microscope studies of a flattened fold are consistent with conclusions from macroscopic observations that whereas mudstone cleavage development may have resulted from a laminar-type flow governed by competent confining sandstone beds, the sandstone cleavage appears to be related to the dilation of texture during the early stages of deformation. Continued deformation results in a textural disruption of the initially competent sandstone, which is considered to allow flattening.

Type
Articles
Information
Geological Magazine , Volume 103 , Issue 2 , April 1966 , pp. 115 - 119
Copyright
Copyright © Cambridge University Press 1966

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Footnotes

*

Published by permission of Department of Mines, Tasmania.

References

REFERENCES

Ramsay, J. G., 1962. The geometry and mechanics of formation of “similar” type folds. J. Geol., 70, 309–327.CrossRefGoogle Scholar
Sitter, L. U. de, 1958. Boudins and parasitic folds in relation to cleavage and folding. Geol. en Mijnb. 277–286.Google Scholar
Williams, E., 1959. The sedimentary structures of the Upper Scamander sequence and their significance. Pap. Proc. Roy. Soc. Tasmania, 93, 29–32.Google Scholar
Williams, E., 1961. The deformation of confined, incompetent layers in folding. Geol. Mag., 98, 317–323.CrossRefGoogle Scholar
Williams, E., 1965. The deformation of competent granular layers in folding. Amer. J. Sci., 263, 229–237.CrossRefGoogle Scholar