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On the occurrence of metamorphic minerals in calcareous rocks in the Bodmin and Camelford areas, Cornwall1

Published online by Cambridge University Press:  14 March 2018

G. Barrow  and
H. H. Thomas
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Extract

Cornwall has long been famous for the occurrence of certain minerals, found in the neighbourhood of the great granitic intrusions, that are rare in, or absent from, the aureoles of metamorphism surrounding the granites of many other regions. It is now generally recognized that these minerals have been produced by the action of certain heated gases on the rocks they penetrate along cracks and fissures ; but the exact age of this type of alteration is not so well known. It is often held to be contemporaneous with the thermo-metamorphism produced by the granite, and rocks Containing these minerals are included in the description of the ‘contact rocks’ surrounding the granite.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 15 , Issue 69 , November 1908 , pp. 113 - 123
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1908

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Footnotes

1

Communicated by permission of the Director of H.M. Geological Survey.

References

Page 117 note 1 Geology of Newquay (sheet 346). Mem. Geol. Surv., 1906, p. 27.

Page 117 note 2 Busz, K., Neues Jahrb. Min., 1899, Beil.-Bd. xiii, p. 128 Google Scholar

Page 118 note 1 A qualitative analysis of the garnetiferous portion of the Tregullan calcflintas showed the presence of the rare earths, but it was found impossible to prove to which mineral they belonged. It was at first thought that they might be present in the epidote in the form of orthite, but it is quite likely that they may be contained in the bright yellow garnet.

Page 118 note 2 Carne, J., Proc. Geol. Soc. Cornwall, 1822, vol, ii, p. 309.Google Scholar

Page 119 note 1 K. Busz, loc. cit., 1899, p. 125.

Page 119 note 2 Solly, R. H., Min. Mag., 1886, vol. vi, p. 202.CrossRefGoogle Scholar

Page 120 note 1 R. H. Solly, loc. cit., 1886, pp. 210-211.

Page 120 note 2 Weinschenk, E., Zeits. Kryst. Min., 1903, vol. xxxvii, p. 442.Google Scholar

Page 122 note 1 Lacroix, A., ‘Minéralogie de la France.’ 1893, vol. i, p. 168 Google Scholar.

Page 122 note 2 Thomas, H. H., Min. Mag., 1906, vol. xiv, p. 112 Google Scholar.