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Initial melting in alkali feldspar-plagioclase-quartz systems

Published online by Cambridge University Press:  01 May 2009

Daniel F. Weill  and
Albert H. Kudo
Daniel F. Weill
Affiliation:
Centre for Volcanology, University of Oregon, Eugene, Oregon 97403, U.S.A.
Albert H. Kudo
Affiliation:
Dept. of Geology, University of New Mexico, Albuquerque, New Mexico 87106, U.S.A.
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Summary

The beginning of melting of mineral assemblages of alkali feldspar, plagioclase and quartz in the system Ab-Or-Q-An cannot be treated in terms of eutectic points in subsystems which are defined on the basis of the ratio Ab/ An. Such subsystems do not exhibit unique melting temperatures or unique compositions of the first liquid produced. It is shown theoretically and demonstrated experimentally that these three minerals may coexist with liquid over a considerable portion of the melting range.

Type
Articles
Information
Geological Magazine , Volume 105 , Issue 4 , August 1968 , pp. 325 - 337
Copyright
Copyright © Cambridge University Press 1968

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References

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