Hostname: page-component-76dd75c94c-5fx6p Total loading time: 0 Render date: 2024-04-30T08:20:45.542Z Has data issue: false hasContentIssue false
  • English
  • Français

Fold Structures in the Dalradian Rocks of Knapdale, Argyllshire

Published online by Cambridge University Press:  01 May 2009

John L. Roberts
John L. Roberts
Affiliation:
110 Garnge Loan, Edinburgh, 9.
Get access Rights & Permissions [Opens in a new window]

Abstract

In the Dalradian rocks of Knapdale in south-west Argyll two groups of minor folds have been developed which share the same axial plane; their fold axes lie at right angles to each other within the common axial plane. Field evidence indicates that the two fold groups are strictly contemporaneous. One group of minor folds plunges at 40° to 020° N., and the other group plunges at 45° to 235° N., the common axial plane dipping at 70° to 305° N. Major structures parallel to both sets of minor folds are developed in the area. The fabric diagram of the fold groups shows tetragonal symmetry and this is taken to indicate that the stress field responsible for the deformation had itself tetragonal symmetry. The maximum compressive stress acted almost horizontally in a N.W.–S.E. direction while extension took place equally in all directions in a plane normal to the axis of maximum compression. The relations of contemporaneous fold structures to three basic strain patterns are briefly discussed.

Type
Articles
Information
Geological Magazine , Volume 96 , Issue 3 , June 1959 , pp. 221 - 229
Copyright
Copyright © Cambridge University Press 1959

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

IV. REFERENCES

Anderson, E. M., 1942. Dynamics of Faulting and Dyke Formation with Application to Britain. Edinburgh.Google Scholar
Elles, G. L., and Tilley, C. E., 1930. Metamorphism in Relation to Structure in the Scottish Highlands. Trans. Roy. Soc. Edin., lvi, 621.Google Scholar
Geological Survey of Scotland, 1911. Mem. 28. The Geology of Knap-dale, Jura and North Kintyre. H.M. Stat. Office.Google Scholar
Harland, W. B., and Bayly, M. B., 1958. Tectonic Regimes. Geol. Mag., xcv, 89–104.CrossRefGoogle Scholar
King, B. C., and Rast, N., 1956. The Small Scale Structures of South-eastern Cowal, Argyllshire. Geol. Mag., xciii, 185–196.Google Scholar
Knill, L. J., and Knill, D. C., 1958. Some Discordant Fold Structures from the Dalradian of Craignish, Argyll and Rossguill, Co. Donegal. Geol. Mag., xcv, 497–510.Google Scholar
Weiss, L., 1958. Structural Analysis of the Basement System of Turoka, Kenya. Overseas Geol. and Min. Res., vii, 3–35, 123–153.Google Scholar
Wiseman, J. D. H., 1934. The Central and South-west Highland Epidiorites, etc., Quart. Journ. Geol. Soc., xc, 354–417.CrossRefGoogle Scholar