The evolution of quartz fabrics in the metamorphic rocks of central Perthshire

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Abstract
Structural and metamorphic studies in the Moinian and Dalradian rocks between Pitlochry and Kinloch Rannoch (Perthshire) have led to an investigation of the behaviour of quartz in response to regional metamorphism. The tectonic structures of the area indicate that the rocks have been subjected to three episodes of folding. Textural analysis by means of thin sections has led to the establishment of a sequence of mineral transformations which can be related to the tectonism which affected the rocks of the area. Investigations with the Universal Stage—in part involving the A.V.A. method—of specimens of diverse lithological types have indicated the relationships between the orientated quartz fabrics and megascopic structures encountered in the field. Various types of quartz girdles and maxima have been identified. Changes resulting from the working of metals described by metallurgists are suggested to have a parallelism in the changes observed in rock fabrics during regional metamorphism, and this has led the authors to propose a new theory for the orientation of quartz in tectonites.

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