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Hertzian fracture, a principal mechanism in the emplacement of the British Tertiary intrusive centres

Published online by Cambridge University Press:  01 May 2009

Dov Bahat
Affiliation:
Department of Geology and Mineralogy, Ben Gurion University of the Negev, Beer Sheva, Israel

Summary

In the British Tertiary intrusive centres emplacement of cone-sheets, ring-dykes and related magmatic bodies followed in shape and sequence the pattern of Hertzian fracture produced in the country rock by the magmatic diapir. In Ardnamurchan doming of the country rock, conic fracture and intrusion of cone-sheets started the development of the intrusive centre. Following that, pressure was reduced and strain relaxation occurred which resulted in arcuate and median fractures. These fractures were later on intruded by magma, hence ring-dykes (curved flanges) were formed. Resumption of pressure initiated the second cycle of cone fractures (and inner cone-sheets of centre 2).

Type
Articles
Copyright
Copyright © Cambridge University Press 1980

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References

Anderson, E. M. 1936. The dynamics of the formation of cone sheets, ring-dykes, and cauldron-subsidences. Proc. R. Soc. Edinb. 56, 128–57.CrossRefGoogle Scholar
Bahat, D. 1977. Thermally-induced wavy Hertzian fracture. J. Am. Ceram. Soc. 60, 118–20.CrossRefGoogle Scholar
Bahat, D. 1978. Hertzian fracture: a sound physical basis for the explanation of carbonatite structure. Scientific Colloquium, in Honour of Geoguel, Orleans, France. Mém. B.R.C.M. 91, 275–83.Google Scholar
Bahat, D. 1979(a). Theoretical considerations on mechanical parameters of joint surfaces based on studies on ceramics. Geol. Mag. 116, 8192.CrossRefGoogle Scholar
Bahat, D. 1979(b). Interpretation on the basis of Hertzian theory of a spiral carbonatite structure at Homa Mountain, Kenya. Tectonophysics (in the press).CrossRefGoogle Scholar
Bailey, E. B., Clough, C. T., Wright, W. B., Richey, J. E. & Wilson, G. V. 1924. Tertiary and post-Tertiary geology of Mull, Loch Aline, and Oban. Mem. geol. Surv. Scot.Google Scholar
Billings, M. P. 1943. Section of geology and mineralogy. Trans. N.Y. Acad. Sci. Ser. II, 5, 131–44.CrossRefGoogle Scholar
Chapman, C. A. 1966. Paucity of mafic ring-dikes – evidence for floored polymagmatic chambers. Am. J. Sci. 264, 6677.CrossRefGoogle Scholar
Cloos, H. 1929. Kunstliche Gebirge: II. Natur U. Museum, H. 6, 225–43.Google Scholar
de Sitter, L. U. 1964. Structural Geology. McGraw-Hill.Google Scholar
Dunham, A. C. 1968. The felsites, granophyre, explosion breccias and tuffisites of the north eastern margin of the Tertiary igneous complex of Rhum, Inverness-shire. Jl geol. Soc. Lond. 123, 327–52.CrossRefGoogle Scholar
Durrance, E. M. 1967. Photo-elastic stress studies and their applications to a mechanical analysis of the Tertiary ring-complex of Ardnamurchan Argyllshire. Proc. geol. Assoc. Lond. 78, 289318.CrossRefGoogle Scholar
Frank, F. C. & Lawn, B. R. 1967. On the theory of Hertzian fracture. Proc. Roy. Soc. Lond. A. 299, 291306.Google Scholar
Garson, M. S. 1966. Carbonatites in Malawi. In Carbonatites (ed. Tuttle, O. F. and Gittins, J.), pp. 3371. New York: Wiley Interscience.Google Scholar
Harker, A. 1904. The Tertiary igneous rocks of Skye. Mem. geol. Surv. Scot.CrossRefGoogle Scholar
Hertz, H. 1881. Contact of elastic solids. J. Reine Angew. Math. (Crelle) 93, 156–71.Google Scholar
Hills, E. S. 1963. Elements of Structural Geology, London.Google Scholar
Hubbert, M. K. 1937. Theory of scale models as applied to the study of geological structures. Bull. geol. soc. Am. 48, 1459–520.CrossRefGoogle Scholar
Hubbert, M. K. 1951. Mechanical basis for certain familiar geologic structures. Bull. geol. Soc. Am. 62, 355–72.CrossRefGoogle Scholar
Jeffrey, H. 1936. Note on fracture. Proc. R. Soc. Edin. 56, 158–63.CrossRefGoogle Scholar
Kusznir, N. J. & Bott, M. H. P. 1977. Stress concentration in the upper lithosphere caused by underlying visco-elastic creep. Tectonophysics 43, 247–56.CrossRefGoogle Scholar
Lawn, B. R., Wiederhorn, S. M. & Johnson, H. H. 1975. Strength degradation of brittle surfaces: blunt indenters. J. Am. Ceram. Soc. 58, 428–32.CrossRefGoogle Scholar
Lawn, B. R. & Wilshaw, E. 1975. Indentation fracture: principles and applications. J. Mater. Sci. 10, 1049–81.CrossRefGoogle Scholar
Le Bas, M. J. 1971. Cone-sheets as a mechanism of uplift. Geol. Mag. 108, 373–6.CrossRefGoogle Scholar
Le Bas, M. J. 1977. Carbonatite-Nephelinite Volcanism. John Wiley.Google Scholar
Mikosza, A. G. & Lawn, B. R. 1971. Section and etch study of Hertzian fracture mechanics. J. appl. Phys. 42, 5540–5.CrossRefGoogle Scholar
Orowan, E. 1974. Origin of the surface features of the moon. Proc. R. Soc. Lond. A. 336, 141–63.Google Scholar
Reynolds, D. L. 1956. Calderas and ring-complexes. Nederlandsch. Geol. Mijnb. Genoot, Verh. 16, 355–79.Google Scholar
Richey, J. E. 1932. Tertiary ring structures in Britain. Trans. geol. Soc. Glasg. 19, 421040.CrossRefGoogle Scholar
Richey, J. E. & Thomas, H. H. et al. 1930. The geology of Ardnamurchan, north-west Mull and Coll. Mem. geol. Surv. Scot.Google Scholar
Robson, G. R. & Barr, K. G. 1964. The effects of stress on faulting and minor intrusions in the vicinity of a magma body. Bull. Volcanol. 27, 315–29.CrossRefGoogle Scholar
von Eckermann, H. 1966. Progress of research on the Alno carbonatite. In Carbonatites (eds. Tuttle, O. F. and Guttins, J.), pp. 331. New York: Wiley Interscience.Google Scholar
Walker, G. P. L. 1965. A new concept of the evolution of the British Tertiary intrusive centres. J. geol. Soc. Lond. 131, 121–41.CrossRefGoogle Scholar
Wells, M. K. 1953. The structure and petrology of the hypersthene-gabbro intrusion, Ardnamurchan. Q. Jl geol. Soc. Lond. 109, 367–97.CrossRefGoogle Scholar
Wilshaw, T. R. 1971. The Hertzian fracture test. J. Phys. D. 4, 1567–81.Google Scholar