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Some mineralogical transformations in crystalline schists

Published online by Cambridge University Press:  14 March 2018

C. E. Tilley
C. E. Tilley*
Affiliation:
Sedgwick Museum, Cambridge
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Extract

The twofold division of metamorphic rock-series into (a) Isophysical rock-series and (b) Isochemical rock-series, as proposed by P. Niggli in his paper, 'Die Gesteinsassoziationen und ihre Entstehung', introduces into metamorphic petrology two very useful terms, which will be of service in the metamorphic researches that await the attention of the petrologist.

Among such investigated rock-series one may call to mind the studies on the chloritoid-schists of the St. Gotthard massif," the glaucophaneschist suite of the Bagne valley (Wallis), the calc-silicate series of the Trondhjem region, the contact rocks of the Kristiania and Comrie areas. Of these the last are particularly illustrative of an isophysical rock-series, wherein a chemically wide group of assemblages conforming to the composition of shale-limestone sediments is represented in the free-silica and quartzless hornfelses.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 21 , Issue 113 , June 1926 , pp. 34 - 46
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1926

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References

page 34 note 1 P. Niggli, Verhandl. Schweiz. Naturf. Gesell., 1921, 101 Jahresvers. for 1920 in Neuenburg, part 2, pp. 123-147. [Min. Abstr., vol. 2, p. 315.] These terms are further defined and described in TJ. Grubenmann and P. Niggli, ‘Die Gesteinsmetamorphose,’ 1924, part I, pp. 481-484. Isophysical is synonymous with isogiade or isofaeiel used in conjunction with isograd, in treating metamorphism from the standpoint of the facies classification (Geol. Mag., 1924, vol. 61, p. 167).

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