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Jointing along the Swansea Valley Disturbance between Clydach and Hay-on-Wye, South Wales

Published online by Cambridge University Press:  01 May 2009

J. D. Weaver
J. D. Weaver
Affiliation:
Department of Biological and Earth SciencesDerby College of Art and TechnologyKedleston RoadDerby DE3 1GBU. K.
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Summary

Along the length of the Swansea Valley Disturbance, from Clydach (near Swansea) to Hay-on-Wye (Herefordshire), 4 main joint sets are developed. They are NE—SW, NW—SE, N—S and E—W in trend. On the NW and SE sides of the main fault zone only the N—S and E—W sets tend to be developed, whereas within this fault zone only the NE—SW and NW—SE sets are found. It is suggested that the NE—SW and NW—SE sets are shear joints developed at the same time as the main fault zone and the N—S and E—W sets have been developed in response to the release of residual strain energy after the end of the Variscan orogeny.

Type
Articles
Information
Geological Magazine , Volume 111 , Issue 4 , July 1974 , pp. 329 - 336
Copyright
Copyright © Cambridge University Press 1974

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References

Hancock, P. L. 1968. Joints and faults: The morphological aspects of their origins. Proc. Geol. Ass. 79, 141–51.CrossRefGoogle Scholar
Price, N. J. 1966. Fault and Joint Development in Brittle and Semi-Brittle Rock. Pergamon Press.Google Scholar
Wager, L. R. 1931. Jointing in the Great Scar Limestone of Craven and its relation to the Tectonics of the Area. Q. Jl geol. Soc. Lond. 87, 392–424.CrossRefGoogle Scholar