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The Pegmatites of Trolvis Quarry, Carnmenellis, Cornwall

Published online by Cambridge University Press:  01 May 2009

K. F. G. Hosking
K. F. G. Hosking
Affiliation:
Camborne School of Metalliferous Mining, Cornwall.
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Abstract

The pegmatites of Trolvis Quarry, Carnmenellis, are small lenticular masses which were developed before the joints of the associated granite. Both mineralogically simple and complex types occur: the latter are drusy. Whilst the earlier minerals lining the druses may have crystallized in a closed system, the later minerals were clearly deposited from a moving phase. The disposition of the later minerals was largely determined by earlier crystals acting as baffles to the mineral-depositing agents. The pegmatites appear to occupy spaces formed by the solution of the granite by a pegmatitic fraction of the magma.

Type
Articles
Information
Geological Magazine , Volume 91 , Issue 4 , August 1954 , pp. 273 - 285
Copyright
Copyright © Cambridge University Press 1954

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References

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