A Fabric Study of some Moine Schists and Associated Rocks

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Abstract
The science of Gefügekunde , variously translated as petrofabrics, petrotectonics, or structural petrology, is understood to comprise a study of all the spatial data, macroscopic and microscopic, which go to form a complete vector-picture so far as this is legible in the make-up of the rock. This conception of a fabric thus covers both texture and structure, and is an extended usage compared with that of the C.I.P.W. classification (Fairbairn 1935a, p. 4). A complete fabric study involves as an essential preliminary a study in the field of the macroscopic fabric—joint-planes, schistosity, and similar features—but the subsequent microscopic analysis of the grain-fabric provides a basis on which these features may be evaluated. The early analyses were laboriously carried out with the help of a gypsum plate, and detailed optical study dates from Schmidt's first attempt (Schmidt 1925) to put into practice a suggestion by Becke (1924, p. 207) that such optical analyses might conveniently be carried out with the help of the universal stage. Schmidt's paper gives a clear description of the procedure, which is also fully described by Sander (1930, pp. 118–30). Many later papers in English begin with a short account of the methods (Pabst 1931, pp. 60–3; Gilluly 1934, pp. 185–8), and a full account is given by Fairbairn (1935a, pp. 9–25). The value of such fabric analyses is threefold. First, from a purely petrographic view-point, they enable one to give a more complete description of a rock—"it is a totally different thing to talk about a granite

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