Hostname: page-component-848d4c4894-jbqgn Total loading time: 0 Render date: 2024-06-14T05:01:59.723Z Has data issue: false hasContentIssue false
  • English
  • Français

The origin of a Pre-Cambrian diorite-granite plutonic series from Pembrokeshire (Wales)

Published online by Cambridge University Press:  01 May 2009

R. S. Thorpe
R. S. Thorpe
Affiliation:
Department of Earth Sciences, The Open University, Walton Hall, Walton Bletchley, Buckinghamshire
Get access Rights & Permissions [Opens in a new window]

Summary

A series of dioritic, granodioritic and granitic igneous rocks, of Pre-Cambrian age, is exposed near Johnston in south Pembrokeshire. Chemical analyses of representative rocks show the suite to be of calcalkaline type. An origin is suggested involving magmatic differentiation of a diorite parent magma, and the granitic rocks are compared with a granophyre of similar composition in north Pembrokeshire.

Type
Articles
Information
Geological Magazine , Volume 107 , Issue 6 , November 1970 , pp. 491 - 499
Copyright
Copyright © Cambridge University Press 1970

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

REFERENCES

Baker, J. W., Lemon, G. G., Gayer, R. A. & Marshman, R. R. 1968. The Dutch Gin Schists. Geol. Mag., 105, 493–4.CrossRefGoogle Scholar
Barth, T. F. W., 1962. Theoretical Petrology. John Wiley and Sons, New York.Google Scholar
Bowen, N. L., 1928. The Evolution of the Igneous Rocks. Dover Publications, New York.Google Scholar
Claxton, C. W., 1963. An occurrence of regionally metamorphosed schists in south-west Pembrokeshire. Geol. Mag., 100, 219–223.CrossRefGoogle Scholar
Green, T. H. & Ringwood, A. E., 1968. Genesis of the calc-alkaline igneous rock suite. Contr. Miner. Petrol., 18, 105–162.CrossRefGoogle Scholar
Gunn, B. M. & Watkins, N. D., 1969. The petrochemical effect of the silmultaneous cooling of adjoining basaltic and rhyolitic magmas. Geochim. cosmochim. Acta. 33, 341–356.CrossRefGoogle Scholar
Holmes, A., 1932. The origin of igneous rocks. Geol. Mag. 69. 36–45.CrossRefGoogle Scholar
Hurley, P. M., 1968. Absolute abundance and distribution of Rb, K and Sr in the earth. Geochim. cosmochim. Acta. 32, 273–283.CrossRefGoogle Scholar
Jones, O. T., 1914. In Strahan, A., Cantrill, T. C., Dixon, E. E. L. & Jones, O. T.: Geology of the South Wales coalfield. Pt. II. The country around Haverfordwest. Mem. geol. Surv. U.K.Google Scholar
Larsen, E. S., 1948. Batholith of southern California. Mem. geol. Soc. Am. 29.Google Scholar
Mathias, M., 1957. The geochemistry of the Messum Igneous Complex S. W. Africa. Geochim. cosmochim. Acta. 12, 29–46.CrossRefGoogle Scholar
Nockolds, S. R., 1934. The production of normal rock types by contamination and their bearing on petrogenesis. Geol. Mag., 71, 31–39.CrossRefGoogle Scholar
Nockolds, S. R. & Allen, R., 1953. The geochemistry of some igneous rock series. Geochim. cosmochim. Acta. 4, 105–142.CrossRefGoogle Scholar
Osborn, E. F., 1962. Reaction series for sub-alkaline igneous rocks based on different oxygen pressure conditions. Am. Miner., 47, 211–226.Google Scholar
Peacock, M. A., 1931. The classification of igneous rock series. J. Geol., 39, 54–67.CrossRefGoogle Scholar
Pringle, J. & George, T. N. 1948. British Regional Geology: South Wales. Mem. geol. Surv. U.K.Google Scholar
Rast, N. & Crimes, T. P., 1969. Caledonian orogenic episodes in the British Isles and their tectonic and chronological interpretation. Tectonophysics, 7, 277–307.CrossRefGoogle Scholar
Taylor, S. R., 1967. The origin and growth of continents. Tectonophysics, 4, 17–34.CrossRefGoogle Scholar
Taylor, S. R. & White, A. J. R., 1966. Trace element abundances in andesites. Bull. Volcanol., 29, 177–194.CrossRefGoogle Scholar
Taylor, S. R., Kaye, M., White, A. J. R., Duncan, A. R. & Ewart, A., 1969. Genetic significance of Co, Cr, Ni, Sc, V, contents of andesites. Geochim. Cosmochim. Acta. 33, 275–287.CrossRefGoogle Scholar
Tilley, C. E., 1950. Some aspects of magmatic evolution. Q. Jl geol. Soc. Lond., 106, 37–61.CrossRefGoogle Scholar
Turner, F. J. & Verhoogen, J., 1960. Igneous and metamorphic petrology. McGraw-Hill, New York.Google Scholar
Wright, A. E., 1969. The Pre-Cambrian rocks of England, Wales and south-east Ireland. In Proceedings of the Gander Conference, Sept., 1967, Mem. Am. Ass. Petrol. Geol. 12.Google Scholar
Wright, A. E., 1968. The Pre-Cambrian of south-east Eire. Geol. Mag., 105, 75–76.CrossRefGoogle Scholar