Hostname: page-component-586b7cd67f-t7czq Total loading time: 0 Render date: 2024-11-25T08:06:47.576Z Has data issue: false hasContentIssue false
  • English
  • Français

The Term “Crinanite”

Published online by Cambridge University Press:  01 May 2009

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

Extract

The name crinanite was given in 1911 by Sir John Flett to a suite of N.W. analcite-dolerite dykes occurring in a fairly extensive district in Argyllshire of which Loch Crinan is the centre. A description of the type is accompanied by an analysis and a photomicrograph of a characteristic example from the island of Jura. Writing a few months later of similar dykes in Colonsay, the same author gives a concise definition of the type—“The crinanites, then, are dark coloured, fine-grained, basic rocks consisting mainly of olivine, augite, and plagioclase felspar, with a considerable amount of analoite and zeolites.” A detailed description follows, in which the very perfect ophitic structure of the rocks is emphasized, and another excellent photomicrograph is shown of an example from Colonsay. In his original description Sir John Flett states that the crinanites “present some analogies to the teschenites in mineral composition; from the latter they are distinguished by their finer grain, their perfect ophitic structure, the scarcity of hornblende and biotite, and their occurrence as thin vertical parallel dykes”.

Type
Original Articles
Information
Geological Magazine , Volume 71 , Issue 3 , March 1934 , pp. 122 - 128
Copyright
Copyright © Cambridge University Press 1934

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 122 note 1 “The Geology of Knapdale, Jura, and N. Kintyre,” Mem. Geol. Surv., 1911, 116, plate 5, fig. v.Google Scholar

page 123 note 1 “The Geology of Colonsay and Oronsay,” Mem. Geol. Surv., 1911, 42, plate 6, fig. iv.Google Scholar

page 123 note 2 Tyrrell, G. W., Geol. Mag., 1913, 308.Google Scholar

page 123 note 3 “The Geology of N. Arran,” Mem. Geol. Surv., 1903, 112.Google Scholar

page 123 note 4 Holmes, A., The Nomenclature of Petrology, 1920, 71.Google Scholar

page 124 note 1 Walker, F., Geol. Mag., LX, 1923, 242.CrossRefGoogle Scholar

page 124 note 2 G. W. Tyrrell, Ibid, 249.

page 124 note 3 Walker, F., Geol. Mag., LXIII, 1926, 347.Google Scholar

page 124 note 4 Tyrrell, G. W., “The Geology of Arran,” Mem. Geol. Surv., 1928, 119.Google Scholar

page 124 note 5 Scott, A., “The Geology of Stoke-upon-Trent,” Mem. Geol. Surv., 1928, 94, plate ii.Google Scholar

page 124 note 6 Tyrrell, G. W., Quart. Journ. Geol. Soc., lxxxiv, 1928, 540.CrossRefGoogle Scholar

page 125 note 1 Smith, W. Campbell and Chubb, L. J., Quart. Journ. Geol. Soc., lxxxiii, 1927, 322.Google Scholar

page 127 note 1 Walker, F., “The Dolerite Isles of the N. Mineh,” Trans. Roy. Soc. Edin., lvii, 1931, 759.Google Scholar

page 127 note 2 Includes a considerable proportion of indeterminable mesostasis.

page 128 note 1 Dr. Balsillie, , Geol. Mag., LXIX, 1922, 444.Google Scholar

page 128 note 2 Jehu, T. J. and Craig, R. M., Trans. Roy. Soc. Edin., liii, 1923, 437.Google Scholar