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Crystal Size Frequency Distribution of Garnets in Some Analysed Metamorphic Rocks from Mallaig, Inverness, Scotland

Published online by Cambridge University Press:  01 May 2009

A. K. Galwey  and
K. A. Jones
A. K. Galwey
Affiliation:
Dept. of Chemistry, Queen's University, Belfast 9, Northern Ireland.
K. A. Jones
Affiliation:
Dept. of Geology, Queen's University, Belfast 9, Northern Ireland.
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Abstract

In an attempt to obtain information about garnet nucleation a series of eleven apparently homogeneous metamorphic rocks, from a small area near Mallaig, Inverness, Scotland, have been analysed to determine bulk chemical and modal compositions, garnet grain size and number of garnet crystals occurring in unit volume of rock (N). No correlation of N with any function of chemical and modal compositions could be found, and it is therefore concluded that, if the influence of trace components can be neglected, externally imposed factors (for example, time-temperature variation) or internal physical factors (for example, the surface area of the rock just prior to garnet formation) must exert a controlling influence on garnet nucleation. It was found, however, that in each specimen, there was a preferred crystal radius and the relative frequency of occurrence about this preferred value was constant for all samples studied. Preliminary comparison with other systems, investigated by the authors, suggested that the nature of this relationship may provide evidence of the conditions under which these rocks recrystallized.

Type
Articles
Information
Geological Magazine , Volume 103 , Issue 2 , April 1966 , pp. 143 - 152
Copyright
Copyright © Cambridge University Press 1966

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References

REFERENCES

Chinner, G. A., 1960. Pelitic Gneisses with varying Ferrous/Ferric Ratios from Glen Clova, Angus, Scotland. J. Pet., 1, 178–217.CrossRefGoogle Scholar
Eskola, P., 1915. On the relation between chemical and mineralogical composition in the metamorphic rocks of the Orijärvi region. Bull. comm. géol. Finlande, No. 44.Google Scholar
Galwey, A K., and Jones, K. A., 1963. An attempt to determine the mechanism of a natural mineral-forming reaction from examination of the products. J. Chem. Soc., pp. 5681–5686.CrossRefGoogle Scholar
Groves, A. N., 1951. Silicate Analysis. Allen and Unwin, London.CrossRefGoogle Scholar
Hull, F. C., and Houk, W. J., 1953. Statistical grain structure studies: Plane distribution curves of regular Polyhedrons. J. Metals, 195, 565–572.Google Scholar
Jones, K. A., and Galwey, A. K., 1964. A study of possible factors concerning garnet formation in rocks from Ardara, Co. Donegal, Ireland. Geol. Mag., 101, 76–93.CrossRefGoogle Scholar
Kennedy, W. Q., 1955. The Tectonics of the Morar anticline and the problem of the North-West Caledonian Front. Quart. J. geol. Soc. Lond., 110, 357–390.CrossRefGoogle Scholar
Korzhinskii, D. S., 1959. Physicochemical basis of the analysis of the paragenesis of minerals. Consultants Bureau, New York.Google Scholar
Lambert, R. St. J., 1959. The mineralogy and metamorphism of the Moine schists of the Morar and Knoydart Districts of Inverness-shire. Trans. roy. Soc. Edin., 63, 553–88.CrossRefGoogle Scholar
Ramberg, H., 1952. The origin of metamorphic and metasomatic rocks Chicago: The University Press.Google Scholar
Winchell, A. N., 1945. Elements of Optical Mineralogy. John Wiley, New York.Google Scholar