Hostname: page-component-78c5997874-fbnjt Total loading time: 0 Render date: 2024-11-07T21:21:34.107Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access Rights & Permissions [Opens in a new window]

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

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).

page 34 note 2 Niggli, P., Beitr. geol. Karte der Schweiz, 1912, Folge, N., Lief. 36, p. 1.Google Scholar

page 34 note 3 Woyno, T. J., Neues Jahrb. Min., 1911, Beilage-Band 33, p. 186.Google Scholar

page 34 note 4 Goldschmidt, V. M., Vid. Selsk. Skrifter, Kristiania, 1915, no. 10.Google Scholar

page 34 note 5 Ibid., 1911, no. 1.

page 34 note 6 Tilley, C. E., Quart. Journ. Geol. Soc. London, 1924, vol. 80, p. 22.CrossRefGoogle Scholar

page 34 note 7 Carstens, C. W., Norsk Geol. Tidsskr., 1922, vol. 7, p. 186.Google Scholar

page 35 note 1 Goldschmidt, V. M., Vid. Selsk. Skrifter, Kristinnia, 1920, no. 10.Google Scholar

page 35 note 2 Barrow, G., Quart. Journ. Geol. Soc. London, 1893, vol. 49, p. 330.CrossRefGoogle Scholar

page 35 note 3 Tilley, C. E., Geol. Mag., 1924, vol. 61, p. 167 CrossRefGoogle Scholar.

page 36 note 1 Barrow, G., Proc. Geol. Assoc. London, 1912, vol. 28, p. 268.CrossRefGoogle Scholar

page 39 note 1 Quart, . Journ. Geol. Soc. London, 1893, vol. 49, p. 355 Google Scholar; Bull, . U.S. Geol. Survey, 1910, no. 419, p. 286 Google Scholar; Jahrb, Neues. Min., 1912, vol. 1, p. 399 Google Scholar; H. Rosenbusch, ‘Elemente der Gesteinslehre,’ 4th edit, by A. Osann, 1922-1923, p. 587; Doelter, C., ‘Handbuch der Mineralchemie,’ 1915, vol. 2, part 2, p. 422 Google Scholar.

page 40 note 1 Tilley, C. E., Quart. Journ. Geol. Soc. London, 1925, vol. 81, p. 103 CrossRefGoogle Scholar.

page 40 note 2 Hallimond, A. F. (Min. Mag., 1924, vol. 20, p. 193 Google Scholar) and Grout, F. F. and Thiel, G. A. (Amer. Min., 1924, vol. 9, p. 228 Google Scholar) have pointed out the possible importance of stilpnomelane as a constituent of metamorphosed sediments, especially in relation to its optical similarity to biotite. Lack of knowledge of the constitution of groundmass ‘chlorites’ and ‘biotites’ prevents as yet any estimate of the role accorded to stilpnomelane in metamorphosed sediments.

page 41 note 1 Boeke, H. E., Neues Jahrb. Min., 1916, vol. 1, p. 83.Google Scholar

page 41 note 2 Quart. Journ. Geol. Soe. London, 1893, vol. 49, p. 355; Nyt Mag. Naturv. 1886, vol. 30, p. 818; Mitt. Thurg. Naturf. Gesell., 1888, vol. 8, p. 13; H. Rosenbusch, ‘ Elem«nte der Gesteinslehre,’ 4th edit, by A. Osann, 1922-1923, p. 655; Zeits. Krist., 1923, vol. 57, p. 416; C. Boelter, ‘ Handbuch der Mineralchemie,’ 1916, vol. 2, part 2, p. 696.

page 42 note 1 Renard, A., Bull. Mus Roy. Hist. Nat. Belg., 1882, vol. 1, p. 10 Google Scholar.

page 43 note 1 Hintze, C., ‘Handbuch der Mineralogie,’ 1897, vol. 2, p. 728 Google Scholar; Heddle, M. F., ‘Mineralogy of Scotland,’ 1901, vol. 2, p. 125 Google Scholar; H. Rosenbuscli, ‘Elemente del- Gesteinslehre,’ 4th edit, by A. Osann, 1922-1923, p. 587; Neues Jahrb. Min., 1897, vol. 2, pp. 156, 215; Amer. Soarn. Sci., 1886, ser. S, vol. 32, p. 307.

page 44 note 1 Dana, ‘System of Mineralogy,’ 1892, p. 448; Doelter, C., ‘ Hantfbuch der Mineralehemie,’ 1921, vol. 2, part 8, pp. 365, 306.Google Scholar

page 45 note 1 van Hise, C. R., Monograph U.S. Geol. Survey, 1904, no. 47. p. 328 Google Scholar.

page 45 note 2 Tilley, C. E., Geol. Mag., 1925, vol. 62, p. 318.Google Scholar