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Outgrowths on Zircon from Southern Rhodesia

Published online by Cambridge University Press:  01 May 2009

Geoffrey Bond
Geoffrey Bond
Affiliation:
National Museum of Southern Rhodesia
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Extract

The occurrence of what is probably clear secondary zircon on detrital grains of this mineral seems first to have been noticed by Butterfield (1936), in heavy residues from the Millstone Grit of Yorkshire. He showed that the outgrowths were too sharp and delicate to have withstood transport, and were, therefore, formed after the deposition of the rock. He also gave some account of their frequency and mode of occurrence in relation to the crystals to which they were attached. Smithson (1937) found similar outgrowths on zircons from the Middle Jurassic of Yorkshire, remarking that until we know of other occurrences it may be unwise to generalize, but that Butterfield's Millstone Grit zircons and his own Jurassic examples occurred in deposits which were either deltaic in origin, or closely associated with deltaic conditions.

Type
Articles
Information
Geological Magazine , Volume 85 , Issue 1 , February 1948 , pp. 35 - 40
Copyright
Copyright © Cambridge University Press 1948

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References

REFERENCES

(1) Bond, G., 1943. Solution Etching of Detrital Staurolite. Geol. Mag., lxxx, 155–6.Google Scholar
(2) Butterfield, J. A., 1936. Outgrowths on Zircon. Geol. Mag., lxxiii, 511–516.Google Scholar
(3) Lightfoot, B., 1929. The Geology of the Central Part of the Wankie Coalfield. Bull. Geol. Surv. Southern Rhodesia, No. 15.Google Scholar
(4) Smithson, F., 1937. Outgrowths of Zircon in the Middle Jurassic of Yorkshire. Geol. Mag., lxxiv, 281–3.CrossRefGoogle Scholar
(5) Smithson, F., 1941. The Alteration of Detrital Minerals in the Mesozoic Rocks of Yorkshire. Geol. Mag., lxxviii, 97–112.Google Scholar