Hostname: page-component-77c89778f8-swr86 Total loading time: 0 Render date: 2024-07-18T12:32:12.910Z Has data issue: false hasContentIssue false
  • English
  • Français

The Mode of Occurrence of Sillimanite in the Glen District, Co. Donegal

Published online by Cambridge University Press:  01 May 2009

C. F. Tozer
C. F. Tozer
Affiliation:
Geology Department. Imperial College, London, S.W.7.
Get access Rights & Permissions [Opens in a new window]

Abstract

Sillimanite produced by the contact action of the Donegal Granite shows varied textural and time relationships with the other minerals of the schists in which it occurs. Early Sillimanite was formed in the main stage of metamorphism by destruction of biotite, K, Fe, and Mg being expelled in the process. A later influx of new K from the granite led to the growth of muscovite metacrysts. This was associated with destruction of part of the early Sillimanite, recrystallization of part, growth of a new crop of Sillimanite needles, and formation of muscovite-sillimanite intergrowths.

Type
Articles
Information
Geological Magazine , Volume 92 , Issue 4 , August 1955 , pp. 310 - 320
Copyright
Copyright © Cambridge University Press 1955

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

Billings, M. P., 1938. Introduction of potash during regional metamorphism in New Hampshire. Geol. Soc. Amer. Bull., xlix, 289–302.CrossRefGoogle Scholar
Hall, A. L., 1909. Über die Kontactmetamorphose an dem Transvaal System. Tschermaks Min. Petr. Mitt., xxviii, 115.CrossRefGoogle Scholar
Hall, A. L., and Molengraaf, G. A. F., 1925. The Vredefort Mountain Land in South Transvaal and Orange River Free State. Uitgave van de Koninklijke Akademie van Wetenschappen, Amsterdam.Google Scholar
Harker, A., 1932. Metamorphism. Methuen. London.Google Scholar
Iyengar, S. V. P., Pitcher, W. S., and Read, H. H., 1954. The plutonic history of the Maas area, Co. Donegal. Quart. Journ. Geol. Soc., cx, 224.Google Scholar
Sanders, L. D., 1954. The status of sillimanite as an index of metamorphic grade in the Kenya Basement System. Geol. Mag., xci, 148.Google Scholar
Tattam, C. M., 1929. The metamorphic rocks of north-west Victoria. Geol. Surv. Victoria Bull., lii.Google Scholar
Turner, F. J., 1933. The metamorphic and intrusive rocks of southern Westland. New Zealand Inst. Trans., lxiii, 178–284.Google Scholar
Watson, J., 1949. Late sillimanite in the migmatites of Kildonan. Geol Mag., lxxxv, 149–162.Google Scholar
Weiss, J. V., 1949. Wissahickon schist at Philadelphia, Pennsylvania. Geol. Soc. Amer. Bull., xl, 1689–1726CrossRefGoogle Scholar
Williams, G. J., 1934. A granite-schist contact in Stewart Island, New Zealand. Quart. Journ. Geol. Soc., xc, 322–353.CrossRefGoogle Scholar
Wyckoff, D., 1952. Metamorphic Facies in the Wissahickon schist near Philadelphia, Pennsylvania. Geol. Soc. Amer. Bull., lxiii, 25–58.CrossRefGoogle Scholar