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Some mineralogical and chemical changes induced by progressive metamorphism in the Green Bed group of the Scottish Dalradian

Published online by Cambridge University Press:  14 March 2018

F. Coles Phillips
F. Coles Phillips*
Affiliation:
Corpus Christi College, Cambridge
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Extract

The petrology of the igneous rocks has for the last quarter of a century been established,on a sound quantitative basis, largely as a result of the body of experimental work available on silicate melts. In the field of metamorphism, however, progress has been much less marked, and the difficulties of the laboratory development of stresses comparable with those acting during regional metamorphism must for some time leave our knowledge of the crystalline schists far behind that even of the hornfelses. A quantitative approach, however, is not confined to the experimental side. The introduction of the conceptions of facies and grade raises a new need for exact knowledge of the compositions of the various minerals, both of those constituting the different isophysical assemblages of a given grade, and of the isochemical assemblages representing a given rock under the grade-conditions of the various facies established.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 22 , Issue 129 , June 1930 , pp. 239 - 256
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1930

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