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The Granite Problem: Evidence from the Quartz and Feldspar of a Tertiary Granite

Published online by Cambridge University Press:  01 May 2009

O. F. Tuttle  and
M. L. Keith
O. F. Tuttle
Affiliation:
Geophysical Laboratory, Carnegie Institution of Washington, Washington, D.C.
M. L. Keith
Affiliation:
Department of Earth Sciences, Pennsylvania State University, State College, Pennsylvania.
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Abstract

The inversion temperatures of the quartz from twenty-five specimens of the Beinn an Dubhaich granite have been measured and found to correspond to the inversion temperatures of quartz from rhyolites previously studied. Optical and X-ray studies of the alkali and plagioclase feldspars indicate high temperature modifications. The Beinn an Dubhaich granite has the textural and compositional features of a granite together with mineralogical features normally associated with rhyolitic rocks. The results serve to emphasize that methods are now available which make it possible in some cases to determine whether a particular granite was formed by metamorphism of sediments or by crystallization of a magma. It is concluded that the older granites and those which crystallized at greater depths probably have undergone considerable rearrangement of their mineralogical and textural features subsequent to primary crystallization.

Type
Articles
Information
Geological Magazine , Volume 91 , Issue 1 , February 1954 , pp. 61 - 72
Copyright
Copyright © Cambridge University Press 1954

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References

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