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Porphyroblastic and Augen Gneisses in the Bartica Assemblage, British Guiana

Published online by Cambridge University Press:  01 May 2009

R. T. Cannon
R. T. Cannon
Affiliation:
Geological Survey Department, P.O. Box 789, Georgetown, British Guiana.
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Abstract

Textural differences in the occurrence of microcline define augen gneisses, subhedral porphyroblastic gneisses and euhedral porphyroblastic gneisses within the Bartica Assemblage, British Guiana. The introduction of microcline is metasomatic and the nature of the porphyroblasts appears to be a reflection of tectonic control during their development.

Type
Articles
Information
Geological Magazine , Volume 101 , Issue 6 , 30 December 1964 , pp. 541 - 547
Copyright
Copyright © Cambridge University Press 1964

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References

REFERENCES

Cannon, R. T., 1962. The Gneisses of the Bartica Assemblage, British Guiana. Geol. Mag., 99, 164–172.CrossRefGoogle Scholar
Cannon, R. T., 1964. The Geology of the Bartica Assemblage. Bull. geol. Surv. Brit. Guiana, 35, 83 pp.Google Scholar
Eskola, P., 1956. Postmagmatic Potash Metasomatism of Granite. Bull. Comm. Geol. Finl., 172, 85–100.Google Scholar
Goldsmith, J. R., and Laves, F., 1954. The Microcline-Sanidine Stability Relations. Geochim. et Cosmochim. Acta, 5, 1–19.CrossRefGoogle Scholar
Harry, W. T., 1952. The Migmatites and Felspar-Porphyroblast Rock of Glen Dessarry, Inverness-Shire. Quart. J. geol. Soc. Lond., 107, 137–158.Google Scholar
Heier, K. S., 1957. Phase Relations of Potash Feldspar in Metamorphism. J. Geol., 65, 468–479.CrossRefGoogle Scholar
Marmo, V., 1956. On the Emplacement of Granites. Amer. J. Sci., 254 479–492.CrossRefGoogle Scholar